Interferometric integrated temperature and vibration optical fiber sensing demonstration device

Abstract

The utility model discloses an interference type integrated temperature and vibration optical fiber sensing demonstration device, relates to the field of optical fiber sensing demonstration teaching aids, aims to solve the problem that the prior art cannot give consideration to the temperature and vibration of the optical fiber sensing demonstration teaching aids, and adopts the technical scheme that an optical fiber double-beam interference experiment device is adopted, and experiment arms are arranged on a heating table and a vibration platform; the vibration platform drives the plate spring steel to reciprocate to form vibration through a stepping motor controlled by a frequency controller; and tail fibers of the experiment arm and the reference arm are fixed on a movable pipe of the optical fiber fixing mechanism and are provided with bolts for locking. Based on Young's double-slit interference and the MZI principle, the optical fiber sensing process is quantified and visualized, the principle can be deeply understood in the experiment process, operability is achieved, meanwhile, the experiment precision is guaranteed, experiment observation is facilitated, and meanwhile temperature and position changes can be rapidly calculated through stripe movement.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical fiber sensing demonstration teaching aid technical field, concretely is an interference type integrated temperature and vibration optical fiber sensing demonstration device. BACKGROUND

[0002] The existing university physics modern experiment uses WGX-11 optical fiber sensing experiment instrument, the device can make students clearly see that the interference fringe moves the change caused by the stress change of temperature, but the device cannot carry out quantitative calculation, and the limitation is big. INVENTION CONTENTS

[0003] The utility model solves the technical problem of overcoming the existing defects, and provides an interference type integrated temperature and vibration optical fiber sensing demonstration device, which can effectively solve the problems in the background art.

[0004] In order to realize the above-mentioned purpose, the utility model discloses an interference type integrated temperature and vibration optical fiber sensing demonstration device, adopts the technical scheme, including optical fiber double light beam interference experiment device, the optical fiber double light beam interference experiment device includes experiment arm and reference arm, the experiment arm below has the heating stage, can explore the influence of temperature on optical fiber interference fringe by starting the heating stage, the experiment arm has the optical fiber ring, the optical fiber ring below has the vibration platform, can explore the influence of vibration on optical fiber interference fringe;The vibration platform includes the frame, and the frame has the stepping motor, the stepping motor output end connects the transmission mechanism, the transmission mechanism connects the leaf spring steel, the leaf spring steel and the frame are connected, the optical fiber ring and the leaf spring steel are connected, the stepping motor is electrically connected with frequency controller, and the vibration frequency of vibration platform can be effectively controlled through the control of frequency controller;The tail fiber of experiment arm and reference arm is connected on the optical fiber fixing mechanism, the lens of optical fiber double light beam interference experiment device is installed on the optical fiber fixing mechanism, the tail fiber of experiment arm and reference arm is located on the focal point of the lens, and the optical fiber fixing mechanism can be more convenient for the fixation of tail fiber, and the focusing of experiment arm and reference arm at the focal point of the lens.

[0005] As a preferred technical scheme of the utility model, the transmission mechanism includes a connecting piece, one end of the connecting piece is fixedly connected with the output shaft of the stepping motor, the other end is hingedly connected with a connecting rod, the connecting rod is further hingedly connected with a hinged seat, the hinged seat is fixedly connected with the leaf spring steel, the output end of the stepping motor drives the connecting piece to rotate, the connecting piece drives the hinged seat to move up and down through the connecting rod transmission, so as to drive the leaf spring steel to vibrate.

[0006] As a preferred technical scheme of the utility model, the optical fiber fixing mechanism comprises a base, a supporting rod is connected to the base, a through hole is formed in the supporting rod, a movable tube is slidably connected in the through hole, a threaded hole is formed in the supporting rod and communicates with the through hole, a bolt is engaged in the threaded hole, and the end surface of the bolt is in sliding contact with the movable tube; the tail fibers of the experimental arm and the reference arm are fixed in the movable tube, the distance between the tail fibers of the experimental arm and the reference arm and the lens can be adjusted by sliding the movable tube in the through hole, so that the imaging effect is adjusted, and the position of the movable tube can be fixed by the bolt after being adjusted to a proper position.

[0007] As a preferred technical scheme of the utility model, the supporting rod is provided with a mounting seat, the lens is mounted on the mounting seat, and the lens is coaxial with the through hole, so that the focusing of the tail fiber is facilitated.

