On-site electromagnetic interference analysis and anti-interference optimization of mine gas sensor

Abstract

After the upgrading of coal mine safety monitoring system, the system has a certain anti-electromagnetic interference ability. However, it is found that some gas sensors still have “displaying large number” and other faults in practical use, especially for the sensors distributed near some large frequency conversion equipment, the problem is more severe. In view of this phenomenon, we use spectrometer to measure the electromagnetic environment in the problem area, analyze the spectrum characteristics and coupling path of the interference of the sensor, and us ADS simulation software to analyze the reason why the current filter module cannot make the sensor immune to the electromagnetic interference generated by the frequency converter. Finally, the filter parameters are adjusted according to the interference frequency band, and the conducted disturbance immunity test induced by the corresponding RF field is added for verification. The results show that after the optimized sensor passes the new test, it is placed in the same position on the site, and there is no “displaying large number” phenomenon.

Keywords

• monitoring system
• electromagnetic compatibility
• mining sensor
• frequency conversion equipment
• radio frequency transmission