Optical fiber sensor

Abstract

The utility model discloses an optical fiber sensor which comprises an amplifier and an input port, an output port is fixedly installed at the lower right corner of the amplifier, an input optical fiber cable is inserted into the input port, an output optical fiber cable is inserted into the output port, the lower end of the output optical fiber cable is fixedly connected with an optical fiber head, and the lower end of the output optical fiber cable is fixedly connected with the optical fiber head. The outer side of the optical fiber head is in threaded connection with a connecting cylinder, an adjusting cylinder is fixedly installed on the outer side of the connecting cylinder, the inner wall of the adjusting cylinder is in threaded connection with a light gathering cylinder, and an upper convex lens and a lower convex lens are sequentially and fixedly installed on the inner wall of the light gathering cylinder from top to bottom. Under the condition that the focal length is smaller than the focal length, the closer the distance between the upper convex lens and the lower convex lens and the optical fiber head is, the larger the output light spot is, the farther the distance between the upper convex lens and the lower convex lens and the farther the output light spot is, the size of the light spot can be correspondingly adjusted according to the size of an object needing to be detected, the accuracy of detection data is ensured, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an optical fiber sensor. Background Art

[0002] A fiber optic sensor is a sensor that converts the state of the measured object into a measurable optical signal. The working principle of a fiber optic sensor is to send the incident light beam from the light source into the modulator through the optical fiber. The interaction with the external measured parameters in the modulator changes the optical properties of the light, such as the intensity, wavelength, frequency, phase, polarization state, etc., and becomes a modulated optical signal. The optical signal is then sent into the optoelectronic device through the optical fiber and the measured parameters are obtained after passing through the demodulator. During the whole process, the light beam is introduced through the optical fiber, passes through the modulator, and then emitted. The role of the optical fiber is first to transmit the light beam, and secondly to act as an optical modulator. The optical fiber and the amplifier constitute a fiber optic sensor. The optical fiber part consists of an optical fiber head and an optical fiber line.

[0003] The spot size of traditional fiber optic sensors cannot be adjusted, and the spot size cannot be adjusted accordingly according to the size of the object being detected. If the spot is too large or too small, it is easy to cause inaccurate detection data and low practicality. Therefore, we propose a new type of fiber optic sensor. Utility Model Content

[0004] The utility model provides an optical fiber sensor to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A fiber optic sensor comprises an amplifier, wherein an input port is fixedly installed at the lower left corner of the amplifier, an output port is fixedly installed at the lower right corner of the amplifier, an input optical fiber line is plugged into the interior of the input port, an output optical fiber line is plugged into the interior of the output port, an optical fiber head is fixedly connected to the lower end of the output optical fiber line, a connecting tube is threadedly connected to the outer side of the optical fiber head, an adjusting tube is fixedly installed on the outer side of the connecting tube, a focusing tube is threadedly connected to the inner wall of the adjusting tube, and an upper convex lens and a lower convex lens are fixedly installed on the inner wall of the focusing tube in sequence from top to bottom.

[0007] As a further improvement of the technical solution: the lower ends of the output optical fiber line and the input optical fiber line are both fixedly connected to the optical fiber head.

[0008] As a further improvement of the technical solution: the outer side of the optical fiber head is provided with screw threads, wherein the threads on the inner wall of the connecting tube and the screw threads on the outer side of the optical fiber head fit together.

[0009] As a further improvement of the technical solution: the upper convex lens and the lower convex lens are installed together in an overlapping manner, wherein the convex surface of the upper convex lens faces upwards, and the convex surface of the lower convex lens faces downwards.

[0010] As a further improvement of the technical solution: the length of the adjustment tube is greater than the length of the focusing tube.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The spot size of the optical fiber sensor is adjustable. Under the following premise, when it is less than the focal length, the closer the upper convex lens and the lower convex lens are to the optical fiber head, the larger the output spot is, and the farther the upper convex lens and the lower convex lens are from the optical fiber head, the smaller the output spot is. The spot size can be adjusted accordingly according to the size of the detected object to ensure the accuracy of the detection data and high practicality.

[0013] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the structure of the upper convex lens of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of the regulating cylinder of the utility model.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Amplifier; 2. Input port; 3. Output port; 4. Output optical fiber line; 5. Output optical fiber line; 6. Optical fiber head; 7. Connecting tube; 8. Adjusting tube; 9. Focusing tube; 10. Upper convex lens; 11. Lower convex lens. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] See also Figures 1 to 3 In an embodiment of the utility model, an optical fiber sensor includes an amplifier 1, an input port 2 is fixedly installed at the lower left corner of the amplifier 1, an output port 3 is fixedly installed at the lower right corner of the amplifier 1, an input optical fiber line 4 is plugged into the interior of the input port 2, an output optical fiber line 5 is plugged into the interior of the output port 3, an optical fiber head 6 is fixedly connected to the lower end of the output optical fiber line 5, a connecting tube 7 is threadedly connected to the outer side of the optical fiber head 6, an adjusting tube 8 is fixedly installed on the outer side of the connecting tube 7, a focusing tube 9 is threadedly connected to the inner wall of the adjusting tube 8, and an upper convex lens 10 and a lower convex lens 11 are fixedly installed on the inner wall of the focusing tube 9 from top to bottom.

