CN115371582A - Optical fiber F-P strain gauge and assembling method thereof - Google Patents
Optical fiber F-P strain gauge and assembling method thereof Download PDFInfo
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- CN115371582A CN115371582A CN202211314448.1A CN202211314448A CN115371582A CN 115371582 A CN115371582 A CN 115371582A CN 202211314448 A CN202211314448 A CN 202211314448A CN 115371582 A CN115371582 A CN 115371582A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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Abstract
The invention provides an optical fiber F-P strain gauge and an assembly method thereof, wherein the method comprises the following steps: the strain structure comprises a first base body, a second base body and elastic beams, wherein the first base body and the second base body are arranged at intervals along an axis, the second base body is provided with a protruding part extending towards the first base body along the axis, the two elastic beams are connected with the first base body from the side surfaces of the protruding part, and a through containing area is formed in the two elastic beams; the first ferrule assembly extends along the axis and penetrates through the first base body; the second ferrule assembly extends along the axis and penetrates through the second base body; the first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly, the second optical fiber extends along the axis and penetrates through the second ferrule assembly, and a gap is formed between one ends of the first optical fiber and the second optical fiber, which are positioned in the second ferrule assembly; the invention improves the measurement precision and the service life of the optical fiber F-P strain gauge.
Description
Technical Field
The invention relates to the technical field of high-precision optical fiber sensing measurement, in particular to an optical fiber F-P strain gauge and an assembling method thereof.
Background
With the progress of optical fiber technology, the optical fiber strain gauge is applied more and more deeply in the engineering field, however, the requirement of modern structural health monitoring is continuously increased, and the existing research application also faces a lot of difficulties. In the structural health monitoring of large-scale infrastructure such as a fan, a port machine, a ship body and the like, an optical fiber strain gauge is usually welded or embedded in a structure for detection during construction, and has the characteristics of high temperature, high humidity, strong corrosion and the like, and meanwhile, the optical fiber strain gauge is also corroded by rainwater and frozen soil during service, namely, the sensor needs to have complex environment adaptability. According to a large amount of data in an engineering field, the failure rate of the optical fiber strain gauge is very high along with the increase of time, and most of the optical fiber strain gauges are buried in a structure and are difficult to replace, so that the long-term reliability of the optical fiber strain gauges is a great problem which restricts the realization of the full-life monitoring of the optical fiber strain gauges. At present, the optical fiber strain gauge is difficult to meet the characteristics of long-term reliability, high spectral resolution, large spectral range, low cost and high precision, and if the optical fiber grating strain gauge needs to prestretch an optical fiber, the risk of breaking the optical fiber exists, so that the reliability of the optical fiber strain gauge is reduced.
Disclosure of Invention
The invention aims to provide an optical fiber F-P strain gauge and an assembling method thereof, so as to improve the measurement measure and the service life of the optical fiber F-P strain gauge.
In order to achieve the above object, the present invention provides an optical fiber F-P strain gauge, comprising:
the strain structure comprises a first base body, a second base body and two elastic beams, wherein the first base body and the second base body are arranged at intervals along an axis, the second base body is provided with a protruding part extending towards the first base body along the axis, the two elastic beams are connected with the first base body from the side surface of the protruding part, and a through containing area is formed in the two elastic beams;
the first ferrule assembly extends along the axis and penetrates through the first base body, and one end, far away from the second base body, of the first ferrule assembly extends out of the first base body;
the second ferrule assembly extends along the axis and penetrates through the second base body, one end, far away from the first base body, of the second ferrule assembly extends out of the second base body, and the second ferrule assembly further penetrates through the bulge;
the first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the direction of the second base body, the second optical fiber extends along the axis and sequentially penetrates through the second ferrule assembly from the second base body to the direction of the first base body, a gap is formed between one ends, located in the second ferrule assembly, of the first optical fiber and one end, located in the second ferrule assembly, of the second optical fiber, and the gap serves as a resonant cavity of the optical fiber F-P strain gauge.
Optionally, the method includes: the first ferrule assembly comprises a first ceramic ferrule and a first tail handle, the first ceramic ferrule penetrates through the first base body and extends out of the first base body, the first tail handle is connected with the part of the first ceramic ferrule extending out of the first base body, and the first tail handle is fixed on the first base body; the second ferrule assembly comprises a second ceramic ferrule and a second tail handle, the second ceramic ferrule penetrates through the second base body and extends out of the second base body, the second tail handle is connected with the portion, extending out of the second base body, of the second ceramic ferrule, and the second tail handle is fixed on the second base body.
