In routine existence, the utilization of vehicles is increasing in a enormous way among the people. This leads to the production of vehicles in a high rate. The engine parts used for the proper functioning of the vehicles needs a extreme care. These parts are subjected to extreme load and stress. As the engine produces work used to move the vehicles due to the combustion of fuel taking place inside the parts, they are subjected to high thermal stress (or) high temperature. The temperature at which the part elongates should be determined before the parts are incorporated inside the engine. The parts can be subjected to heat flow equal to one that is produced during combustion and the temperature gradient on the surface of the engine part can be calibrated. The present work concentrates on the experimental recognition of the temperature gradient on the surface of a V-notch specimen. The experimental recognition has been done by the utilization of a special paint which changes its color as subjected to temperature rise. The colors obtained from the experimental observation has been verified by two color identification methods. The color identification methods and the experimental results were hold in good agreement.

在人们的日常生活中，车辆的使用正在以极大的方式增加。这导致高产量的车辆。用于车辆正常运行的发动机零件需要格外小心。这些零件承受极大的载荷和压力。由于零件内部发生的燃料燃烧，导致发动机产生用于使车辆行驶的功，因此它们承受高的热应力（或）高温。在将零件装入发动机之前，应确定零件伸长的温度。零件可以承受与燃烧期间产生的热量相等的热量，并且可以校准发动机零件表面的温度梯度。目前的工作集中在对V型缺口试样表面温度梯度的实验识别上。通过使用一种特殊的涂料来完成实验识别，该涂料会随着温度的升高而改变其颜色。从实验观察中获得的颜色已经通过两种颜色识别方法进行了验证。颜色识别方法与实验结果吻合良好。