CN114326092A - Piezoelectric ceramic resonant chopper - Google Patents
Piezoelectric ceramic resonant chopper Download PDFInfo
- Publication number
- CN114326092A CN114326092A CN202111488821.0A CN202111488821A CN114326092A CN 114326092 A CN114326092 A CN 114326092A CN 202111488821 A CN202111488821 A CN 202111488821A CN 114326092 A CN114326092 A CN 114326092A
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- China
- Prior art keywords
- piezoelectric ceramic
- shell
- fixed
- circuit board
- metal substrate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000919 ceramic Substances 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000005622 photoelectricity Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 8
- 230000000087 stabilizing effect Effects 0.000 description 8
- 230000010355 oscillation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses a piezoelectric ceramic resonant chopper, and belongs to the technical field of photoelectricity. The light chopper is small in size, low in energy consumption and stable in light chopping precision. It includes a circuit board fixed in a housing; two electrode pins (8) and a reference electrical signal output port (10) are fixed on the shell (1), and the piezoelectric vibrator is fixed in the shell (1) through a base (7) with a mounting groove (9) at the top; the pendulum is composed of a connecting rod (3) which is connected with the metal substrate into a whole and a shading plate (11) which is connected with the connecting rod into a whole; the two piezoelectric ceramic plates (5) are arranged on the front surface and the back surface of the metal substrate (6), the output positive electrode of the circuit board (2) is electrically connected with the piezoelectric ceramic plates (5), and the output negative electrode is electrically connected with the metal substrate (6); the shell cover (4) is provided with a light through hole (12). The invention has simple structure, long service life and good frequency stability; is a light chopper driven by piezoelectric ceramics.
Description
Technical Field
The invention relates to a photointerrupter, in particular to a piezoelectric ceramic resonant chopper; belongs to the field of photoelectric technology.
Background
When an optical signal is measured, the optical signal to be measured may be weak, and may be interfered by many signals, even the intensity of the interference signal is far higher than that of the optical signal to be measured. For this case, a lock-in amplifier is usually used to measure these signals buried in noise, and a photointerrupter may provide a reference signal to the lock-in amplifier. The photointerrupter modulates the optical radiation signal into an alternating signal by modulating the optical signal, and outputs a reference voltage square wave synchronous with the modulation frequency, so that an accurate reference signal is provided for the phase-locked amplifier, and the phase-locked amplifier can identify a useful weak signal.
At present, the common photointerrupters are mechanical photointerrupters which are generally driven by a large synchronous motor to rotate a porous light cutting plate, and have the defects of complex structure, large volume, weak electromagnetic interference resistance, high price and the like. Although the tuning fork type chopper is relatively cheap, an external oscillating circuit is required, and magnetism is generated by a driving coil so as to drive the tuning fork to realize the chopping function.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the piezoelectric ceramic resonant chopper which is small in size, simple in structure, low in energy consumption, stable in chopping precision and long in service life.
In order to achieve the purpose, the invention adopts the following technical scheme: it includes a closed shell formed from shell body and shell cover, circuit board fixed in said shell; two electrode pins electrically connected with the circuit board and a reference electrical signal output port are fixed on the shell, and a piezoelectric vibrator composed of a vibration pendulum and a piezoelectric ceramic piece is fixed in the shell through a base with a mounting groove on the top; the vibration pendulum is composed of a metal substrate inserted in the mounting groove, a connecting rod fixedly connected with the top of the metal substrate into a whole, and a shading plate fixedly connected with the top of the connecting rod into a whole; the two piezoelectric ceramic plates are respectively attached to the front side and the back side of the metal substrate, the output positive electrode of the circuit board is electrically connected with one of the piezoelectric ceramic plates, and the output negative electrode of the circuit board is electrically connected with the metal substrate; the shell is provided with a light through hole corresponding to the position of the light screen.
Epoxy resin is filled in the mounting groove; a heat sink is fixed in the housing, and the circuit board is fixed on the heat sink.
Compared with the prior art, the method has the following advantages due to the adoption of the technical scheme:
1) an external oscillating circuit is not needed, and the normal work can be realized only by external direct-current voltage; therefore, the structure is simple.
2) An oscillating coil does not need to be installed in the device, so the device has compact structure, small volume and low energy consumption.
3) The pendulum is made of alloy steel, and the inherent resonant frequency temperature coefficient of the pendulum reaches 10-6and/C, therefore, the frequency stability is good.
4) Because of adopting the mechatronic structure, the frequency of the output electric signal can be ensured to be completely consistent with the chopping frequency, so the inherent resonant frequency of the piezoelectric vibrator is the light modulation frequency, the energy consumption is low, the efficiency is high, the service life is long, and the chopping precision is stable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a schematic diagram of the circuit board structure of the present invention.
