CN112763752A

CN112763752A - Acceleration sensor based on photoacoustic effect

Info

Publication number: CN112763752A
Application number: CN202011498552.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-05-07

Abstract

The invention belongs to the technical field of sensors, and particularly relates to an acceleration sensor based on a photoacoustic effect, which comprises a container wall, a laser, an ultrasonic detector and photoacoustic reaction particles, wherein the laser is fixedly installed on the inner side of the lower end of the container wall, the ultrasonic detector is fixedly installed on the inner side of the lower end of the container wall, the laser is tightly attached to one side of the container wall, the ultrasonic detector is tightly attached to the other side of the container wall, and the photoacoustic reaction particles are arranged in the container wall. According to the invention, the relative speed of the photoacoustic reaction particles relative to the laser is changed through the change of the external acceleration, so that the ultrasonic frequency generated by the photoacoustic reaction particles under the action of the exciting light is changed, and the change of the external acceleration is closely related to the ultrasonic frequency, so that the measurement of the external acceleration can be realized. The device can measure the tiny acceleration change, and the reaction is very sensitive and the sensitivity is extremely high.

Description

Acceleration sensor based on photoacoustic effect

Technical Field

The invention relates to the technical field of sensors, in particular to an acceleration sensor based on a photoacoustic effect.

Background

An acceleration sensor is a sensor capable of measuring acceleration. The damper is generally composed of a mass block, a damper, an elastic element, a sensitive element, an adjusting circuit and the like. In the acceleration process, the sensor obtains an acceleration value by measuring the inertial force borne by the mass block and utilizing Newton's second law. Common acceleration sensors include capacitive, inductive, strain, piezoresistive, piezoelectric, etc. depending on the sensor sensing element.

In the prior art, the sensitivity of the acceleration sensor is low, and the small acceleration variation cannot be induced, so that the accuracy of the measurement result is influenced. Accordingly, there is a need for improvements in the art.

Disclosure of Invention

The invention aims to provide an acceleration sensor based on a photoacoustic effect, which solves the problem of low sensitivity of the acceleration sensor.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an acceleration sensor based on optoacoustic effect, includes container wall, laser instrument, ultrasonic detector and optoacoustic reaction granule, the inboard fixed mounting of lower extreme of container wall has the laser instrument, the inboard fixed mounting of lower extreme of container wall has the ultrasonic detector, the laser instrument hugs closely in one side of container wall, the ultrasonic detector hugs closely the opposite side at the container wall, be provided with optoacoustic reaction granule in the container wall.

Preferably, the photo-acoustic reactive particles are suspended from the inner top wall of the container wall.

Preferably, the container wall is a sealing structure.

Preferably, the photoacoustic reaction particles are provided with connecting lines.

Preferably, the connecting lines of the photoacoustic reaction particles are fixed to the wall of the container.

Preferably, the photoacoustic reaction particle is plural.

Preferably, the photoacoustic response particles add additional counter-weight.

Preferably, a plurality of said photo-acoustic reactive particles are distributed at different locations of the top wall within the wall of the container.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the relative speed of the photoacoustic reaction particles relative to the laser is changed through the change of the external acceleration, so that the ultrasonic frequency generated by the photoacoustic reaction particles under the action of the exciting light is changed, and the change of the external acceleration is closely related to the ultrasonic frequency, so that the measurement of the external acceleration can be realized. The device can measure the tiny acceleration change, and the reaction is very sensitive and the sensitivity is extremely high.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: 1. a container wall; 2. a laser; 3. an ultrasonic detector; 4. photoacoustic reactive particles.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Please refer to fig. 1, an acceleration sensor based on photoacoustic effect, including container wall 1, laser 2, ultrasonic detector 3 and photoacoustic reaction particle 4, the lower extreme inboard fixed mounting of container wall 1 has laser 2, the lower extreme inboard fixed mounting of container wall 1 has ultrasonic detector 3, laser 2 hugs closely one side of container wall 1, ultrasonic detector 3 hugs closely the opposite side of container wall 1, be provided with photoacoustic reaction particle 4 in the container wall 1, photoacoustic reaction particle 4 hangs at the interior roof of container wall 1, container wall 1 is seal structure, be provided with the connecting wire on photoacoustic reaction particle 4, the connecting wire of photoacoustic reaction particle 4 is fixed on container wall 1, photoacoustic reaction particle 4 has a plurality ofly.

Specifically, the laser emitted by the laser 2 irradiates on the photoacoustic reactive particles 4, and generates vibration due to the photoacoustic effect to generate ultrasonic waves, and the ultrasonic waves are detected by the ultrasonic detector 3. When the external acceleration changes, the container wall 1 carries the laser 2 and the ultrasonic detector 3 to change in acceleration, but the suspended photoacoustic reaction particles 4 move due to inertia, the ultrasonic frequency generated by the photoacoustic reaction particles changes due to Doppler effect, the acceleration direction can be known according to the increase or decrease of the frequency, the ultrasonic change is closely related to the acceleration, and therefore the acceleration can be measured by measuring the ultrasonic frequency.

Example 2

In particular, the photoacoustic-responsive particles 4 add an additional weight. The sensor is suitable for various working environments, and the working range of the sensor can be changed.

Example 3

In particular, a plurality of photo-acoustically reactive particles 4 are distributed at different locations of the top wall within the container wall 1. The photoacoustic response particles 4 at different positions respond to laser with different wavelengths, the laser 2 emits laser with multiple wavelengths, and acceleration can be measured more accurately through the inclination angles at multiple positions.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Acceleration sensor based on the photoacoustic effect, comprising a container wall (1), a laser (2), an ultrasonic probe (3) and photoacoustic reaction particles (4), characterized in that: the utility model discloses a photoacoustic imaging device, including container wall (1), the inboard fixed mounting of lower extreme of container wall (1) has laser instrument (2), the inboard fixed mounting of lower extreme of container wall (1) has ultrasonic detector (3), laser instrument (2) hug closely in one side of container wall (1), ultrasonic detector (3) hug closely in the opposite side of container wall (1), be provided with optoacoustic reaction granule (4) in container wall (1).

2. An acceleration sensor based on photoacoustic effect according to claim 1, characterized in that: the photoacoustic reaction particles (4) are suspended on the inner top wall of the container wall (1).

3. An acceleration sensor based on photoacoustic effect according to claim 2, characterized in that: the container wall (1) is a sealing structure.

4. An acceleration sensor based on the photoacoustic effect as defined in claim 3, wherein: and connecting lines are arranged on the photoacoustic reaction particles (4).

5. An acceleration sensor based on photoacoustic effect according to claim 4, characterized in that: the connecting line of the photoacoustic reaction particles (4) is fixed on the wall (1) of the container.

6. An acceleration sensor based on the photoacoustic effect as defined in claim 5, wherein: the photoacoustic reaction particles (4) are plural.

7. An acceleration sensor based on the photoacoustic effect of claim 6, wherein: the photoacoustic response particles (4) add extra weight.

8. An acceleration sensor based on the photoacoustic effect of claim 7, wherein: a plurality of said photo-acoustic reactive particles (4) are distributed at different locations of the inner top wall of the container wall (1).