HIGH SENSITIVITY SHORT-PATH MONITORING OF TRACE GASES EMPLOYING PbSnTe TUNABLE DIODE LASER.

Hiroya Sano, Ryuji Koga, Megumi Kosaka, Koji Shinohara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A system for atmospheric trace gas monitoring is described. The absorption spectrum in the infrared region of a specific gas is involved. A lead-salt diode laser is employed for the tunable light source and the short optical path of less than one meter allows the equipment to be portable. Fast measurement can be performed thanks to the built-in microcomputer and specially developed electronic system. Reliability is achieved because a correlational algorithm is calculated by the computer avoiding the ambiguity of the absolute laser frequency. Gas-density data is obtained every few seconds. Experiments were executed for methane, and a sensitivity of 0. 3 ppm multiplied by (times) m with S/N equals 1 was attained. A higher sensitivity down to 0. 01 ppm multiplied by (times) m is possible provided that a transversally mono-modal laser is employed.

Original languageEnglish
Pages (from-to)2145-2153
Number of pages9
JournalJapanese Journal of Applied Physics
Volume20
Issue number11
Publication statusPublished - Nov 1981

Fingerprint

Density of gases
Lasers
Monitoring
microcomputers
sensitivity
gas density
optical paths
Gases
gases
Microcomputers
ambiguity
lasers
Light sources
Semiconductor lasers
Absorption spectra
light sources
Methane
methane
Lead
semiconductor lasers

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

HIGH SENSITIVITY SHORT-PATH MONITORING OF TRACE GASES EMPLOYING PbSnTe TUNABLE DIODE LASER. / Sano, Hiroya; Koga, Ryuji; Kosaka, Megumi; Shinohara, Koji.

In: Japanese Journal of Applied Physics, Vol. 20, No. 11, 11.1981, p. 2145-2153.

Research output: Contribution to journalArticle

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