CN219319332U

CN219319332U - Optical fiber sensor

Info

Publication number: CN219319332U
Application number: CN202223337342.1U
Authority: CN
Inventors: 魏平; 张秋月; 李秋锋
Original assignee: Nanjing Ruilanshi Photoelectric Sensor Technology Research Institute Co ltd
Current assignee: Nanjing Ruilanshi Photoelectric Sensor Technology Research Institute Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-07-07
Anticipated expiration: 2032-12-14

Abstract

The utility model discloses an optical fiber sensor, which comprises a shell, wherein an optical fiber is arranged on the shell, and a light source is arranged on the shell; an extension shell is welded on the shell, a lens ring is arranged in the extension shell, a convex lens is fixedly arranged in the lens ring, and light rays of the light source pass through the convex lens and are concentrated on the optical fiber; the lens ring can slide in the extension shell, the lens ring and the extension shell are positioned by bolts, and the bolts are taken down when the lens ring is used; an extension column is fixedly arranged on the outer side of the lens ring, and penetrates through the side wall of the extension shell to extend to the outside. According to the utility model, the shell and the extension column are arranged, the extension column is directly arranged in the measured object, and after the measured object is deformed, the extension column can be directly carried to deform, so that the lens ring and the convex lens are carried to move, the focusing point can deviate from the optical fiber and directly irradiates the optical signal receiver, and the optical signal receiver detects a light beam signal, so that the object deformation is excessively large, and the optical signal receiver can be used for warning of the deformation limit of the object.

Description

Optical fiber sensor

Technical Field

The utility model relates to the field of optical fiber sensors, in particular to an optical fiber sensor.

Background

The working principle of the optical fiber sensor is that the light beam incident by the light source is sent into the modulator through the optical fiber, and the interaction with the external measured parameters in the modulator causes the optical properties of the light such as the intensity, wavelength, frequency, phase, polarization state and the like of the light to change into the modulated optical signal, and then the modulated optical signal is sent into the photoelectric device through the optical fiber and the measured parameters are obtained after the optical signal is sent into the demodulator. Has the characteristics of high sensitivity, strong adaptability and the like.

The existing optical fiber sensor transmits in the optical fiber, the acting force of the measured object to the optical fiber is utilized to enable the phase, wavelength, deflection state and the like of the light beam in the optical fiber to change, and parameters are obtained after the light beam enters the demodulator, but the light beam can only be used for measuring relevant parameters such as the phase, the wavelength, the deflection and the like after the light beam enters the demodulator, the measured data is utilized to convert the deformation of the measured object, however, the deformation of the object cannot be directly measured, and the functions of detecting and alarming the deformation of the measured object are not provided.

Disclosure of Invention

The present utility model is directed to an optical fiber sensor for solving the above-mentioned problems.

In order to solve the technical problems, the utility model provides the following technical scheme: the optical fiber sensor comprises a shell, wherein at least one end of the shell is connected with an optical fiber, and a light source is arranged at one end of the shell, which is symmetrical to the optical fiber;

an extension shell is welded on the shell, a lens ring is arranged in the extension shell, a convex lens is fixedly arranged in the lens ring, and light rays of the light source pass through the convex lens and are concentrated on the optical fiber;

the lens ring can slide in the extension shell, and the lens ring and the extension shell are positioned by bolts, and the bolts are taken down when in use;

the outside of lens ring fixed mounting has the extension post, and the extension post runs through the lateral wall of extension shell to stretch to outside.

Preferably, the housing and one end of the concentrated light are fixedly provided with an optical signal receiver, and when the concentrated light deviates from the optical fiber, the light is irradiated on the optical signal receiver, and the optical signal receiver can detect the light.

Preferably, the light source is a laser fixedly arranged in the shell, and the light center of the laser coincides with the axis of the convex lens.

Preferably, the light source is an optical fiber fixedly mounted on the housing, the optical fiber being used for entering the light source; and the two optical fibers are symmetrically arranged.

Preferably, the bolts are provided in 3 numbers and uniformly distributed on the extension case together with the extension columns, and the adjacent intervals are 90 degrees.

Preferably, the extension shell is provided with a threaded hole for installing a bolt, the bolt penetrates through the side wall of the extension shell, and one end of the bolt positioned inside the extension shell is in contact with the lens ring.

