【摘要】 用激光照射掺有碘分子的流场，感应的碘分子荧光包含着流动参数如速度、压强、温度和密度的信息，可用其来对这些参数进行测量。但荧光信号通常很弱，在没有合适滤波器的情况下，测量的信噪比是差的。为了去掉作为噪音的散射的激光和背景光，设计和制造了长波通滤波器，它们具有高质量性能，相应的测量有好的信噪比。更多还原

【Abstract】 Flow fields seeded with iodine molecule are irradiated by laser,the induced fluorescence of iodine molecule involving information of flow parameters:Velocity,pressure,temperature and density,can be used to measure these parameters,The signal of fluorescence is relatively weaker,without an appropriate filter the measurements are of bad ratio of signal to noise.In order to block scattered laser light and the light of background as noise,the long pass filter had b3en designed and developed,being of high quality.Therefore the corresponding measurements would be of good ratio of signal to noise.更多还原