红外探头是热轴探测系统中的关键设备,它的质量好坏,直接影响到探测的精度。目前各局使用的探头,大都是采用光栅作为调制器,以光栅作为背景温度的参考点。这种方法目前已普及使用。使用光栅作为调制器的一个突出优点是解决了背景温度参考点,在探头对每个轴箱进行扫描时,它是以光栅的温度作为基准点。由于光栅的温度相对来讲是比较稳定的(它只随环境温度而变),因此在对整个列车进行探测时,可 Infrared probe is a hot shaft detection system in the key equipment, its quality is good or bad, a direct impact on the detection accuracy. At present, the probes used by each bureau mostly use the grating as a modulator and the grating as the reference point of the background temperature. This method is now widely used. An outstanding advantage of using a grating as a modulator is the solution to the background temperature reference point, which is referenced to the temperature of the grating when the probe scans each carriage. As the temperature of the grating is relatively stable (it only changes with the ambient temperature), so when the entire train is probed