Optical fiber hydrogen sensor demodulation method
A demodulation method and sensor technology, applied in the field of demodulation, can solve the problems of complex structure, high cost, poor accuracy, etc., and achieve the effects of high-precision measurement, simplified structure, and reduced cost
Active Publication Date: 2018-04-17
润桐(苏州)技术服务有限公司
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the defects of high cost, poor precision and complicated structure in the working process of the existing demodulation device, and provide a kind of optical fiber hydrogen sensor demodulation device, thereby solving the above problems
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[0019] Example: such as figure 1 As shown, the present invention provides a fiber optic hydrogen sensor demodulation device, including a wide-spectrum light source 101, an electro-optic modulator 105, and a computer 202. A section of palladium film 103 is plated on the surface, and the surface of the palladium film 103 is provided with a reflector 104. The output port of the photocoupler 102 and the reflective film 104 form a Michelson interferometer, and the output end of the Michelson interferometer is connected to the electro-optic modulator 105. The modulated signal output by the electro-optic modulator 105 is incident on the high-speed photodetector 107 after passing through the dispersion fiber 106. The high-speed photodetector 107 converts the optical signal into a microwave signal and amplifies it through the low-noise amplifier 108. The output of the low-noise amplifier 108 is connected to Microwave power divider 109 , microwave power divider 109 injects a part of the...
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The invention discloses a demodulation method based on an optical fiber hydrogen sensor demodulation device. The device comprises a wide-spectrum light source, an electro-optic modulator and a computer, wherein the output end of the wide-spectrum light source is connected with a photoelectric coupler, a section of palladium film is plated on the optical fiber surface of one output end of the photoelectric coupler, an output port of the photoelectric coupler and a reflective film constitute a Michelson interferometer, the output end of the Michelson interferometer is connected with the electro-optic modulator, modulated signals output by the electro-optic modulator are incident onto a high-speed photoelectric detector after passing through a dispersion optical fiber, the high-speed photoelectric detector converts optical signals to microwave signals, the microwave signals are amplified by a low-noise amplifier, the output end of the low-noise amplifier is connected with a microwave power splitter, the microwave power splitter injects one part of the microwave signals into the electro-optic modulator and simultaneously inputs the other part of the microwave signals into a spectrum analyzer, and the end of the spectrum analyzer is connected with the computer. The method proposed by the invention can realize high-precision measurement of hydrogen concentration, and simultaneously can reduce the cost and simplify the structure.
Description
technical field [0001] The invention relates to a demodulation method, in particular to a demodulation method of an optical fiber hydrogen sensor. Background technique [0002] Hydrogen is widely used as a combustible energy source and reducing agent in aviation, chemical and medical fields. Since hydrogen will explode when it encounters an open flame when the concentration exceeds 4% during use, with the wide application of hydrogen, the detection of hydrogen concentration is also paid attention to. [0003] At present, the optical methods for detecting hydrogen concentration include interference-type hydrogen sensing and demodulation system based on light interference, micro-lens hydrogen sensing and demodulation system based on light reflection, hydrogen sensor and fiber Bragg grating hydrogen gas sensor based on the principle of evanescent field. Sensing demodulation system. The interferometric hydrogen sensing and demodulation system has the problem of complex manufac...
Claims
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Login to View More IPC IPC(8): G01N21/01G01N21/45
CPCG01N21/01G01N21/453
Inventor 卢平
Owner 润桐(苏州)技术服务有限公司