Internal structure of fiber laser vibration sensor

Abstract

The utility model discloses an internal structure of an optical fiber laser vibration sensor, which relates to the technical field of optical fiber sensing and comprises a shell, a fixing table is arranged on one side of the lower end in the shell, one end of a supporting rod is arranged in the middle of the upper end of the fixing table, and an ejector pin is arranged at the other end of the supporting rod and in the middle of the interior of the shell. The upper end of the ejector pin is provided with a vertical beam, the lower end of the vertical beam is provided with a hoisting seat, the lower end of the hoisting seat is connected with a balancing weight through threads, one side of the upper end of the vertical beam is provided with one end of an optical fiber, the other end of the optical fiber is fixedly connected with the shell, and the other side of the upper end of the vertical beam is provided with a distributed feedback optical fiber laser. The balancing weight rotates around the supporting rod and the supporting seat relative to the shell under the action of inertia force, so that the DFBFL connected with the vertical beam is pulled through the vertical beam, the axial strain of the DFBFL is changed, the central wavelength of the DFBFL is changed, and the response is made to tiny vibration.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber sensing, in particular to an internal structure of an optical fiber laser vibration sensor. Background Art

[0002] The basic working principle of the fiber optic sensor is to send the light from the light source into the modulator through the optical fiber, so that the measured parameter interacts with the light entering the modulation area, causing the optical properties of the light (such as light intensity, wavelength, frequency, phase, polarization state, etc.) to change, which is called modulated signal light. Then, the influence of the measured value on the transmission characteristics of the light is used to complete the measurement. Traditional fiber optic laser vibration sensors cannot meet the accuracy requirements of grouting detection and comprehensive positioning survey of empty areas, and cannot respond to small vibrations in a timely manner. Utility Model Content

[0003] The purpose of the utility model is to provide an internal structure of a fiber laser vibration sensor to solve the problem that the traditional fiber laser vibration sensor mentioned in the above background technology cannot meet the accuracy requirements of grouting detection and comprehensive positioning and exploration of empty areas, and cannot respond to tiny vibrations in time.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an internal structure of an optical fiber laser vibration sensor, comprising a shell, a fixed platform is provided on one side of the inner lower end of the shell, one end of a support rod is provided at the middle position of the upper end of the fixed platform, a pin is provided at the other end of the support rod and at the inner middle position of the shell, a vertical beam is provided at the upper end of the pin, a hanging seat is provided at the lower end of the vertical beam, a fixing button is provided at the lower end of the vertical beam, the fixing button is fixedly connected to the hanging seat by a thread, a counterweight is connected to the lower end of the hanging seat by a thread, one end of an optical fiber is provided on one side of the upper end of the vertical beam, the other end of the optical fiber is fixedly connected to the shell, a distributed feedback optical fiber laser is provided on the other side of the upper end of the vertical beam, a support seat is provided at the lower end of the vertical beam, and the upper end of the pin is against the inside of the support seat.

[0005] Preferably, a through slot is provided at the upper end of the lifting seat along the direction of the support rod, the support rod and the ejector pin extend into the through slot, the support rod is concentrically arranged with the through slot, and the lower end of the support seat extends into the inner upper end of the through slot.

[0006] Preferably, a fixing edge is provided at the outer edge of the lower end of the vertical beam, and the upper end of the fixing button abuts against the fixing edge.

[0007] Preferably, the outer diameter of the support seat is consistent with the inner diameter of the through groove.

[0008] Preferably, a weight-reducing groove is provided at the upper end of the vertical beam.

[0009] Compared with the prior art, the beneficial effects of the utility model are: a DFB-FL fiber laser detector model based on a support rod connection is adopted, and a counterweight block is used as an inertial sensitive element, which is connected to the sensor housing through a support rod and a support seat, and a vertical beam structure is arranged on the counterweight block, one end of the optical fiber is fixed on the vertical beam, and the other end is fixed on the shell. When the shell vibrates with an external micro-vibration signal, the counterweight block rotates around the support rod and the support seat relative to the shell under the action of the inertial force, thereby pulling the DFBFL connected thereto through the vertical beam, causing its axial strain to change, resulting in a change in the central wavelength of the DFB-FL, thereby responding to tiny vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an axonometric cross-sectional view of the main structure of the utility model;

[0011] Figure 2 This is an axonometric cross-sectional view of the vertical beam structure of the utility model;

[0012] Figure 3 This is a front cross-sectional view of the main structure of the utility model;

[0013] Figure 4 It is a left side sectional view of the main structure of the utility model.

