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Questions tagged [spectroscopy]

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Focusing on specific input range of transimpedance amplifier

I am trying to make a spectrometer to measure TSS (total suspended solids) in water to that end I'm using a photodiode going into a standard transimpedance amplifier which works as expected if i block ...
Andreas k-rasmussen's user avatar
1 vote
1 answer
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What are the units of the channels of the SparkFun NIR Spectral Sensor?

The product is https://www.sparkfun.com/products/14351 and the datasheet can be found at https://cdn.sparkfun.com/assets/1/b/7/3/b/AS7263.pdf. I'm not entirely sure about the difference between the &...
soravoid's user avatar
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2 answers
91 views

voltage-controlled current source for electrochemical impedance spectroscopy

Problem I want to do DIY electrochemical impedance spectroscopy for frequencies up to 10 kHz. I have a little water electrolysis cell with impedance as low as 0.1 Ω and I am feeding several amps of ...
Ilka's user avatar
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Different Vertical and Horizontal full well capacities for CCD image sensors

I want to use a line sensor for a medical imaging application. I understand that the full well capacity of the pixel is the maximum number of photo-electrons it can store before it gets saturated. I ...
AragornElessar's user avatar
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How to resample spectral data into intensities of spectral bands for SparkFun spectral sensor?

My end goal is to create a machine learning model that can classify spectroscopic data from the SparkFun spectral sensor (https://www.sparkfun.com/products/14351). Unfortunately, it's infeasible for ...
soravoid's user avatar
1 vote
1 answer
87 views

On the understanding of signals from an IR detector coupled to a lock in amplifier

I have a CW laser which is modulated by an optical chopper rotating at 1kHz. The modulated CW beam struck a sample holder and the absorption signal is recorder via an Infrared Associates MCT detector. ...
Strelok's user avatar
  • 111
5 votes
1 answer
337 views

Interfacing an old spectrometer with PySerial

I asked this question on the Engineering StackExchange and someone said it might be more appropriate here. I want to interface an old Shimadzu spectrophotometer (Model UV-1601, manual here) through ...
Omnistic's user avatar
1 vote
3 answers
143 views

Is there a strategy for reconstructing a circuit given the frequency response?

So I recently worked with a problem where I was given a bode plot where magnitude of the transfer function (the ratio between the output and input voltage) was plotted against frequency of the system. ...
Tanamas's user avatar
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1 answer
265 views

Level translator as digital buffer

In the datasheet of the C12880MA (Mini-spectrometer) they recommend using a digital buffer on pins to and from the module (CLK, ST, EOS, TRG): I'm not sure why. In my case, I need level translation ...
Francois's user avatar
  • 577
1 vote
0 answers
109 views

How to measure radio wave penetration and reflection through different mediums

I would like to do a few experiments to test how different EM radiation frequencies (915 MHz to 5 GHz) interact with 3D print filament materials (like PLA, PolyCarbonate, TPU, etc...). Specifically I ...
Spesemper's user avatar
1 vote
2 answers
177 views

Optical filters: What is the difference between Free Spectral Range (FSR) and the resolution based on (FWHM)

I have a question regarding the Free Spectral Range (FSR) and resolution based on (FWHM) of optical filters like based on Fabry-Perot-Interferometers. As of now, I always thought of the resolution as ...
Dakalaom's user avatar
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