CN211374595U - Self-sensing piezoelectric patch circuit - Google Patents
Self-sensing piezoelectric patch circuit Download PDFInfo
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- CN211374595U CN211374595U CN202020001887.7U CN202020001887U CN211374595U CN 211374595 U CN211374595 U CN 211374595U CN 202020001887 U CN202020001887 U CN 202020001887U CN 211374595 U CN211374595 U CN 211374595U
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Abstract
The utility model discloses a from sensing piezoelectric patches circuit, including series connection piezoelectric patches and electric capacity together, wherein the piezoelectric patches is connected with signal generator electricity to a signal acquisition appearance that still connects in parallel at the both ends of piezoelectric patches. The utility model discloses a from sensing piezoelectric patch circuit can distinguish excitation signal and echo signal, can receive by oneself to use quantity with the piezoelectric patch reduces half. Because the paired piezoelectric sheets are not needed, the arrangement mode of the piezoelectric array can be more flexible and diversified.
Description
Technical Field
The utility model belongs to the nondestructive test field, in particular to from sensing piezoelectric patch circuit in this field.
Background
The nondestructive testing using the time reversal method generally uses a pair of piezoelectric plates, one for excitation and one for reception, and the higher the positioning accuracy, the larger the number of piezoelectric plates required.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a self-sensing piezoelectric patch circuit is provided.
The utility model adopts the following technical scheme:
in a self-sensing piezoelectric patch circuit, the improvement comprising: the piezoelectric sensor comprises a piezoelectric patch and a capacitor which are connected in series, wherein the piezoelectric patch is electrically connected with a signal generator, and two ends of the piezoelectric patch are also connected with a signal acquisition instrument in parallel.
Furthermore, the piezoelectric patch is piezoelectric ceramic, and the material attached to the piezoelectric patch is an alumina ceramic sheet; the capacitor is a patch capacitor.
Furthermore, the piezoelectric patches and the capacitor are arranged in the packaging shell, the surface of the packaging shell is provided with the annular magnet and the two connector lugs, and the piezoelectric patches in the packaging shell can be respectively and electrically connected with the signal generator and the signal acquisition instrument through one connector lug.
Further, the piezoelectric plate and the capacitor are fixedly mounted in the packaging shell through AB glue.
A piezoelectric patch excitation and echo signal calculation method is suitable for the self-sensing piezoelectric patch circuit, and the improvement is that:
the piezoelectric sheet can be equivalent to a power supply Vp(t) and a capacitor Cp，Vp(t) is a voltage signal generated by the piezoelectric sheet based on the piezoelectric effect, CpCan be measured by an impedance meter, and a signal generator generates a signal Vi(t) exciting the piezoelectric patch, and receiving the voltage V by the signal acquisition instrument connected in parallel at two ends of the piezoelectric patcho(t)，Vo(t) is derived from the input voltage Vi(t0 and the piezoelectric effect generating voltage Vp(t) a capacitance value C in series1Then V iso(t) is represented by the following formula:
for a single excitation signal, the signal acquisition instrument firstly acquires an excitation signal V divided by a series capacitor1(t) and then the divided echo signal V2(t) the calculation formulas are respectively as follows:
the utility model has the advantages that:
the utility model discloses a from sensing piezoelectric patch circuit can distinguish excitation signal and echo signal, can receive by oneself to use quantity with the piezoelectric patch reduces half. Because the paired piezoelectric sheets are not needed, the arrangement mode of the piezoelectric array can be more flexible and diversified.
Drawings
Fig. 1 is an equivalent model diagram of the self-sensing piezoelectric patch circuit disclosed in the present invention;
fig. 2 is a schematic connection diagram of the self-sensing piezoelectric patch circuit disclosed in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The piezoelectric sheet self-sensing means that the piezoelectric sheet can receive signals while exciting the signals. The self-sensing circuit is essentially a voltage dividing circuit, as shown in fig. 1, a series circuit is composed of a piezoelectric plate 1 and a common capacitor 2, wherein an electrical equivalent model of the piezoelectric plate is shown in a dashed line frame.
