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燃烧过程的准确、实时诊断对研究燃烧机理、提高燃烧效率、降低污染物排放等至关重要。简要介绍了可调谐二极管激光吸收光谱(TDLAS)技术的测温原理,通过选择水在1397nm附近的两条邻近吸收线,运用多功能数据采集卡对二极管激光器进行控制和信号采集,实现了TDLAS技术波长扫描直接吸收法对瞬态超声速流场温度的测量,获得了瞬态超声速流场温度随喷流时间的演化过程,测量重复频率为1kHz。
Accurate, real-time diagnosis of the combustion process is crucial to studying combustion mechanisms, increasing combustion efficiency and reducing pollutant emissions. This paper briefly introduces the temperature measurement principle of tunable diode laser absorption spectroscopy (TDLAS). By selecting two adjacent absorption lines near 1397nm and using multi-function data acquisition card to control diode laser and signal acquisition, TDLAS technology Wavelength scanning direct absorption method was used to measure the transient supersonic flow field temperature. The evolution of transient supersonic flow field temperature with jet flow time was obtained. The measurement repetition frequency was 1 kHz.