Fiber bragg grating flexible strain sensor

Abstract

The utility model provides a fiber grating flexible strain sensor comprising a sensor housing, two ends of the sensor housing are fixedly provided with fixing columns, the external part of each fixing column is fixedly provided with a fixing seat, the internal part of the upper end of each fixing seat is provided with a slot, the lower part of each fixing seat is integrally provided with a pedestal, and the pedestal is provided with a groove. A limiting rope assembly is installed between the sensor shell and the fixing base. The arrangement of the mounting bulge, the mounting groove, the pull rope and the second bolt is favorable for limiting the stretching lengths of the two ends of the sensor, so that the condition that the sensor is damaged due to excessive stretching is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to a fiber optic grating flexible strain sensor. Background Technology

[0002] A fiber Bragg grating flexible strain sensor is a sensor that uses fiber Bragg grating technology to measure strain. Its working principle is based on acousto-optic modulation and Bragg diffraction. Existing flexible fiber Bragg grating strain sensors include a sensor housing and two mounting mechanisms. Both ends of the sensor housing are fixedly connected to fixed posts, and both sides of the outer wall of the two fixed posts are provided with arc-shaped grooves. The two mounting mechanisms are fixedly connected to the same substrate. Each mounting mechanism includes a mounting box, and the top outer wall of the mounting box is fixedly connected to a mounting base. When using this type of fiber Bragg grating flexible strain sensor, when the tensile length at both ends of the sensor is long, it is easy to damage the sensor and affect its service life. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a fiber optic grating flexible strain sensor that limits the stretching length at both ends of the sensor to prevent damage caused by excessive stretching.

[0004] This utility model is achieved through the following technical solution:

[0005] A fiber Bragg grating flexible strain sensor includes a sensor housing, with fixed posts fixedly installed at both ends of the sensor housing. Each fixed post has a fixed base fixedly installed on its exterior. Each fixed base has a slot inside its upper end and a base integrally formed at the lower part of each fixed base. A limit rope assembly is installed between the sensor housing and the fixed base. The limit rope assembly includes a mounting protrusion and a pull rope. The mounting protrusion has a mounting groove inside, and one end of the pull rope is placed in the mounting groove and fixedly installed to the mounting protrusion by a second bolt.

[0006] Preferably, the two mounting protrusions are integrally disposed on the left and right sides of the middle part of the upper part of the sensor housing.

[0007] Preferably, the ends of the two pull cords furthest from the mounting protrusion are respectively disposed inside the two slots.

[0008] Preferably, one end of the pull rope inside the slot is connected to the fixing seat by a first bolt.

[0009] Preferably, the two ends of the pull rope are looped.

[0010] Preferably, mounting holes are provided inside both ends of the base.

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

[0012] In this invention, the installation protrusion, installation groove, pull rope, and second bolt are designed to limit the stretching length at both ends of the sensor, thus preventing damage to the sensor due to excessive stretching.

[0013] In this invention, the design of the fixing seat, base, and mounting holes facilitates the installation and fixing with the external components being inspected. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a structural schematic diagram of the limiting rope assembly of this utility model.

[0016] In the picture:

[0017] 1. Sensor housing; 2. Fixing post; 3. Fixing base; 31. Slot; 32. First bolt; 33. Base; 34. Mounting hole; 4. Limiting rope assembly; 41. Mounting protrusion; 42. Mounting groove; 43. Pull rope; 44. Second bolt. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings, as shown below. Figure 1 and attached Figure 2 As shown, a fiber Bragg grating flexible strain sensor includes a sensor housing 1. Fixing posts 2 are fixedly installed at both ends of the sensor housing 1. A fixing seat 3 is fixedly installed on the outside of each fixing post 2. A slot 31 is opened inside the upper end of each fixing seat 3. A base 33 is integrally provided at the lower part of each fixing seat 3. A limiting rope assembly 4 is installed between the sensor housing 1 and the fixing seat 3. The limiting rope assembly 4 includes a mounting protrusion 41 and a pull rope 43. A mounting groove 42 is opened inside the mounting protrusion 41. One end of the pull rope 43 is placed in the mounting groove 42 and fixedly installed to the mounting protrusion 41 by a second bolt 44. The user sets the length of the pull rope 43 according to the maximum tensile length of the sensor inside the sensor housing 1. When the maximum tensile length of the sensor inside the sensor housing 1 is about to be exceeded, the pull rope 43 tightens the sensor housing 1 and the fixing seat 3 to prevent damage to the sensor due to excessive stretching.

[0019] In this embodiment, specifically, the two mounting protrusions 41 are integrally disposed on the left and right sides of the middle part of the upper part of the sensor housing 1.

[0020] In this embodiment, specifically, the ends of the two pull ropes 43 that are away from the mounting protrusion 41 are respectively disposed inside the two slots 31.

[0021] In this embodiment, specifically, one end of the pull rope 43 located in the slot 31 is connected to the fixing seat 3 by the first bolt 32.

[0022] In this embodiment, specifically, the two ends of the pull rope 43 are looped.

[0023] In this embodiment, specifically, mounting holes 34 are provided inside both ends of the base 33.

[0024] Working principle

[0025] In this invention, the base 33 is connected and fixed to the component being tested through the mounting hole 34 and external bolts. The fixing column 2 facilitates the fixed installation of the sensor housing 1 and the fixing base 3. The limiting rope assembly 4 can limit the stretching length of the sensor inside the sensor housing 1.

[0026] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution of this utility model, falls within the protection scope of this utility model.

Claims

1. A fiber Bragg grating flexible strain sensor, characterized in that, The fiber optic flexible strain sensor includes a sensor housing (1), with fixed posts (2) fixedly installed at both ends of the sensor housing (1). Each fixed post (2) is fixedly installed with a fixed seat (3) on its exterior. Each fixed seat (3) has a slot (31) inside its upper end and a base (33) integrated at the lower part of each fixed seat (3). A limit rope assembly (4) is installed between the sensor housing (1) and the fixed seat (3). The limit rope assembly (4) includes a mounting protrusion (41) and a pull rope (43). The mounting protrusion (41) has a mounting groove (42) inside its interior. One end of the pull rope (43) is placed in the mounting groove (42) and fixedly installed to the mounting protrusion (41) by a second bolt (44).

2. The fiber Bragg grating flexible strain sensor as described in claim 1, characterized in that, The two mounting protrusions (41) are integrally set on the left and right sides of the middle part of the upper part of the sensor housing (1).

3. The fiber optic grating flexible strain sensor as described in claim 1, characterized in that, The ends of the two pull cords (43) away from the mounting protrusion (41) are respectively disposed inside the two slots (31).

4. The fiber optic grating flexible strain sensor as described in claim 1, characterized in that, The end of the pull rope (43) located in the slot (31) is connected to the fixing seat (3) by the first bolt (32).

5. The fiber optic grating flexible strain sensor as described in claim 1, characterized in that, The two ends of the pull rope (43) are looped.

6. The fiber Bragg grating flexible strain sensor as described in claim 1, characterized in that, The base (33) has mounting holes (34) inside both ends.

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