Questions tagged [spectrometry]

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How does the total pressure detector in a quadropole mass spectrometer work?

All quadropole mass spectrometers that I have seen provide a total pressure reading in addition to partial pressure readings for the selected masses. The mechanism of the total pressure measurement is ...
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How to obtain the spectral reflectance of a whole object?

I am interested in the colours of an object in a natural light environment. Specifically, I am interested in obtaining spectral reflectance data (i.e. the particular light wavelength(s) reflected of ...
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Meaning of SNR in Instrument Specifications

I am evaluating the specifications of an FTIR instrument (Bruker Vertex) and came across the following statements/items: Signal-to-Noise 5 sec sample, 5 sec reference: >10,000:1 (<4.34 x 10-5 ...
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2 votes
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Calculate FTIR-system response functions from measurements of a calibrated black body

I need to find the response of my FTIR spectrometer. I do have a calibrated black-body source (area-emitter) which I measured at various temperatures. The system operates in inverse cm, cm-1. My ...
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How to quantify adulteration of urea and hydrogen per oxide in cow milk? [closed]

I am very much new in this field and trying to get some information on adulteration of cow milk. I have searched and saw that mostly urea and hydrogen per oxide are mixed with cow milk. I found that ...
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5 votes
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How can I detect black spots?

I am researching about ways to continuously determine black spots (size 50+ micron) in our product stream. This stream consists of imperfect spherical polymer beads (size 3 mm) of different materials (...
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Quantifying Instrument Precision Using Multiple Measurements: Rounding

I'm working with a spectrometer that collects raw data as a 16-bit integer value, so the readout I get from a measurement always varies between 0 and 65,535. I'm trying to avoid implementing data ...
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How can I transfer a multivariate model between spectrometers without the use of standard samples?

Our lab has created several multivariate models to predict sample properties from infrared spectra. However, different spectrometers often give different responses, and often the model created on one ...
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