Preferably, the lens ring and the convex lens are arranged concentrically with the housing.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the lens ring and the convex lens are arranged in the extending shell, the extending column is arranged in the lens ring, and the extending column is directly arranged in the measured object, so that after the measured object is deformed, the extending column can be directly carried to deform, and then the lens ring and the convex lens are carried to move, the focusing point of the convex lens can also move along with the convex lens, when the movement amount is too large, the focusing point can deviate from the optical fiber and directly irradiates the optical signal receiver, once the optical signal receiver detects a light beam signal, the deformation of the object is indicated to be too large, and the deformation of the object can be directly measured, so that the device can be used for warning of the deformation limit of the object;

by arranging the optical fiber, the parameters can be obtained by the demodulator when the light beam passes through the optical fiber.

Drawings

FIG. 1 is a diagram of the overall structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model employing a laser;

FIG. 3 is a cross-sectional view of the present utility model employing a light beam;

FIG. 4 is a side view of the extension case of the present utility model;

fig. 5 is a sectional view of the overall structure of the present utility model.

In the figure: 1. a housing; 2. an extension case; 3. a bolt; 4. an optical signal receiver; 5. an optical fiber; 6. a convex lens; 7. an extension column; 8. a lens ring; 9. a laser.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to the drawings, the embodiment discloses an optical fiber sensor, which comprises a housing 1, as shown in fig. 1, the housing 1 has a two-section structure, and an extension housing 2 is welded between the two sections of housing 1. An optical fiber 5 is attached to one end of the housing 1, and the end of the optical fiber 5 extends into the housing 1.

A light source is arranged at one symmetrical end of the shell 1 and the optical fiber 5; and light generated by the light source can enter the inside of the housing 1.

As shown in fig. 1 to 3, the lens ring 8 is mounted inside the extension case 2, only the lens ring 8 is in contact with the extension case 2, and there is no connection relationship, so that the lens ring 8 can slide in the extension case 2. The lens ring 8 is internally and fixedly provided with a convex lens 6, and the convex lens 6 is adhered to the inside of the lens ring 8 by glue to connect the lens ring 8 with the convex lens 6. The lens ring 8 and the convex lens 6 are arranged concentrically with the housing 1. The center line of the convex lens 6 and the axis of the light inlet of the optical fiber 5 are positioned on the same straight line. The light of the light source passes through the convex lens 6, is focused and concentrated at a point under the refraction of the convex lens 6, and the point directly irradiates the optical fiber 5 and is transmitted in the optical fiber 5.

Referring to fig. 4, the lens ring 8 is capable of sliding radially in the extension case 2, and the lens ring 8 is positioned between the extension case 2 by the bolts 3. As shown in fig. 4, the bolts 3 are provided in 3, and 3 bolts 3 are uniformly distributed on the extension case 2 together with the extension posts 7, with an interval of 90 degrees between adjacent ones.

When the housing 1 is mounted on a device to be inspected, such as a bridge to be inspected, or in concrete, as shown in fig. 5. After the shell 1 is installed, the bolts 3 are removed, and the limit on the lens ring 8 is released, so that the lens ring 8 can slide in the extension shell 2 when an external force acts. The lens ring 8 slides together with the convex lens 6, so that the focusing point of the convex lens 6 is deviated, that is, the point transmitted on the optical fiber 5 is also deviated, that is, the transmission angle of the light is changed, and thus the deformation is detected, and the detection adopts the prior art (for example, the change of the measured physical quantity can be known by measuring the change of the phase and the light intensity of the light passing through the optical fiber).

The lens ring 8 is fixedly provided with an extension column 7 on the outer side, and the extension column 7 penetrates through the side wall of the extension case 2 and extends to the outside. As shown in fig. 1-3. When the lens ring is installed, the extension column 7 is directly contacted with an object to be measured, the object directly transmits deformation to the extension column 7, and the extension column 7 can slide below the lens ring 8.

For example, when the bridge is inspected, the extension column 7 is poured into the concrete, and when the concrete is poured into the position of the bolt 3, the bolt needs to be removed. After the casting is completed, the extension column 7 and the concrete are cast together to support the lens ring 8. When the extension column 7 receives a deformation force of concrete, the position of the extension column 7 moves, and the lens ring 8 is directly slid, thereby changing the position of the convex lens 6.

