Philippe L C, Hanson R K
Opt Lett. 1991 Dec 15;16(24):2002-4. doi: 10.1364/ol.16.002002.
We present a laser-based concept for an air mass flux sensor based on the simultaneous measurement of density and velocity of O(2). The sensor uses wavelength modulation absorption spectroscopy at 10 MHz of an AlGaAs laser diode in the b(1)Sigma(g)(+)(v' = 0)-X(3)Sigma(g)(-)(v'' = 0) system of O(2), combined with second-harmonic detection. The apparatus is demonstrated on a high-speed oxygen flow generated behind the incident shock wave in a shock tube. The measurement time is 0.5 ms for typical absorption levels of 0.5%.
我们提出了一种基于激光的空气质量通量传感器概念，该传感器基于对氧气（O₂）密度和速度的同时测量。该传感器在氧气的b(¹Σg⁺(v' = 0)-X³Σg⁻(v'' = 0)系统中，使用10 MHz的AlGaAs激光二极管进行波长调制吸收光谱，并结合二次谐波检测。该装置在激波管中入射激波后方产生的高速氧气流上进行了演示。对于典型吸收率为0.5%的情况，测量时间为0.5毫秒。
