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ELEMENT14 ESSENTIALS: TOOLS & TEST EQUIPMENT III
Version 2
Erstellt von pchan am 21.08.2021 03:42. Zuletzt geändert von pchan am 27.08.2021
17:15.
element14 Learning Center
Tools & Test Equipment III: Optical Spectrometers
Sponsored by
--------------------------------------------------------------------------------
1. Introduction | 2. Objectives | 3.Scope | 4. Basic Concepts | 5. Analysis |
Related Components | Test Your Knowledge
Also Available:
Tools & Test Equipment I: RF Spectrum Analyzer
Tools & Test Equipment II: Source Measure Units
1. Introduction
Electromagnetic (EM) radiation consists of a broad spectrum of different
wavelengths of light, both visible and invisible to the human eye. This spectrum
can be analyzed using optical spectroscopy. An optical spectrometer breaks up
light into a higher number of bands, and these spectral components of light can
be used to analyze the characteristics of a wide range of materials.
Spectrometers are key test instruments in multiple fields, from industrial to
scientific research. They play crucial roles in several applications, including
Process Control and Monitoring, Environmental Quality Analysis, Medical
Diagnostics, Quality Control, Chemical Analysis, and Material and Polymer
Analysis. In this learning module, we discuss different kinds of spectrometers,
the basic concepts underlying the operation of an optical spectrometer, and
various use cases.
2. Objectives
Upon completion of this module, you will be able to:
Explain the different types of spectrometers
Understand the basic concepts and workings of an optical spectrometer
Discuss Broadcom’s Q-series (Qwave, Qmini, Qneo) spectrometers
Discuss applications using spectrometers
3.Scope
Back to Top
A spectrometer is an instrument that measures the variance of physical
characteristics over a provided spectrum range. For example, a mass spectrometer
measures the mass-to-charge ratio spectrum, and an NMR spectrometer measures the
contrast of nuclear resonant frequencies.
One common application for spectrometers is analyzing food and agricultural
samples. Near-infrared (NIR) spectrometers use light at NIR wavelengths to
penetrate food samples, allowing the analysis of the composition inside the
sample without causing any damage.
Different types of spectrometers are available, with common ones being optical
spectrometers, nuclear magnetic resonance (NMR) spectrometers, and mass
spectrometers. Optical spectrometers measure the characteristics of light and
materials identified through variation in light intensity absorption and
emission, along with wavelength. NMR spectrometers observe and evaluate the
interplay of nuclei spins of a sample placed in a strong, sustained magnetic
field. Mass spectrometers measure the mass-to-charge ratio of one or more
molecules present in a sample and identify its composition of elements. Mass
spectrometers have an ionization source that produces ions from the sample
chemical substance under analysis, after which molecular weight can be
determined using electric and magnetic fields.
The scope of this learning module is limited to optical spectrometers, the
different types, their working principles, and Broadcom Q-series spectrometers,
including Qwave, Qmini, and Qneo, along with their use case applications.
4. Basic Concepts
Back to Top
An optical spectrometer measures a sample's intensity of absorption, scattering,
reflection, or emission of radiation in the spectrum's ultraviolet, infrared, or
visible region (as illustrated in Figure 1). Materials in the sample can be
recognized with changes in the absorption and emission of the light intensity at
different wavelengths. All optical spectrometers share a common aspect: a
wavelength selection mechanism.
Click below to enlarge image:
Figure 1: Electromagnetic Spectrum
Figure 2A illustrates the technological process of the optical spectrometer.
Light enters through a narrow entrance slit. The slit size limits the amount of
light to be measured and influences the spectrometer's optical resolution; a
smaller slit size equals better resolution. The beam starts to spread, or
becomes divergent, after it proceeds through the slit. A first mirror is used to
collimate the beam, or to make the beam’s rays parallel. The collimated rays are
then directed towards a grating, which separates the light into different
wavelengths.
Figure 2A: The inside / technology of the optical spectrometer.
