CN112197851A - Fiber optic acoustic detection probe - Google Patents
Fiber optic acoustic detection probe Download PDFInfo
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- CN112197851A CN112197851A CN202011096925.2A CN202011096925A CN112197851A CN 112197851 A CN112197851 A CN 112197851A CN 202011096925 A CN202011096925 A CN 202011096925A CN 112197851 A CN112197851 A CN 112197851A
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- bragg grating
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- 238000001514 detection method Methods 0.000 title claims abstract description 102
- 239000000835 fiber Substances 0.000 title claims abstract description 82
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- 239000012528 membrane Substances 0.000 claims description 26
- 230000003287 optical effect Effects 0.000 claims description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
本发明公开了一种光纤声波检测探头。包括：主体外壳、弹性薄膜、检测光纤。所述主体外壳设置有开口；所述弹性薄膜固定在所述开口上，并遮挡所述开口；所述检测光纤的一端固定在所述弹性薄膜上，另一端穿过所述主体外壳，所述检测光纤设置有光纤微结构反射区，用于在所述检测光纤发生轴向形变时，产生变化的反射光信号。通过在主体外壳的开口上设置弹性薄膜，使声波产生的振动通过弹性薄膜传导至检测光纤上，通过增大检测探头与声波相互作用的面积，提高检测的灵敏度。
The invention discloses an optical fiber acoustic wave detection probe. Including: main body shell, elastic film, detection fiber. The main body shell is provided with an opening; the elastic film is fixed on the opening and blocks the opening; one end of the detection optical fiber is fixed on the elastic film, and the other end passes through the main body shell, the The detection fiber is provided with an optical fiber microstructure reflection area, which is used to generate a changed reflected light signal when the detection fiber is axially deformed. By arranging an elastic film on the opening of the main shell, the vibration generated by the sound wave is transmitted to the detection fiber through the elastic film, and the detection sensitivity is improved by increasing the interaction area between the detection probe and the sound wave.
Description
Technical Field
The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber sound wave detection probe.
Background
Common piezoelectric or electromagnetic acoustic wave sensors are widely applied, but are difficult to be applied to detection work in extreme environments and are easily subjected to electromagnetic interference. The optical fiber sound wave detection probe has the advantages of compact structure, electromagnetic interference resistance, strong environmental adaptability and the like, and is beneficial to overcoming the defects of the existing electrical sound wave sensor. At present, the optical fiber acoustic wave detection probe is widely applied to the fields of health monitoring, seismic wave detection, hydrophones, nondestructive inspection and the like of large-scale structures. The optical fiber sound wave detection probe in the related art only depends on the optical fiber itself as an acoustic sensing probe to carry out sound wave measurement, and the probe has small interaction area with sound waves and lower sensitivity.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an optical fiber sound wave detection probe which can increase the interaction area of sound waves and the probe during detection and improve the detection sensitivity.
According to the embodiment of the invention, the optical fiber sound wave detection probe comprises: a main body housing provided with an opening; the elastic film is fixed on the opening and shields the opening; and one end of the detection optical fiber is fixed on the elastic film, the other end of the detection optical fiber penetrates through the main body shell, and the detection optical fiber is provided with an optical fiber microstructure reflection area and is used for generating a changed reflected optical signal when the detection optical fiber is axially deformed.
The optical fiber sound wave detection probe provided by the embodiment of the invention at least has the following beneficial effects: through set up the elastic membrane on the opening at main body cover, make the vibration that the sound wave produced transmit to detecting optical fiber through the elastic membrane on, increased the area of test probe and sound wave interact, improve the sensitivity that detects.
According to some embodiments of the invention, the fiber optic micro-structured reflective region comprises: the fiber Bragg grating structure comprises a first fiber Bragg grating and a second fiber Bragg grating, wherein a Fabry-Perot resonant cavity is formed between the first fiber Bragg grating and the second fiber Bragg grating.
According to some embodiments of the invention, the first and second fiber bragg gratings are uniform fiber bragg gratings.
According to some embodiments of the invention, the first fiber bragg grating and the second fiber bragg grating are the same length.
According to some embodiments of the invention, the main body housing is provided with a pressure balancing hole, and the pressure balancing hole is communicated with the inner cavity of the main body housing and is used for balancing the pressure between the main body housing and the external environment.
According to some embodiments of the present invention, the detection optical fiber is connected to the elastic membrane through a fixing sleeve, a through hole is formed in the elastic membrane, the detection optical fiber is fixed to the fixing sleeve, and the fixing sleeve is fixed in the through hole.
According to some embodiments of the invention, the elastic membrane is secured to the opening by a membrane retaining ring.
According to some embodiments of the invention, the other end of the detection optical fiber passes through the main body housing, and the detection optical fiber is fixedly connected with the main body housing.
