Pressure detection device based on fiber grating technology

Abstract

The utility model relates to an optical fiber technology, in particular to a pressure detection device based on an optical fiber grating technology, which comprises an optical fiber grating strain gauge. The first bearing part is arranged on the upper side of the second bearing part and is suspended; the connecting piece is connected with the first bearing piece and the second bearing piece; the fiber bragg grating strain gauges are arranged on the two sides of the connecting piece respectively, the upper ends of the fiber bragg grating strain gauges make contact with the suspended first bearing piece, and the lower ends of the fiber bragg grating strain gauges make contact with the second bearing piece. The pressure sensor has the advantages of explosion prevention, electromagnetic interference resistance, high sensitivity and the like, and is applied to pressure detection such as weighing.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical fiber technology, especially based on pressure detection device of fiber grating technology. BACKGROUND

[0002] Although the traditional piezoelectric dynamic weighing sensor realizes rapid weighing, still has many limitations, such as not essential explosion -proof, poor anti - electromagnetic interference performance, measurement distance is nearer, long - term reliability is poor.

[0003] Fiber grating is a new type of sensing element developed in recent years, can realize non - electric measurement, compared with traditional sensor has many advantages, such as anti - electromagnetic interference, corrosion - resistant, electrical insulation, high sensitivity, long - term stability is good, has extensive application prospect.

[0004] But how will fiber grating technology be applied in pressure detection, still faces some problems, such as installation position, structure design etc. SUMMARY

[0005] To solve the above prior art scheme's insufficient, the utility model provides a kind of pressure detection device based on fiber grating technology.

[0006] The utility model aims to realize by the following technical scheme:

[0007] Pressure detection device based on fiber grating technology, including fiber grating strain gauge;Still include:

[0008] First bearing and second bearing, the first bearing is set on the upside of the second bearing, and is suspended;

[0009] Connecting piece, the connecting piece connects the first bearing and second bearing;

[0010] The fiber grating strain gauge is respectively arranged in the two sides of the connecting piece, and upper end contacts the first bearing suspended, lower end contacts the second bearing.

[0011] Compared with prior art, the utility model has the beneficial effects that:

[0012] 1. explosion -proof;

[0013] Use fiber grating strain gauge, and upper end and lower end are connected with the first bearing suspended and the second bearing respectively, realize essential safety explosion -proof, resist electromagnetic interference;

[0014] 2. multifunctional;

[0015] Utilize fiber grating strain gauge arranged in the two sides of connecting piece, not only realize pressure detection, but also realize identifying vehicle advancing direction when vehicle weighing;

[0016] 3. High sensitivity, good stability;

[0017] Optical fiber grating technology is used, and the pressure detection device is electrically insulated, high in sensitivity and good in stability. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosure of the present application will become more readily understood by referring to the accompanying drawings. It is readily understood by those skilled in the art that these drawings are merely for the purpose of illustrating the technical solutions of the present application and are not intended to limit the scope of protection of the present application. In the drawings:

[0019] Fig. 1 is a structural diagram of a pressure detection device according to an embodiment of the present application;

[0020] Fig. 2 is a sectional view of the pressure detection device according to the embodiment of the present application. DETAILED DESCRIPTION

[0021] Figs. 1-2 The optional specific embodiments of the present application are described in the following description and accompanying drawings to teach those skilled in the art how to make and use the present application. Some conventional aspects have been simplified or omitted in order to explain the technical solutions of the present application. Those skilled in the art should understand that variations or replacements derived from these specific embodiments will be within the scope of the present application. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present application. Therefore, the present application is not limited to the following optional specific embodiments, but is only defined by the claims and their equivalents.

[0022] Embodiment 1

[0023] The structural diagram of the pressure detection device based on the optical fiber grating technology according to the embodiment of the present application is shown in Fig. 1 and includes:

[0024] The first bearing 12 is arranged on the upper side of the second bearing 11 and is suspended;

[0025] The connecting piece 13 connects the first bearing 12 and the second bearing 11;

[0026] The optical fiber grating strain gauge 21 is arranged on both sides of the connecting piece 13, and the upper end contacts the suspended first bearing 12, and the lower end contacts the second bearing 11. When the first bearing 12 is pressed, the optical fiber grating strain gauge deforms, and the changed optical signal is sent to a demodulator to obtain the pressure applied to the first bearing 12.

[0027] In order to realize sealing, prevent external sand from entering between the first carrier 12 and the second carrier 11, further, the end of the first carrier 12 away from the connecting piece 13 has a downward extending first closing part 121, the end of the second carrier 11 away from the connecting piece 13 has an upward extending second closing part 111, and the second closing part 111 and the first closing part 121 have a gap therebetween.

[0028] In order to realize sealing, further, the rubber strip 31 is arranged in the gap.

