摘要
提高测辐射热计热成像探测器性能的主要目标是提高探测器输出信号的信噪比.本文讨论了测辐射热计热成像探测器的主要噪声源,指出噪声主要来自探测器材料及读出电路两大部分,而两者的主要噪声形式均为Johnson噪声、1/f噪声和热起伏噪声,对于读出电路,开关热噪声是另外一个随机噪声源.从读出电路的角度出发讨论了提高探测器信噪比的途径,降低以1/f噪声为主的固定模式噪声是提高探测器信噪比的有效手段.在采用相关双采样技术后,可以显著降低探测器在500 Hz以下频率范围内的固定模式噪声.
To improve the performance of uncooled focal plane array （UFPA）, it is desired to improve the signal to noise ratio （SNR） of the devices. Among the noise sources of the devices, major sources are Johnson noise, 1/f noise and thermal fluctuation noise which are derived from the sensing material and signal readout circuit （ROIC） of the devices. There is a KTC random noise coming from the readout circuit. An effective way to increase the SNR is to reduce the fixed pattern noise. For UFPA, it is important to reduce the 1/f noise from the ROIC. A correlated double sampling （CDS） structure is applied to reduce the fixed pattern noise in the frequency range below 500 Hz.
出处
《西安工业大学学报》
CAS
2006年第6期560-562,共3页
Journal of Xi’an Technological University
基金
总装备部预研基金
关键词
相关双采样
信噪比
固定模式噪声
读出电路
correlated double sampling
signal noise ratio
fixed pattern noise
readout circuit