Figure 2B & C: Spectrometer measurement set up
A diffraction grating separates different wavelengths of light by reflecting
them at different angles. The light reflected off the diffraction grating
becomes divergent once again, and must be collimated, again using a collimating
mirror. The collimated rays are then directed towards a detector, which measures
the intensity of light for each of the wavelengths. The resulting data can be
uploaded to a computer for further analysis. Contemporary spectrometer systems
interact with computers via USB, Ethernet, or RS-232RS-232. Technological
advances have enabled newer systems to transfer data wirelessly, via Bluetooth
and Wi-Fi.
- 4.1 Optical Spectrometer Types
Wavelength
Ultraviolet (UV) Spectrometers
A UV spectrometer measures light absorption spanning the electromagnetic
spectrum's ultraviolet range (between 180-400 nm) to determine the composition
of the sample. The molecules in the sample absorb the energy from the UV light,
exciting their electrons. The level of excitement is proportional to the
wavelengths that each type of molecule can absorb, and these levels are used to
determine the types of molecules present in the sample. A standard UV
Spectrometer typically uses a deuterium arc, tungsten halogen, or xenon arc lamp
as a light source. The detector can be a PMT, CCD, photodiode, or photodiode
array. UV spectroscopy is employed by analytical chemists for quantitative
diagnosis of different analytes, like transition metal ions, biological
macromolecules, and highly conjugated organic compounds.
Visible (VIS) Spectrometers
A VIS spectrometer works in a similar fashion as a UV spectrometer; however,
light in the electromagnetic spectrum's visible region (380-750 nm) is used
instead. VIS and UV spectrometers share common applications and, by extension,
industries as well. Many spectrometers are UV-VIS spectrometers, which cover
both spectrums.
Near Infrared and Infrared (NIR & IR) Spectrometers
Near infrared and infrared spectrometers use infrared (750 nm to 1 mm) radiation
to induce vibrations in the molecules of a sample. Because different molecules
absorb specific frequencies that are characteristic of their structure,
measuring the absorption of the sample for a range of wavelengths can
successfully identify its chemical composition. NIR & IR spectrometers are used
in various applications such as protein characterization, nanoscale
semiconductor analysis, space exploration, and compound identification.
Light Interaction
Spectrometers work on different principles, taking advantage of the behavior of
light in order to make their measurements. These are some examples of how
spectrometers function.
Absorption Spectrometers
Absorption spectrometers measure the radiation absorption of a given sample. In
any sample, the absorption intensity changes with the frequency of the light,
and this variation is used to generate an absorption spectrum. The absorption
spectrum is effective at determining the concentration of compounds present
within a sample. Absorption spectrometers are found in remote sensing, atomic
and molecular physics, and astronomy. The UV, VIS, and NIR spectrometers
previously discussed have been described as absorption spectrometers.
Reflectance Spectrometers
Figure 3: The operating principle of reflectance spectrometers
Reflectance spectrometers measure the quantity of scattered or reflected light
from a sample. Figure 3 illustrates the scattering of light reflected from or
passing through a sample after it has arrived from the light source. A detector,
usually a CCD or photodiode, measures the light reflected throughout the
spectrum, enabling a reflectance versus wavelength plot to be generated.
Reflectance spectrometers are widely used in the medical industry to offer
information related to tissue concentration. They are also used in environmental
science and geology.
Transmittance Spectrometers
Figure 4: The operating principles of transmittance spectrometers
Transmittance spectrometers measure the amount of light that a sample lets flow
through it unaffected. Figure 4 illustrates the typical setup of a transmittance
spectrometer. The wavelengths where the sample absorbs the least will have the
highest amount of transmission, and vice versa. Transmittance spectrometers are
frequently used in pharmaceutical analysis.
Scattering Spectrometers
Scattering spectrometers measure the amount of light that is scattered when it
passes through a sample. While most light continues on its original path when
passing through a material, some photons change course. This is caused by the
light’s energy exciting the vibrational modes of the molecules in the material,
and scattering it at a diminished energy level. This is known as Raman
Scattering or the Raman Effect. The vibrational change in the sample can be
analyzed to determine properties like chemical composition, crystallinity, and
molecular interactions. Scattering Spectrometers are commonly used in the
chemical and pharmaceutical industries, where they help with tasks such as
identifying molecules, investigating chemical bonding, and discovering
counterfeit drugs inside packages.
