Wang Ruifeng, Huang Tianxu, Mei Jiaoxu, Wang Guishi, Liu Kun, Kan Ruifeng, Chen Weidong, Gao Xiaoming
Opt Lett. 2024 Feb 15;49(4):1033-1036. doi: 10.1364/OL.506204.
Pressure is an important parameter in assessing combustion performance that is typically measured using contact sensors. However, contact sensors usually disturb combustion flows and suffer from the temperature tolerance limit of sensor materials. In this Letter, an innovative noncontact two-color pressure sensing method based on tunable diode laser absorption spectroscopy (TDLAS) is proposed. This makes it possible to measure pressure at high temperature environments for combustion diagnostics. The proposed method uses the linear combination of the collision-broadened linewidths of two HO absorption lines near 1343 and 1392 nm to measure the pressure. The feasibility and performance of such method have been demonstrated by measuring pressures from 1 to 5 bars at temperatures up to 1300 K with a laser wavelength scanning rate of 20 kHz. Measurement errors were found to be within 3%. Compared to previously reported TDLAS pressure sensors, this method is free from the influence of concentration and can also be combined with the existing two-color TDLAS thermometry to realize a fast, on line, and multi-parameter measurement in combustion diagnostics.
压力是评估燃烧性能的一个重要参数，通常使用接触式传感器进行测量。然而，接触式传感器通常会干扰燃烧流，并且受到传感器材料的温度耐受极限的影响。在本信函中，提出了一种基于可调谐二极管激光吸收光谱法（TDLAS）的创新型非接触式双色压力传感方法。这使得在高温环境下测量压力以用于燃烧诊断成为可能。所提出的方法利用1343和1392 nm附近两条羟基（OH）吸收线的碰撞增宽线宽的线性组合来测量压力。通过在高达1300 K的温度下以20 kHz的激光波长扫描速率测量1至5巴的压力，证明了该方法的可行性和性能。发现测量误差在3%以内。与先前报道的TDLAS压力传感器相比，该方法不受浓度影响，还可与现有的双色TDLAS测温法相结合，以实现燃烧诊断中的快速、在线和多参数测量。
