Design of a measurement performance testing system for fiber grating pressure instruments in high-temperature working condition

Pressure is one of the critical parameters in industrial production, and the accuracy of pressure detection in certain critical scenarios is a necessary condition to ensure safety. At present, the most widely used electrical pressure sensors include piezoresistive, piezoelectric and capacitive sensors. In recent years, fiber grating sensors have been widely used in high temperature environments. By analyzing the existing technical regulations for measurement performance testing of pressure instruments, points out a problem: testing often overlooks actual working conditions, it is difficult to reflect the performance of the medium pressure instrument. A test method is proposed to simulate the measurement performance test of the pressure instruments under high-temperature conditions, so that the test conditions are as consistent as possible with the actual working conditions; In order to fully understand the temperature of each point in the working environment, the infrared imaging sensor is used to measure the temperature field, form the heat map, and monitor the temperature distribution of the pressure gauge in real time. The composition of the test system and the function of each part are introduced, and the working process of the test system is described in detail. A pressure instrument with an accuracy grade of 0.5 is used as the test subject to verify the functionality of the testing system. The working condition are as follows: the pressure measurement range is 0 to 6MPa, the measurement medium temperature range is 50°C to 500°C, and the ambient temperature range is 25°C to 85°C. The results show that the test system is capable of assessing the measurement performance of the pressure instrument at simulated working conditions by combining test parameters according to needs. When compared to existing technical regulations, the test outcomes are more informative and referential at high-temperature conditions. The system can evaluate the performance of various pressure measuring instruments, including Electrical pressure instrument.