关键词: 涡轮喷气发动机;排气火焰;温度传感器;放大器

Abstract: The temperature sensor made of high temperature alloy GH30 has a groud-contracted metal-sheathed thermocouple (MST) in diameter of 1. 5mm as its temperature measuring element. The upper temperature limit of this kind of MST is 900℃ for short-time use and 800℃ for long-time use. Its time constant is less than 0. 3s and it operates reliably in engine under vibration and hot aerodynamical conditions. Its signal amplifier is of differential input type and available for output signal of ground-contacted thermocouples. The amplifier also has great anti-interference ability, compact structure and good electrical performances. For this system, stable performances and reliable operation have been proved in flight test.

Key words: Turbojet engine;Exhaust flame;Temperature sensor;Amplifier