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可调谐半导体激光吸收光谱(TDLAS)技术是近年来发展起来的一种新型光纤气体传感器技术,目前这种技术主要有3类方法:谐波幅度法,一、二次谐波幅度比值法,差分法。针对这3类方法的特点与不足进行综合分析,并在此基础上提出了谐波峰平比法(PAPR)。采用该方法设计的光纤甲烷气体传感器性能稳定,样机经相关机构检测后表明,传感器响应时间为10 s,在0~5×10-3的量程内,检测精度达满量程的5%,灵敏度为2×10-5。
Tunable Semiconductor Laser Absorption Spectroscopy (TDLAS) is a new type of optical fiber gas sensor developed in recent years. Currently, there are three kinds of methods: harmonic amplitude method, first and second harmonic amplitude ratio method, differential law. Aiming at the characteristics and deficiencies of these three methods, a comprehensive analysis is made on the basis of which the harmonic peak-to-average ratio (PAPR) method is proposed. The performance of the optical fiber methane gas sensor designed by the method is stable. After the prototype is tested by relevant agencies, the response time of the sensor is 10 s, and the detection accuracy reaches 5% of the full scale in the range of 0 to 5 × 10-3. The sensitivity is 2 × 10-5.