Embodiment 1, as shown in fig. 2, this embodiment discloses a self-sensing piezoelectric patch circuit, which includes a piezoelectric patch 1 and a capacitor 2 connected in series, wherein the piezoelectric patch is electrically connected to a signal generator 3, and a signal collector 4 is connected in parallel to two ends of the piezoelectric patch.
The piezoelectric sheet is piezoelectric ceramic, and the material attached to the piezoelectric sheet is an alumina ceramic sheet; the capacitor is a patch capacitor. The piezoelectric patch and the capacitor are arranged in the packaging shell, the surface of the packaging shell is provided with the annular magnet and the two connector lugs, and the piezoelectric patch in the packaging shell can be electrically connected with the signal generator and the signal acquisition instrument through one connector lug respectively. The piezoelectric plate and the capacitor are fixedly installed in the packaging shell through AB glue.
The embodiment also discloses a piezoelectric patch excitation and echo signal calculation method, which is suitable for the self-sensing piezoelectric patch circuit:
the piezoelectric sheet can be equivalent to a power supply Vp(t) and a capacitor Cp，Vp(t) is a voltage signal generated by the piezoelectric sheet based on the piezoelectric effect, CpCan be measured by an impedance meter. In actual work, the packaging shell provided with the piezoelectric sheet can be bonded on a test piece through a coupling agent, and can also be adsorbed on the test piece through a ring-shaped magnet. The signal generator generates a signal Vi(t) exciting the piezoelectric patch, and receiving the voltage V by the signal acquisition instrument connected in parallel at two ends of the piezoelectric patcho(t)，Vo(t) is derived from the input voltage Vi(t) generating a voltage V with the piezoelectric effectp(t) a capacitance value C in series1Then V iso(t) is represented by the following formula:
in normal experimental use, a single-excitation signal is generally used, so that the signal acquisition instrument firstly acquires an excitation signal V divided by a series capacitor1(t) and then the divided echo signal V2(t) the calculation formulas are respectively as follows:
Claims (4)
1. a self-sensing piezoelectric patch circuit, comprising: the piezoelectric sensor comprises a piezoelectric patch and a capacitor which are connected in series, wherein the piezoelectric patch is electrically connected with a signal generator, and two ends of the piezoelectric patch are also connected with a signal acquisition instrument in parallel.
2. A self-sensing piezoelectric patch circuit according to claim 1, wherein: the piezoelectric sheet is piezoelectric ceramic, and the material attached to the piezoelectric sheet is an alumina ceramic sheet; the capacitor is a patch capacitor.
3. A self-sensing piezoelectric patch circuit according to claim 1, wherein: the piezoelectric patch and the capacitor are arranged in the packaging shell, the surface of the packaging shell is provided with the annular magnet and the two connector lugs, and the piezoelectric patch in the packaging shell can be electrically connected with the signal generator and the signal acquisition instrument through one connector lug respectively.
4. A self-sensing piezoelectric patch circuit according to claim 1, wherein: the piezoelectric plate and the capacitor are fixedly installed in the packaging shell through AB glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020001887.7U CN211374595U (en) | 2020-01-01 | 2020-01-01 | Self-sensing piezoelectric patch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020001887.7U CN211374595U (en) | 2020-01-01 | 2020-01-01 | Self-sensing piezoelectric patch circuit |
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| CN211374595U true CN211374595U (en) | 2020-08-28 |
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| CN202020001887.7U Active CN211374595U (en) | 2020-01-01 | 2020-01-01 | Self-sensing piezoelectric patch circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044579A (en) * | 2020-01-01 | 2020-04-21 | 中国海洋大学 | Self-sensing piezoelectric patch circuit and piezoelectric patch excitation and echo signal calculation method |
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2020
- 2020-01-01 CN CN202020001887.7U patent/CN211374595U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044579A (en) * | 2020-01-01 | 2020-04-21 | 中国海洋大学 | Self-sensing piezoelectric patch circuit and piezoelectric patch excitation and echo signal calculation method |
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