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Improved shearing insulating piezoelectric accelerometer capable of being used at 200 deg.C

A piezoelectric accelerometer and accelerometer technology, applied in the direction of acceleration measurement using inertial force, can solve the problems of detection instruments and test personnel, such as adverse consequences, to improve high-temperature piezoelectric performance and process performance, increase Curie temperature, The effect of guaranteeing accuracy

Inactive Publication Date: 2002-05-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The loop signal generated by the system under test may have adverse consequences on the test results, testing instruments and testers, and the shear piezoelectric accelerometer can only be used at room temperature

Method used

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  • Improved shearing insulating piezoelectric accelerometer capable of being used at 200 deg.C
  • Improved shearing insulating piezoelectric accelerometer capable of being used at 200 deg.C
  • Improved shearing insulating piezoelectric accelerometer capable of being used at 200 deg.C

Examples

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Embodiment 1

[0029] Example 1 The composition of piezoelectric ceramic sheet is Pb 0.95 Ca 0.05 Nd 2 O 6 To CeO 2 It is an additive, the added amount is 0.10wt, and the high-temperature piezoelectric ceramic element is made by general ceramic technology. Its Tc=540℃, Kt=0.40, Qmimage 3 Shown), the height is within 1mm, it is made of polyimide material that can be used for a long time at a high temperature of 200-250°C. The insulator and the accelerometer are connected by thread and epoxy resin. The threaded insert used to install the accelerometer is pressed into one body in advance with the insulator. The mounting screw hole in the insert has a size of 4mm, which is located in the center of the base and is insulated from the base. After these four improvements, the shear-type insulated piezoelectric accelerometer can be used at a high temperature of 200°C.

Embodiment 2

[0030] Example 2 The composition of the piezoelectric ceramic sheet is Pb 0.93 Ba 0.07 Nd 2 O 6 , The additive is Sm 2 O 3 , The addition amount y=0.15wt%, Tc=545℃, Kt=0.42, the inner cavity of the insulator is square, the height is 1.5mm, the shape of the thread insert is also square, made of polyimide material It is fixed in the insulator by screw thread and adhesive. The rest is the same as in Example 1.

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Abstract

The sheared bottom-insulated piezoelectric accelerometer, capable of using at high temperature of 200 deg.C is characterized by that its piezoelectric sensing element is a modified lead metanibate high-temp. piezoelectric ceramics made up by using Ca (2+) or Ba (2+) and adding rare-earth oxide. At the same time it adopts a high specific weight elconite mass block, and uses glass body as insulating material of signal output device instead of fluoroplastics, and can uses polyimide material which can be used at 200-250 deg.C for a long period and possesses high impedance and good abrasive resistance to make insulator, and the internal cavity of insulator can be any one kind of inner hexagon, tetragonal or star form. It adopts screw and epoxy resin adhesive double connection process to fix said insulator to the base seat to the accelerometer.

Description

Technical field [0001] The invention relates to an improved bottom insulated shear piezoelectric accelerometer used at a high temperature of 200 DEG C, and belongs to the field of vibration sensors. Background technique [0002] The magnitude of vibration can reflect the operating conditions of objects and equipment. The detection of vibrations involves almost all engineering fields. To detect vibration, a vibration measuring instrument is necessary, and a vibration sensor is indispensable. Among them, the piezoelectric accelerometers with no internal moving parts, small volume, and reliable performance are the most commonly used. The proper choice and performance of the piezoelectric accelerometer are of vital importance to the accuracy, reliability and safety of the detected signal. [0003] Piezoelectric accelerometers are devices with high output impedance, and the noise signals induced from the connecting cables can sometimes cause great trouble in detection. These interfere...

Claims

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Application Information

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IPC IPC(8): G01P15/09
Inventor 胡子俭
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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