阅读说明：本技术 一种光纤超声波气体湿度传感器 (Optical fiber ultrasonic gas humidity sensor ) 是由 不公告发明人 于 2020-12-28 设计创作，主要内容包括：本发明属于测量装置技术领域,具体涉及一种光纤超声波气体湿度传感器,包括激光器,激光器的一侧连接有光纤,光纤远离激光器的一端设置有连接保护层,连接保护层与光纤连接的截面设置有若干纳米金颗粒,连接保护层内部设置有水溶液,连接保护层远离光纤的一端设置有压电基板,压电基板上设置有敏感材料,敏感材料远离连接保护层一端的顶部设置有叉指换能器,叉指换能器上设置有信号输出端,压电基板靠近连接保护层一端的背侧设置有扩散器。本发明由于光纤可以长距离传输脉冲激光,进而可以远距离测量,而且可以随时控制激光输入,不仅功耗小,而且便于控制输入信号。(The invention belongs to the technical field of measuring devices, and particularly relates to an optical fiber ultrasonic gas humidity sensor which comprises a laser, wherein one side of the laser is connected with an optical fiber, one end, away from the laser, of the optical fiber is provided with a connecting protective layer, the section, connected with the optical fiber, of the connecting protective layer is provided with a plurality of nano-gold particles, an aqueous solution is arranged inside the connecting protective layer, one end, away from the optical fiber, of the connecting protective layer is provided with a piezoelectric substrate, a sensitive material is arranged on the piezoelectric substrate, the top, away from one end, of the connecting protective layer, of the sensitive material is provided with an interdigital transducer, a signal output end is arranged. The optical fiber can transmit the pulse laser in a long distance, so that the long-distance measurement can be realized, the laser input can be controlled at any time, the power consumption is low, and the input signal can be conveniently controlled.)

1. An optical fiber ultrasonic gas humidity sensor, comprising a laser (1), characterized in that: one side of laser instrument (1) is connected with optic fibre (2), the one end that laser instrument (1) was kept away from in optic fibre (2) is provided with connection protection layer (3), the cross-section that connection protection layer (3) and optic fibre (2) are connected is provided with a plurality of nanometer gold particles (4), inside water solution (5) that is provided with of connection protection layer (3), the one end that optic fibre (2) were kept away from in connection protection layer (3) is provided with piezoelectric substrate (7), be provided with sensitive material (6) on piezoelectric substrate (7), the top that connection protection layer (3) one end was kept away from in sensitive material (6) is provided with interdigital transducer (8), be provided with signal output part (9) on interdigital transducer (8), piezoelectric substrate (7) are close to the dorsal part of connection protection layer (3) one end and are provided with diffuser (10.

2. The optical fiber ultrasonic gas humidity sensor according to claim 1, wherein: the sensitive material (6) is made of an alloy material with strong corrosion resistance.

3. The optical fiber ultrasonic gas humidity sensor according to claim 2, wherein: the inner wall material of the connecting protective layer (3) is made of resin material with stronger corrosion resistance.

4. The fiber optic ultrasonic gas humidity sensor according to claim 3, wherein: the laser port of the laser (1), the optical fiber (2), the connection protective layer (3) and the piezoelectric substrate (7) are all located on the same horizontal height.

5. The fiber optic ultrasonic gas humidity sensor according to claim 4, wherein: the optical fiber (2) is in signal connection with the sensitive material (6) through the connection protective layer (3).

6. The fiber optic ultrasonic gas humidity sensor according to claim 5, wherein: one end of the sensitive material (6) close to the connecting protective layer (3) is positioned in the aqueous solution (5).

7. The fiber optic ultrasonic gas humidity sensor according to claim 6, wherein: the sensitive material (6) is attached and connected to the convex surface of the piezoelectric substrate (7).

8. The fiber optic ultrasonic gas humidity sensor according to claim 7, wherein: the diffuser (10) is fastened on the piezoelectric substrate (7) through screws, and the diffusion opening of the diffuser is matched with the sensitive material (6).

Technical Field

The invention relates to the technical field of gas humidity detection devices, in particular to an optical fiber ultrasonic gas humidity sensor.

Background

The gas humidity sensor is an important device for effectively detecting gas humidity, and the stability and reliability of the gas humidity sensor have important influence on the maintenance of related devices and the normal and smooth promotion of related work, so that the design of the high-precision and stable gas humidity sensor is of great significance.

In the prior art, due to the structural limitation of the gas humidity sensor, the sensitivity is low, and the measurement precision cannot be guaranteed.

Disclosure of Invention

The invention aims to provide an optical fiber ultrasonic gas humidity sensor, which solves the problem that the fluctuation direction and the fluctuation size of seawater are difficult to detect.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an optic fibre ultrasonic wave gas humidity transducer, includes the laser instrument, one side of laser instrument is connected with optic fibre, the one end that the laser instrument was kept away from to optic fibre is provided with the connection protection layer, the cross-section that connection protection layer and optic fibre are connected is provided with a plurality of nanometer gold particles, the inside aqueous solution that is provided with of connection protection layer, the one end that connection protection layer kept away from optic fibre is provided with the piezoelectric substrate, be provided with sensitive material on the piezoelectric substrate, the top that sensitive material kept away from connection protection layer one end is provided with the interdigital transducer, be provided with signal output part on the interdigital transducer, the dorsal part that piezoelectric substrate is close to connection.

