Title:
ノイズキャンセリング検出器
Document Type and Number:
Japanese Patent JP6840134
Kind Code:
B2
Abstract:
The present invention relates to an optical gas detector for detecting a gas absorbing light at a known wavelength, wherein the gas detector comprises two essentially identical, parallel membranes defining a volume between them containing the gas to be investigated, and a modulated first light source emitting light at said known wavelength into said volume at a chosen frequency, the detector is adapted to detect relative movements between said membranes and said movements having a frequency corresponding to the rate or a multiple of the rate of said pulsed light source, and wherein the said volume has at least one opening allowing the gas to unrestricted flow or diffuse into said volume.
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Inventors:
Eve-Rene Johansen
Application Number:
JP2018512161A
Publication Date:
March 10, 2021
Filing Date:
September 26, 2016
Export Citation:
Assignee:
Synteph Tio Aksell Scabet
International Classes:
G01N29/24; G01N29/32
Domestic Patent References:
| JP2009036578A | ||||
| JP54071682A | ||||
| JP9145683A | ||||
| JP2009294023A | ||||
| JP2015014464A | ||||
| JP2013150764A | ||||
| JP62291544A |
Foreign References:
| WO2003046498A1 | ||||
| WO2014202753A1 | ||||
| US20060126070 |
Other References:
J. Breguet et al.,Photoacoustic detection of trace gases with an optical microphone,Sensors and Actuators A,1995年,48,pp. 29-35
Attorney, Agent or Firm:
Yasuhiko Murayama
Shinya Mitsuhiro
Tatsuhiko Abe
Shinya Mitsuhiro
Tatsuhiko Abe