铋层状与铌酸锂复合压电陶瓷传感器的温度特性

Temperature Characteristics of a Bi_4Ti_3O_(12)-LiNbO_3 Compound Piezoelectric Ceramic Sensor

铋层状结构铁电体具有良好的机械性能和较高的居里温度Tc,因而被广泛用作高温传感器的敏感器件.高温压电传感器在核能、燃气轮机、航空、舰船发动机以及需要测量高温振动和压力的场合有着极大需求,但目前国内外用于这些领域的基于铋层状压电传感器在高温时的灵敏度与常温时比较,漂移率达到10%~20%,无法满足满温度范围内（-50~450℃）传感器的灵敏度温漂的要求（≤±5%）.因此,本文研究了一种铋层状与铌酸锂复合的压电陶瓷传感器,进行了传感器温度特性理论分析,建立了相应数学模型,并进行实验验证.测试结果表明,这种新型复合式压电陶瓷传感器满温度量程灵敏度漂移小于±3%,具有优异的温度特性,无需采用软件修正测量偏差,能满足美国航空无线电技术委员会（RTCA）制定的DO160要求,可直接用于高温环境的温度精密测量.

Bi4 Ti3 O12 has been wildly used on high temperature sensor due to its excellent mechanical performance and high curie temperature.There is a lot of the demand for high temperature sensors in the industries, such as nuclear energy, turbo engine of avia- tion and ship as well as other high temperature testing applications. However, comparison with working at room temperature, the sensor based on Bi4 Tia O12 material has a sensitivity shift of 10 %-20 % when in the high temperature, and fails to meet the require- ment of ≤± 5 % in the temperature range from -50 ℃ to 450 ℃ .In order to address this problem, a new type of structural composite piezoelectric sensor that based on Bi4 Ti3 O12-LiNbOa is studied and developed.In this paper, the main research work are presented, which the temperature characteristic is analyzed theoretically, and the mathematical model is established and the experimental study is carried out for the sensor.h has shown from the testing results, this new type of structural composite piezoelectric sensor has an extraordinarily good temperature characteristic and has a sensitivity shift of full temperature range less than ± 30% .Moreover,it does not require software to correct measurement deviation.It can be directly used in high temperature environment and is able to meet DO160 regulatory requirement of Radio Technical Commission for Aeronautics （RTCA）.Therefore,this new type of sensor has the broad application prospects.