In the figure: the device comprises a shell 1, a circuit board 2, an oscillating circuit 2-1, a first voltage stabilizing circuit 2-2, a reference electric signal output circuit 2-3, a working electric signal output circuit 2-4, a second voltage stabilizing circuit 2-5, an adjustable booster circuit 2-6, a connecting rod 3, a shell cover 4, a piezoelectric ceramic piece 5, a metal substrate 6, a base 7, an electrode pin 8, a mounting groove 9, a reference electric signal output port 10, a light screen 11, a light through hole 12 and a radiator 13.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1 to 3, a circuit board 2 is fixed in a closed housing formed by a housing 1 and a housing cover 4, and the circuit board is provided with an oscillating circuit 2-1, a first voltage stabilizing circuit 2-2, a reference electrical signal output circuit 2-3, a working electrical signal output circuit 2-4, a second voltage stabilizing circuit 2-5 and an adjustable booster circuit 2-6; the oscillation circuit 2-1, the first voltage stabilizing circuit 2-2 and the reference electric signal output circuit 2-3 are electrically connected in sequence, and the oscillation circuit 2-1, the adjustable booster circuit 2-6, the second voltage stabilizing circuit 2-5 and the working electric signal output circuit 2-4 are electrically connected in sequence.
Two electrode pins 8 electrically connected with the circuit board 2 are fixed at the bottom of the shell 1, a reference electrical signal output port 10 electrically connected with the reference electrical signal output circuit 2-3 is fixed at the side of the shell 1, and a piezoelectric vibrator composed of a pendulum and a piezoelectric ceramic piece 5 is fixed in the shell 1 through a base 7. The top of the base 7 is provided with an installation groove 9, and the pendulum consists of a metal substrate 6 inserted in the installation groove, a connecting rod 3 fixedly connected with the top of the metal substrate into a whole, and a light screen 11 fixedly connected with the top of the connecting rod into a whole. Two piezoelectric ceramic plates 5 are respectively attached to the front surface and the back surface of the metal substrate 6, the output positive electrode of the working electric signal output circuit 2-4 is electrically connected with one piezoelectric ceramic plate 5, and the output negative electrode of the working electric signal output circuit 2-4 is electrically connected with the metal substrate 6 to form a power-on loop; the shell 1 and the shell cover 4 are both provided with light through holes 12 corresponding to the positions of the light shielding plates 11.
In order to prevent the runout, epoxy resin for fixing the metal substrate 6 is filled in the mounting groove 9.
The temperature of the circuit board 2 is reduced and a heat sink 13 is fixed in the housing 1, to which the circuit board 2 is fixed by screws.
The working principle is as follows: after the power supply is switched on, the oscillation circuit 2-1 oscillates the externally input direct current voltage into a square wave signal with constant frequency and certain voltage. One part of the square wave signal is subjected to voltage stabilization by a first voltage stabilizing circuit 2-2 and then output through a reference electric signal output port 10 electrically connected with a reference electric signal output circuit 2-3, the other part of the square wave signal is sequentially subjected to processing by an adjustable booster circuit 2-6 and a second voltage stabilizing circuit 2-5 to form a square wave signal with constant frequency, and the square wave signal is output to the piezoelectric vibrator through the positive electrode and the negative electrode of a working electric signal output circuit 2-4, so that the vibration of the piezoelectric ceramic piece 5 is driven to swing. The swinging light shielding plate 11 can shield the optical signal which is passed through by the porcelain powder from the light through hole 12, thereby realizing the modulation of the optical signal into the optical signal output with the required specific frequency.
The invention can be suitable for measuring the intensity, speed or pulse characteristics of laser, visible light and ultraviolet light, and is mainly applied to the related fields of photoelectric metering, photoelectric sensing, remote sensing systems, measuring systems, satellite tracking and the like.
Claims (3)
1. A piezoelectric ceramic resonant chopper comprises a closed shell consisting of a shell body and a shell cover, and a circuit board fixed in the shell; the method is characterized in that: two electrode pins (8) electrically connected with the circuit board (2) and a reference electrical signal output port (10) are fixed on the shell (1), and a piezoelectric vibrator formed by a vibration pendulum and a piezoelectric ceramic piece (5) is fixed in the shell (1) through a base (7) with a mounting groove (9) at the top; the vibration pendulum is composed of a metal substrate (6) inserted in the mounting groove (9), a connecting rod (3) fixedly connected with the top of the metal substrate into a whole, and a shading plate (11) fixedly connected with the top of the connecting rod into a whole; the two piezoelectric ceramic plates (5) are respectively attached to the front surface and the back surface of the metal substrate (6), the output positive electrode of the circuit board (2) is electrically connected with one of the piezoelectric ceramic plates (5), and the output negative electrode of the circuit board (2) is electrically connected with the metal substrate (6); the shell is provided with a light through hole (12) corresponding to the position of the light screen (11).
2. The piezoelectric ceramic resonant chopper as recited in claim 1, wherein: epoxy resin is filled in the mounting groove (9).
3. The piezoelectric ceramic resonant chopper as recited in claim 1, wherein: a heat sink (13) is fixed in the housing (1), and the circuit board (2) is fixed on the heat sink.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111488821.0A CN114326092A (en) | 2021-12-08 | 2021-12-08 | Piezoelectric ceramic resonant chopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111488821.0A CN114326092A (en) | 2021-12-08 | 2021-12-08 | Piezoelectric ceramic resonant chopper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114326092A true CN114326092A (en) | 2022-04-12 |
Family
ID=81048052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111488821.0A Pending CN114326092A (en) | 2021-12-08 | 2021-12-08 | Piezoelectric ceramic resonant chopper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114326092A (en) |
-
2021
- 2021-12-08 CN CN202111488821.0A patent/CN114326092A/en active Pending
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