[0024] See also Figure 1 The lower ends of the output optical fiber line 5 and the input optical fiber line 4 are fixedly connected to the optical fiber head 6. The light is transmitted to the optical fiber head 6 through the input optical fiber line 4 for output, and then the emitted light is transported back from the output optical fiber line 5 for analysis of the reflected light.

[0025] See also Figure 1-3The outer side of the optical fiber head 6 is provided with screw threads, wherein the threads on the inner wall of the connecting tube 7 fit with the screw threads on the outer side of the optical fiber head 6. By fitting the threads on the inner wall of the connecting tube 7 with the screw threads on the outer side of the optical fiber head 6, the connecting tube 7 can be threadedly installed on the optical fiber head 6 quickly and conveniently.

[0026] See also Figure 2 The upper convex lens 10 and the lower convex lens 11 are overlapped and installed together, wherein the convex surface of the upper convex lens 10 faces upward and the convex surface of the lower convex lens 11 faces downward. The upper convex lens 10 and the lower convex lens 11 can gather the light output by the optical fiber sensor to form a light spot, which is convenient for detecting objects.

[0027] See also Figure 1-3 The length of the adjustment tube 8 is greater than the length of the focusing tube 9. By setting the length of the adjustment tube 8 to be greater than the length of the focusing tube 9, it is possible to easily control the distance between the upper convex lens 10 and the lower convex lens 11 and the optical fiber head 6, thereby achieving the effect of adjusting the size of the light spot.

[0028] The working principle of the utility model is: when it is necessary to adjust the spot size of the optical fiber head 6 on the optical fiber sensor, directly install the connecting tube 7 on the optical fiber head 6 through the thread, and then adjust the spot size according to the size of the object to be measured. With the coordinated use of the adjusting tube 8 and the focusing tube 9, the focusing tube 9 can be rotated to adjust the distance between the upper convex lens 10 and the lower convex lens 11 and the optical fiber head 6. Under the following premise, when it is less than the focal length, the closer the upper convex lens 10 and the lower convex lens 11 are to the optical fiber head 6, the larger the output spot, and the farther the upper convex lens 10 and the lower convex lens 11 are from the optical fiber head 6, the smaller the output spot. The spot size of the optical fiber sensor is adjustable, and the size of the spot can be adjusted accordingly according to the size of the detected object, thereby ensuring the accuracy of the detection data and having high practicality.

[0029] The above description is only a preferred embodiment of the utility model and does not impose any form of limitation on the utility model. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. An optical fiber sensor, characterized in that: The invention comprises an amplifier (1), wherein an input port (2) is fixedly installed at the lower left corner of the amplifier (1), an output port (3) is fixedly installed at the lower right corner of the amplifier (1), an input optical fiber line (4) is plugged into the interior of the input port (2), an output optical fiber line (5) is plugged into the interior of the output port (3), an optical fiber head (6) is fixedly connected to the lower end of the output optical fiber line (5), a connecting tube (7) is threadedly connected to the outer side of the optical fiber head (6), an adjusting tube (8) is fixedly installed to the outer side of the connecting tube (7), a focusing tube (9) is threadedly connected to the inner wall of the adjusting tube (8), and an upper convex lens (10) and a lower convex lens (11) are fixedly installed on the inner wall of the focusing tube (9) in sequence from top to bottom.

2. The optical fiber sensor according to claim 1, characterized in that: The lower ends of the output optical fiber line (5) and the input optical fiber line (4) are both fixedly connected to the optical fiber head (6).

3. The optical fiber sensor according to claim 1, characterized in that: The outer side of the optical fiber head (6) is provided with screw threads, wherein the screw threads on the inner wall of the connecting tube (7) fit with the screw threads on the outer side of the optical fiber head (6).

4. The optical fiber sensor according to claim 1, characterized in that: The upper convex lens (10) and the lower convex lens (11) are mounted together in an overlapping manner, wherein the convex surface of the upper convex lens (10) faces upwards, and the convex surface of the lower convex lens (11) faces downwards.

5. The optical fiber sensor according to claim 1, characterized in that: The length of the adjustment tube (8) is greater than the length of the focusing tube (9).

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