[0014] In the figure: 1-shell, 2-fixed platform, 3-support rod, 4-thimble, 5-vertical beam, 6-lifting seat, 7-fixed button, 8-counterweight block, 9-optical fiber, 10-distributed feedback fiber laser, 11-support seat, 12-through groove, 13-fixed edge, 14-weight reduction groove. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-4The utility model provides an internal structure of a fiber laser vibration sensor, comprising a shell 1, a fixed platform 2 is provided on one side of the lower end of the shell 1, one end of a support rod 3 is provided at the middle position of the upper end of the fixed platform 2, a pin 4 is provided at the other end of the support rod 3 and at the middle position of the shell 1, a vertical beam 5 is provided on the upper end of the pin 4, a hanging seat 6 is provided on the lower end of the vertical beam 5, a fixing button 7 is provided on the lower end of the vertical beam 5, the fixing button 7 is fixedly connected to the hanging seat 6 through a thread, a counterweight 8 is connected to the lower end of the hanging seat 6 through a thread, one end of an optical fiber 9 is provided on one side of the upper end of the vertical beam 5, the other end of the optical fiber 9 is fixedly connected to the shell 1, a distributed feedback fiber laser 10 is provided on the other side of the upper end of the vertical beam 5, a supporting seat 11 is provided at the lower end of the vertical beam 5, and the upper end of the pin 4 is against the inside of the supporting seat 11.

[0017] When in use, the shell 1 is set to the position to be monitored, the support rod 3 is fixed to the inside of the shell 1 through the fixing platform 2, the counterweight 8 is suspended to the lower end of the support rod 3 through the hanging seat 6, and the ejector pin 4 is against the inside of the support seat 11. Through the ejector pin 4 and the support seat 11, the vertical beam 5, the hanging seat 6 and the counterweight 8 are suspended on the support rod 3 and in the middle position inside the shell 1. The counterweight 8 serves as an inertial sensitive element. A vertical beam 5 structure is set at the upper end of the counterweight 8. The vertical beam 5 is fixed to the upper end of the hanging seat 6 through the fixing button 7. One end of the optical fiber 9 is fixed to the vertical beam 5, and the other end is fixed to the shell 1. When the shell 1 vibrates with an external micro-vibration signal, the counterweight 8 rotates around the support rod 3 relative to the outer shell 1 under the action of the inertial force, thereby pulling the distributed feedback fiber laser 10 connected thereto through the vertical beam 5, causing its axial strain to change, resulting in a change in the central wavelength of the DFB-FL, thereby responding to the tiny vibration.

[0018] The upper end of the hanging seat 6 is provided with a through groove 12 along the direction of the support rod 3, the support rod 3 and the ejector pin 4 extend into the interior of the through groove 12, the support rod 3 and the through groove 12 are arranged concentrically, and the lower end of the support seat 11 extends into the inner upper end of the through groove 12. By arranging the through groove 12 on the hanging seat 6, the support rod 3 can penetrate the hanging seat 6, and space is left for the support rod 3 to move inside the hanging seat 6.

[0019] A fixing edge 13 is provided at the outer edge of the lower end of the vertical beam 5 , and the upper end of the fixing button 7 abuts against the fixing edge 13 . The fixing button 7 is engaged with the fixing edge 13 to fix the vertical beam 5 to the upper end of the hanging seat 6 .

[0020] The outer diameter of the support seat 11 is consistent with the inner diameter of the through slot 12 , so that the vertical beam 5 can be connected to the hanging seat 6 through the clamping connection between the support seat 11 and the through slot 12 , and provide support for the connection between the fixing button 7 and the hanging seat 6 .

[0021] A weight-reducing groove 14 is provided at the upper end of the vertical beam 5 to reduce the overall weight of the vertical beam 5 .

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal structure of a fiber laser vibration sensor, characterized by: The invention comprises a shell (1), a fixing platform (2) is provided on one side of the lower end of the interior of the shell (1), one end of a support rod (3) is provided at the middle position of the upper end of the fixing platform (2), a thimble (4) is provided at the other end of the support rod (3) and at the middle position of the interior of the shell (1), a vertical beam (5) is provided at the upper end of the thimble (4), a hanging seat (6) is provided at the lower end of the vertical beam (5), a fixing button (7) is provided at the lower end of the vertical beam (5), and the fixing button (7) is screwed in The thread is fixedly connected to the hanging seat (6), the lower end of the hanging seat (6) is connected to a counterweight (8) through a thread, one end of an optical fiber (9) is provided on one side of the upper end of the vertical beam (5), the other end of the optical fiber (9) is fixedly connected to the shell (1), a distributed feedback fiber laser (10) is provided on the other side of the upper end of the vertical beam (5), a support seat (11) is provided at the lower end of the vertical beam (5), and the upper end of the ejector pin (4) is against the inside of the support seat (11).

2. The internal structure of the optical fiber laser vibration sensor according to claim 1, characterized in that: The upper end of the hanging seat (6) is provided with a through groove (12) extending along the direction of the support rod (3); the support rod (3) and the ejector pin (4) extend into the interior of the through groove (12); the support rod (3) and the through groove (12) are concentrically arranged; the lower end of the support seat (11) extends into the inner upper end of the through groove (12).

3. The internal structure of the optical fiber laser vibration sensor according to claim 1, characterized in that: A fixed edge (13) is provided at the outer edge of the lower end of the vertical beam (5), and the upper end of the fixing button (7) abuts against the fixed edge (13).

4. The internal structure of the optical fiber laser vibration sensor according to claim 2, characterized in that: The outer diameter of the support seat (11) is consistent with the inner diameter of the through groove (12).

5. The internal structure of the optical fiber laser vibration sensor according to claim 1, characterized in that: A weight-reducing groove (14) is provided at the upper end of the vertical beam (5).

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