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可调谐半导体激光吸收光谱技术作为一种稳健的非接触测量技术,在燃烧和推进等恶劣流场的诊断中具有广泛的应用。开发了一种基于水吸收的可调谐半导体激光传感器,用于同时测量超声速地面测试设备的温度和速度,应用扫描波长吸收谱和免标定的波长调制谱可实现绝对测量。传感器在2.5kg/s质量流量的直连式超燃试验台上开展了工程试验研究,试验马赫数为2.0,总压为5.3～5.7atm(1atm=1.01325×105 Pa),总温为1100K～1700K,速度和温度的测量结果与模型预测值具有较好的一致性,验证了传感器设计的有效性,为工程应用提供了有力的技术支撑。
Tunable semiconductor laser absorption spectroscopy, as a robust non-contact measurement technique, has wide applications in the diagnosis of severe flow fields such as combustion and propulsion. A tunable semiconductor laser sensor based on water absorption was developed to simultaneously measure the temperature and velocity of supersonic ground test equipment. The absolute measurement can be achieved using the scanning wavelength absorption spectrum and the uncalibrated wavelength modulation spectrum. The sensor was tested on a 2.5kg / s direct-flow direct injection test bed. The test Mach number was 2.0 and the total pressure was 5.3 ~ 5.7atm (1atm = 1.01325 × 105 Pa). The total temperature was 1100K ~ 1700K, the measured results of velocity and temperature are in good agreement with the predicted values of the model, which verify the effectiveness of the sensor design and provide powerful technical support for engineering application.