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为了设计性能优良的红外系统,必须研究红外辐射在大气中的传输规律。本文介绍了一种星载近红外测量用双通道交流辐射计的有关设计和研制情况。2.2μm为大气窗口,2.7μm是大气吸收带,又是硫化铅探测器的峰值响应波长。近红外辐射计选取了这两个光谱波段,对这两个波段的地气背景红外辐射随地理位置和时间变化进行测量。仪器的光学系统用于束聚辐射通量,并将其传到探测器上,使视场限制在全角2°左右。在硫化铅探测器的前面放置一块0.05μm半功率宽带干涉滤光片,其中心波长在2.2μm和2.7μm处。在探测器前面,用一个旋转调制盘斩断光能,将地气辐射变为交流信号。交流信号经前置放大后馈入具有3∶1动态范围的对数放大器,然后再将交流信号变为直流信号馈送至
In order to design a good infrared system, we must study the infrared radiation transmission in the atmosphere. This article describes the design and development of a dual-channel AC radiometer for near-infrared spaceborne measurements. 2.2μm is the atmospheric window, 2.7μm is the atmospheric absorption band, and it is also the peak response wavelength of the lead sulfide detector. Near-infrared radiometer selected the two spectral bands, the two bands of ground background infrared radiation with the geographical location and time changes were measured. The optical system of the instrument is used to bundle the radiant flux and transmit it to the detector so that the field of view is limited to a full angle of about 2 °. In front of the lead sulfide detector placed a 0.05μm half-power broadband interference filter, the center wavelength of 2.2μm and 2.7μm. In front of the detector, a rotating modulation plate cut off the light energy, the ground gas radiation into AC signals. The pre-amplified AC signal is fed into a logarithmic amplifier with a dynamic range of 3: 1, which is then fed into a DC signal