Raman Spectrometers
Raman spectrometers take advantage of the way light interacts with the chemical
bonds in a sample. A Raman spectrometer uses a filter designed to remove light
scattered by other methods (such as Rayleigh scattering) in order to limit the
measurements to Raman scattered light. The filtered light is then used to
generate the Raman spectrum of the sample. The light source in Raman
spectrometers is a continuous-wave laser. Raman spectrometers analyze the
material and produce data related to chemical structure, impurity,
contamination, phase and polymorphism, and intrinsic stress/strain.
- 4.2 Broadcom’s Optical Spectrometer Range
Broadcom’s range of compact modular spectrometer devices include the Qwave,
Qmini, and Qneo series for UV–VIS–NIR measurements ranging from 190 nm to 1700
nm. Based on the Czerny-Turner configuration, these spectrometers lack moving
parts, which avoids optical misalignment and ensures reliable and stable
long-term performance. All devices have good thermal stability and are
factory-calibrated. Broadcom spectrometers are used in applications such as
process control and monitoring, biomedical applications, chemical research,
environmental analysis, medical and pharma applications, forensic analysis, and
more.
Qwave Series: this series is fitted with a high-resolution 3648-pixel linear CCD
detector featuring optimal resolution down to 0.2 nm, a focal length of 75 mm, a
high dynamic range of up to 1500:1, and spectral coverage ranging from 220 to
1030 nm covered by three wavelengths configurations. The Qwave series can cope
with most setups, while maintaining a relatively small size of 89.5 × 68 × 19.5
mm. This series is intended for more critical spectral analysis, where the high
resolution and throughput of the spectrometer are required. AFBR-S20W2VI is a
good example from this series.
Qmini Series: The Qmini Series covers a wide spectral range, starting at 220 nm
up to 1100 nm. Its compact size (64 x 42 × 14.5 mm) allows it to be easily
integrated into space-constrained applications, making it an appropriate
solution for mobile analysis. Onboard processing capabilities save the
processing cycles of the host controller, making it possible to use them in IoT
setups or similar MCU or MPU-driven applications. Despite their size, these
spectrometers deliver a variety of functionalities and connectivity options
common to all Q-series spectrometers. AFBR-S20M2VI and AFBR-S20M2WU are some
examples from the Qmini series.
Qneo Series: The Qneo series is a pocket-sized NIR spectrometer designed for
sensitive measurements between 950 and 1700 nm. The compact form factor of 60 x
40 x 19 mm provides versatility in integrating the spectral sensor in a process
analyzing system (PAT) or handheld device for point-of-care diagnostics (POC).
The thermal stability of the electro-optical system is important to spectrometer
performance over the full temperature range -15°C to +55°C (5°F to 131°F). This
series features a spectral resolution of 8 nm [FWHM], integrated electronics
with full system calibration, and serial interfaces (USB, SPI, and UART). In
addition, they are equipped with an uncooled 256-pixel InGaAs array in an
ultra-compact design. AFBR-S20N1N256 is an example of this series.
- 4.3 Application Software
All Q-series spectrometers can be used with Broadcom’s complimentary Waves
Spectrometer software, which simplifies data acquisition and spectra evaluation.
This software features:
Capture and display series of spectra
Automatic exposure control with dark spectrum interpolation
Ability to import and export ASCII based files
Comprehensive tools for displaying and analyzing spectra
Strip charts for comparing characteristic values between multiple spectra,
including peak follower in real-time
Transmission, absorption, and reflection measurements
The Waves Software is a useful tool for evaluation. For OEM integration, a
software development kit (SDK) with several device commands is online to start
the implementation.
Figure 6: Waves Main Interface Window
5. Analysis
Back to Top
Optical spectrometers are used for material analysis in a wide variety of fields
in engineering and science. We will now analyze some specific optical
spectrometer use case applications.
Spectral Analysis of Water with the Qmini UV Spectrometer
Dissolved nitrate in water is difficult to detect without testing, as it is
odorless, tasteless, and colorless. Nitrate-nitrogen contaminated drinking water
causes harm when the nitrate changes into nitrite within the digestive system.
