All-optical gas detection method and device based on Michelson interference principle
A Michelson full-detection device technology, applied in the field of all-optical gas detection methods and devices, can solve the problem of low measurement accuracy, and achieve the effects of high measurement accuracy, improved measurement accuracy, and enhanced flexibility
Active Publication Date: 2015-07-01
山西迪奥普科技有限公司
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[0006] The present invention provides an all-optical gas detection method and device based on the Michelson interference principle to solve the technical problem that the current photoacoustic spectroscopy technology is easily interfered by the external electromagnetic environment when measuring the gas concentration, resulting in low measurement accuracy.
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[0023] An all-optical gas detection method based on Michelson interference principle, including a gas resonance generation method based on a tuning-fork quartz crystal oscillator; also includes a Michelson all-optical detection method; the Michelson all-optical detection method adopts the following steps: introduce a beam The detection light is divided into two beams. One beam is incident on the outer side of any vibrating arm of the tuning fork quartz crystal. After reflection, Michelson interference occurs with the other beam to produce interference fringes of equal thickness; The fringe-shaped diaphragm matched with the interference fringe allows one or more bright lines to be transmitted to a fixed receiving surface while blocking the rest. When the vibrating arm does not move, the fringe-shaped diaphragm just makes one or more bright lines of the interference fringe of equal thickness. Pass through, and block the rest, so that when the vibrating arm vibrates, the stripes wi...
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Abstract
The invention relates to a photoacoustic spectral measurement technology and in particular relates to an all-optical gas detection method and device based on the Michelson interference principle. The technical problem that an existing photoacoustic spectral technology for measuring gas concentration is easily interfered by an external electromagnetic environment is solved. The all-optical gas detection method based on the Michelson interference principle comprises a gas resonance generation method based on a tuning-fork type quartz crystal oscillator and also comprises a Michelson all-optical detection method, wherein the Michelson all-optical detection method comprises the steps of introducing a detection light beam, splitting the detection light beam into two beams, allowing one light beam irradiating the outer side surface of any oscillation arm of the tuning-fork type quartz crystal oscillator to generate Michelson interference with the other light beam after the first light beam is reflected so as to generate interference stripes with equal thickness, and acquiring a light intensity change value produced by one or more bright stripes on a fixed receiving surface along with the oscillation of the oscillation arm, thus obtaining the concentration of gas to be detected according to the light intensity change value. According to the all-optical gas detection method and device based on the Michelson interference principle, the measurement precision is very high, the interference of the electromagnetic environment is effectively avoided, and the advantages of the Michelson interference principle can be fully developed.
Description
Technical field [0001] The invention relates to a photoacoustic spectrum measurement technology, in particular to an all-optical gas detection method and device based on the Michelson interference principle. Background technique [0002] With the continuous development of science, technology, economy and society, environmental problems have become increasingly prominent. Whether for industrial production monitoring or people’s healthy life, the monitoring of gas quality is becoming more and more important, and relevant researchers have been doing this. Unremitting efforts. Laser photoacoustic spectroscopy technology is a relatively mature gas detection technology. It has the advantages of high detection sensitivity, large dynamic response range and fast response speed. It is used in air quality monitoring, petrochemical, aerospace medical, and national defense scientific research fields. Has a wide range of applications. [0003] Traditional laser photoacoustic spectroscopy tec...
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IPC IPC(8): G01N21/39
Inventor 董磊武红鹏刘研研
Owner 山西迪奥普科技有限公司