SHAN Ya-feng1, SUN Peng2, XU Yao-song2. Application of gas sensing technology in gas monitoring based on PCF[J]. 2013, 32(8): 142-145. DOI: 10.13873/j.1000-97872013.08.035.
In order to meet the need of coal mine gas monitoring
describes a photonic crystal fiber(PCF)gas volume fraction detector that is packed using metalized encapsulating technique
and heat shock method is used for PCF to write long period gratings.At the same time
the temperature stability of the system is tested.Test results show that the system has a good temperature stability with the PCF grating detectors
which can make up for the temperature influencing factors compared with previous gas detectors.The physical model of gas volume fraction detector set up in lab for the coal mine tunnel is established to detect the gas volume fraction
and WDM technology is used to overcome the limited multiplexing capacity issues in the roadway.In order to determine the gas distribution of coal mine roadway
when the measured value of the gas volume fraction is higher than the security setting
the system will drive alarm controller to send out warning.