[0008] As a preferred technical scheme of the utility model, the movable tube has a columnar structure, and a slit is formed in the movable tube, the tail fibers of the experimental arm and the reference arm are in sliding contact in the slit, and a plug is mounted in the slit and in sliding contact with the tail fibers of the experimental arm and the reference arm. After the tail fibers are mounted in the slit, the plug is mounted to fix the tail fibers in the slit.

[0009] As a preferred technical scheme of the utility model, the optical fiber used in the optical fiber double-beam interference experimental device is a bare optical fiber, which is more sensitive to temperature and vibration than an optical fiber with an outer sheath.

[0010] As a preferred technical scheme of the utility model, the optical fiber used in the optical fiber double-beam interference experimental device is a 650nm optical fiber, and the diameter of the optical fiber ring is 2.32cm, which can ensure the vibration sensitivity and minimize the attenuation of the optical signal in the vibration process, thereby ensuring the accuracy of the vibration measurement.

[0011] Compared with the prior art, the utility model has the advantages that: the utility model discloses a quantitative visualization of the process of optical fiber sensing based on Young's double-slit interference and MZI principle, which is beneficial to the in-depth understanding of the principle during the experiment, realizes the operability while ensuring the accuracy of the experiment, uses bare optical fiber for light transmission, sets the bare optical fiber on the heating table and vibration platform, can accurately and sensitively feedback the influence of temperature and vibration on the optical fiber interference fringe, thereby facilitating experimental observation, and the temperature and position change can be calculated quickly through the movement of the fringe, the vibration platform adopts a stepping motor and a transmission mechanism to drive a leaf spring steel vibration, thereby forming a vibration factor under the optical fiber ring of the optical fiber, and the vibration factor of the demonstration device is more controllable, the tail fiber of the experimental arm and reference arm is fixed by using the optical fiber fixing mechanism, not only makes the fixation of the tail fiber more simple and stable, but also is more convenient for adjusting the spacing between the tail fiber and the lens, and can ensure that the tail fiber can produce clear interference fringes. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the utility model structure schematic diagram;

[0013] Figure 2 It is the utility model vibration platform structure schematic diagram of Figure 1 ;

[0014] Figure 3 It is the utility model vibration platform structure schematic diagram of Figure 2 ;

[0015] Figure 4 It is the utility model transmission mechanism structure schematic diagram of Figure 1 ;

[0016] Figure 2 It is the utility model transmission mechanism structure schematic diagram of Figure 6 ;

[0017] Figure 1 It is the utility model optical fiber fixing mechanism structure schematic diagram of Figure 7 ;

[0018] Figure 2 It is the utility model optical fiber fixing mechanism structure schematic diagram of Figure 8 ;

[0019] Figure 9 It is the utility model movable pipe structure schematic diagram;

[0020] Figure 10 It is the utility model movable pipe side view structure schematic diagram;

[0021] Figure 11 It is the A-A section structure schematic view of the utility model;

[0022] Figure 12 It is the temperature change graph with time of embodiment 1 of the utility model;

[0023] Figures 1 to 10 It is the vibration position change graph with time of embodiment 1 of the utility model.

[0024] In the drawing: 1, light source;2, one-to-two optical fiber coupler;3, experimental arm;301, optical fiber ring;4, reference arm;5, optical fiber fixing mechanism;501, base;502, support rod;503, mounting seat;504, lens;505, movable tube;5051, slit;506, bolt;507, baffle;6, CCD;7, computer;8, heating table;9, vibration platform;901, rack;902, stepper motor;903, transmission mechanism;931, connecting piece;932, connecting rod;933, hinged seat;904, leaf spring steel. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. Embodiment 1