According to some embodiments of the invention, the body shell is made of a hard material having a rockwell hardness greater than 90 HRB.
According to some embodiments of the invention, the elastic membrane is a latex membrane.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a schematic diagram of an optical fiber acoustic wave detection probe according to an embodiment of the present invention;
fig. 2 is a schematic diagram of detecting an acoustic signal according to an embodiment of the present invention.
Reference numerals:
a main body shell 110, an elastic film 120, a detection optical fiber 130, a film fixing ring 140, a fixing sleeve 150 and ultraviolet glue 160;
the opening 111, the pressure balance hole 112, the fiber microstructure reflection area 131, and the first fiber bragg grating 1311;
a second fiber bragg grating 1312.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1, in some embodiments of the present invention, a fiber optic acoustic detection probe comprises: a main body case 110, an elastic membrane 120, and a detection optical fiber 130. The main body housing 110 is provided with an opening 111, the elastic film 120 is fixed on the opening 111 and covers the opening 111, one end of the detection optical fiber 130 is fixed on the elastic film 120, the other end of the detection optical fiber passes through the main body housing 110, and the detection optical fiber 130 is provided with an optical fiber microstructure reflection area 131 for generating a changed reflected optical signal when the detection optical fiber is deformed axially.
In some embodiments, the main body housing 110 is configured as a funnel shape, wherein the bottom surface of the larger area side of the funnel is provided with an opening 111 for fixing the elastic membrane 120, and the other bottom surface is provided with an opening for passing through the detection fiber 130, so that the detection fiber 130 can transmit light signals with the outside. The elastic membrane 120 is in a taut state over the opening 111 for better receiving the acoustic signal and converting the acoustic signal into a vibration of the elastic membrane 120. In other embodiments, the body housing 110 may be T-shaped, conical, or other irregular shape.
One end of the detection optical fiber 130 is fixed to the elastic film 120, so that the vibration of the elastic film 120 can be transmitted to the detection optical fiber 130, the other end of the detection optical fiber 130 passes through the opening of the main body housing 110, and is connected to an external light source generating device and a photoelectric detection device, so as to provide an optical signal and detect a reflected optical signal, that is, the detection optical fiber has both functions of inputting an optical signal and outputting a modulated optical signal, and the detection optical fiber is connected to the photoelectric detection device through an optical fiber circulator, so that the photoelectric detection device can detect the reflected optical signal. The opening is fixedly connected with the detection optical fiber 130, so that the detection optical fiber 130 cannot move in the main body shell 110, the axial length change of the detection optical fiber 130 can be caused only by the vibration of the elastic film 120, the influence of other vibrations on the detection optical fiber 130 is reduced, and the accuracy of sound wave detection is improved.
The detection fiber 130 is provided with a fiber microstructure reflection area 131 for generating a changed reflected light signal when the detection fiber 130 is deformed axially. The fiber microstructure reflection region 131 may be a fiber bragg grating, which is a diffraction grating formed by periodically modulating the refractive index of the fiber core of the fiber in the axial direction by a certain method, and has an effect that when a beam of broad spectrum light passes through the fiber bragg grating, light with a wavelength satisfying the fiber bragg condition of the fiber bragg grating is reflected, and light with other wavelengths is transmitted through the fiber bragg grating. In some other embodiments, the optical grating may be a phase shift grating, or may be a fabry-perot resonator with a micro-bubble structure. In these structures, when the axial length of the detection optical fiber 130 changes, the reflected light signal in the reflection spectrum changes, and the change of the acoustic wave signal is detected by detecting the change of the reflected light signal
By arranging the elastic film 120 on the optical fiber sound wave detection probe, the contact area between the optical fiber sound wave detection probe and an external sound wave signal is increased, and the sensitivity of the optical fiber sound wave detection probe for detecting the sound wave signal is increased.
In some embodiments of the present invention, the fiber microstructure reflection region 131 includes a first fiber bragg grating 1311 and a second fiber bragg grating 1312, and a fabry-perot resonator is formed between the first fiber bragg grating 1311 and the second fiber bragg grating 1312. By arranging the first fiber bragg grating 1311 and the second fiber bragg grating 1312, after a light beam passes through the gratings, first reflected light is generated at the first fiber bragg grating 1311, second reflected light is generated at the second fiber bragg grating 1312, and the first reflected light and the second reflected light resonate in the transmission process, so that a fabry-perot resonant cavity is formed. Compared with a single fiber Bragg grating, the optical fiber Bragg grating has higher sensitivity.
