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Testing device and method utilizing optical waveguide micro-ring resonator for testing methane concentration

A technology of microring resonator and methane concentration, which is applied in the measurement of phase influence characteristics, etc., can solve the problems affecting the accuracy of methane concentration test, and achieve reliable results and high measurement accuracy

Active Publication Date: 2015-11-11
BEIJING COAL MINING ELECTRIC EQUIP TECHN DEV +1
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Problems solved by technology

[0005] The present invention provides a test device and method for testing methane concentration by using an optical waveguide microring resonator, which is used to solve the problem of affecting the accuracy of methane concentration test due to the defects of the optical fiber itself in the existing test scheme

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  • Testing device and method utilizing optical waveguide micro-ring resonator for testing methane concentration
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  • Testing device and method utilizing optical waveguide micro-ring resonator for testing methane concentration

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specific Embodiment 2

[0039] like Figure 4 As shown, the ring waveguide 12 of the microring resonator 10 in the first embodiment above can use a rectangular waveguide to facilitate the coating of the sensitive film 122 and the calculation of its effective refractive index. Wherein, the sensitive film 122 can be coated on one or more surfaces of the upper surface, the left side wall surface and the right side wall surface of the waveguide core 121, so that the sensitive film 122 can contact the methane gas in the air and generate covalent It works. Those skilled in the art can choose the position and method of coating the sensitive film 122 according to the actual situation, which is not limited in this application.

[0040] Preferably, the thickness of the sensitive film 122 is at least 0.5 μm. Specifically, when the optical signal is transmitted in the waveguide core 121 of the ring waveguide 12, the sensitive film 122 with a thickness greater than 0.5 μm can prevent the optical signal from pen...

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Abstract

The invention provides a testing device and method utilizing an optical waveguide micro-ring resonator for testing methane concentration. The micro-ring resonator in the testing device is composed of two parallel waveguides and an annular waveguide, wherein the annular waveguide comprises a lower cladding, a waveguide core arranged on the lower cladding and a sensitive membrane arranged on the surface of the waveguide core in a coating mode. The sensitive membrane is used for covalent interaction with methane gas so that the effective refractive index of the annular waveguide can be increased along with increase of the methane concentration. Through measuring the central wavelength of an output optical signal, the corresponding methane gas concentration is obtained through calculation. Due to the facts that the central wavelength of the output optical signal is measured through the testing device and method for the methane concentration, and it is unnecessary to measure the light intensity of the output optical signal, the angle of incident light and attenuation on the light intensity by materials have no influences on measurement, the testing device and method utilizing the optical waveguide micro-ring resonator for testing the methane concentration are higher in measurement accuracy and more reliable in result.

Description

technical field [0001] The invention relates to the field of optical sensors, in particular to a testing device and method for testing methane concentration by using an optical waveguide micro-ring resonator. Background technique [0002] The mining of coal mines needs to be done underground. During the mining process, a large amount of harmful gases are likely to be produced. Among them, methane gas is the most likely to cause safety accidents and threaten the lives of miners. In order to ensure the safety of coal mining, the detection of methane gas has become the focus of coal mining. [0003] The existing methane gas detection methods mainly include catalytic combustion type, semiconductor type, electrochemical type, optical type and so on. Among the existing optical sensors, the optical fiber spectral absorption type methane gas sensor is mainly used to detect the methane gas concentration. Its detection principle is mainly based on the absorption spectrum characteris...

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Application Information

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IPC IPC(8): G01N21/41
Inventor 王文清王晓璐牛小铁任安祥张春芝田柏林任凤国李萍陈耕王婉琳
Owner BEIJING COAL MINING ELECTRIC EQUIP TECHN DEV
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