[0026] As Figure 6 shown, the utility model discloses an interference type integrated temperature and vibration optical fiber sensing demonstration device, adopts the technical scheme, including optical fiber double light beam interference experimental device, it includes light source 1, light source 1 has adopted 650nm waveband's laser pen, its laser emission end is connected the input end of one-to-two optical fiber coupler 2 through optical fiber, the two output ends of one-to-two optical fiber coupler 2 are connected with an optical fiber respectively, are experimental arm 3 and reference arm 4, the optical fiber ring 301 is wound on experimental arm 3, uses thin line to bundle optical fiber ring 301 to maintain its bending form, in order to be able to obtain interference fringe image, the tail fiber of experimental arm 3 and reference arm 4 is fixed on optical fiber fixing mechanism 5, as Figure 7 、 Figure 8As shown, the optical fiber fixing mechanism 5 includes a base 501, the base 501 is provided with a support rod 502, the support rod 502 is provided with an L-shaped mounting seat 503, the mounting seat 503 is provided with a circular mounting hole, and the lens 504 is mounted in the mounting hole. In order to position the pigtail, a through hole is formed in the support rod 502, the through hole is coaxial with the mounting hole, and the movable tube 505 is slidably connected in the through hole, as shown Figure 9 、 Figure 10 、 Figure 2 As shown, the movable tube 505 is a columnar structure, a slit 5051 is formed in the curved surface of the movable tube 505, the two ends of the slit 5051 are connected with the outside at the end surface of the movable tube 505, the pigtail is arranged in the slit 5051, and the plug 507 is arranged in the slit 5051 in order to fix the pigtail in the slit 5051. In order to obtain clearer interference fringe images, the movable tube 505 needs to be moved in the through hole to adjust the distance between the pigtail and the lens 504, so that the light wave exit point of the pigtail is located on the focal point of the lens 504 as much as possible. After adjusting the position of the movable tube 505, in order to position the movable tube 505, a threaded hole is formed in the end surface of the support rod 502 and penetrates the through hole, and the bolt 506 is engaged in the threaded hole, and the end surface of the bolt 506 is in sliding contact with the movable tube 505. The CCD 6 is arranged at the rear end of the lens 504, and the computer 7 is connected to the rear end of the CCD 6 through an optical fiber.

[0027] In order to facilitate the demonstration of the influence of temperature and vibration on the optical fiber interference fringes, the optical fiber of the experimental arm 3 is pasted on the heating platform of the heating table 8 by using adhesive tape, and the optical fiber ring 301 is fixed on the vibration platform 9, as shown Figure 3 、 Figure 4 As shown, the vibration platform 9 includes a rack 901, the rack 901 is provided with a stepping motor 902, the output end of the stepping motor 902 is connected with a transmission mechanism 903, as shown Figure 5 、 Figure 11 As shown, the transmission mechanism 903 includes a connecting piece 931, one end of the connecting piece 931 is fixedly connected with the output shaft of the stepping motor 902, the other end of the connecting piece 931 is hingedly connected with one end of a connecting rod 932, the other end of the connecting rod 932 is hingedly connected with a hinged seat 933, the hinged seat 933 is L-shaped, the vertical section of the hinged seat 933 is hingedly connected with the connecting rod 932, and the horizontal section of the hinged seat 933 is fixedly connected with one end of a leaf spring steel 904, the other end of the leaf spring steel 904 is fixedly connected on the rack 901, and the stepping motor 902 is electrically connected with a frequency controller. The optical fiber ring 301 is fixed on the leaf spring steel 904 by using adhesive tape.

[0028] The optical fiber used in the embodiment is a single-mode optical fiber with a core diameter of 8.2 μm, a cladding diameter of 125 μm, and a transmission light wavelength of 650 nm. Considering that the optical fiber with an outer sheath is not sensitive to temperature and vibration, in order to improve the sensitivity of the sensor, bare optical fiber is selected. In order to reduce the light signal attenuation in the vibration process as much as possible while ensuring the vibration sensitivity, the diameter of the optical fiber ring 301 is maintained at 2.32 cm.

[0029] The working principle of the utility model discloses:

[0030] The tail fiber of the experimental arm 3 and the reference arm 4 is installed in the slit 5051 of the movable tube 505 of the optical fiber fixing mechanism 5, and is fixed by using the plug 507. The light source 1 is turned on, and 650 nm laser is emitted. The laser is transmitted to the one-to-two optical fiber coupler 2 for light splitting treatment. The laser enters the experimental arm 3 and the reference arm 4. The distance between the movable tube 505 and the lens 504 is adjusted to present a clear interference fringe image on the screen of the computer 7. The bolt 506 is screwed to fix the movable tube 505. The platform temperature of the heating table 8 is detected by using the thermocouple. After ensuring that the platform temperature is at room temperature, the screen recording of the computer 7 is started. The switch of the heating table 8 is turned on, and the heating temperature is set to 80 DEG C. The stepping motor 902 is started by operating the frequency controller. The connecting piece 931 of the transmission mechanism 903 is driven to rotate by the stepping motor 902. The connecting piece 931 is driven to rotate by the connecting rod 932. The optical fiber ring 301 is driven to vibrate up and down by the plate spring steel 904.

