Future of imaging technology

Ai, Mitsuo

doi:10.1016/0924-4247(96)01306-4

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…By detecting the creating charge on the electrodes in a piezoelectric device, the sensing result is available. When the electric output port is electrically open, that means there is no free charge flow outward from the piezoelectric element, so according to Gauss' law the electric displacement vector: D=O (3) All charge on the electrodes is bound charge, the quantity of charge on each electrode is: where s is the permittivity offree space, and x is the tensor of electric polarizability ofthe piezoelectric material.…”

Section: Piezoelectric Sensory Elementmentioning

confidence: 99%

“…However, there are two problems in the application of a charge amplifier: 1.output saturation because of gradual drift caused by offset voltage and current of op-amp, 2. being inclined to self-oscillation. The practicable charge amplifier needs a saturation cancellation circuit or the charge sampling amplifier is used for substitution' 2-1 3 Here we chose voltage follower as the pre-amplifiers of the array to simplify the pre-conditioning circuits for the array. Fig.5 shows a single piezoelectric element with a voltage follower and its equivalent circuit.…”

Section: Pre-amplifiers For Arraymentioning

confidence: 99%

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Non-integrated piezoelectric passive sensor array for distributed sensing in smart structural systems

Wen

Huang

1997

SPIE Proceedings

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This paper presents a technology to design and fabricate sensor array using separate sensors or individual sensory devices for distributed sensing in smart structural systems. It reports in detail on a non-integrated piezoelectric passive sensor array, which is constructed of separate piezoelectric devices along the spatial distribution of the measurand. As piezoelectric sensory devices can be used as self-generating sensors ,the piezoelectric sensory array will sense passively without power supply. The sensor array consists of an X-Y matrix of m X n piezoelectric elements accompanied by diodes. The space of sensory elements ranges from 0. 1 meter to several meters and the external connections of the sensor array are m+n. The array is addressed as a memory and the sampling signals of analog sensing outputs of the elements can be taken out as a serial wave form to a single output port of the array. It is also possible to read the analogy output of one element by sustaining addressing of it. A description of the arrangement and control of the array is presented ,in addition, the electric response to mechanical input of piezoelectric sensory element is also analyzed to determinate the design of feasible preconditioning circuits for the sensor array.

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Section: Piezoelectric Sensory Elementmentioning

confidence: 99%

Section: Pre-amplifiers For Arraymentioning

confidence: 99%