Optical fiber pressure sensor based on optical power

Abstract

The utility model relates to an optical fiber pressure sensor based on optical power, comprising a housing, the back of the housing is provided with an installation groove, the installation groove is provided with a substrate, the surface of the substrate is horizontally provided with a light guide pipe, and the surface of the substrate is also provided with protection assemblies which are arranged at two sides of the light guide pipe; a signal transmitting assembly and a signal receiving assembly are further arranged in the shell, the signal transmitting assembly and the signal receiving assembly are connected with the two ends of the light guide pipe through wires respectively, a displayer is further arranged on the front face of the shell, and the displayer is electrically connected with the signal receiving assembly; the optical fiber sensor is improved on the basis of an existing optical fiber sensor, the passing rate of the optical fiber is used as a measurement basis, so that an instrument for obtaining the optical wavelength is not needed in the actual use process, the cost is greatly reduced, the structure is simpler, and the use is very convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor equipment, in particular to an optical fiber pressure sensor based on optical power. Background Art

[0002] Compared with traditional sensors, fiber optic sensors are gaining more and more attention because they can avoid electromagnetic interference, have no electrical connection, high resolution, high precision, and are easy to reuse and network. Fiber optic pressure sensors are small in size, simple in structure, fast in response speed, and highly reliable. They have high sensitivity due to the use of interference technology. They are an important fiber optic sensor that can be used for pressure measurement in special environments and have been widely used in many sensing fields.

[0003] At present, optical fiber sensors mainly use FBG light as a sensor, and obtain pressure or other data by measuring the change of light wavelength. However, the cost of the instrument for obtaining the light wavelength is very high, which leads to an increase in the production cost of the entire sensor. Therefore, a fiber optic pressure sensor with a simple structure and low production cost is needed. Utility Model Content

[0004] Based on the above description, the utility model provides an optical fiber pressure sensor based on optical power to solve the disadvantage that an instrument for acquiring wavelength is required in the existing optical fiber pressure sensor, resulting in a high manufacturing cost.

[0005] The utility model is realized through the following technical solutions:

[0006] An optical fiber pressure sensor based on optical power comprises a shell, a mounting groove is provided on the back of the shell, a substrate is provided on the mounting groove, a light guide is horizontally arranged on the surface of the substrate, and a protective component is also provided on the surface of the substrate and arranged on both sides of the light guide; a signal transmitting component and a signal receiving component are also provided inside the shell, and the signal transmitting component and the signal receiving component are respectively connected to the two ends of the light guide through wires, and a display is also provided on the front of the shell, and the display is electrically connected to the receiving component.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the mounting groove is a rectangular groove, and a metal plate is provided at the bottom of the mounting groove, and rectangular slots are provided on the four sides of the back of the substrate respectively. A magnet is embedded in each of the rectangular slots, and the magnet remains flush with the back of the substrate.

[0009] Furthermore, the protective component includes a plurality of dampers embedded in the surface of the substrate, and springs are sleeved on the telescopic rods of the plurality of dampers, and the two ends of the springs are respectively connected and fixed to the damper body and the end of the telescopic rod, and a partition is horizontally arranged on the end surface of the other end of the telescopic rod, and the center of the partition is hollowed out so that it can completely cover the light-emitting tube, and the top surface of the partition is lower than the top surface of the light-guiding tube.

[0010] Furthermore, the signal transmitting component includes a laser transmitter, and a beam splitter is provided on the output end of the laser transmitter. The tail end of the beam splitter is electrically connected to the light guide tube and the signal receiving component through two optical fibers.

[0011] Furthermore, the signal receiving component includes an optical path selector and two optical power calculators, and the optical fiber on the optical splitter and the optical fiber on the light guide are respectively connected to the two optical power calculators via the optical path selector.

[0012] Furthermore, the ends of the partition plate and the substrate adjacent to one side are provided with U-shaped grooves and are arranged opposite to each other, and the joints at both ends of the light-emitting tube are respectively embedded in the U-shaped grooves at both ends of the substrate.