Nitrite causes the iron component of the RBC hemoglobin to oxidize, forming
methemoglobin. The latter cannot carry oxygen like hemoglobin and creates a
condition termed methemoglobinemia (aka "blue baby syndrome"), where oxygen
absence in the individual body cells causes the skin and veins to appear blue. A
lab water test for nitrate is essential for families with infants, nursing
mothers, pregnant women, or the elderly.
Ultraviolet-visible (UV-Vis) spectroscopy can effectively detect contaminant
quality and quantity in an aqueous environment. The Qmini UV (AFBR-S20M2UV) and
Qmini WIDE UV (AFBR-S20M2WU) spectrometers can be a good fit for online
detection of nitrite and nitrate content in waste and freshwater. They can also
effectively measure turbidity within the VIS range. The lower UV range (< 200
nm) absorbance spectroscopy determines the nitrite/nitrate concentration. The
Qmini spectrometer with adjusted starting wavelengths at approximately 189 nm
enables real-time monitoring in line and at the line without taking samples.
Figure 7: Detection of nitride and nitrate content in waste and fresh water
using the Qmini spectrometer
Detection of Pathogens in Food and Feed with the Qwave Spectrometer
Optical spectroscopy can also detect harmful pathogens contaminating food and
feed in a processing line. Spectroscopy is very effective in the bioanalysis of
samples, and can perform this analysis without destroying the sample. With
absorbance spectroscopy, the Qwave AFBR-S20W2XX series spectrometer can detect
the existence and concentration of labeled pathogens. The Qmini WIDE (220 -1000
nm) can also be used, due to its broad spectral range and the fact that it
covers various measurement tasks with a single device in an analyzer system.
Figure 8: Detection of pathogens in food and feed using Qwave or Qmini
spectrometers
Environmental Analysis with Qneo Spectrometer
The spectral analysis of environmental and geological irradiance is a
spectrometer application where optical spectrometers are used to identify
spectrally and physically distinctive features of different surface materials
and rock types. Environmental analysis includes environmental moisture, solar
radiation, and temperature. Qneo NIR (AFBR-S20N1N256) and Qmini (AFBR-S20M2XX)
spectrometers are ideal for such applications, because they can measure the
amplitude and wavelengths of light emitted in the near-infrared and visible
range, and are easily integrated into handheld solutions. Broadcom provides the
SDK that guides communication with the spectrometer using various digital
interfaces, programming languages for software development, and facilitates
communication with embedded microcontrollers.
Figure 9: Spectrometer in geological and environmental applications using Qmini
or Qneo spectrometers
Charge Coupled Device (CCD): a light sensitive integrated circuit capable of
converting light into electronic data.
Diffraction Grating: a type of monochromator that separates light into a range
of individual wavelengths, using a number of parallel, closely spaced slits.
Electromagnetic (EM) Radiation: a form of energy traveling in waves at the
speed of light, spanning a broad spectrum.
Infrared (IR): the range of frequencies of radiant energy or light invisible to
the human eye, but able to be felt as heat. Infrared is divided into 3 spectral
regions: near-infrared (750 – 1300 nm), mid-infrared (1300 – 3000 nm), and
far-infrared (3000 – 1mm).
Monochromator: an optical device that separates light into a range of
individual wavelengths. Examples of monochromators are prisms and diffraction
grating.
Nuclear Magnetic Resonance (NMR): a phenomenon where molecules react to a
magnetic field by producing an electromagnetic signal with a frequency
characteristic of the magnetic field at its nucleus.
Photon Multiplier Tube (PMT): a type of vacuum tube capable of detecting light
in the UV, visible, and near-infrared ranges of the electromagnetic spectrum.
Serial Peripheral Interface (SPI): a synchronous communication interface for
short distance communication, typically used to send data between
microcontrollers and small peripherals.
Spectrometer: an optical instrument used to measure the variation of physical
characteristics over a frequency range in a given spectrum of light.
Visible (VIS): refers to the range of frequencies of light visible to the human
eye. The range starts at around 380 nm (violet) and extends to approximately 750
nm (red).
Ultraviolet (UV): the range of frequencies of radiant energy or light that
falls between the visible spectrum and X-rays. UV is generally divided into 3
spectral regions: UVA (315-400 nm), UVB (280-315 nm), and UVC (180-280 nm).
