Application of high sensitive laser absorption spectroscopy to Arc heated wind tunnel

空腔增强吸收光谱已应用于电弧加热风洞。这个设施是在中央航空航天中心开发的，目的是模拟从太空返回时的环境。然而，由于冷却水和真空系统的机械振动，激光传输信号变差，无法获得吸收信号。因此，通过振动由腔体组成的高反射率反射镜，研究了机械振动对CEAS的影响。研究结果表明，由于机械振动的影响，传感器的灵敏度和信噪比下降。

Cavity Enhanced Absorption Spectroscopy has been applied to the Arc heated wind tunnel. This facility has been developed in Chofu aerospace center in order to simulate the environment during reentry from the space. However, because of the mechanical vibration from the cooling water and vacuum system, the transmitted laser signal got worse and absorption signals could not be obtained. Therefore, influence of mechanical vibration on CEAS has been studied by vibrating the high-reflectance mirror which consisted of the cavity. As a result, it was investigated that because of the mechanical vibration, the sensitivity and signal-to-noise ratio were degraded.