Measuring device with continuously changing piezoelectric constant with temperature and measuring method

Abstract

The invention relates to a measuring device with continuously changing piezoelectric constant with temperature and a measuring method. The measuring device comprises a voltage source, a piezoelectric parameter measuring instrument and a wind direction guide tube. The wind outlet end of the wind direction guide tube is connected with the piezoelectric parameter measuring instrument. A heating element is arranged in the wind direction guide tube. The heating element is connected with the voltage source. When measuring is carried out, a temperature coefficient is calibrated, and then the piezoelectric constant continuously changing with temperature is measured. According to the invention, an electric heating mode is used; local heating is carried out on a piezoelectric sample; the piezoelectric constant changing with temperature is monitored in real time; the piezoelectric constant within a temperature range more than room temperature can be measured; the temperature stability of a piezoelectric device can be accurately measured; the temperature use range of the piezoelectric device can be accurately determined; on the premise that the piezoelectric performance is not lower than a performance index, the accurate use temperature range can be provided; and the measuring device is suitable for a variety of piezoelectric ceramics including leaded piezoelectric ceramics and lead-free piezoelectric ceramics.

Description

technical field [0001] The invention relates to a method for measuring the piezoelectric constant, in particular to a method for measuring the piezoelectric constant of the piezoelectric material which changes continuously with the temperature around room temperature. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can convert mechanical energy and electrical energy into each other. It is a kind of functional ceramic material and also belongs to inorganic non-metallic materials. Piezoelectric ceramics are made by using their materials under the action of mechanical stress to cause the relative displacement of the internal positive and negative charge centers to cause polarization, resulting in the appearance of bound charges with opposite signs on the surface of the material, that is, the piezoelectric effect. It has sensitive characteristics. Piezoelectric ceramics are mainly used in the manufacture of ultrasonic transducers, under...

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Problems solved by technology

[0007] The object of the present invention is to provide a measuring device and method for measuring the piezoelectric constant continuously changing with the temperature in order to solve the above-mentioned problems in the piezoelectric constant measurement process that the performance of the piezoelectric ceramics can not be actually grasped when it deviates from room temperature, which can be measured in real time. The piezoelectric performance of the piezoelectric device is obtained when it deviates from the room temperature, and its accurate service temperature range can be given when the piezoelectric performance is not lower than a certain performance index. It is suitable for various piezoelectric ceramics, including lead-containing piezoelectric ceramics. and lead-free piezoelectric ceramic

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