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采用IOTS 型半导体感温元件与气流滞止罩组合成测量高速气流总温的总温探针(TTPS).配以稳定度为5×10~(-5)的恒流源,在t=30～90℃的温度范围内,其最小二乘法非线性误差小于0.2℃,即最小二乘法线性度为0.2%;重复性为0.1%;灵敏度约为2mV/℃;在马赫数M=0.3～0.75范围内,动温校正系数β≥0.992,恢复系数γ=0.91～0.98.试验结果证明,国产半导体感温元件制作的TTPS 是可以代替热偶总温探针(TTPT)的.与TTPT 相此,不需冷端温度补偿,使用方便,并可避免由于补偿不完善而存在的误差;它比TTPT 的灵敏度高50倍,如与微机配合组成数据自动采集系统,可以降低对放大器性能的要求.
A total temperature probe (TTPS) was used to measure the total temperature of the high-speed airflow by using the IOTS-type semiconductor temperature sensing element and the air-flow stagnation shield. With a constant current source with a stability of 5 × 10 -5, at t = 30 ~ 90 ℃ temperature range, the least squares nonlinear error less than 0.2 ℃, that is, the least squares linearity of 0.2%; repeatability of 0.1%; sensitivity of about 2mV / ℃; Mach number M = 0.3 ~ 0.75 , The temperature coefficient of thermal correction β≥0.992 and the recovery coefficient γ = 0.91 ~ 0.98.The results show that TTPS produced by the domestic semiconductor temperature sensing element can replace the thermocouple total temperature probe (TTPT) No cold junction temperature compensation, easy to use, and to avoid the error due to imperfect compensation; it is 50 times higher than the sensitivity of TTPT, such as with the computer with automatic data acquisition system composed of the composition, can reduce the performance requirements of the amplifier.