In this embodiment, the light source is a laser 9 fixedly installed inside the housing 1, the light center of the laser 9 coincides with the axis of the convex lens 6, and the light emitted by the laser 9 is focused and concentrated at one point after being refracted by the convex lens 6. When the convex lens 6 moves, the focusing point moves along with the convex lens, so that the light entering the optical fiber 5 is shifted in position, and the incident position of the light source is changed.

The light source may be another optical fiber 5, in which the optical fiber 5 has an incident light source, and the optical fiber 5 is fixedly installed at the other end of the housing 1 and symmetrically arranged with the other optical fiber 5. The light in this optical fiber 5 is obliquely irradiated on the convex lens 6, and the refraction through the convex lens 6 passes through the focusing point of the convex lens 6, thereby entering the other optical fiber 5.

The position of the focal point will also be such that the position of the light incident on the optical fiber 5 will be changed when the convex lens 6 moves together with the lens ring 8.

In a further embodiment, the housing 1 and one end of the concentrated light are fixedly provided with an optical signal receiver 4, when the concentrated light deviates from the optical fiber 5, the concentrated light irradiates the optical signal receiver 4, the optical signal receiver 4 can detect the light, and the optical signal receiver 4 can convert the received optical signal into an electrical signal. The optical signal receiver 4 is a PIN photodiode and an avalanche diode (APD) which are commonly used in optical communication systems, and can be specifically set according to practical use requirements.

In this embodiment, the radius of the optical fiber 5 may be set as a limit value of the object shape variable. In normal use, the focal point of the convex lens 6 is centered at the center of the optical fiber 5 (i.e., the lens ring 8, convex lens 6, focal point and center of the optical fiber 5 are on the same line). When the measured object is deformed, the extension column 7 moves together with the lens ring 8 and the convex lens 6, so that the straight line formed by the lens ring 8, the convex lens 6 and the focusing point deviates from the circle center of the optical fiber 5. Once the focal point deviates from the optical fiber 5, it impinges on the optical signal receiver 4, and the optical signal receiver 4 receives an optical signal.

When the deformation of the measured object is too large, the extension column 7 carries the lens ring 8 and the convex lens 6 to slide in a relatively large displacement manner, so that the focusing point irradiates on the optical signal receiver 4. Once the optical signal receiver 4 receives the optical signal, it indicates that the deformation amount of the measured object is too large, and the measured object needs to be detected. Therefore, whether the deformation of the measured object is overlarge can be directly judged.

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

Claims

1. Optical fiber sensor, including casing (1), its characterized in that: at least one end of the shell (1) is connected with an optical fiber (5), and one symmetrical end of the shell (1) and the optical fiber (5) is provided with a light source;

an extension shell (2) is welded on the shell (1), a lens ring (8) is arranged in the extension shell (2), a convex lens (6) is fixedly arranged in the lens ring (8), and light rays of a light source penetrate through the convex lens (6) and are concentrated on the optical fiber (5);

the lens ring (8) can slide in the extension shell (2), the lens ring (8) and the extension shell (2) are positioned by the bolts (3), and the bolts (3) are removed when the lens ring is used;

the outer side of the lens ring (8) is fixedly provided with an extension column (7), and the extension column (7) penetrates through the side wall of the extension shell (2) and extends to the outside.

2. The fiber optic sensor of claim 1, wherein: the shell (1) and one end of the concentrated light are fixedly provided with the optical signal receiver (4), when the concentrated light deviates from the optical fiber (5), the concentrated light irradiates the optical signal receiver (4), and the optical signal receiver (4) can detect the light.

3. The fiber optic sensor of claim 1, wherein: the light source is a laser (9) fixedly arranged in the shell (1), and the light center of the laser (9) is overlapped with the axis of the convex lens (6).

4. The fiber optic sensor of claim 1, wherein: the light source is an optical fiber (5) fixedly arranged on the shell (1), and the optical fiber (5) is used for entering the light source; and the two optical fibers (5) are symmetrically arranged.

5. The fiber optic sensor of claim 1, wherein: the bolts (3) are arranged and uniformly distributed on the extension shell (2) together with the extension columns (7), and the adjacent intervals are 90 degrees.

6. The fiber optic sensor of claim 5, wherein: threaded holes for installing bolts (3) are formed in the extension shell (2), the bolts (3) penetrate through the side wall of the extension shell (2), and one end inside the extension shell (2) is in contact with the lens ring (8).

7. The fiber optic sensor of claim 5, wherein: the lens ring (8) and the convex lens (6) are arranged concentrically with the shell (1).