Research of Absorbed Fiber-optic CO Gas Sensor Signal Processing
|School||Huazhong University of Science and Technology|
|Course||Mechanical and Electronic Engineering|
|Keywords||Fiber Gas Sensor Spectral absorption type optical fiber gas sensor Weak Signal Differential detection Harmonic Detection|
With oil and natural gas industry and the development of the coal industry , energy production , safety and environmental pollution problems become the focus of growing concern . Coal, metallurgy , casting, such as industrial production and daily life for a variety of toxic and hazardous , flammable or explosive gases is particularly important for real-time monitoring . Compared to traditional electrical sensors , fiber optic sensors in the course of the process will not produce sparks , less likely to cause an explosion , but also aging and poisoning phenomenon does not occur . Spectrum absorptive optical fiber gas sensor has high sensitivity , fast response time , high resolution , anti-electromagnetic interference , applicable to inflammable and explosive dangerous occasions advantages , much the attention of scholars at home and abroad , industrial production , environmental monitoring and other areas of significant research and practical value . This article , based on the carbon monoxide (CO) gas is chosen as the object of study , the key technology and main component modules of the spectral absorption -type fiber CO gas sensor detection system were studied . First , the spectrum of the gas molecules absorb theory , detection and harmonic detection both weak signal processing technology for the analysis of differential absorption , respectively , to finalize the theoretical model of the optical fiber gas sensor based on differential harmonic detection . Then combined with the specific requirements of the design , the design of the sensor system is the key part of the gas chamber , a reasonable choice of the major components of the sensor system , such as the light source , photodetector . Next, through the use of the modern photoelectric detection technology and weak signal processing technology , the design of the sensor system weak optical signal detection module , the preamplifier circuit , the band-pass filter circuit and differential toward circuit . Shortly thereafter, again with LabVIEW software the sensor system differential signal processing module designed as a platform . After the completion of the system design , in order to verify the feasibility and practicality of the design , its experimental measured final experimental data , and the experimental results are discussed , The results show that the design meets the expected requirements . Finally, a comprehensive summary of all the work done in the design and analysis of deficiencies , future research direction of the late .