[0013] Furthermore, movable joints are provided on the outer walls on both sides of the shell, and a handle is arranged above the shell with its two ends fixedly connected to the two movable joints respectively.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0015] 1. The present application is improved based on the existing optical fiber sensor, and adopts the passing rate of the optical fiber as the measurement basis. Therefore, in actual use, there is no need to use an instrument for obtaining the wavelength of light. Instead, the attenuated light source after passing through the gap of the light guide tube is compared with the normal light source to obtain the detection information. The required measuring equipment is an optical power calculator. Compared with the instrument used to obtain the wavelength of light, its cost is greatly reduced, and its structure is simpler. It can be used by simply connecting the above components, which is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the front structure of the housing in this embodiment;

[0017] Figure 2 Schematic diagram of the back structure of the housing in this embodiment;

[0018] Figure 3 Schematic diagram of the structure of the substrate in this embodiment;

[0019] Figure 4 Schematic diagram of the structure of the protection component in this embodiment;

[0020] Figure 5 Schematic diagram of the light source transmission structure of the signal transmitting component and the signal receiving component in this embodiment;

[0021] Figure 6 Schematic diagram of the internal structure of the housing in this embodiment;

[0022] Among them: 1. Shell; 11. Mounting slot; 12. Display; 2. Base plate; 3. Light guide; 4. Signal transmitting component; 41. Laser transmitter; 42. Spectrum splitter; 5. Signal receiving component; 51. Optical path selector; 52. Optical power calculator; 6. Protection component; 61. Damper; 62. Spring; 63. Partition; 7. U-shaped slot. DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] Combination Figure 1-6 As shown, an optical fiber pressure sensor based on optical power comprises:

[0026] The housing 1 is the main body of the entire sensor device and is used to fix and protect the internal components. A display 12 is also provided on the front thereof.

[0027] The substrate 2 is the installation base of the detection end, and is installed between the objects to be measured by means of attachment, so as to measure the pressure by means of direct contact. At the same time, the substrate 2 can be directly combined with the housing 1 when not in use;

[0028] Light pipe 3, a measuring component for optical power comparison, in this embodiment, light pipes 3 of models such as DS250, DS350, DS530, DS650, DS750, DS900, etc. can be used according to actual use requirements;

[0029] The protection component 6 is used to protect the light guide tube 3 to prevent it from being squeezed and broken when it exceeds the measurement range;

[0030] A signal emitting component 4, which is used to emit laser light to the inside of the device, thereby performing comparative detection by relying on the light source;

[0031] The signal receiving component 5 is a component for receiving the laser light that has passed through the light pipe 3 and the laser light that has not passed through the light pipe 3, and performing comparison and detection thereon.

[0032] Specifically, a rectangular mounting groove 11 is provided on the back of the shell 1, a metal plate is provided at the bottom of the mounting groove 11 and connected to the shell 1, and then the substrate 2 is placed in the mounting groove 11, and the end face of one end of the substrate 2 is connected to the outside. At the same time, in order to facilitate the staff to take and put, a plurality of rectangular grooves should be provided on the four sides of the back of the substrate 2, and a magnet is provided inside each groove, and its height is consistent with the back of the substrate 2; therefore, the staff can separate the two by sliding, and at the same time, the magnetism of the magnet can be used to combine and fix the two so that they can be carried and used.

[0033] The protective component 6 includes four dampers 61 arranged on the surface of the substrate 2, and the damper 61 is a small structure and its main body is embedded in the substrate 2, with only its telescopic end portion reserved for the outside. A spring 62 is sleeved on the telescopic end of the four dampers 61 to form a damping spring 62 structure, and the positions of the four dampers 61 are a rectangular frame, and a partition 63 is set at the top of the four dampers 61, so that the four dampers 61 are respectively located at the four corners of the partition 63.

[0034] The center of the partition 63 is hollowed out so that the hollowed-out part can completely expose the light guide 3, and the height of the partition 63 should also be lower than the top surface of the light guide 3 arranged on the surface of the substrate 2. This structure is used as a protective structure to prevent the light guide 3 from being broken due to excessive pressure. Therefore, in actual use, the partition 63 will not be subjected to force and move downward at the same time as the light guide 3 until the overall deformation of the light guide 3 is lower than the surface of the partition 63 until the maximum stroke of the damper 61. This stroke is also the maximum bearing capacity of the light guide 3, that is, the maximum detection range.

[0035] The signal transmitting component 4 includes a laser transmitter 41 (LI BS laser, YGA laser, etc. can be used), and a beam splitter 42 (PLC type - planar optical waveguide power splitter 42 can be used) is provided at the output end of the laser transmitter 41. Two optical fibers are provided at the tail end of the beam splitter 42, one of which is connected to the entrance end of the light guide 3.

