多色非接触式光纤测温系统的研究

Research on Non-contact Optical Fiber Temperature Sensing System by Colorimetry

以光纤纤芯中热点本身所产生的黑体辐射现象为基础,探测来自高温不透明物体表面的热辐射。通过把光纤本身作为待测温度的黑体腔,在无需外加光源的情况下,提出了一种温度传感的方法,其显著特点在于适合高温、高压、高速运转及高腐蚀等恶劣环境下物体的温度测量。分析了如何通过对被测物体实际环境的充分考虑选出合适的多色波长,并通过优化处理,给出了不同波长下光谱辐射出射度之比与被测物体温度的关系式。最后,设计了多色光纤温度传感系统,其中主要是利用光纤传输和光电转换得到输出信号的比值,从而测量到被测物体的温度。

This article explores the thermal radiation from surface of the opaque body in high temperature on the basis of blackbody radiation produced by the hot spot of fiber core.Taking the optical fiber as the blackbody cavity to be measured,it presents a temperature sensing method without the need to add light source.The typical feature of this system is that it can be used to measure the temperature of the objects under harsh environment with high temperature,high pressure,high speed operation and high corrosion.It analysed how to select multicolor wavelength with the consideration of the practical environment in which the object is to be measured and presents the relation formula of the ratio of spectral radiant intensities under different wavelength and the temperature of the measured object through the optimized processing.Finally the optical fiber temperature sensing system by colorimetry was designed to measure the temperature of the measured object with the ratio of the output signals got from the optical fiber transmission and photoelectric conversion.