基于内腔光纤激光器的痕量气体光谱检测

Research on Trace Gas Spectral Measurement on Intra-Cavity Fiber Optic Laser

因为器件性价比高、可复用、远距离探测,抗电磁辐射等优势,基于内腔光纤激光器的气体光谱检测方法受到了广泛的关注。通过精心设计气室和反射镜,建立了内腔光纤激光器气体检测系统。在锯齿波电压驱动下,F-P可调谐滤波器连续调谐,实现了波长扫描,可获得多条气体吸收谱线,一次扫描相当于多次测量,极大的提高了测量灵敏度。实验结果表明,检测误差可控制在100ppm内,相对误差小于实际气体浓度的3%。

Due to the advantages of immunity of electrical/electronic,high performance cost ratio,remote detection and multiplexing capability,intra-cavity fiber optic gas measurement has aroused wide concern.The trace gas measurement system has been developed based on the elaborated gas cell and reflector.The wavelength sweeping technique（WST） is realized when the Fabry-Perot type tunable optical filter is applied by the sawtooth driver voltage.Multi absorption lines can be obtained and one scanning measurement with WST is equal to multiple independent detections,so the gas measurement sensitivity is improved remarkably.The experimental results show that the acetylene detection sensitivity is reduced to less than 100 ppm and the relative measurement error is less than 3% of practical gas concentration.