微压力弹簧性能检测仪双闭环控制与误差分析  

Dual-loop Control and Error Analysis of Performance Detector of Micro-pressure Springs

作　　者：王亭岭[1] 熊军华[1] 陈建明[1] 赵明明[1] 

机构地区：[1]华北水利水电学院电力学院,河南郑州450011

出　　处：《仪表技术与传感器》2013年第7期35-37,41,共4页Instrument Technique and Sensor

摘　　要：电感传感器中对称弹簧的性能是影响其测量精度的主要因素。微压力弹簧性能检测仪采用双闭环控制来减小步进电机失步与导轨丝杠间隙带来的误差,精确测量出弹簧在弹性范围内任意位置所受到的弹力值及倔强系数。主控单元选用16位低功耗微控制器MSP430F149提高响应速度,选择高精度24位模/数转换器CS5532提高压力采集电路的分辨率,并采用去极值平均滤波算法提高压力测量精度。实验测得,检测仪测量的位移误差小于2μm,压力误差小于1 mgf(1 kgf=9.81N).The performance of the symmetrical spring in the inductance sensor is the main factor to affect the me/tsurement accuracy. In the detector of micro-pressure spring, dual closed - loop control was used to reduce the error caused by losing synchroni- zation of the stepper motor and the guide screw gap. The detector could accurately measure the stiffness and the elastic value of the spring in any position among the elastic range. The main control unit selected MSP430F149,1ow-power microcontrollers, to improve response time, and used CS5532, high-precision A/D converter, to raise the resolution of data acquisition circuit. The extreme value filtering algorithm was chosen to improve the accuracy of pressure measurement. The experimental results show the displacement er- ror is 2μm,and the pressure error is 1 mgf.

关 键 词：电感传感器 弹簧劲度系数 双闭环控制 MSP430F149 CS5532 

分 类 号：TH82[机械工程—仪器科学与技术]