Abstract: A Fourier-transform infrared (FT-IR) spectrophotometer system is used to measure the transmittance of infrared band-pass filters as a function of wavelength, temperature, and beam geometry. Measurements are performed using an f/4 beam geometry at normal incidence, or a nearly collimated geometry with variable angle of incidence. Blocking filters are used to expand the dynamic range of the out-of-band measurement to transmittances as low as 10$+$MIN@6$/ with 4 cm$+$MIN@1$/ resolution. !5
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机译：摘要：使用傅立叶变换红外（FT-IR）分光光度计系统测量红外带通滤光片的透射率，该透射率是波长，温度和光束几何形状的函数。使用法向入射的f / 4光束几何形状或入射角可变的准直几何形状进行测量。阻塞滤波器用于将带外测量的动态范围扩展至分辨率为4 cm $ + $ MIN @ 1 $ /的低至10 $ + $ MIN @ 6 $ /的透射率。 ！5
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