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英国Sira有限公司是一家专门生产科学和工业仪器和控制设备的单位,它所生产的热成像测试设备具有可变温差靶标,可以测量最小可分辨温差(MRTD)、最小可探测温差(MDTD)、信号传递函数(SiTF)和调制传递函数(MTF)。除靶标外,它还有可变温度源、微光度计、温度传感器、电子系统和遥控系统。微光度计是用于测量SiTF和MTF的。该公司还有一辐射计,用于对靶标的有效温差定标,这样就可考虑辐射源发射率、平行光管反射率等因素。靶标有两种型号。在简单的一种中,靶标板(有一个或多个靶标)在变温源前每次只装一块,所用设备可以人工线装置的光轴转动靶标板,以便改变靶标的定向。在较复杂的一种中,转架中装有五个靶标板,
Sira, UK, a unit specializing in the production of scientific and industrial instrumentation and control equipment, produces thermal imaging test equipment with a variable temperature target that measures the minimum resolvable temperature difference (MRTD), the minimum detectable temperature difference (MDTD) Signal Transfer Function (SiTF) and Modulation Transfer Function (MTF). In addition to the target, it has variable temperature sources, micrometometers, temperature sensors, electronic systems and remote control systems. Micrometer is used to measure SiTF and MTF. The company also has a radiometer to calibrate the effective temperature difference of the target, so that the emissivity of the radiation source and the reflectivity of the collimator can be taken into consideration. There are two types of targets. In the simplest case, the target plate (with one or more targets) is loaded one time at a time with a variable temperature source and the equipment used can rotate the target plate with the optical axis of the artificial line unit in order to change the orientation of the target. In the more complex one, the turret is equipped with five target boards,