[0029] In order to conveniently install the fiber grating strain gauge 21, further, the bottom end of the first carrier 12 has a downward first protrusion 122, the upper end of the second carrier 11 has an upward second protrusion 112, and the fiber grating strain gauge 21 is arranged between the first protrusion 122 and the second protrusion 112.

[0030] In order to facilitate manufacturing, further, the first protrusion 122 and the second protrusion 112 are strip-shaped protrusions.

[0031] In order to fix the first carrier 12, further, the bottom end of the second carrier 11 is provided with a positioning groove 113.

[0032] In order to facilitate manufacturing, further, the first carrier 12, the connecting piece 13 and the second carrier 11 are respectively in a flat plate shape, and the fiber grating strain gauge 21 is in a columnar shape.

[0033] Embodiment 2

[0034] The application example of the pressure detection device based on the fiber grating technology in the vehicle weighing according to the embodiment 1 of the utility model.

[0035] In the application example, as shown in Figs. 1-2 The first carrier 12, the second carrier 11 and the connecting piece 13 are all in a flat plate shape and are made of steel. The upper end and the lower end of the connecting piece 13 are respectively connected with the middle part of the first carrier 12 and the middle part of the second carrier 11 through welding, so that the first carrier 12 is suspended on both sides of the connecting piece 13. The bottom end of the two suspended ends has a strip-shaped first protrusion 122 extending in the front-rear direction, and correspondingly, the upper end of the second carrier 11 has a strip-shaped second protrusion 112 extending in the front-rear direction.

[0036] The end of the first carrier 12 away from the connecting piece has a downward first closing part 121, and correspondingly, the end of the second carrier 11 away from the connecting piece 13 has an upward extending second closing part 111, and the second closing part 111 and the first closing part 121 have a gap therebetween, and the rubber strip 31 is filled in the gap, so that sealing is realized.

[0037] The bottom end of the first bearing 11 has a positioning slot 113, specifically a dovetail slot, for positioning and fixing the first bearing 11.

[0038] The upper end of the columnar fiber grating strain gauge 21 is welded to the bottom wall of the first protrusion 122, and the lower end is welded to the top wall of the second protrusion 112. The two fiber grating strain gauges 21 are symmetrically arranged about the connecting piece 13. The fiber grating strain gauge 21 is connected to the optical fiber and the demodulator.

[0039] The working mode of the pressure detection device in this embodiment is as follows:

[0040] When the vehicle presses the first bearing 12 on one side of the connecting piece 13, the first bearing 12 on that side is pressed downward, causing the fiber grating strain gauge 21 on that side to deform and output an optical signal. The demodulator analyzes the optical signal to obtain the pressure borne by the first bearing 12 on that side, i.e., the mass of the vehicle.

[0041] As the vehicle moves, the vehicle presses the first bearing 12 on the other side of the connecting piece 13, and similarly outputs the mass of the vehicle. The moving direction of the vehicle is obtained through the sequence of the optical signals output by the fiber grating strain gauges 21.

Claims

1. A pressure detection device based on fiber grating technology, comprising a fiber grating strain gauge; characterized in that, The pressure detection device further comprises: a first carrier and a second carrier, the first carrier being arranged on the upper side of the second carrier and being suspended; a connecting member connecting the first carrier and the second carrier; the fiber grating strain gauges are arranged on both sides of the connecting member, the upper end of the fiber grating strain gauges contacting the suspended first carrier, and the lower end of the fiber grating strain gauges contacting the second carrier.

2. The pressure detection apparatus based on fiber grating technology according to claim 1, characterized by, The end of the first carrier away from the connecting member has a downwardly extending first closing part, the end of the second carrier away from the connecting member has an upwardly extending second closing part, and the second closing part and the first closing part have a gap therebetween.

3. The pressure detection apparatus based on fiber grating technology according to claim 2, characterized by, A rubber strip is arranged in the gap.

4. The pressure detection apparatus based on fiber grating technology according to claim 1, wherein, The bottom end of the first carrier has a downwardly extending first protrusion, and the upper end of the second carrier has an upwardly extending second protrusion, the fiber grating strain gauges being arranged between the first protrusion and the second protrusion.

5. The pressure detection apparatus based on fiber grating technology according to claim 4, characterized by, The first protrusion and the second protrusion are strip-shaped protrusions.

6. The pressure detection apparatus based on fiber grating technology according to claim 1, wherein The bottom end of the second carrier is provided with a positioning slot.

7. The pressure detection apparatus based on fiber grating technology according to claim 6, characterized by, The positioning slot is a dovetail slot.

8. The pressure detection apparatus based on fiber grating technology according to claim 1, wherein, The fiber grating strain gauges are symmetrically arranged about the connecting member, and the first carrier is symmetrically arranged about the connecting member.

9. The pressure detection apparatus based on fiber grating technology according to claim 1, wherein, The first carrier, the connecting member and the second carrier are respectively in the form of a flat plate, and the fiber grating strain gauges are in the form of a column.

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