[0036] The signal receiving component 5 includes an optical path selector 51 (NOS series can be selected) and two optical power calculators 52 (OPM150, OPM200, OPM500 and other models can be used). The other optical fiber on the optical splitter 42 and the optical fiber on the output end of the light guide 3 are connected to the two optical power calculators 52 via the optical path selector 51, that is, the corresponding values ​​between the two optical powers are calculated respectively, and displayed on the display screen on the top surface of the housing 1. At the same time, a corresponding calculator should be set inside the display screen to calculate the difference between the two, and the gap of the optical fiber inside the light guide 3 can be obtained by calculating the attenuation value of the optical power. In this way, the deformation of the light guide 3 is obtained, and finally the tension on the light guide 3 can be calculated.

[0037] Since the light guide tube 3 will be in direct contact with the object to be measured and squeezed, the joints at both ends of the light guide tube 3 connected to the optical fiber should be properly equipped with protective equipment, that is, U-shaped grooves 7 are provided at the ends of the partition plate 63 and the adjacent side of the substrate 2 and arranged relatively, and the joints at both ends of the light-emitting tube are respectively embedded in the U-shaped grooves 7 at both ends of the substrate 2, so as to prevent the interface from breaking during excessive squeezing, thereby causing the optical fiber to fall off.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solution from the technical solution of the embodiments of the utility model.

Claims

1. An optical fiber pressure sensor based on optical power, characterized in that: The invention comprises a shell (1), wherein a mounting groove (11) is provided on the back of the shell (1), a base plate (2) is provided on the mounting groove (11), a light guide tube (3) is arranged horizontally on the surface of the base plate (2), and a protective component (6) is also provided on the surface of the base plate (2) and is arranged on both sides of the light guide tube (3); a signal transmitting component (4) and a signal receiving component (5) are also provided inside the shell (1), and the signal transmitting component (4) and the signal receiving component (5) are respectively connected to the two ends of the light guide tube (3) through wires; a display (12) is also provided on the front of the shell (1), and the display (12) is electrically connected to the receiving component.

2. According to the optical power-based optical fiber pressure sensor described in claim 1, characterized in that: The installation groove (11) is a rectangular groove, and a metal plate is provided at the bottom of the installation groove (11). The four sides of the back side of the base plate (2) are respectively provided with rectangular slots, and a magnet is embedded in the interior of each of the rectangular slots, and the magnet is kept flush with the back side of the base plate (2).

3. The optical fiber pressure sensor based on optical power according to claim 1, characterized in that: The protection component (6) comprises a plurality of dampers (61) embedded in the surface of the substrate (2); the telescopic rods of the plurality of dampers (61) are all sleeved with springs (62); the two ends of the springs (62) are respectively connected and fixed to the damper (61) body and the end of the telescopic rod; a partition (63) is horizontally arranged on the end surface of the other end of the telescopic rod; the center of the partition (63) is hollowed out so that it can completely cover the light-emitting tube, and the top surface of the partition (63) is lower than the top surface of the light-guiding tube (3).

4. The optical fiber pressure sensor based on optical power according to claim 1, characterized in that: The signal transmitting component (4) comprises a laser transmitter (41), an optical splitter (42) is provided at the output end of the laser transmitter (41), and the tail end of the optical splitter (42) is electrically connected to the light guide (3) and the signal receiving component (5) respectively through two optical fibers.

5. The optical fiber pressure sensor based on optical power according to claim 4, characterized in that: The signal receiving component (5) comprises an optical path selector (51) and two optical power calculators (52), and the optical fiber on the optical splitter (42) and the optical fiber on the light guide (3) are respectively connected to the two optical power calculators (52) via the optical path selector (51).

6. The optical fiber pressure sensor based on optical power according to claim 3, characterized in that: The partition plate (63) and the substrate (2) are both provided with U-shaped grooves (7) at the ends adjacent to one side and are arranged opposite to each other. The joints at both ends of the light-emitting tube are respectively embedded in the U-shaped grooves (7) at both ends of the substrate (2).

7. The optical fiber pressure sensor based on optical power according to claim 1, characterized in that: Movable joints are also provided on the outer walls of both sides of the shell (1), and a handle is arranged above the shell (1) and its two ends are respectively fixedly connected to the two movable joints.

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