Optionally, the first base has a first through hole facing the protrusion along the axis, the second base has a second through hole facing the first base along the axis and penetrating through the protrusion, and the first ferrule penetrates through the first through hole to be inserted in the first base, and the second ferrule penetrates through the second through hole to be inserted in the second base.
Optionally, the first tail handle has a first through hole facing the first base along the axis, the second tail handle has a second through hole facing the second base along the axis, the first ferrule has a third through hole facing the protrusion along the axis, the second ferrule has a fourth through hole facing the first base along the axis, and the first optical fiber sequentially passes through the first through hole, the third through hole and extends into the fourth through hole, the second optical fiber extends through the second through hole and extends into the fourth through hole, and the gap is provided between the ends of the first optical fiber and the second optical fiber located in the fourth through hole.
Optionally, the first through-holes, the second through-holes, the third through-holes, and the fourth through-holes have the same pore size, and the pore size of the first through-holes, the second through-holes, the third through-holes, and the fourth through-holes is 100 micrometers to 300 micrometers.
Optionally, the length of the second ferrule is 1 to 3 times that of the first ferrule.
Optionally, a plurality of first fixing through holes are formed in the first base body, a plurality of second fixing through holes are formed in the second base body, and the optical fiber F-P strain gauge is fixed on the surface of the measured object through the first fixing through holes and the second fixing through holes.
Optionally, the two elastic beams are symmetrically distributed on two sides of the protruding portion, and a penetrating direction of the accommodating area is the same as a penetrating direction of the first fixing through hole and the second fixing through hole.
Optionally, the elastic beam is C-shaped or S-shaped.
Optionally, the surfaces of the first optical fiber and the second optical fiber are plated with reflective films, and the reflectivity of the reflective films is higher than 90%.
The invention also provides an assembly method of the optical fiber F-P strain gauge, which is used for assembling the optical fiber F-P strain gauge, and the assembly method comprises the following steps:
extending the first ferrule assembly along an axis and penetrating the first ferrule assembly into the first base, and extending the second ferrule assembly along the axis and penetrating the second ferrule assembly into the second base;
a first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the direction of the second base body, and the first optical fiber is fixed on the first ferrule assembly; and the number of the first and second groups,
and a second optical fiber extends along the axis and penetrates through the second ferrule assembly from the second base body to the direction of the first base body, a gap is formed between one ends of the first optical fiber and the second optical fiber, which are positioned in the second ferrule assembly, the gap is used as a resonant cavity of the optical fiber F-P strain gauge, and the second optical fiber is fixed on the second ferrule assembly after the cavity length of the resonant cavity is adjusted.
In the optical fiber F-P strain gauge and the assembling method thereof provided by the invention, the strain structural part comprises a first base body, a second base body and two elastic beams, wherein the first base body and the second base body are arranged at intervals along an axis, the second base body is provided with a protruding part which extends towards the first base body along the axis, the two elastic beams are connected with the first base body from the side surfaces of the protruding part, a through containing area is formed in the two elastic beams, and the elastic beams can prevent the optical fiber F-P strain gauge from deforming in other directions except the direction along the axis when in use; the first ferrule assembly extends along the axis and penetrates through the first base body, and one end, far away from the second base body, of the first ferrule assembly extends out of the first base body; the second ferrule assembly extends along the axis and penetrates through the second base body, one end, far away from the first base body, of the second ferrule assembly extends out of the second base body, and the second ferrule assembly is further arranged in the protruding portion in a penetrating mode, so that the optical collimation performance can be guaranteed, and the measurement accuracy is improved; the first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the second base body, the second optical fiber extends along the axis and sequentially penetrates through the second ferrule assembly from the second base body to the first base body, a gap is formed between one ends, located in the second ferrule assembly, of the first optical fiber and one end, located in the second ferrule assembly, of the second optical fiber, and the gap is used as a resonant cavity of the optical fiber F-P strain gauge.
Drawings
Fig. 1 is a schematic structural diagram of an optical fiber F-P strain gauge according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of an optical fiber F-P strain gauge according to an embodiment of the present invention.
Fig. 3 is a flowchart of an assembly method of an optical fiber F-P strain gauge according to an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of an optical fiber F-P strain gauge according to a second embodiment of the present invention.