Referring to fig. 2, it is a schematic diagram of the fiber acoustic wave detection probe of the present invention for detecting acoustic signals:
when the sound wave signal exists outside, the sound wave signal can cause the elastic film 120 to vibrate, and because the elastic film 120 and the detection optical fiber 130 are fixed, the detection optical fiber 130 can shrink in the axial direction, so that the cavity length of the Fabry-Perot resonant cavity is changed, the resonance spectrum of the reflected light drifts, and the voltage of the photoelectric detection device is changed by the drift of the resonance spectrum of the reflected light, so that the intensity of the outside sound wave signal is reflected, and the sound wave detection function is completed.
In some embodiments of the present invention, the first fiber bragg grating 1311 and the second fiber bragg grating 1312 are uniform fiber bragg gratings, i.e., the periodic variations in the fiber bragg gratings have the same refractive index. In other embodiments, the fiber grating may be non-uniform, and may also reflect a spectrum of a specific frequency.
In some embodiments of the present invention, the first fiber bragg grating 1311 and the second fiber bragg grating 1312 are the same length. At this time, when the detection optical fiber 130 is manufactured, only two identical fiber bragg gratings are required to be spaced by a certain distance and are welded into a whole through an optical fiber fusion splicer, so that a fabry-perot resonant cavity can be formed between the first fiber bragg grating 1311 and the second fiber bragg grating 1312, and mass manufacturing is facilitated. For example, the first fiber bragg grating 1311 and the second fiber bragg grating 1312 may be spaced apart by 1 cm, and in other embodiments, the spacing distance may be flexibly adjusted according to different incident light frequencies. In other embodiments, the optical fiber bragg gratings may have different lengths, and the same detection effect can be achieved only by forming resonant light with the central wavelengths reflected by the two optical fiber bragg gratings.
In some embodiments of the present invention, a pressure balance hole 112 is formed on the main body housing 110, and the pressure balance hole 112 is used for balancing the pressure between the main body housing 110 and the external environment. The pressure balance hole 112 is used for balancing the internal pressure and the external pressure of the optical fiber sound wave detection probe, preventing the elastic film 120 from deforming due to the internal and external pressure difference, reducing the detection error of the photoelectric detection device, and being applicable to areas with different air pressures and sound wave detection scenes in different liquids.
In some embodiments of the present invention, the detection fiber 130 is connected to the elastic membrane 120 through a fixing sleeve 150, a through hole is formed in the elastic membrane 120, the detection fiber 130 is fixed to the fixing sleeve 150, and the fixing sleeve 150 is fixed in the through hole. The fixing sleeve 150 is fixed in the through hole of the elastic membrane 120 by a washer, and the detection optical fiber 130 and the fixing sleeve 150 are fixed by injecting ultraviolet glue 160 into the fixing sleeve 150, so that the detection optical fiber 130 and the elastic membrane 120 are tightly fixed.
In some embodiments of the present invention, the elastic membrane 120 is secured to the opening 111 by a membrane retainer 140. The size of the film fixing ring 140 is slightly larger than that of the opening 111, and the film fixing ring can be integrally clamped on the opening 111. When the elastic film 120 is installed, the opening 111 is covered with the elastic film 120, and the film fixing ring 140 is clamped on the opening 111, so that the elastic film 120 is fixed on the opening 111. The elastic film 120 is fixed by clamping the film fixing ring 140, so that the elastic film is convenient to mount and dismount and is convenient to replace when the elastic film 120 is damaged.
In some embodiments of the present invention, the other end of the detection fiber 130 passes through the main body housing 110, and the detection fiber 130 is fixedly connected to the main body housing 110. For example, an opening is formed in the main body housing 110 for allowing the detection optical fiber 130 to pass through, and after the installation is completed, the detection optical fiber 130 is fixed on the opening by the ultraviolet adhesive 160, so that the detection optical fiber 130 is prevented from moving, and the detection accuracy is improved. The ultraviolet glue 160 is used for fixation, so that the detection optical fiber 130 cannot be abraded in the daily use process, and the service life of the optical fiber sound wave detection probe is prolonged. In other embodiments, the fixing may be performed by other methods such as hot melt adhesive, or may be performed by snap-fastening by providing a fixing member inside the main body housing 110.
In some embodiments of the invention, body housing 110 is made of a hard material having a Rockwell hardness greater than 90 HRB. The hard material with the Rockwell hardness of more than 90HRB can meet the hardness requirement on the shell of the probe under most conditions, and can be applied to various severe environmental conditions. For example, stainless steel materials may be used in acidic liquids or in humid environments. In other embodiments, plastic, ceramic, quartz, etc. materials may also be used.
In some embodiments of the present invention, the elastic membrane 120 is a latex membrane. When the latex film receives weak acoustic signals, the latex film still can generate larger deformation, so that the detection sensitivity of the optical fiber acoustic detection probe is improved. In other embodiments, the elastic film 120 may be a quartz sheet, a polymer sheet, a metal sheet, or the like, which is suitable for different detection environments.
