Based On Fabry-Perot Interferometer Colliery Gas Spectrum Cross-correlation Demodulation Technology Research

Mine disasters has long been plagued by problems of coal mining industry.Since coal resources more below the surface, plus the relatively poor conditions in the mine, once gas leakage accident, generally irreversible.Not only a waste of resources, even mine workers have paid with their lives.Thus, the early warning and real-time detection of coal mine safety is particularly important. With the development of optical fiber technology, fiber optic interferometric sensor as a gas sensor is often used to detect them.Optical fiber due to transmission speed, and with anti-electromagnetic interference, anti-corrosion, high temperature in extreme environments, high pressure can be maintained in the normal operation of the advantages of field-testing it is widely used in engineering.This selection of optical fiber F-P sensor as an object of study for the design of gas detection device.Firstly, the mine complex in harsh environments, and application status fiber FP sensor technology.Then summarize the research results at home and abroad in this regard, proposed correlation demodulation technique application spectrum fiber F-P gas sensing analysis of ideas.FPGA hardware circuitry to control the core, integrated spectral chamber interference device, image acquisition photoelectric conversion module, integrated AD conversion module, signal transmission module, computer data analysis.Finally, the hardware circuit design and simulation software to verify its possibilities.Through detection of each module separately functional verification, it proved the feasibility of the device.Finally, the sample gas to verify the performance of the device is detected by analyzing the experimental results, basically completed the design of the device to meet their inspection requirements.