Tunable diode laser based spectroscopic system for ammonia detection in human respiration

Tunable diode laser based spectroscopic system for ammonia detection in human respiration

A high‐resolution infrared optical absorption spectroscopy system based on lead‐salt tunable diode lasers as light sources has been developed for detection and monitoring of trace gases by resolving their narrow‐width absorption bands. The system is a double beam setup, where a reference cell contai...

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Veröffentlicht in:Review of scientific instruments 1987-06, Vol.58 (6), p.923-927
Hauptverfasser: Lachish, Uri, Rotter, Shlomo, Adler, Eli, El‐Hanany, Uri
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Applied sciences
Exact sciences and technology
Other techniques and industries
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container_end_page 927
container_issue 6
container_start_page 923
container_title Review of scientific instruments
container_volume 58
creator Lachish, Uri
Rotter, Shlomo
Adler, Eli
El‐Hanany, Uri
description A high‐resolution infrared optical absorption spectroscopy system based on lead‐salt tunable diode lasers as light sources has been developed for detection and monitoring of trace gases by resolving their narrow‐width absorption bands. The system is a double beam setup, where a reference cell containing the monitored gas is used for tuning and locking the laser light frequency to that of a desired absorption line and a measurement cell where the examined gas flows continuously at a reduced pressure. Frequency modulation of the laser light is achieved by square waveform modulation of its current source and both the frequency locking and signal analysis devices are based on sample‐and‐hold techniques. The system capability is demonstrated by the monitoring of ammonia traces in human breath. Gas trace monitoring in respiration may prove to be an effective medical diagnostic method.
doi_str_mv 10.1063/1.1139577
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language eng
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source AIP Digital Archive
subjects Applied sciences
Exact sciences and technology
Other techniques and industries
title Tunable diode laser based spectroscopic system for ammonia detection in human respiration
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