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热释电摄象管(PEV)之所以受到注意,是由于它是比较便宜、具有中等性能的红外(8～14μm)成象器件。象任何一种成象器件那样,在热释电摄象管中,决定性能的参数是灵敏度、噪声和分辨率。非网状靶面热释电摄象管的分辨率受到两个方面的限制:电子束放电滞后和靶面的横向热扩散。电子束放电滞后的结果使信号不能完全读出。若以平移模式工作,在高空间频率下,这就会引起信息的损失。另一方面,在高空间频率下,由于热象区到冷象区的热扩
The reason why a pyroelectric video tube (PEV) is noticed is because it is a relatively inexpensive, mid-range infrared (8-14 μm) imaging device. Like any imaging device, the parameters that determine performance in a pyroelectric image tube are sensitivity, noise, and resolution. The resolution of a non-mesh target pyroelectric image tube is limited in two ways: electron beam discharge hysteresis and lateral thermal diffusion of the target surface. As a result of the electron beam discharge hysteresis, the signal can not be read completely. If working in panning mode, this causes loss of information at high spatial frequencies. On the other hand, at high spatial frequencies, thermal expansion due to the thermal image area to the cold image area