Preferably, the sensitive material is made of an alloy material with stronger corrosion resistance.

Preferably, the inner wall material of the connection protection layer is made of a resin material with strong corrosion resistance.

Preferably, the laser port, the optical fiber, the connection protection layer and the piezoelectric substrate of the laser are all located at the same horizontal height.

Preferably, the optical fiber is in signal connection with the sensitive material through the connection protective layer.

Preferably, the sensitive material is located inside the aqueous solution near one end of the connection protection layer.

Preferably, the sensitive material is attached to the convex surface of the piezoelectric substrate.

Preferably, the diffuser is fastened to the piezoelectric substrate by screws, and the diffusion opening of the diffuser is matched with the sensitive material.

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

the laser emits pulse laser through the optical fiber, the pulse laser irradiates the nano gold particles on the section of the optical fiber, the nano gold particles absorb the energy of the pulse laser, are heated and expanded, are cooled and shrunk instantly by water, the nano gold particles expand and contract instantly, simultaneously generate ultrasonic signals and transmit the ultrasonic signals to sensitive materials to generate surface acoustic waves, the surface acoustic waves are transmitted to the interdigital transducer through the sensitive materials, and then the interdigital transducer converts the acoustic waves into electric signals to be output. Meanwhile, the optical fiber can transmit the pulse laser in a long distance, so the design can realize long-distance measurement, can control laser input at any time, has low power consumption and is convenient for controlling input signals.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a first schematic view of a piezoelectric substrate connection structure according to the present invention;

fig. 3 is a schematic view of a piezoelectric substrate connection structure according to a second embodiment of the present invention.

In the figure: 1. a laser; 2. an optical fiber; 3. connecting the protective layer; 4. gold nanoparticles; 5. an aqueous solution; 6. a sensitive material; 7. a piezoelectric substrate; 8. an interdigital transducer; 9. a signal output terminal; 10. a diffuser.

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

Referring to fig. 1, an optical fiber ultrasonic gas humidity sensor includes a laser 1, an optical fiber 2 is connected to one side of the laser 1, a connection protection layer 3 is disposed at one end of the optical fiber 2, which is far away from the laser 1, a plurality of nano gold particles 4 are disposed on a cross section of the connection protection layer 3, which is connected to the optical fiber 2, an aqueous solution 5 is disposed inside the connection protection layer 3, a piezoelectric substrate 7 is disposed at one end of the connection protection layer 3, a sensitive material 6 is disposed on the piezoelectric substrate 7, an interdigital transducer 8 is disposed at a top of the sensitive material 6, which is far away from one end of the connection protection layer 3, a signal output end 9 is disposed on the interdigital transducer 8, a diffuser 10 is disposed at a back side of one end of the piezoelectric substrate 7, which is close to one end of the connection protection layer 3, the optical fiber 2.

Specifically, when the concentration and humidity of water molecules in gas are measured, the water molecules exist in the air to be measured, the sensitive material 6 is a material capable of changing hardness after absorbing water and is used as a propagation medium of surface acoustic waves, when the hardness of the sensitive material 6 is changed, the transmission speed of sound waves is also changed, when the interdigital transducer 8 receives different sound wave signals, different electric signals are output, and the concentration of the water in the air is calculated by analyzing the output different electric signals.

Example 2

Referring to fig. 1, an optical fiber ultrasonic gas humidity sensor includes a laser 1, an optical fiber 2 is connected to one side of the laser 1, a connection protection layer 3 is disposed at one end of the optical fiber 2, which is far away from the laser 1, a plurality of nano gold particles 4 are disposed on a cross section of the connection protection layer 3, which is connected to the optical fiber 2, an aqueous solution 5 is disposed inside the connection protection layer 3, a piezoelectric substrate 7 is disposed at one end of the connection protection layer 3, a sensitive material 6 is disposed on the piezoelectric substrate 7, an interdigital transducer 8 is disposed at a top of the sensitive material 6, which is far away from one end of the connection protection layer 3, a signal output end 9 is disposed on the interdigital transducer 8, a diffuser 10 is disposed at a back side of one end of the piezoelectric substrate 7, which is close to one end of the connection protection layer 3, the optical fiber 2.

Specifically, when the concentration and humidity of water molecules in gas are measured, the water molecules exist in the air to be measured, the sensitive material 6 is a material capable of changing hardness after absorbing water and is used as a propagation medium of surface acoustic waves, when the hardness of the sensitive material 6 is changed, the transmission speed of sound waves is also changed, when the interdigital transducer 8 receives different sound wave signals, different electric signals are output, and the concentration of the water in the air is calculated by analyzing the output different electric signals.

Specifically, the laser port of the laser 1, the optical fiber 2, the connection protection layer 3, and the piezoelectric substrate 7 are all located at the same level. Because the devices are all arranged on the same horizontal height, the laser emitted by the laser 1 can be linearly transmitted along the optical fiber 2, and the detection sensitivity is further ensured.

