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一、前置放大器及探测器红外成象系统前置放大单元的第一个功能是完成微弱红外信号的低噪声放大。因而要求其增益高,工作稳定,抗干扰能力强,体积小;此外,还应与红外探测器最佳匹配。由于使用的PbSnTe光伏探测器动态电阻在几百欧左右,前放如采用多管并联组态,管子不易配对,而且体积也大,一般采用集成低噪声前放ZN459。虽然其最佳噪声源电阻较低,与探测器动态电阻不匹配,但考虑到它的体积小,抗干扰能力强,使用方便等优点还是合适的。另
First, the preamplifier and detector Infrared imaging system preamplifier unit’s first function is to complete the weak infrared signal of low noise amplification. Thus requiring its high gain, stable work, strong anti-interference ability, small size; In addition, infrared detectors should also be the best match. Due to the use of PbSnTe PV detector dynamic resistance in the hundreds of Europe or so, the first release, such as the use of multi-tube parallel configuration, the tube is not easy to pair, and the volume is large, the general use of integrated low-noise pre-release ZN459. Although its best noise source resistance is low, and the dynamic impedance of the detector does not match, but considering its small size, strong anti-interference ability, easy to use and other advantages are appropriate. another