Universal Asynchronous Receiver/Transmitter (UART): a hardware communication
protocol that provides asynchronous communication between devices.
Universal Serial Bus (USB): an industry standard for connectors and
communication protocols, widely used for connecting peripherals to computers.
*Trademark. Broadcom is a trademark of Broadcom Inc. Other logos, product and/or
company names may be trademarks of their respective owners.
Related ComponentsBack to Top
The element14 ESSENTIALS of Optical Spectrometers discusses different kinds of
spectrometers, the basic concepts underlying the operation of optical
spectrometers, and various use cases. To extend the knowledge covered in the
main module, this supplementary guide discusses the types of Broadcom Q-Series
spectrometers.
Spectrometers
The Qneo AFBR-S20N1N256 Near NIR spectrometer is designed for industrial
integration. Equipped with an uncooled InGaAs sensor array, the Qneo enables
professional measurement between 950 nm and 1700 nm. On a footprint smaller than
a credit card, the Qneo features a rugged setup that combines high resistance in
industrial environments and high optical performance.
AFBR-S20N1N256, Spectrometer, 950 nm, 1700 nm, 8 nm, NIR, 40 mm, SMA Connector
Buy NowBuy Now
Wavelength range: 950-1700 nm
Spectral resolution (FWHM): 8nm
Dynamic Range: 12000:1
Detector: 256 pixel linear uncooled InGaAs sensor
Dimensions: 60.0 x 50.0 x 19.0 mm
This is a miniature USB spectrometer with on-board electronics and communication
interfaces for UV–VIS–NIR measurements. The Qmini spectrometer offers a small
design to enable tight integration to suit a large number of OEM requirements.
QMINI WIDE-UV Spectrometer, 225 nm, 1000 nm, 1.5 nm, CCD, 50 mm, SMA Connector
Buy NowBuy Now
Six wavelength configurations from 190 nm–1100 nm
Spectral resolution from 0.3–1.5 nm
Miniature size
Powerful on-board electronics with processing and evaluation
Customizable wavelength range, sensitivity, resolution and interfaces
Application software and Software Development Kit
Dimensions: 64.0 x 42.0 x 14.5 mm
Qmini AFBR-S20M2XX is a Miniature Spectrometer with Onboard Processing for
Mobile Applications and Industrial Integration. Its compact design enables tight
integration in applications where space is limited, like mobile analysis
devices. The Qmini includes a powerful electronics board that enables:
QMINI VIS, Spectrometer, 370 nm, 750 nm, 0.7 nm, CCD, 50 mm, SMA Connector
Buy NowBuy Now
Full processing of spectra in the device (offset, nonlinearity, dark spectrum,
and spectral sensitivity)
Averaging and smoothing
Binning and buffering of spectra
A replaceable entrance slit, reduced stray light, and lower power consumption.
Within a very small design, the Qmini delivers technical specifications that are
unprecedented at this size. Its compact design enables tight integration in
applications where space is limited, like mobile analysis devices. The Qmini
includes a powerful electronics board that enables:
QMINI UV, Spectrometer, 220 nm, 400 nm, 0.3 nm, CCD, 50 mm, SMA Connector
Buy NowBuy Now
Wavelength range: 220 nm to 400 nm
Spectral Resolution: 0.3 nm
Full processing of spectra in the device (offset, nonlinearity, dark spectrum,
and spectral sensitivity)
Averaging and smoothing
Binning and buffering of spectra
A replaceable entrance slit, reduced stray light, and lower power consumption.
Within a very small design, the Qmini delivers technical specifications that are
unprecedented at this size. Its compact design enables tight integration in
applications where space is limited, like mobile analysis devices. The Qmini
includes a powerful electronics board that enables:
QMINI NIR, Spectrometer, 730 nm, 1080 nm, 0.7 nm, CCD, 50 mm, SMA Connector
Buy NowBuy Now
Wavelength range: 730 nm to 1080 nm
Spectral Resolution: 0.7 nm
Full processing of spectra in the device (offset, nonlinearity, dark spectrum,
and spectral sensitivity)
Averaging and smoothing
Binning and buffering of spectra
A replaceable entrance slit, reduced stray light, and lower power consumption.
