高压传感器在高静压下的动态校准方法  

The Dynamic Calibration Method of High-Pressure Transducer under High-Static Pressure

作　　者：张瑜[1,2] 裴东兴[1,2] 祖静[2] 

机构地区：[1]中北大学信息与通信工程学院,太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,太原030051

出　　处：《传感技术学报》2011年第8期1146-1150,共5页Chinese Journal of Sensors and Actuators

摘　　要：提出了一种校准高压传感器频响特性的方法,动态校准系统主要由甘油油腔、霍普金森杆、气枪、应变片、电荷放大器、活塞式压力计和数据采集系统等组成。校准时先利用活塞式压力计在封闭式油腔中产生高静压,高静压作用于被校准的压力传感器。气枪发射子弹,子弹撞击霍普金森杆产生近似于冲激函数的窄脉冲应力波,应力波通过甘油传播并激励传感器,数据采集系统同时采集激励信号和传感器的输出信号,最后计算出被校传感器的频响特性。分析了瞬态信号的脉宽与频率校准范围的关系。该校准方法是高压测试系统动态校准的理想方法,实现了高压下压力传感器的动态校准,可校准的下限频率严格地达到零频,为动态高压测试提供有效的计量手段。A dynamic calibration method of frequency response characteristics of high-pressure sensor is proposed.The calibration system mainly consists of an oil chamber full of glycerin,a Hopkinson bar,an air gun with its fire associated apparatuses,a strain gauge,a charge amplifier,a piston gauge and a data acquisition system.In process of the calibration,as a high hydrostatic pressure is applied to the sensor by a piston gauge and a enclosed oil chamber,the air gun shoots a bullet to strike Hopkinson bar that a stress wave will be formed.This stress wave is a narrow pulse signal for exciting sensor,i.e.quasi-δ function.The stress wave propagation through glycerin and excited the sensor.The high precision data acquisition system collected the excited signal and sensor outputs signal and calculated the frequency response of the sensor.The relation between pulse-width of transient signal and calibrating frequency range was analyzed.This calibration method is an ideal method for high pressure sensor,it can realize the low limit frequency of the calibrated frequency range strictly reaches to the frequency of zero Hertz;and it also can offer effective metering means for dynamic high pressure measurement.

关 键 词：高压 压力传感器 动态校准 频率响应 准δ函数 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]