GAS SENSOR

PROBLEM TO BE SOLVED: To reduce a sub-mode suppression ratio and to detect gas accurately and inexpensively by a gain-coupling distribution feedback(GC-DFB) laser as the light source of a laser beam. SOLUTION: As a device for light source of a laser beam, a semiconductor laser 6 consisting of a GC-D...

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Bibliographic Details
Main Authors KIMURA KIYOSHI, TAKAHASHI YOSHIO, TOUMON RYOICHI, TSUKAMOTO TAKESHI, KIKUKAWA TOMOYUKI
Format Patent
LanguageEnglish
Published 26.11.1999
Edition6
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:PROBLEM TO BE SOLVED: To reduce a sub-mode suppression ratio and to detect gas accurately and inexpensively by a gain-coupling distribution feedback(GC-DFB) laser as the light source of a laser beam. SOLUTION: As a device for light source of a laser beam, a semiconductor laser 6 consisting of a GC-DFB laser that causes less sub-mode suppression ratio due to return light to decrease and cannot become multiple mode easily is provided on a mounting stand 5, thus eliminating the need for executing, especially measures against return light (oblique machining and layout), at a condensing lens 8, a reference gas cell 10, and a light receiver 11 at the side of a reference gas, and eliminating the need for an expensive isolator for preventing the passage of reflection light. Therefore, even if return light due to reflection occurs, the reduction of the sub-mode suppression ratio is small, gas can be detected accurately, and the costs of a device can be reduced.
Bibliography:Application Number: JP19980124605