CN219328471U

CN219328471U - Ultrasonic sensor supporting structure with frequency selection characteristic

Info

Publication number: CN219328471U
Application number: CN202223529327.7U
Authority: CN
Inventors: 赵程; 黄建; 张�浩
Original assignee: Lianyungang Haiwei Photoelectric Technology Co ltd
Current assignee: Lianyungang Haiwei Photoelectric Technology Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-07-11
Anticipated expiration: 2032-12-27

Abstract

The utility model provides an ultrasonic sensor support structure with frequency selective characteristics, which comprises an inner layer and an outer layer, wherein an acoustic damping layer is arranged between the inner layer and the outer layer. The acoustic damping layer can play a role in damping vibration, can selectively attenuate the frequency of the vibration, does not leak the frequency, prevents the vibration from returning to the ultrasonic probe, and improves the signal-to-noise ratio.

Description

Ultrasonic sensor supporting structure with frequency selection characteristic

Technical Field

The utility model relates to the field of ultrasonic waves, in particular to an ultrasonic sensor supporting structure with frequency selection characteristics.

Background

The ultrasonic sensor is capable of converting an input voltage into vibrations at ultrasonic frequencies. The vibrations at the ultrasonic frequency radiate through an acoustic window, forming ultrasonic waves that propagate in air or other media. By measuring the propagation time and propagation energy of the ultrasonic wave, information such as the flow rate of the medium and the distance of the object can be calculated. Therefore, the ultrasonic sensor is widely used in the fields of instruments and meters, intelligent equipment, high-end medical equipment and the like.

In general, vibrations generated by the ultrasonic sensor radiate not only from the acoustic window, but also propagate from the solid structure holding the ultrasonic sensor and are reflected back and forth on the fixed structure to form stray waves, which increases noise in the ultrasonic signal, thereby reducing the signal-to-noise ratio of the ultrasonic sensor.

At present, most probes adopt rubber or silica gel materials as connecting pieces of an ultrasonic sensor and a fixed structure, and stray waves are reduced to a certain extent by means of damping of materials such as rubber. However, although the rubber material can attenuate most of the vibration transmitted through the rubber material in a very wide frequency range, in practical application, the damping material such as rubber can leak frequency, that is, the vibration in certain frequency ranges can attenuate less through the rubber, and in certain cases, the vibration can return to the ultrasonic probe, thereby reducing the signal-to-noise ratio.

Disclosure of Invention

The utility model aims to provide an ultrasonic sensor supporting structure with frequency selection characteristics, which improves the signal to noise ratio.

In order to achieve the above object, the present utility model provides the following technical solutions:

an ultrasonic sensor support structure with frequency selective properties includes an inner layer and an outer layer with an acoustic damping layer disposed therebetween.

Further, in the above-described ultrasonic sensor support structure having the frequency selective characteristic, the acoustic damping layer is composed of a plurality of layers of acoustic damping materials.

Further, in the above-mentioned ultrasonic sensor support structure with frequency selective characteristics, the damping frequency ranges of the acoustic damping materials of the respective layers are sequentially distributed from low frequency to high frequency from the inner layer to the outer layer.

Further, in the above-mentioned ultrasonic sensor support structure with frequency selective characteristic, two adjacent layers of the acoustic damping materials are bonded together by a glue layer.

Further, in the above ultrasonic sensor support structure with frequency selective characteristic, the thickness of the glue layer is less than 0.3mm.

Further, in the above ultrasonic sensor support structure with frequency selective characteristic, the thickness of each layer of the acoustic damping material is 0.1mm-0.5mm.

Further, in the above ultrasonic sensor support structure with frequency selective characteristic, the material of the inner layer is one or more of polyurethane foam, polyester material and foam, the thickness of the inner layer is 0.5mm,

the material of the outer layer is one or more of rubber, silica gel and cork, and the thickness of the outer layer is 0.3mm.

Further, in the above-described ultrasonic sensor support structure having the frequency selective characteristic, the entire thickness of the acoustic damping layer is 1mm to 3mm.

Further, in the above-described ultrasonic sensor support structure having frequency selective characteristics, there are 4 to 6 layers of acoustic damping materials in total.

Further, in the above-mentioned ultrasonic sensor support structure with frequency selective characteristic, the plurality of layers of acoustic damping materials are cork, polyurethane foam, polyester material, foam, silica gel, and rubber material, respectively.

Analysis shows that the utility model discloses an ultrasonic sensor support structure with frequency selection characteristics, and the signal to noise ratio is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. Wherein:

FIG. 1 is a schematic diagram of an embodiment of the present utility model.

Reference numerals illustrate: 1. an ultrasonic sensor; 2. an inner layer; 3. an acoustic damping layer; 4. an outer layer; .

Detailed Description

The utility model will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the utility model and not limitation of the utility model. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present utility model without departing from the scope or spirit of the utility model. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present utility model encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.

