Accession Number:

ADA199518

Title:

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

Descriptive Note:

Final technical rept. 12 Aug 1987-12 Jan 1988

Corporate Author:

SOUTHWEST SCIENCES INC SANTA FE NM

Personal Author(s):

Report Date:

1988-02-29

Pagination or Media Count:

40.0

Abstract:

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.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE