摘要
研究了非制冷热成像系统功耗产生的主要原因，提出了一种具有低功耗特点的多工作温度热成像系统。从非晶硅焦平面阵列探测器噪声等效温差和探测率的计算公式入手，分析了非晶硅焦平面阵列探测器响应特性与工作温度的关系。数值分析显示，在-40℃～60℃工作温度范围内，非晶硅焦平面阵列探测器具有一致性的响应性能，这为设计多工作温度热成像系统奠定了理论基础。对所设计的多工作温度热成像系统测试结果：在-40℃～60℃环境温度范围内，热电稳定器的功耗小于350mW，噪声等效温差小于120mK，这表明该热成像系统既具有稳定的成像质量，又具有较小的系统功耗。
The reasons why thermal imaging system consumes power were analyzed, and a design scheme of lower power consumption thermal imaging system operating at multiple temperatures was presented. The relation between the response characteristics and operating temperature of α-Si focal plane array detector was studied by means of formulae of its noise equivalent temperature difference （NETD） and detectivity. The numerical analysis shows that the detectivity decreases and NETD increases slightly when the operating temperature rises. This indicates the detector has a uniform response in a wide operating temperature range. A thermal imaging system operating at multiple temperatures was designed according to the analysis. The test results of system show the power consumption of thermoelectric controller is less than 350 mW and NETD is less than 120 mK in the range of - 40 ℃ -- 60 ℃. It shows that the system not only outputs high-quality images but has a lower power consumption.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2008年第8期920-924,共5页
Acta Armamentarii
关键词
信息处理技术
热成像系统
温度特性
噪声等效温差
探测率
information processing technique
thermal imaging system
temperature characteristic
noise equivalent temperature difference
detectivity