Example 3

Referring to fig. 1, an optical fiber ultrasonic gas humidity sensor includes a laser 1, an optical fiber 2 is connected to one side of the laser 1, a connection protection layer 3 is disposed at one end of the optical fiber 2, which is far away from the laser 1, a plurality of nano gold particles 4 are disposed on a cross section of the connection protection layer 3, which is connected to the optical fiber 2, an aqueous solution 5 is disposed inside the connection protection layer 3, a piezoelectric substrate 7 is disposed at one end of the connection protection layer 3, a sensitive material 6 is disposed on the piezoelectric substrate 7, an interdigital transducer 8 is disposed at a top of the sensitive material 6, which is far away from one end of the connection protection layer 3, a signal output end 9 is disposed on the interdigital transducer 8, a diffuser 10 is disposed at a back side of one end of the piezoelectric substrate 7, which is close to one end of the connection protection layer 3, the optical fiber 2.

Specifically, when the concentration and humidity of water molecules in gas are measured, the water molecules exist in the air to be measured, the sensitive material 6 is a material capable of changing hardness after absorbing water and is used as a propagation medium of surface acoustic waves, when the hardness of the sensitive material 6 is changed, the transmission speed of sound waves is also changed, when the interdigital transducer 8 receives different sound wave signals, different electric signals are output, and the concentration of the water in the air is calculated by analyzing the output different electric signals.

The laser port of the laser 1, the optical fiber 2, the connection protection layer 3, and the piezoelectric substrate 7 are all located at the same level. Because the devices are all arranged on the same horizontal height, the laser emitted by the laser 1 can be linearly transmitted along the optical fiber 2, and the detection sensitivity is further ensured.

Specifically, the optical fiber 2 is in signal connection with the sensitive material 6 through the connection protective layer 3, and one end of the sensitive material 6 close to the connection protective layer 3 is positioned inside the aqueous solution 5. Through the mutual contact of the aqueous solution 5 and the sensitive material 6, the sensitive material 6 absorbs water more quickly, the detection capability is stronger, and the sensor works more efficiently.

Example 4

Referring to fig. 1, an optical fiber ultrasonic gas humidity sensor includes a laser 1, an optical fiber 2 is connected to one side of the laser 1, a connection protection layer 3 is disposed at one end of the optical fiber 2, which is far away from the laser 1, a plurality of nano gold particles 4 are disposed on a cross section of the connection protection layer 3, which is connected to the optical fiber 2, an aqueous solution 5 is disposed inside the connection protection layer 3, a piezoelectric substrate 7 is disposed at one end of the connection protection layer 3, a sensitive material 6 is disposed on the piezoelectric substrate 7, an interdigital transducer 8 is disposed at a top of the sensitive material 6, which is far away from one end of the connection protection layer 3, a signal output end 9 is disposed on the interdigital transducer 8, a diffuser 10 is disposed at a back side of one end of the piezoelectric substrate 7, which is close to one end of the connection protection layer 3, the optical fiber 2.

Specifically, when the concentration and humidity of water molecules in gas are measured, the water molecules exist in the air to be measured, the sensitive material 6 is a material capable of changing hardness after absorbing water and is used as a propagation medium of surface acoustic waves, when the hardness of the sensitive material 6 is changed, the transmission speed of sound waves is also changed, when the interdigital transducer 8 receives different sound wave signals, different electric signals are output, and the concentration of the water in the air is calculated by analyzing the output different electric signals.

The laser port of the laser 1, the optical fiber 2, the connection protection layer 3, and the piezoelectric substrate 7 are all located at the same level. Because the devices are all arranged on the same horizontal height, the laser emitted by the laser 1 can be linearly transmitted along the optical fiber 2, and the detection sensitivity is further ensured.

The optical fiber 2 is in signal connection with the sensitive material 6 through the connection protective layer 3, and one end of the sensitive material 6 close to the connection protective layer 3 is positioned inside the aqueous solution 5. Through the mutual contact of the aqueous solution 5 and the sensitive material 6, the sensitive material 6 absorbs water more quickly, the detection capability is stronger, and the sensor works more efficiently.

Specifically, referring to fig. 2 and 3, the sensitive material 6 is attached to the convex surface of the piezoelectric substrate 7, and the diffuser 10 is fastened to the piezoelectric substrate 7 by screws, and the diffusion opening of the diffuser matches with the sensitive material 6. Attach sensitive material on the protruding surface of piezoelectric substrate 7, the area of contact of sensitive material 6 with the air has been increased, thereby make hydrone and sensitive material 6 effect more abundant, the reaction is more violent, make surface acoustic wave propagation effect change more obvious, produce the not signal of telecommunication of equidimension more effectively, come to express different air water molecule content through calculating the signal of telecommunication, secondly, add diffuser 10 in sensitive material 6 department, accelerate the circulation of air, further accelerate the effect of hydrone to sensitive material 6, further accelerate surface acoustic wave signal change, thereby it is more obvious to make the signal of telecommunication change, more do benefit to and express different air water molecule content through the signal of telecommunication.

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.