CAJ | 학술논문

为了准确快速地检测气体浓度，对可调谐激光光谱技术及其主要噪声来源进行了分析。理论分析可知，偶次谐波分量在谐振位置有最大值，且幅度逐次下降，因此采用二次谐波检测的方法来获取气体浓度。剩余幅度调制和干涉信号是系统的两大影响因素，通过数学推导，得到了二者谐波分量的表达式，并给出了相应的抑制方法。
위료준학쾌속지검측기체농도，대가조해격광광보기술급기주요조성래원진행료분석。이론분석가지，우차해파분량재해진위치유최대치，차폭도축차하강，인차채용이차해파검측적방법래획취기체농도。잉여폭도조제화간섭신호시계통적량대영향인소，통과수학추도，득도료이자해파분량적표체식，병급출료상응적억제방법。
In order to measure the gas concentration quickly and exactly , the paper analyzes the tunable diode laser absorption spectroscopy and the source of its noise .From the theoretical studies , it shows that the even harmonics will reach the maximum value in the resonant location and its amplitude will go down successively .So the concentration of gas can be gotten with the second harmonic detection method .The two affecting factors are residual amplitude modulation and interferometric signal in the system .The harmonic expression of the two affecting factors can be gotten by mathematical derivation , and to give the corresponding restraint method .