Research on ultra low dew point in-situ on-line measurement technology for cryogenic wind tunnel
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摘要: 面向低温风洞极低露点原位在线测量需求，开展了基于激光吸收光谱的宽温域、高精度、极低露点原位在线测量技术研究。分析了激光吸收光谱露点测量技术原理，开展了吸收谱线选型、光谱参数标定和光谱信号处理方法研究，测量了低温平台原位在线露点和0.3 m低温引导风洞露点，并与冷镜式露点仪比较了测量精度。研究结果表明：激光吸收光谱露点测量技术可以实现宽温域、高精度、原位在线露点测量，露点测量范围–100～30 ℃，测量误差小于1 ℃，测量时间低于1 s，可满足低温风洞极低露点测量需求。Abstract: To achieve wide temperature domain, high precision and ultra low dew point in-situ on-line measurement in the cryogenic wind tunnel, a technology based on the laser absorption spectrum is developed. In the method, the principles of laser absorption spectroscopic technology for dew point measurement are analyzed firstly. Then the absorption spectroscopic selection, spectral parameter calibration and spectral signal processing are provided. The experiments are carried out on the low temperature platform and in the 0.3 m cryogenic wind tunnel, which are compared to the chilled-mirror dew-point hygrometer measurement. The experimental results show that the developed technology can achieve wide temperature domain, high precision and in-situ on-line dew point measurement. The measurement range is from –100 ℃ to 30 ℃, the error is less than 1 ℃, and the time is less than 1 s. It can be used for ultra low dew point in-situ on-line measurement in the cryogenic wind tunnel.
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图 2 TDLAS风洞试验段露点原位在线测量示意图
Fig. 2 Schematic diagram of in-situ on-line measurement of dew point with TDLAS in wind tunnel test section
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图 8 直接吸收、波长调制结合露点反演算法
Fig. 8 Direct absorption, wavelength modulation and dew point inversion algorithm
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图 11 TDLAS与冷镜露点测量结果对比（−10～30 ℃）
Fig. 11 Comparison of TDLAS and cold mirror dew point measure-ment results from −10 ℃ to 30 ℃
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图 12 低露点抽取式测量多次反射筒体设计图和实物
Fig. 12 The multiple reflection cylinder for low dew point extraction measurement（design drawing and physical object）
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图 14 −90 ～−10 ℃露点TDLAS与MBW373测量结果对比
Fig. 14 The comparison of TDLAS and MBW373 measurement results from −90 ℃ to −10 ℃
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图 15 TDLAS低温平台原位露点测量试验示意图
Fig. 15 Schematic diagram of in-situ dew point measurement test of TDLAS low temperature platform
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图 18 抽取式TDLAS与冷镜式露点仪测量结果对比
Fig. 18 Comparison of dew point measurement results between extraction TDLAS and cold mirror dew point meter
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图 19 TDLAS原位测量与抽取式测量结果对比
Fig. 19 Comparison of TDLAS in-situ measurement and extraction measurement results
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图 20 0.3 m低温引导风洞中冷镜式露点仪与TDLAS露点测量结果
Fig. 20 Dew point measurement results of cold mirror dew point instrument and TDLAS in 0.3 m low temperature guide wind tunnel
表 1 选择光谱谱线参数和对应激光器
Table 1 Selection of spectral line parameters and corresponding lasers
激光器 吸收谱线/
(cm−1)线强参数/
(cm−1·molecule−1)露点测量
覆盖范围/ ℃Laser 2–2626 nm 3807 1.585×10−19 −100～−40 Laser 3–1854 nm 5394 2.580×10−20 −95～−25 Laser 1–1383 nm 7223 6.374×10−22 −60～30 7226 8.714×10−21 7228 1.848×10−21 
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表 2 TDLAS与冷镜式露点仪测量（计量）对比
Table 2 Measurement results of TDLAS and cold mirror dew point instrument
设定露点/℃ TDLAS测量/℃ MBW373测量/℃ 偏差/℃ −100 −99.10 −100.00 0.90 −90 −91.10 −91.90 0.80 −80 −79.39 −79.88 0.49 −70 −69.55 −69.85 0.30 −60 −59.15 −59.59 0.44 −50 −50.35 −50.70 0.35 −40 −39.70 −40.10 0.40 −30 −29.93 −30.10 0.17 −20 −19.83 −19.97 0.14 −10 −10.75 −10.66 −0.09 0 −0.75 −0.78 0.03 10 10.36 9.98 0.38 20 20.54 20.19 0.45 30 31.10 30.79 0.31
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