In the description of the present utility model, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present utility model and do not require that the present utility model must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The terms "coupled," "connected," and "configured" as used herein are to be construed broadly and may be, for example, fixedly connected or detachably connected; can be directly connected or indirectly connected through an intermediate component; either a wired electrical connection, a radio connection or a wireless communication signal connection, the specific meaning of which terms will be understood by those of ordinary skill in the art as the case may be.

One or more examples of the utility model are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the utility model. As used herein, the terms "first," "second," and "third," etc. are used interchangeably to distinguish one component from another and are not intended to represent the location or importance of the individual components.

As shown in fig. 1, according to an embodiment of the present utility model, there is provided an ultrasonic sensor 1 supporting structure having a frequency selective characteristic, including an inner layer 2 and an outer layer 4, between which inner layer 2 and outer layer 4 an acoustic damping layer 3 is provided.

The acoustic damping layer 3 can attenuate vibration, selectively attenuate the frequency of vibration, prevent frequency leakage, prevent the vibration from returning to the ultrasonic probe, and improve signal-to-noise ratio.

Preferably, the acoustic damping layer 3 is composed of a plurality of layers of acoustic damping material. The acoustic damping material can block low-frequency noise generated by the outside and attenuate and absorb high-frequency noise inside, so that the signal-to-noise ratio of the ultrasonic sensor 1 is improved.

From the inner layer 2 to the outer layer 4, the damping frequency ranges of the acoustic damping materials of the layers are distributed in sequence from low frequency to high frequency. Because the outside mechanical vibration can bring low-frequency noise to the sensor, and the ultrasonic wave generated by the high-frequency vibration of the vibrating body inside the sensor can bring certain noise to the sensor through reflection and absorption, the acoustic damping materials are distributed from the low frequency to the high frequency in sequence from inside to outside, and the noise generated by the outside and the inside can be reduced and avoided.

Two adjacent layers of the acoustic damping materials are bonded together through a glue layer. The thickness of the glue layer is less than 0.3mm (wavelength of the operating frequency of the ultrasonic sensor 1). The different acoustic damping materials are bonded together through epoxy resin, and the thickness of the bonding layer of the epoxy resin is as thin as possible, so that the influence of the bonding layer on the damping material is reduced.

The thickness of each layer of the acoustic damping material is 0.1mm-0.5mm (a quarter of the wavelength of the operating frequency of the ultrasonic sensor 1).

The supporting structure of the ultrasonic sensor 1 is composed of a plurality of layers of acoustic damping materials nested between the rubber rings of the outermost layer 4 and the innermost layer 2, the damping frequency ranges of the acoustic damping materials are distributed from the inner ring to the outer ring in sequence from low frequency to high frequency, and each layer of materials are bonded together by means of glue layers with the thickness being far smaller than the wavelength of the working frequency of the ultrasonic sensor 1. The thickness of each layer of damping material is a quarter of the wavelength of the operating frequency of the ultrasonic sensor 1.

Further, the material of the inner layer 2 is one or more of polyurethane foam, polyester material and foam, the thickness of the inner layer 2 is 0.5mm, the material of the outer layer 4 is one or more of rubber, silica gel and cork, and the thickness of the outer layer 4 is 0.3mm.

The overall thickness of the acoustic damping layer 3 is 1mm-3mm.

There are 4-6 layers of acoustic damping material. The multi-layer acoustic damping materials are respectively cork, polyurethane foam, polyester material, foam, silica gel and rubber material.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An ultrasonic sensor support structure with frequency selective characteristics, characterized in that,

comprises an inner layer and an outer layer,

an acoustic damping layer is disposed between the inner layer and the outer layer,

the acoustic damping layer is composed of multiple layers of acoustic damping material,

from the inner layer to the outer layer,

the damping frequency ranges of the acoustic damping materials of the layers are distributed in sequence from low frequency to high frequency.

2. The ultrasonic sensor support structure with frequency selective properties according to claim 1,

two adjacent layers of the acoustic damping materials are bonded together through a glue layer.

3. The ultrasonic sensor support structure with frequency selective properties according to claim 2,

the thickness of the glue layer is smaller than 0.3mm.

4. The ultrasonic sensor support structure with frequency selective properties according to claim 1,

the thickness of each layer of the acoustic damping material is 0.1mm-0.5mm.

5. The ultrasonic sensor support structure with frequency selective properties according to claim 1,

the thickness of the inner layer is 0.5mm,

the thickness of the outer layer was 0.3mm.

6. The ultrasonic sensor support structure with frequency selective properties according to claim 1,

the overall thickness of the acoustic damping layer is 1mm-3mm.

7. The ultrasonic sensor support structure with frequency selective properties according to claim 1,

there are 4-6 layers of acoustic damping material.

8. The ultrasonic sensor support structure with frequency selective properties according to claim 1,

the multi-layer acoustic damping materials are respectively cork, polyurethane foam, polyester material, foam, silica gel and rubber material.