A laser induced phosphorescence non-contact test system based on the phosphorescence intensity ratio method was established for the non-contact online temperature field monitoring of high temperature solid surface such as hot end parts of aero-engine. The temperature-sensitive phosphor Y3Al 5O12:Dy was prepared by sol-gel method, and the temperature sensitive characteristics of its phosphorescence spectrum were verified. The effect of ultraviolet pulse laser energy and intensified charge-coupled device camera detection delay on the captured phosphorescence signal intensity was investigated. On this basis, a laser induced phosphorescence non-contact temperature measurement system was designed and calibrated in the range of 400~1 700 ℃, achieving a measurement error of less than 3% below 1 500 ℃. The temperature measurement system was applied to the surface temperature field measurement of a high temperature solid wall subject to flame washout. The results show that the measured temperature is in good agreement with the temperature measured by the embedded thermocouple, which verifies the feasibility of applying the laser induced phosphorescence technology to the surface temperature field measurement of hot end parts of the aero-engine with a wide temperature range, fast response and high precision.
HUANG et al. (Sun,) studied this question.