Application Of Dual-Beam Second-Derivative Tunable Diode Laser Infrared Spectroscopy To Trace Gas Measurement At Atmospheric Pressure

R. G. Jungst; D. R. Tallant

doi:10.1117/12.932050

30 December 1981 Application Of Dual-Beam Second-Derivative Tunable Diode Laser Infrared Spectroscopy To Trace Gas Measurement At Atmospheric Pressure

R. G. Jungst, D. R. Tallant

Author Affiliations +

Proceedings Volume 0288, Los Alamos Conf on Optics '81; (1981) https://doi.org/10.1117/12.932050
Event: Los Alamos Conference on Optics, 1981, Los Alamos, United States

Abstract

A dual beam diode laser spectrometer has been constructed using off-axis reflective optics. The spectrometer can be amplitude modulated for direct absorption measurements or frequency modulated to obtain derivative spectra. The spectrometer has high throughput, is easy to operate and align, provides good dual beam compensation, and has no evidence of the interference effects that have been observed in diode laser spectrometers using refractive optics. Unpurged, using second derivative techniques, the instrument has measured 108 parts-per-million CO (10 cm absorption cell, atmospheric pressure-broadened) with good signal/noise. With the replacement of marginal instrumental components, the signal/noise should be substantially increased. This instrument was developed to monitor the evolution of decomposition gases in sealed containers of small volume at atmospheric pressure.

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R. G. Jungst and D. R. Tallant "Application Of Dual-Beam Second-Derivative Tunable Diode Laser Infrared Spectroscopy To Trace Gas Measurement At Atmospheric Pressure", Proc. SPIE 0288, Los Alamos Conf on Optics '81, (30 December 1981); https://doi.org/10.1117/12.932050

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