Title:
LASER GAS CONCENTRATION METER
Document Type and Number:
WIPO Patent Application WO/2021/085331
Kind Code:
A1
Abstract:
[Problem] To provide a laser gas concentration meter that enables measurement of gas concentrations even under atmospheric conditions and that has a simplified configuration to achieve space saving. [Solution] A laser gas concentration meter 10 measures the concentration of residual specific gas by transmitting laser light of a specific wavelength through a gas-substituted and hermetically-sealed packaging material 50 in a measurement unit 13 disposed between a laser generating unit 11 and a laser receiving unit 12. The measurement unit has a total light path 20 of laser light including an incident light path 21, an attenuated light path 22 where the laser light transmitted through the packaging material is attenuated, and a transmitted light path 23. An attenuated absorbance of a specific wavelength on the attenuated light path is determined by eliminating, from a total absorbance with which the laser light has been absorbed by the specific gas on the total light path, an incident absorbance with which the laser light has been absorbed on the incident light path, and a transmitted absorbance with which the laser light has been absorbed on the transmitted light path. The concentration of residual gas in the packaging material is calculated from the attenuated absorbance and the length of the attenuated light path 22.
Inventors:
OSHIMA MASASHI (JP)
Application Number:
PCT/JP2020/039933
Publication Date:
May 06, 2021
Filing Date:
October 23, 2020
Export Citation:
Assignee:
GENERAL PACKER CO LTD (JP)
OSHIMA MASASHI (JP)
OSHIMA MASASHI (JP)
International Classes:
G01N21/3504; G01N21/39; G01N21/61
Foreign References:
| JP2016520838A | 2016-07-14 | |||
| US20100067012A1 | 2010-03-18 | |||
| JP2009014589A | 2009-01-22 | |||
| JP2010107197A | 2010-05-13 | |||
| JP2010038846A | 2010-02-18 | |||
| JP2018510346A | 2018-04-12 |
Attorney, Agent or Firm:
MIYAKE Hazime (JP)
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