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Piezoelectric ceramics transducer admittance circular graphic instruments

A technology of piezoelectric ceramics and transducers, which is applied in the field of devices for measuring the admittance of piezoelectric ceramic transducers, and can solve the problems of complex detection devices, time-consuming and labor-intensive, and low precision

Inactive Publication Date: 2003-09-03
姚成刚
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Agilent4192A (formerly HP4192A), but its price is very expensive, about 20,000-30,000 US dollars, and there are not many domestically owned such instruments
And it is not connected to the PC, it needs to develop its own interface with the computer and a program specially used for the piezoelectric ceramic transducer, which is used to analyze, extract and print out the parameters of the transducer
Agilent4192A has a wide range of applications (admittance detection of piezoelectric ceramic transducers is only a part of its function), so its performance index is also very high, resulting in complex detection devices and high costs. It is also inconvenient to analyze and extract parameters
[0006] Another method is to use a general-purpose waveform generator to scan point by point, record the readings with an oscilloscope, draw the admittance circle, and then obtain the parameters of the piezoelectric ceramic transducer. This method is not only time-consuming and laborious, but also has low accuracy.

Method used

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  • Piezoelectric ceramics transducer admittance circular graphic instruments
  • Piezoelectric ceramics transducer admittance circular graphic instruments
  • Piezoelectric ceramics transducer admittance circular graphic instruments

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Embodiment Construction

[0050] For its performance comparison with HP4192A, please refer to Figure 8 and Figure 9 .

[0051] The implementation of the scheme is divided into four parts: circuit schematic diagram, circuit PCB (printed circuit board) diagram, single-chip microcomputer (lower computer) program, PC machine (upper computer) program.

[0052] 1. Circuit schematic diagram:

[0053] Please refer to the schematic diagram Figure 6 , IC1 is single chip microcomputer AT89C51, IC2 is AD7008AP20. AT89C51 controls AD7008 AP20 through three ports of P0.0, P0.1 and P0.2. AD7008AP20 is industrial grade, and the maximum external crystal oscillator is 20MHz. Since the crystal oscillator directly affects the accuracy of its output frequency, a crystal oscillator with relatively high precision should be used, preferably a constant temperature crystal oscillator.

[0054] The amplitude of the sinusoidal signal output by the AD7008 is determined by the three resistors R1, R2, and R3. The form...

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Abstract

A graphic instrument for measuring the admittance circle of a piezoelectric ceramic transducer in order to indicate its application is composed of the hardware consisting of signal generator, operating and acquisition circuit and data communication unit, and the PC software consisting of data communication, user interface and data processing.

Description

technical field [0001] The invention relates to a device for measuring the admittance of piezoelectric ceramic transducers, which relates to the field of acoustics in physics. [0002] Piezoelectric ceramic transducers are a class of crystalline substances used in the field of acoustics to generate and receive sound. Before using the piezoelectric ceramic transducer, you need to know its main parameters before you can implement the application. The parameters mainly include: resonance point frequency, static capacitance (C0), dynamic impedance (R1, C1, L1), electromechanical coupling coefficient, equivalent Bandwidth, mechanical quality factor Q, temperature stability, etc. If the admittance value of the piezoelectric ceramic transducer within a frequency range near the resonance point can be measured, the above required parameters can be analyzed and extracted. Since the admittance value in this frequency range forms an approximate circle on the admittance complex coordinat...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R29/22
Inventor 姚成刚
Owner 姚成刚
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