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可调谐二极管激光吸收光谱技术(TDLAS)是利用二极管激光器的波长扫描和电流调谐特性来实现痕量气体吸收曲线二次谐波检测的一种新技术,具有高灵敏、高选择性、高精度等特点。理论分析和实验结果表明:利用二次谐波检测到的信号特征除了与被测气体的吸收特征有关外,还与波长扫描参数和电流调制参数有密切的关系。通过研究不同波长的扫描参数和在功率调制参数下的二次谐波曲线,分析了它们的波形特征和稳定性,以便寻求最佳的波长扫描参数和功率调制参数,从而使二次谐波曲线的稳定性和形状达到最佳。
Tunable Diode Laser Absorption Spectroscopy (TDLAS) is a new technique to detect the second harmonic of trace gas absorption curve by wavelength scanning and current tuning characteristics of diode laser. It has the characteristics of high sensitivity, high selectivity, high precision, etc. Features. Theoretical analysis and experimental results show that the signal characteristics detected by the second harmonic are closely related to the wavelength scanning parameters and the current modulation parameters except for the absorption characteristics of the gas to be measured. By studying the scanning parameters of different wavelengths and the second harmonic curves under the power modulation parameters, their waveform characteristics and stability are analyzed in order to find the best wavelength scanning parameters and power modulation parameters, so that the second harmonic curve The stability and shape to achieve the best.