Spectrometer Accessory
AFBR-S20SK-V2, Test Equipment Kit, SMA 905 Connector, Hexagon Socket Screw Key
Buy NowBuy Now
AFBR-S20SK-V2 is a Slit Evaluation Kit for Broadcom spectrometers, simplifying
the spectrometer evaluation process with interchangeable slits. This kit enables
the quick changing of slit sizes when evaluating the spectral performance of
Qmini or Qwave in the field.
For more available products Shop Now
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Test Your KnowledgeBack to Top
Are you ready to demonstrate your knowledge of Optical Spectrometers? Then take
a quick 10-question quiz to see how much you've learned. To earn the Tools &
Test Equipment III Badge, read through the learning module, attain 100% on the
Quiz, leave us some feedback in the comments section, and give the learning
module a star rating.
1) TRUE OR FALSE: AN OPTICAL SPECTROMETER MEASURES A SAMPLE'S INTENSITY OF
ABSORPTION, SCATTERING, REFLECTION, OR EMISSION OF RADIATION IN THE SPECTRUM'S
ULTRAVIOLET, INFRARED, OR VISIBLE REGION.
True
False
2) A UV SPECTROMETER MEASURES LIGHT ABSORPTION SPANNING THE ELECTROMAGNETIC
SPECTRUM'S ULTRAVIOLET RANGE BETWEEN ________ NM TO DETERMINE THE COMPOSITION OF
THE SAMPLE.
50-100 nm
180-400 nm
750 nm to 1 mm
380-750 nm
None of the Above
3) TRUE OR FALSE: THE SLIT SIZE OF AN OPTICAL SPECTROMETER LIMITS THE AMOUNT OF
LIGHT TO BE MEASURED AND INFLUENCES THE SPECTROMETER'S OPTICAL RESOLUTION; A
LARGER SLIT SIZE EQUALS BETTER RESOLUTION.
True
False
4) A RAMAN SPECTROMETER USES A ___________ AS ITS LIGHT SOURCE.
Xenon arc lamp
Tungsten halogen lamp
Deuterium arc lamp
Continuous-wave laser
Mercury-vapor fluorescent lamp
5) TRUE OR FALSE: THE BROADCOM QNEO SERIES SPECTROMETER IS A POCKET-SIZE NIR
SPECTROMETER DESIGNED FOR SENSITIVE MEASUREMENTS BETWEEN 950 AND 1700 NM, AND IS
IDEAL FOR USE AS A HANDHELD DEVICE FOR POINT-OF-CARE (POC) DIAGNOSTICS.
True
False
6) THE BROADCOM QWAVE OPTICAL SPECTROMETER HAS A HIGH-RESOLUTION ________ PIXEL
LINEAR CCD DETECTOR AND FEATURES OPTIMAL RESOLUTION DOWN TO 0.2 NM, A FOCAL
LENGTH OF 75 MM, A HIGH DYNAMIC RANGE OF UP TO 1500:1.
3611
3618
3627
3648
None of the above
7) TRUE OR FALSE: ALL BROADCOM Q-SERIES SPECTROMETERS CAN BE USED WITH ITS WAVES
SPECTROMETER SOFTWARE, WHICH SIMPLIFIES DATA ACQUISITION AND SPECTRA EVALUATION.
True
False
8) THE SPECTRAL ANALYSIS OF ENVIRONMENTAL AND GEOLOGICAL IRRADIANCE IS A
SPECTROMETER APPLICATION WHERE _____ SPECTROMETERS ARE USED TO IDENTIFY
SPECTRALLY AND PHYSICALLY DISTINCTIVE FEATURES OF DIFFERENT SURFACE MATERIALS
AND ROCK TYPES.
Optical
Mass
Scattering
Transmittance
All of the above
9) NITRATE-NITROGEN CONTAMINATED DRINKING WATER CAUSES HARM WHEN THE NITRATE
CHANGES INTO NITRITE WITHIN THE DIGESTIVE SYSTEM. THE QMINI UV AND QMINI WIDE UV
SPECTROMETERS CAN BE A GOOD FIT FOR ONLINE DETECTION OF NITRITE AND NITRATE
CONTENT IN WASTE AND FRESHWATER.
