线圈式压阻瞬态高压传感器的设计

Design of Coil Piezoresistive Transient High-Pressure Sensor

针对新概念火炮内膛的温度变化大、振动、冲击及电磁干扰强等环境恶劣的高膛压测试,及现有的高膛压测试技术,尤其是高压传感器所存在的适应能力差的缺陷,提出了一种新结构的线圈式压阻瞬态高压传感器,它包括2个感压线圈和2个补偿线圈,这4个线圈与传感器外壳绝缘,形成半桥(双臂)工作的模式,同时采取多种形式屏蔽技术的联合设计构成抗电磁干扰的屏蔽系统.这种结构不仅可以提高传感器的灵敏度,而且可以通过防护和补偿来抵抗外界各种干扰.试验表明该传感器的非线性误差在高、低、常温状态下均不大于0.3%,重复性误差不大于0.5%.

Aiming at the high pressure environment test of the new concept gun barrel bore with various temperatures, virbrations, collisions, electromagnetic interferences （EMI）, and testing technology at present, especially the poor adaptability of the high pressure sensor, a coil piezoresistive transient highpressure sensor with a new structure was proposed, which included two pressure feeling coils and two compensating coils, they were insulated from the hull of the sensor to form the half bridge working mode （double arms）, and at the same time, the shield system for anti-EMI was built up through the union of many shield designs. This structure could not only improve the sensitivity, but also resist any interferences by the way of protection and compensation. Tests show that the sensor＇ s nonlinearity error is not higher than 0. 3% in high, low and room temperature states,the repeatability error is not higher than 0. 5 %.