FAN Song-tao1, ZHOU Yan1, PAN Jiao-qing2, et al. Design of laser methane detecting system based onSTM32 and FPGA[J]. 2012, 31(10): 116-118. DOI: 10.13873/j.1000-97872012.10.001.
The system scheme based on STM32 and FPGA is designed in order to develop the miniaturization practical laser methane detecting system.The generation of the orthogonal vector lock-in amplifier and laser modulation driving signal is implemented on the FPGA chip.STM32 is responsible for the temperature control of semiconductor lasers
calculation of gas volume fraction
communication interface and other functions.Four standard methane samples are tested by the designed laser methane detecting system
indicating error is less than ±0.2% at the full scale of 10%.This scheme can be used as a common platform for the laser gas detecting system to realize measurement of other gases.
Second-harmonic detection with tunable diode lasers — Comparison of experiment and theory [J] . J. Reid,D. Labrie. Applied Physics B Photophysics and Laser Chemistry . 1981 (3)