高精度采集电路是构成高精度红外热像仪的重要组成部分。在简单介绍红外热成像 系统基本原理的基础上，给出了用法国ULIS公司的384×288元非致冷红外焦平面阵列探测器设计的红外 成像系统的硬件构成。该系统采用CPLD复杂可编程逻辑器件作为采集与驱动时序电路的核心控制芯片，以VSP2566作 为采集芯片，把探测器输出的模拟信号转换为16位数字信号，然后将其送至数字信号处理器(DSP)作进一步处理和显示。与直 接采用探测器的12位数字输出相比，该设计具有较高的测温精度和成像质量。

A high precision acquisition circuit is an important component of a high precision infrared thermal imager. The basic principle of an infrared thermal imaging system is described in brief. The hardware structure of an infrared imaging system using a 384×288-pixel uncooled infrared focal plane array produced by ULIS company is given. The system uses a Complex Programmable Logic Device (CPLD) as the core control chip of its acquisition and driving circuit and uses a VSP2566 as its acquisition chip. The acquisition chip converts the analog signal output from the detector into a 16-bit digital signal and then sends the digital signal to a Digital Signal Processor (DSP) for further processing and displaying. Compared with the scheme which directly uses the 12-bit digital output of the detector, this design has higher temperature measurement accuracy and higher imaging quality.