CGR3

CGR3的详细介绍

CGR3长波辐射计可测量波长大于4μm的红外辐射（FIR），硅玻璃罩上的内置滤光光栅可以阻挡所有短波太阳辐射。内置的温度传感器能演算向下的长波辐射。
    Kipp & Zonen 的长波辐射计可长时间在任何天气状况下良好使用。带有防水插头的信号电缆便于安装维护。镶嵌其上的白色太阳遮挡环，使传感器热化效应降到最低。
    CGR3长波辐射计设计紧凑、材料坚固、耐用。CGR3提供一个和入射红外辐射强度（FIR）成比例的电压信号，数据代表了仪器和整个半球之间由于CGR3在户外通过CGR4校正的辐射交换。CGR4可以提供180度的测量视角，测量出的数据表明了仪器内部和整个半球面的辐射交换。CGR3有一个内置的（不可替换的）干燥筒，需要适当维护。
    The CGR 3 is a pyrgeometer, designed for meteorological measurements of downward atmospheric long wave radiation. The CGR 3 provides a voltage that is proportional to the net radiation in the far infrared (FIR). By calculation, downward atmospheric long wave radiation is derived. For this reason CGR 3 embodies a temperature sensor. The CGR 3 uses a specially designed silicon window. On the inside a solar-blind filter blocks solar radiation. The CGR 3 data represents the radiation exchange within the whole hemisphere. This is because the reference CGR 3 is calibrated outdoors with respect to a reference CG 4, which has a 180 degrees field of view.

The CGR 3 has been improved in many points over the CG 3, based on customer feedback and years of experience. The CGR 3 has a newly designed sunscreen that covers both body and connector to reduce the instrument temperature and further increase the accuracy. The design of the instruments accounts for the use of existing Kipp & Zonen mounting plates.

The base of the instruments contains the mounting holes, a spirit level and levelling feet for exact levelling. For ease of mounting, exchange and recalibration the instruments have a waterproof connector. The standard supplied 10 m. shielded cable has the waterproof sealed counterpart connector. The improved temperature dependency and directional response make these instruments the ideal choice for meteorological and agricultural applications.

Product Specification
Spectral range 4500 to 42000 nm
Sensitivity 5 to 7 μV/W/m2
Response time < 18 s
Window heating offset < 15 W/m2
Zero offset B < 4 W/m2
Temperature dependence of sensitivity (-10 oC to +40 oC) < 5 %
Operating temperature range -40 to +80 °C
Net irradiance range -250 to +250 W/m2
Field of view 150 °
Non-linearity < 1 %