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The Development of Measurement Circuit for the Piezoelectric Accelerometer

Author: YinHongCai
Tutor: GeLiFeng
School: Anhui University
Course: Detection Technology and Automation
Keywords: Piezoelectric accelerometer Measuring circuit Charge amplifier Program-controlled
CLC: TP212.1
Type: Master's thesis
Year: 2007
Downloads: 940
Quote: 8
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Abstract


The piezoelectric acceleration sensor is a core member of the vibration and shock measurements, has a very important role in modern industrial and automated production processes, especially in the aspect of accuracy and long term stability is unique. The piezoelectric acceleration sensor can be seen as a high internal resistance of the charge-generating power generating element, which generates a very small amount of electric charge, while the smaller ships the input impedance of the measuring circuit, the charge on the piezoelectric sheet by the measurement circuit is input resistor leak rapidly introduce measurement errors. The piezoelectric accelerometer have a complete set of measurement circuit used in conjunction with, or its use would be subject to considerable limitations. The charge amplifier is the most commonly used piezoelectric acceleration sensor measuring circuit, it can get the input of a voltage output proportional to the charge, one of its characteristics is the sensitivity of the sensor is independent of the cable length. This paper presents an integrated chip to replace a large number of separate components of the charge amplifier design methods, the design of the charge amplifier by charge conversion stage, normalized amplifier stage, high and low pass filter stage, the output stage, the regulator power and overload indication level six components. And in the charge conversion portion sensitive capacitor switching and output of the amplifier stage gain of a program-controlled method for solutions proposed in the switching circuit, and a detailed theoretical analysis, so as to solve the manually adjusted easily to the system error and interference problem. We made a detailed theoretical analysis, the presence of interfering signals in the circuit system and the introduction of the error and take the way to solve. Finally, the contrast and the standard performance of the charge amplifier, to verify the feasibility of the design. Of the completion of the main tasks include: (1) through in-depth research of the various implementations of the piezoelectric acceleration sensor measuring circuit program, an integrated chip to replace the implementation of a large number of separate components of the charge amplifier; (2) production The complete circuit board; (3) in the charge sensitivity of the converting section capacitor switching and output of the amplifier stage gain switching circuit implementation on a programmable program; (4) is verified by experiments, experimental results are given; ( 5) on the basis of the experimental results, combined with the principle of the charge amplifier is made to the system error analysis.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Physical sensors
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