[0031] After the temperature of the heating table 8 rises to the set temperature, the screen recording of the computer 7 is ended, and the heating table 8 and the frequency controller are turned off. The collected video is imported into the Tracker software for image processing to obtain the collected data.

[0032] The collected data is imported into the Origin software. By using the existing data analysis method, the temperature-time change graph as shown in Figure 12 and the vibration position-time change graph as shown in ​ can be obtained. It can be observed that the vibration pattern is in the form of floating oscillation, and the temperature pattern is in the form of linear trend rising.

[0033] The circuit and mechanical connection involved in the utility model are the common means adopted by the person skilled in the art. Technical inspiration can be obtained through a limited number of tests, and it belongs to the public knowledge.

[0034] The heating table 8 and the frequency controller used in the present application are products that can be purchased on the market. The other components not described in detail are prior art.

[0035] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated temperature and vibration fiber-optic sensing demonstration device of the interferometric type, comprising a fiber-optic two-beam interference experimental device, said fiber-optic two-beam interference experimental device comprising an experimental arm (3) and a reference arm (4), characterized in that: The experimental arm (3) is below a heating table (8), the experimental arm (3) has a fiber ring (301), and the fiber ring (301) is below a vibration platform (9); the vibration platform (9) comprises a rack (901), the rack (901) has a stepping motor (902), the stepping motor (902) is connected with a transmission mechanism (903), the transmission mechanism (903) is connected with a leaf spring steel (904), the leaf spring steel (904) is connected with the rack (901), the fiber ring (301) is connected with the leaf spring steel (904), and the stepping motor (902) is electrically connected with a frequency controller; tail fibers of the experimental arm (3) and the reference arm (4) are connected on a fiber fixing mechanism (5), the fiber fixing mechanism (5) is provided with a lens (504) of the fiber double-beam interference experimental device, and the tail fibers of the experimental arm (3) and the reference arm (4) are located on focal points of the lens (504).

2. The interferometric integrated temperature and vibration optical fiber sensing demonstration device of claim 1, wherein: The transmission mechanism (903) comprises a connecting piece (931), one end of the connecting piece (931) is fixedly connected with an output shaft of the stepping motor (902), the other end is hingedly connected with a connecting rod (932), the connecting rod (932) is further hingedly connected with a hinged seat (933), and the hinged seat (933) is fixedly connected with the leaf spring steel (904).

3. The interferometric integrated temperature and vibration fiber sensing demonstration device of claim 1, wherein: The fiber fixing mechanism (5) comprises a base (501), the base (501) is connected with a supporting rod (502), the supporting rod (502) is provided with a through hole, a movable tube (505) is slidably connected in the through hole, the supporting rod (502) is further provided with a threaded hole communicated with the through hole, a bolt (506) is engaged in the threaded hole, and an end surface of the bolt (506) is in sliding contact with the movable tube (505); tail fibers of the experimental arm (3) and the reference arm (4) are fixed in the movable tube (505).

4. The interferometric integrated temperature and vibration fiber sensing demonstration device of claim 3, wherein: The supporting rod (502) is provided with a mounting seat (503), the mounting seat (503) is provided with the lens (504), and the lens (504) is coaxial with the through hole.

5. An interferometric integrated temperature and vibration optical fibre sensing demonstration apparatus according to claim 3 or 4, characterised in that: The movable tube (505) has a columnar structure, the movable tube (505) is provided with a slit (5051), tail fibers of the experimental arm (3) and the reference arm (4) are in sliding contact in the slit (5051), and the slit (5051) is provided with a blocking piece (507), the blocking piece (507) is in sliding contact with the tail fibers of the experimental arm (3) and the reference arm (4).

6. The interferometric integrated temperature and vibration fiber sensing demonstration device of claim 1, wherein: The fiber used in the fiber double-beam interference experimental device is a bare fiber.

7. The interferometric integrated temperature and vibration fiber sensing demonstration device according to claim 1 or 6, characterized in that: The fiber used in the fiber double-beam interference experimental device is a 650nm fiber, and the diameter of the fiber ring (301) is 2.32cm.

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