Temperature measurement principle and modulation absorption spectroscopy were introduced, and the influence of modulation amplitude on gas temperature measurement was analyzed.
介绍了温度测量及调制吸收光谱技术原理，分析了调制幅度对气体温度测量的影响。
Optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy (OH-MR-VMS) is an absorption spectroscopic technique for selective detection of the molecular ions.
光外差磁旋转速度调制光谱技术是一种对离子分子选择性测量的高灵敏激光吸收光谱技术。
Secondly, spectral modulation techniques are applied into concentration detection because methane has very weak absorption in near-infrared region.
其次，针对甲烷在近红外波段吸收弱的特点，把光谱调制技术用于浓度检测。
The experiment shows that the bandwidth of the time delay as a function of the modulation frequency changes in the absorption and gain regimes due to the carrier-lifetime variation.
实验结果表明，由于载体寿命的变化，在吸收和增益区域，带宽的时滞随着调制频率的变化而变化。
Difference absorption measurement and wavelength modulation harmonic measurement are two fundamental approaches for gas light absorption detection.
差分吸收检测和波长调制谐波检测是气体光吸收检测的两种基本方法。
We present a signal_processing system developed for enhancing the sensitivity of absorption measurement based on tunable diode laser wavelength modulation spectroscopy.
基于可调谐半导体激光吸收光谱，提出了一种新的信号处理方法用于提高吸收光谱测量的灵敏度。
The principles of intensity modulation and difference absorption are discussed. The scheme of fiber grating and difference absorption detection is designed.
分析了强度调制和甲烷浓度差分检测原理，建立了光纤光栅式差分检测方案；
The principles of intensity modulation and difference absorption are discussed. The scheme of fiber grating and difference absorption detection is designed.
分析了强度调制和甲烷浓度差分检测原理，建立了光纤光栅式差分检测方案；
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