CN209486129U - A kind of high sensitivity piezoelectric acceleration sensor - Google Patents
A kind of high sensitivity piezoelectric acceleration sensor Download PDFInfo
- Publication number
- CN209486129U CN209486129U CN201920296829.9U CN201920296829U CN209486129U CN 209486129 U CN209486129 U CN 209486129U CN 201920296829 U CN201920296829 U CN 201920296829U CN 209486129 U CN209486129 U CN 209486129U
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- piezo
- electric crystal
- piezoelectric acceleration
- mass block
- acceleration sensor
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Abstract
The utility model discloses a kind of highly sensitive piezoelectric acceleration sensors, including pedestal and upper cover, the upper cover lid is above pedestal, sensitive portion is installed on the pedestal, the sensitivity portion includes piezo-electric crystal and the mass block for counterweight, the outside of piezo-electric crystal is arranged in the mass block, is provided with threaded hole at the base lower surface center.Piezoelectric acceleration sensor provided by the utility model increases the area of piezo-electric crystal, and mass block uses tungsten metal, so that the output charge amount of sensor greatly increases, to significantly improve the charge sensitivity of sensor.
Description
Technical field
The utility model relates to acceleration transducer technical field, in particular to a kind of highly sensitive piezoelectric acceleration sensing
Device.
Background technique
Vibration acceleration is tested on defence and military, metallurgical machinery, civil engineering, road and bridge, vehicle naval vessel, aerospace
Etc. military projects civil field it is omnipresent, vibration survey will be carried out by being related to the engineering project of above-mentioned class in the test of knowing the real situation at research and development initial stage
Examination, wherein important engineering also needs permanently to be monitored on-line.Large scale structure is such as: bridge, dam, civil engineering, their vibration
Momentum is all in 0.5g hereinafter, need with highly sensitive acceleration transducer sensitivity test, China's high sensitivity acceleration biography
Sensor relies primarily on import, and use cost is high.
Utility model content
To overcome highly sensitive acceleration transducer existing in the prior art to need to introduce from foreign countries, use cost is high
Problem, the utility model provide a kind of highly sensitive piezoelectric acceleration sensor.
Specific technical solution is as follows:
A kind of high sensitivity piezoelectric acceleration sensor, including pedestal and upper cover, the upper cover lid is above pedestal, institute
It states and sensitive portion is installed on pedestal, the sensitivity portion includes piezo-electric crystal and the mass block for counterweight, the mass block setting
Threaded hole is provided at the outside of piezo-electric crystal, the base lower surface center.
Preferably, the specific gravity of the mass block and piezo-electric crystal is 17.
Preferably, the mass block is tungsten metal.
Preferably, the size of the piezo-electric crystal is 10 × 10 × 1.5mm.
The utility model has the advantages that compared with prior art
Piezoelectric acceleration sensor provided by the utility model increases the area of piezo-electric crystal, and mass block uses
Tungsten metal to significantly improve the charge sensitivity of sensor, and is tied so that the output charge amount of sensor greatly increases
Structure is simple, the high sensitivity testing suitable for large scale structure.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of highly sensitive piezoelectric acceleration sensor of the utility model.
In figure, 1- pedestal, 2- piezo-electric crystal, 3- mass block, 4- upper cover, 5- threaded hole 5.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing.It should be noted that
The explanation of these embodiments is used to help to understand the utility model, but does not constitute the restriction to the utility model.This
Outside, technical characteristic involved in the various embodiments of the present invention described below is as long as they do not conflict with each other
It can be combined with each other.
The utility model discloses a kind of highly sensitive piezoelectric acceleration sensors, as shown in Figure 1, including pedestal 1 and upper
Lid 4, the lid of upper cover 4 are equipped with sensitive portion on the top of pedestal 1, pedestal 1, and sensitive portion includes piezo-electric crystal 2 and for counterweight
The outside of piezo-electric crystal 2 is arranged in mass block 3, mass block 3, it is preferred that the size of the piezo-electric crystal 2 in the utility model is 10
× 10 × 1.5mm, mass block 3 are tungsten metal, and the specific gravity of mass block 3 and piezo-electric crystal 2 is 17.
As shown in Figure 1, being provided with threaded hole 5 at 1 lower surface center of pedestal, i.e., there is a M5 along the pedestal of sensor axis 1
Screw thread 5, for sensor to be mounted on measured piece, acceleration transducer obtains vibration signal along axial-movement.
Working principle: highly sensitive piezoelectric acceleration sensor impression vibration, the mass block 3 being extruded on piezo-electric crystal 2
The inertia force that vibration generates can be applied on crystal wafer, crystal wafer deformation generates charge, the size of vibrating sensor sensitivity
One depends on the inertia force that high specific gravity mass block 3 applies, and inertia force is bigger, and crystal wafer deformation is also big, and output charge amount is also big.It is brilliant
Body piece area increases, and the quantity of electric charge for deforming generation also will increase.The utility model increases the area of piezo-electric crystal 2, from 6 × 6 ×
0.8mm increases to 10 × 10 × 1.5mm, and the quantity of electric charge that area increase can be such that friction generates increases.It aggravates to match with piezo-electric crystal 2
High specific gravity metal volume, high specific gravity material use tungsten metal, its specific gravity 17, the utilization of high specific gravity material so that pass
Sensor volume greatly reduces.High specific gravity material is tightly pressed against piezo-electric crystal 2, can thus make the output charge amount of sensor
It greatly increases, so that the charge sensitivity of sensor is significantly improved, by improved highly sensitive acceleration transducer electricity
Lotus sensitivity is significantly improved to 1000pC/ms-2, frequency response 200Hz, when testing micro- vibration structure, signal-to-noise ratio mentions significantly in this way
Height is tested more accurate.
The embodiments of the present invention is explained in detail in conjunction with attached drawing above, but the utility model is not limited to be retouched
The embodiment stated.For a person skilled in the art, right in the case where not departing from the utility model principle and spirit
These embodiments carry out a variety of change, modification, replacement and modification, still fall in the protection scope of the utility model.
Claims (4)
1. a kind of high sensitivity piezoelectric acceleration sensor, it is characterised in that: including pedestal and upper cover, the upper cover lid is mounted in bottom
Above seat, sensitive portion is installed on the pedestal, the sensitivity portion includes piezo-electric crystal and the mass block for counterweight, the matter
The outside of piezo-electric crystal is arranged in gauge block, is provided with threaded hole at the base lower surface center.
2. a kind of highly sensitive piezoelectric acceleration sensor according to claim 1, it is characterised in that: the mass block with
The specific gravity of piezo-electric crystal is 17.
3. a kind of highly sensitive piezoelectric acceleration sensor according to claim 2, it is characterised in that: the mass block is
Tungsten metal.
4. a kind of highly sensitive piezoelectric acceleration sensor according to claim 1, it is characterised in that: the piezo-electric crystal
Size be 10 × 10 × 1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920296829.9U CN209486129U (en) | 2019-03-09 | 2019-03-09 | A kind of high sensitivity piezoelectric acceleration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920296829.9U CN209486129U (en) | 2019-03-09 | 2019-03-09 | A kind of high sensitivity piezoelectric acceleration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209486129U true CN209486129U (en) | 2019-10-11 |
Family
ID=68134302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920296829.9U Active CN209486129U (en) | 2019-03-09 | 2019-03-09 | A kind of high sensitivity piezoelectric acceleration sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209486129U (en) |
-
2019
- 2019-03-09 CN CN201920296829.9U patent/CN209486129U/en active Active
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