A Diode Laser Sensor for Measurement of Hydrogen Chloride Gas. Phase 1

In the Phase I research, breadboard instrumentation incorporating a standard commercial InGaAsP laser diode laser and an optically stable multiple pass absorption cell was used to measure the HC1 spectroscopic parameters needed to calibrate the technique and determine the conditions for optimum sens...

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Bibliographic Details
Main Authors: Stanton, Alan C, Silver, Joel A
Format: Report
Language:English
Subjects:
BREADBOARD MODELS
DETECTION
DETECTORS
DIODES
GALLIUM ARSENIDES
GASES
HIGH FREQUENCY
HYDROGEN CHLORIDE
INDIUM PHOSPHIDES
Inorganic Chemistry
INSTRUMENTATION
LASERS
LIMITATIONS
MODULATION
OPTIMIZATION
Physical Chemistry
SENSITIVITY
SPECTROSCOPY
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Summary:In the Phase I research, breadboard instrumentation incorporating a standard commercial InGaAsP laser diode laser and an optically stable multiple pass absorption cell was used to measure the HC1 spectroscopic parameters needed to calibrate the technique and determine the conditions for optimum sensitivity. The technique of two-tone FM spectroscopy employing high frequency laser modulation was then used for direct assessment of the sensitivity limits in measuring low concentrations of HC1 in air. The results were compared with a detailed model of the two-tone FM signal in order to analyze the sensitivity for an optimized system. The results of the Phase I experiments establish the feasibility of sensitive detection of hydrogen chloride gas with less than 1 second time response using this technique. A sensitivity of three parts per million HC1 in air at 50 torr, with a 0.3-second measurement integration time, was demonstrated. Keywords: Laser diode, Spectroscopy, Indium phosphides, Gallium arsenides, Hydrogen chloride.