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Hou Z.,National Key Laboratory for Electronic Measurement and Technology | Hou Z.,North University of China | Wu Y.,National Key Laboratory for Electronic Measurement and Technology | Wu Y.,North University of China | And 2 more authors.
Sensors and Transducers | Year: 2013

Acceleration, an important dynamic parameter, is used widely in researching on aircraft mechanical structure fatigue, shock and so on, as it is in proportion to force and load. Piezoelectric sensor is a kind of sensor that most widely used in measuring acceleration, is also called acceleration sensor or accelerometer, because its impulse response is excellent and is suitable for measuring shock. In this paper, the piezoelectric accelerometer is the research object, because of the advantages of small volume, light weight, wide frequency response, high temperature resistance, good stability and do not need to reference position, it is used widely in aircraft testing dynamic measurement field. The piezoelectric accelerometer is also a piezoelectric transducer, it can change the vibration or shock acceleration to the charge proportionally, According to this principle, in this article, this type of sensor equivalent circuit is proposed, design the Charge/voltage conversion circuit used in accelerometer in acquisition and measurement system, making use of anti aliasing high-order filter circuit based on the actual sensor bandwidth. Analyze the key components like the temperature characteristic of feedback capacitor and its insulation resistances' effect on the switching circuit output in the Charge/voltage conversion circuit. Provides an important testing data and advice for the accelerometer and its preset the principle circuit of the engineering practice. © International Frequency Sensor Association (IFSA). All rights reserved.

Zhuo H.,National Key Laboratory for Electronic Measurement and Technology | Xun L.,North University of China
Sensors and Transducers | Year: 2014

In order to estimate and get the flight attitude, trajectory, launching speed, ejection altitude, landing point, landing speed and displacement, etc. of aircraft, parameters of six degree of freedom inertial measurement unit are usually acquired to establish the settlement data base in the design and study of aircraft. Moreover, the gyro used to measure the angular rate is an important part of the six degree of freedom inertial measurement unit. Belonging to the category of dynamic measurement, the research in this paper, taking a single mass capacitive vibratory micro-machined gyro as the object and combining Coriolis principle with the measurement mechanism of capacitive micro-machined vibrating gyro, made an analysis on the measurement errors of angular rate of this kind of gyro caused by the axial acceleration. Meanwhile, a kind of anti-aliasing filtering module of signal preconditioning circuit of the gyro was designed in this paper by taking advantage of elliptic high-order low-pass filter, which was consonant with the frequency band range in the actual application of angular rate, and preferably restrained the errors caused by the axial acceleration of a single mass capacitive vibrating micro-machined gyro, and provided some important test data and recommendations for its engineering practice as well. © 2014 IFSA Publishing, S. L.

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