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首页> 外文期刊>Applied physics >Methodology for temperature measurements in water vapor using wavelength-modulation tunable diode laser absorption spectrometry in the telecom C-band
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Methodology for temperature measurements in water vapor using wavelength-modulation tunable diode laser absorption spectrometry in the telecom C-band

机译：使用电信C波段中的波长调制可调二极管激光吸收光谱法测量水蒸气中的温度的方法

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摘要

A methodology based upon wavelength modulation and two-line thermometry for assessment of gas temperature by tunable diode laser absorption spectroscopy utilizing a standard tunable distributed feedback (DFB) diode laser working in the telecom C-band has been developed. Due to the high density of water lines in this wavelength region at elevated temperatures the methodology does not make use of two individual lines, but rather two groups of lines. The two groups identified have been found to have favorable properties for accurate temperature assessment in the 200-1000℃ range, primarily a separation that is within a single DFB laser scan (～20 GHz), an adequate linestrength, and sufficient difference in temperature dependence; the ratio of the peak values of the 2f-wm-signals, R, was found to increase monotonically with temperature, T, with a relative sensitivity, (ΔR/R)/(ΔT/T), above or around unity for most of the pertinent temperature range. The standard deviation of a temperature measurement with a 1 s integration time was found to be below 0.3%. It is shown that the temperature assessment has virtually no dependence on water concentration but a weak dependence on modulation amplitude.
机译：已经开发了一种基于波长调制和两线测温法的方法，该方法通过使用在电信C波段工作的标准可调分布式反馈（DFB）二极管激光器的可调二极管激光吸收光谱法评估气体温度。由于在高温下该波长区域中水管线的密度很高，因此该方法不使用两条单​​独的管线，而是使用两组管线。已发现确定的两组具有良好的特性，可在200-1000℃的范围内进行准确的温度评估，主要是在单次DFB激光扫描（约20 GHz）内进行的分离，足够的线强度和足够的温度依赖性差异;在大多数情况下，发现2f-wm信号的峰值比率R随着温度T单调增加，并且相对灵敏度（ΔR/ R）/（ΔT/ T）大于或等于1。有关的温度范围。发现积分时间为1 s的温度测量的标准偏差低于0.3％。结果表明，温度评估实际上与水浓度无关，而对调制幅度的依赖性很弱。

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