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Temperature control excitation system and method suitable for in-situ actual measurement of piezoelectric ceramic d33 under different conditions

A technology of piezoelectric ceramics and electric ceramics, which is applied in the field of temperature-controlled vibration excitation system and its measurement, can solve the problems such as the inability to observe the charge response curve of piezoelectric ceramics in real time, and achieve the effect of wide measurement range and accurate measurement data

Pending Publication Date: 2021-08-31
四川亚美电陶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has certain shortcomings: firstly, this method is limited by the design of the instrument and can only test d at a fixed frequency (generally 110Hz) and a fixed load (generally 0.25N). 33 ;Secondly, the chuck of the general-purpose quasi-static piezoelectric coefficient tester to hold the sample not only bears the function of applying stress load, but also bears the function of transmitting electric charge signal
Finally, the measurement principle of the quasi-static piezoelectric coefficient tester is to collect the average output charge of piezoelectric ceramics within a certain measurement time by connecting a large capacitor in parallel (displayed on the instrument panel as d 33 measured value), but it is impossible to observe the charge response curve output by piezoelectric ceramics with the time course in real time

Method used

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  • Temperature control excitation system and method suitable for in-situ actual measurement of piezoelectric ceramic d33 under different conditions
  • Temperature control excitation system and method suitable for in-situ actual measurement of piezoelectric ceramic d33 under different conditions
  • Temperature control excitation system and method suitable for in-situ actual measurement of piezoelectric ceramic d33 under different conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This example applies to piezoceramic d 33 The measured temperature-controlled vibration system such as figure 2 As shown, it includes a piezoelectric acceleration sensing component 1 , a temperature control box 2 , an excitation unit 3 , a signal acquisition unit 4 and a data processor 5 . The piezoelectric acceleration sensing component 1 is made of the piezoelectric ceramic sheet to be tested and a standard piezoelectric acceleration sensor, and is set in the temperature control box 2; the vibration excitation unit 3 is used to apply periodic vibration to the piezoelectric acceleration sensing component Load; the signal acquisition unit 4 is used to collect the signal transmitted by the piezoelectric acceleration sensor assembly, and sends it to the data processor 5; the data processor 5 is connected to the signal acquisition unit 4, and is used for performing data analysis according to the collected signal to obtain the Measuring the longitudinal piezoelectric stra...

Embodiment 2

[0068] In this embodiment, the temperature-controlled vibration system provided in Embodiment 1 is used to measure the piezoelectric ceramic d 33 The steps are as follows:

[0069] (1) Set the test temperature of the temperature control box to 20°C.

[0070] (2) After the temperature reaches the preset value, the start signal generator outputs a periodic signal to the exciter, so that the exciter applies a periodic vibration load to the standard piezoelectric acceleration sensor until the vibration acceleration amplitude a of its feedback reaches Expected value.

[0071] In this embodiment, after the temperature reaches the preset value, the start signal generator outputs a sinusoidal function signal with a frequency of 40 Hz to the vibrator, and gradually increases the voltage to make the vibrator vibrate until the vibration of the standard piezoelectric sensor is detected. Stop increasing the voltage when the acceleration value is 5g±5%.

[0072] When the charge response ...

Embodiment 3

[0079] In this embodiment, the temperature-controlled vibration system provided in Embodiment 1 is used to measure the piezoelectric ceramic d 33 The steps are as follows:

[0080] (1) Set the test temperature of the temperature control box to 20°C.

[0081] (2) After the temperature reaches the preset value, the start signal generator outputs a periodic signal to the exciter, so that the exciter applies a periodic vibration load to the standard piezoelectric acceleration sensor until the vibration acceleration amplitude a of its feedback reaches Expected value.

[0082] In this embodiment, after the temperature reaches the preset value, the start signal generator outputs a sinusoidal function signal with a frequency of 80 Hz to the exciter, and gradually increases the voltage to make the exciter vibrate until the vibration of the standard piezoelectric sensor is detected. Stop voltage regulation when the acceleration value is 5g±5%.

[0083] When the charge response curve ...

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Abstract

The invention discloses a temperature control excitation system and method suitable for in-situ actual measurement of piezoelectric ceramic d33 under different conditions. The temperature control excitation system comprises a piezoelectric acceleration sensing assembly, a temperature control box, an excitation unit, a signal acquisition unit and a data processor. A to-be-tested piezoelectric ceramic and a counterweight mass block are assembled together to form a to-be-tested piezoelectric acceleration sensor (prototype device), the to-be-tested piezoelectric acceleration sensor and a standard piezoelectric acceleration sensor are placed in a high-temperature box together to sense vibration given by a vibration exciter, and the d33 of the to-be-tested piezoelectric ceramic is inversely calculated according to the charge sensitivity of the sensor; and the d33 of the sample under different frequencies, different loads and different temperatures can be obtained by changing the vibration frequency, the vibration acceleration amplitude and the environment temperature value. According to the method, the defect that only d33 of the piezoelectric ceramic under three fixed conditions of room temperature / 110 Hz / 0.25 N can be measured by a common electrical measurement method is effectively overcome, the charge response curve output by the piezoelectric ceramic along with the time progress can be observed in real time, and the dynamic piezoelectric response characteristic of a material can be researched and analyzed favourably.

Description

technical field [0001] The invention belongs to the technical field of electrical performance testing, and relates to electrical performance testing for piezoelectric ceramic materials, in particular to in-situ actual measurement of piezoelectric ceramic d under different temperatures, frequencies and loads. 33 The temperature-controlled vibration excitation system and its measurement method. Background technique [0002] Piezoelectric ceramics can realize mutual conversion between electrical energy and mechanical energy, and can be made into various electronic devices such as sensors, drivers, transformers, transducers, etc., and are widely used in aerospace, communication electronics, automobile industry and other equipment manufacturing fields. It is a modern industrial system. an important electronic functional material. In recent years, with the development of wireless sensor networks, the problem of sensor energy self-supply in high-temperature environments has increa...

Claims

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Application Information

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IPC IPC(8): G01R29/22G01R31/00
CPCG01R29/22G01R31/003
Inventor 不公告发明人
Owner 四川亚美电陶科技有限公司