True
False
10) OPTICAL SPECTROMETERS ARE GENERALLY CLASSIFIED BY __________ AND LIGHT
INTERACTION PROPERTIES.
Frequency
Wavelength
Voltage
Current
None of the above
Alas, you didn't quite meet the grade. You only got %. Have another look through
the course, and try again.
You nailed it, and scored %! To earn the Tools & Test Equipment III Badge, leave
us some feedback in the comments section and give the module a star rating. You
may also download the pdf for future reference. Other topics you want to learn?
Send a suggestion.
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Durchschnittliche Benutzerbewertung: 4 von 5 (21 Bewertungen)
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* 21 Kommentare
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* charlieo21 27.08.2021 21:18
Great content! Never used an spectrometer but it a real cool technology
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* fmilburn 27.08.2021 21:24
If you follow my posts on element14 you know I like optical spectrometers.
How could I have missed number 8?
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* kmikemoo 27.08.2021 21:48
Very interesting module. 100% first try. I either paid attention or guessed
well. It's amazing how this tech can detect even ppm traces of stuff with
light.
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* beacon_dave 27.08.2021 22:59
An interesting subject area. They may be pocket-sized but at circa £5k a time
you had perhaps better double-check your pockets before doing the laundry...
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* dougw 27.08.2021 23:14
For a few years this type of stuff was an everyday topic at my work.
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* ralphjy 27.08.2021 23:53
Nice overview and nice instrumentation. Be great to experiment with, but I
probably wouldn't use one enough to make it worth the expense...
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* neuromodulator 28.08.2021 00:23
Interesting technology with a wide range of applications.
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* maxpowerr 28.08.2021 00:47
I have long wanted to study this topic.
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* aspork42 28.08.2021 17:51
I Grew up in the graphics and printing industry and used to work on
closed-loop color control systems for printing presses. A spectrophotometer
would scan back and forth across the printed page and read the color bars (or
images themselves!) and drive the press to adjust its color.
I Actually built my own poor-man’s Specto on E14 with an RGB LED and a
photoresistor
WWCS - World's Worst Color Sensor - Project 14 Photonics Challenge
It worked surprisingly well considering it was with about $0.03 worth of
electronics in the business end
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* glennvanderveer 29.08.2021 14:28
Some of my answers where just a shot in the dark...
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* wolfgangfriedrich 30.08.2021 16:57
Two Photons Finish their shift at their job, hop a cab and head to a bar.
They enter the bar and the bartender asks "Are you coming or leaving?" One of
the photons replies "Isn't it obvious?"
The bartender replies "No, I'm colorblind.
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* john.porter 31.08.2021 09:09
Interesting topic!
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* lui_gough 01.09.2021 03:23
Not a topic I expected to see at element14 ... but the quiz was not too tough
as I've had some use of spectrometers in my past.
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* Fred27 01.09.2021 09:32
An interesting subject. For Q10 though, I'd suggest that if wavelength is
correct then frequency could also be considered a correct answer.
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* rsjawale24 04.09.2021 22:03
Good quiz. Learnt a lot about spectrometers. Thinking of making a simple
inexpensive DIY optical spectrometer
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* c4m4ch0 11.09.2021 17:35
Great quizz. Anyone knows about a test equipment that can measure the radiant
intensity of an IR LED? I know about the NIR equipment but those are more
suitable for the the IR LED itself and I was wondering if there is a way to
measure the radiant intensity in a final product, where the IR LED it is
already assembled.
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* COMPACT 12.09.2021 00:34
The spectometer from Ghostbusters!
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* phoenixcomm 12.09.2021 21:06
Hard Quiz, lot of prior knowledge go me 80% the first time.
~~Cris
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* sokol07 22.09.2021 11:16
Very nice article on a very interesting topic. Unfortunately, there were many
questions about datasheets in the quiz which I didn't like.
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* albertabeef 22.09.2021 16:21
Great module !
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* kmschmi 22.09.2021 20:42
Always interesting content
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