Title:
INTERFEROMETER ABSOLUTE-DISPLACEMENT DEMODULATION SYSTEM AND METHOD USING GAS ABSORPTION SPECTRUM AS REFERENCE
Document Type and Number:
WIPO Patent Application WO/2024/077503
Kind Code:
A1
Abstract:
An interferometer absolute-displacement demodulation system and method using a gas absorption spectrum as a reference. The demodulation system comprises a scanning laser device (1), an optical fiber isolator (2), an optical fiber coupler (3), an interferometer (4), a signal detector (51), a reference detector (52), a signal amplifier, a microprocessor and a gas-reference gas chamber (6), which are connected in an optical path, wherein the gas-reference gas chamber (6) is filled with a reference gas which has an absorption peak within the wavelength scanning range of the scanning laser device (1). In the demodulation system and method, by means of using, as an absolute spectrum reference location, the absorption spectrum of a reference gas which has an absorption peak within the wavelength scanning range of the scanning laser device (1), and in combination with a calibration method for transforming a fixed wavelength of an absorption spectrum line and a half width of the spectrum line, or a wavelength spacing between two absorption spectrum lines, from a time axis to a wavelength axis or a phase axis, the measurement of the absolute value of the cavity length of an interference cavity is completed by means of cooperatively using characteristic points of an interference fringe itself. The demodulation system and method is applicable to various sensing apparatuses based on the principle of interferometry, thereby realizing interference demodulation with high levels of efficiency, high levels of precision, low levels of power consumption and a low cost.
Inventors:
NING YANONG (CN)
LIU TONGYU (CN)
YANG QINGSHAN (CN)
LIU TONGYU (CN)
YANG QINGSHAN (CN)
Application Number:
PCT/CN2022/124758
Publication Date:
April 18, 2024
Filing Date:
October 12, 2022
Export Citation:
Assignee:
GUANGDONG LASER SENSOR TECH CO LTD (CN)
International Classes:
G01D5/353; G01D18/00; G01N21/39; G01N21/45
Foreign References:
| CN102235968A | 2011-11-09 | |||
| CN108204827A | 2018-06-26 | |||
| CN102494874A | 2012-06-13 | |||
| AU2020103626A4 | 2021-02-04 | |||
| CN101718942A | 2010-06-02 | |||
| CN104931081A | 2015-09-23 | |||
| CN110657947A | 2020-01-07 | |||
| CN111442716A | 2020-07-24 | |||
| CN114062275A | 2022-02-18 | |||
| DE102020208869A1 | 2022-01-20 |
Attorney, Agent or Firm:
FOSHAN PROCUS INTELLECTUAL PROPERTY LAW FIRM (CN)
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