In the description of the present invention, the first and second are only used for distinguishing technical features, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features or implicitly indicate the precedence of the indicated technical features.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "some embodiments," "examples," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The optical fiber sound wave detection probe is characterized by comprising:
a main body housing provided with an opening;
the elastic film is fixed on the opening and shields the opening;
and one end of the detection optical fiber is fixed on the elastic film, the other end of the detection optical fiber penetrates through the main body shell, and the detection optical fiber is provided with an optical fiber microstructure reflection area and is used for generating a changed reflected optical signal when the detection optical fiber is axially deformed.
2. The fiber optic acoustic wave detection probe of claim 1, wherein the fiber optic micro-structured reflective region comprises: the fiber Bragg grating structure comprises a first fiber Bragg grating and a second fiber Bragg grating, wherein a Fabry-Perot resonant cavity is formed between the first fiber Bragg grating and the second fiber Bragg grating.
3. The fiber acoustic wave detection probe of claim 2, wherein the first and second fiber bragg gratings are uniform fiber bragg gratings.
4. The fiber acoustic wave detection probe of claim 3, wherein the first fiber Bragg grating and the second fiber Bragg grating are the same length.
5. The fiber optic acoustic detection probe of claim 1, wherein the body housing is provided with a pressure balance hole, the pressure balance hole communicating with the inner cavity of the body housing for balancing a pressure between the body housing and an external environment.
6. The fiber acoustic wave detection probe according to claim 1, wherein the detection fiber is connected to the elastic membrane through a fixing sleeve, the elastic membrane is provided with a through hole, the detection fiber is fixed to the fixing sleeve, and the fixing sleeve is fixed to the through hole.
7. The fiber optic acoustic detection probe of claim 1, wherein the elastic membrane is secured over the opening by a membrane retainer ring.
8. The fiber optic acoustic wave detection probe of claim 1, wherein the other end of the detection fiber passes through the body housing, the detection fiber being fixedly connected to the body housing.
9. The fiber optic acoustic detection probe of claim 1, wherein the body housing is made of a hard material having a rockwell hardness greater than 90 HRB.
10. The fiber optic acoustic detection probe of any one of claims 1 to 9, wherein the elastic membrane is a latex membrane.
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| CN202011096925.2A CN112197851A (en) | 2020-10-14 | 2020-10-14 | Fiber optic acoustic detection probe |
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| CN202011096925.2A CN112197851A (en) | 2020-10-14 | 2020-10-14 | Fiber optic acoustic detection probe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432631A (en) * | 2021-07-16 | 2021-09-24 | 深圳技术大学 | Optical fiber sensor based on polymer film and polymer microcavity and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311485A (en) * | 1992-10-30 | 1994-05-10 | The United States Of America As Represented By The United States Department Of Energy | Fiber optic hydrophone |
| CN101936792A (en) * | 2010-09-27 | 2011-01-05 | 山东大学 | Mining Fiber Bragg Grating Negative Pressure Sensor |
| CN109781242A (en) * | 2019-03-08 | 2019-05-21 | 京东方科技集团股份有限公司 | Hydrophone, hydrophone array and hydrophone system |
| CN111323059A (en) * | 2018-12-17 | 2020-06-23 | 中国科学院深圳先进技术研究院 | Sensing device based on fiber Bragg grating Fabry-Perot cavity |
| CN213515986U (en) * | 2020-10-14 | 2021-06-22 | 深圳技术大学 | Optical fiber sound wave detection probe |
-
2020
- 2020-10-14 CN CN202011096925.2A patent/CN112197851A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311485A (en) * | 1992-10-30 | 1994-05-10 | The United States Of America As Represented By The United States Department Of Energy | Fiber optic hydrophone |
| CN101936792A (en) * | 2010-09-27 | 2011-01-05 | 山东大学 | Mining Fiber Bragg Grating Negative Pressure Sensor |
| CN111323059A (en) * | 2018-12-17 | 2020-06-23 | 中国科学院深圳先进技术研究院 | Sensing device based on fiber Bragg grating Fabry-Perot cavity |
| CN109781242A (en) * | 2019-03-08 | 2019-05-21 | 京东方科技集团股份有限公司 | Hydrophone, hydrophone array and hydrophone system |
| CN213515986U (en) * | 2020-10-14 | 2021-06-22 | 深圳技术大学 | Optical fiber sound wave detection probe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432631A (en) * | 2021-07-16 | 2021-09-24 | 深圳技术大学 | Optical fiber sensor based on polymer film and polymer microcavity and manufacturing method thereof |
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