A performance comparison between cooled and uncooled infrared detectors for thermoelastic stress analysis
A performance comparison between cooled and uncooled infrared detectors for thermoelastic stress analysis
复制标题
用于热弹性应力分析的冷却和非冷却红外探测器的性能比较
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
N. Street
中科院分区：
文献类型：
--
作者：
N. Rajic;N. Street
本研究比较了几种商用氧化钒微测辐射热计的应力测量灵敏度的科学级冷却锑化铟成像仪。在相同的机械载荷受试者上，在类似条件下对这些装置进行了测试;一个是含有圆孔的单轴载荷板，另一个是代表性的飞机机翼蒙皮试样。示出的微测辐射热计始终优于冷却成像器的扫描持续时间为1500个负载周期或更多，尽管具有噪声等效温度探测率（NETD），劣约2和6之间的因素。这一发现是重要的，在两个方面：它表明，NETD规范只有有限的价值作为热弹性应力分析的灵敏度度量，其次，它证实了微测辐射热计能够提供高保真应力测量的类型，传统上与冷却红外成像仪，通常是更昂贵的收购和更繁琐的使用。
This study compares the stress-measurement sensitivity of several commercially available vanadium-oxide microbolometers to a scientific grade cooled indium antimonide imager. The devices were tested under similar conditions on the same mechanically-loaded subjects; one a uniaxially loaded plate containing a circular hole and the other a representative aircraft wing-skin coupon. The microbolometers are shown to consistently outperform the cooled imager for scan durations of 1500 load cycles or more despite having noise equivalent temperature detectivities (NETD) that were inferior by factors of between approximately 2 and 6. This finding is significant in two respects: it suggests that an NETD specification has only limited value as a sensitivity metric for thermoelastic stress analysis and secondly it confirms that microbolometers are able to furnish high-fidelity stress measurements of a type traditionally associated with cooled infrared imagers which are generally more costly to acquire and more cumbersome to use.