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首页> 外文期刊>Applied optics >Diode-laser absorption sensor for line-of-sight gas temperature distributions
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Diode-laser absorption sensor for line-of-sight gas temperature distributions

机译：二极管激光吸收传感器，用于视线范围内的气体温度分布

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摘要

Line-of-sight diode-laser absorption techniques have been extended to enable temperature measurements in nonuniform-property flows. The sensing strategy for such flows exploits the broad wavelength-scanning abilities (>1.7 nm≈30 cm~(-1)) of a vertical cavity surface-emitting laser (VCSEL) to interrogate multiple absorption transitions along a single line of sight. To demonstrate the strategy, a VCSEL-based sensor for oxygen gas temperature distributions was developed. A VCSEL beam was directed through paths containing atmospheric-pressure air with known (and relatively simple) temperature distributions in the 200-700 K range. The VCSEL was scanned over ten transitions in the R branch of the oxygen A band near 760 nm and optionally over six transitions in the P branch. Temperature distribution information can be inferred from these scans because the line strength of each probed transition has a unique temperature dependence; the measurement accuracy and resolution depend on the details of this temperature dependence and on the total number of lines scanned. The performance of the sensing strategy can be optimized and predicted theoretically. Because the sensor exhibits a fast time response (～30 ms) and can be adapted to probe a variety of species over a range of temperatures and pressures, it shows promise for industrial application.
机译：视线二极管激光吸收技术已得到扩展，可以在非均匀性能流中进行温度测量。这种流的传感策略利用垂直腔表面发射激光器（VCSEL）的宽波长扫描能力（> 1.7nm≈30cm〜（-1））来询问沿单个视线的多个吸收跃迁。为了演示该策略，开发了一种基于VCSEL的氧气温度分布传感器。 VCSEL光束被引导通过包含大气压力的路径，该路径具有已知（相对简单）的温度分布在200-700 K范围内。在760 nm附近的氧气A谱带的R分支中的十个跃迁上扫描VCSEL，并在P分支中任选地在六个跃迁上扫描VCSEL。从这些扫描可以推断出温度分布信息，因为每个探测到的跃迁的线强度都具有独特的温度依赖性;测量精度和分辨率取决于温度依赖性的细节以及扫描的总行数。感测策略的性能可以在理论上进行优化和预测。由于该传感器具有快速的响应时间（约30 ms），并且可以在一定的温度和压力范围内探测各种物种，因此具有工业应用前景。

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