The Development Of The Automatic Measurement Device For Optical Interference With Methane

As the primary cause of China's coal mine accidents,gas explosions have had a huge impact on China's coal mining resources.Therefore,the improvement of monitoring technologies for underground gas concentrations is imperative,so as to avoid such accidents.Optical interference methane detector is a real-time monitor used mainly in China's coal mining industry at the present stage.It has the advantages of stable measurement data,wide detection range,long service life,and no vulnerable originals.In the existing instruments that use light interference detection,most of the ordinary light bulbs are used as collection light sources,and the concentration of the measured gas is calculated through the amount of streaks directly observed by the human eye,and this may bring about artificial operation and people.The error caused by eye vision.To solve this problem,we proposed the use of digital image sensors(CMOS,Complementary Metal-Oxide Semiconductor)and(FPGA,Field Programmable Gate Arrays)to automate interference fringes in existing measurement methods for optical interference methane detectors.Acquisition and testing.With FPGA as the platform,the image processing algorithms of gray-scale conversion,median filter,binary processing and skeleton refinement are realized.Finally through the USB interface,the data transmission.The overall design of the system and each of its specific modules was completed on the Altera Corporation's development platform Quartos II and the logic analyzer Modelsim software embedded in it.The logic analysis and application simulation were completed.The analysis and simulation results show that applying the CMOS photoelectric conversion technology to the stripe acquisition can greatly improve the accuracy of the acquisition and avoid the errors caused by manual measurement;using FPGA to complete the processing ofimage data can not only be obtained as much as software The result of the algorithm processing can also greatly increase the working frequency and the efficiency of processing data,so as to achieve real-time image data processing.The system designed in this paper facilitates the implementation of downhole operations and greatly improves the detection accuracy.It also improves the shortcomings of conventional light interference gas detection systems,and has improved greatly in terms of technical indicators and practical applications.In addition,it has made beneficial exploration attempts for the application of FPGA in the detection of optical interference gas concentration,and has positive significance for the application design of real-time detection of gas concentration in the future with FPGA as the core.