The Quasi-δ Calibration Technology Research Of Presssure Sensor

In order to solve the problem of calibrating the pressure sensor with static methods indynamic stress tests，this paper retrieve the general situation of the development of dynamicpressure calibration technology both at home and abroad, analyze and compare the principleof main types of dynamic calibration methods at present，On this basis we do somedevelopment to dispose the existing problems of the Quasi-δ calibration technology. In thispaper, we start from the analysis of pressure sensor damage reason in traditional quasi-δsensor calibration experiment, increase the static pressure device to protect the calibratedpressure sensor. This high static pressure superpose a narrow pulse pressure which is createdby the high-speed bullet impacting the Hopkinson bar can become a larger and richFrequency Quasi-δ pressure signal. Then we use this improved calibration device completethe dynamic calibration experiment of Kistler6215piezoelectric sensor. The main innovationof this paper have:(1) By using the Simulink establish the sensor model and simulate the response of sensorto prove the Quasi-δ calibration technology with preset static pressure is feasible in theory.(2) On the basis of the one-dimensional stress wave, this paper analyze the dynamicprocess of the bullet impact Hopkinson bar and the influence of various parameters on thestress wave propagation by the use of Finite Element Analysis. according to these analysis，do some improvement and adjustment to related part of the Quasi-δ Signal Generator.(3) Based on the good piezoresistive effect of the manganin alloy, this paper design adesign a high-frequency response of the sensor and its supporting circuitry used to measurethe excitation signal，in order to meet the need of Quasi-δ signal acquisition.The experiment results show that: the improved calibration device can effectivelyprotect the calibrated sensor and obtain the dynamic characteristic of the sensor in the entire frequency range. Because of the lowest frequency of Quasi-δ calibration technology coulddive to zero frequency, this method could back to the country’s top pressure standard at zerofrequency (static situation),so as to realize the traceability of the pressure sensor dynamiccalibration.