Method of controlling a short-etalon fabry-perot interferometer used in an NDIR mearsurement apparatus
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United States of America Patent
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Nov 10, 1998
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N/A
app pub date -
Jul 5, 1996
filing date -
Jul 7, 1995
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Abstract
A method of controlling a short-etalon Fabry-Perot interferometer used in an NDIR measurement apparatus includes generating a measurement signal using a radiant source. The measurement signal is provided to a sample point containing a gas mixture to be measured. The measurement signal is bandpass-filtered with an electrically tuneable Fabry-Perot interferometer using at least two wavelengths of the interferometer passband. The measurement signal is passed via an optical filter component prior to detection, and the filtered measurement signal is detected by a detector. During the measurement cycle, the passband frequency of the interferometer is controlled to coincide at least partially with the cutoff wavelength range of the optical filter component.
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