Wherein the reference numerals are:
10-a first substrate; 20-a second substrate; 30. 300-a flexible beam; 12-a first fixing through hole; 21-a projection; 22-a second fixing through hole; 31. 310-a housing area; 41-first tail handle; 42-second caudal peduncle; 51-a first ferrule; 52-a second ferrule; 61-a first optical fiber; 62-a second optical fiber; 70-resonant cavity.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
Fig. 1 is a schematic structural diagram of an optical fiber F-P strain gauge provided in this embodiment; fig. 2 is a schematic cross-sectional view of an optical fiber F-P strain gauge provided in this embodiment, wherein fig. 2 is a schematic cross-sectional view along a direction B1B2 in fig. 1. The invention provides an optical fiber F-P strain gauge, which comprises: the optical fiber connector comprises a strain structural member, a first ferrule assembly, a second ferrule assembly, a first optical fiber and a second optical fiber. Referring to fig. 1 and 2, the strain structure includes a first substrate 10, a second substrate 20 and two elastic beams 30, the first substrate 10 and the second substrate 20 are disposed at an interval along an axis A1A2, the second substrate 20 has a protrusion 21 extending toward the first substrate 10 along the axis A1A2, the first substrate 10 has an extension (not shown) extending toward the second substrate 20 along the axis A1A2, the two elastic beams 30 are connected to the extension of the first substrate 10 from a side surface of the protrusion 21 to achieve connection between the first substrate 10 and the second substrate 20, the two elastic beams 30 are symmetrically distributed on two sides of the protrusion 21, a through receiving area 31 is formed in the two elastic beams 30, a part of the protrusion 21 is located in the receiving area 31, and a gap is formed between the protrusion 21 and the first substrate 10. In thatIn this embodiment, the strain structure is preferably made of an alloy with a low expansion temperature coefficient to reduce the change of the strain structure caused by thermal expansion and contraction, for example, a kovar alloy with a low expansion coefficient is selected, and the thermal expansion coefficient is less than 3 × 10 -6 and/K. In this embodiment, the beam 30 is preferably C-shaped to reduce the longitudinal and axial stiffness of the beam 30 and to avoid deformation of the beam 30 in directions other than along the axis A1A2 when the fiber F-P strain gauge is in use.
Furthermore, a plurality of first fixing through holes 12 are formed in the first substrate 10, a plurality of second fixing through holes 22 are formed in the second substrate 20, and the optical fiber F-P strain gauge is fixed on the surface of the object to be measured through the first fixing through holes 12 and the second fixing through holes 22, wherein the number of the first fixing through holes 12 and the number of the second fixing through holes 22 may be 2, 3, or the like, and the number of the first fixing through holes 12 and the number of the second fixing through holes 22 are illustrated as 2 in the drawing. In the present embodiment, the penetrating direction of the receiving area 31 is the same as the penetrating direction of the first and second fixing through holes 12 and 22. The distance between the first fixing through hole 12 and the second fixing through hole 22 is defined as a measurement gauge length of the optical fiber F-P strain gauge, the distance between the first fixing through hole 12 and the second fixing through hole 22 is a distance between the first fixing through hole 12 and the second fixing through hole 22 adjacent to each other in the left-right direction in fig. 2, and in the design process, in order to ensure that the optical fiber F-P strain gauge has a large strain measurement range, the distance between the first fixing through hole 12 and the second fixing through hole 22 needs to be shortened to increase the strain measurement range of the optical fiber F-P strain gauge.
Further, the first base 10 has a first through hole facing the protrusion 21 along the axis A1A2 and penetrating the extension, and the second base 20 has a second through hole facing the first base 10 along the axis A1A2 and penetrating the protrusion 21, the first through hole and the second through hole not being labeled in the figure.
The first ferrule assembly extends along the axis A1A2 and is inserted into the first base 10, and one end of the first ferrule assembly, which is far away from the second base 20, extends out of the first base 10. Specifically, the first ferrule assembly includes a first ferrule 51 and a first tail handle 41, the first ferrule 51 penetrates through the first through hole to be disposed in the first base 10, and a portion of the first ferrule 51 extends out of the first base 10, the first tail handle 41 is connected to a portion of the first ferrule 51 extending out of the first base 10, and the first tail handle 41 is fixed on the first base 10. In the present embodiment, the first tail handle 41 and the first ferrule 51 may be formed integrally by crimping, and the portion of the first ferrule 51 protruding out of the first base 10 is located inside the first tail handle 41.
The second ferrule assembly extends along the axis A1A2 and is inserted into the second base 20, and one end of the second ferrule assembly, which is far away from the first base 10, extends out of the second base 20, and is also inserted into the protrusion 21. Specifically, the second ferrule assembly includes a second ferrule 52 and a second tail handle 42, the second ferrule 52 penetrates through the second through hole to be disposed in the second base 20, and a portion of the second ferrule 52 extends out of the second base 20, the second tail handle 42 is connected to a portion of the second ferrule 52 extending out of the second base 20, and the second tail handle 42 is fixed to the second base 20. In this embodiment, the second tail shank 42 and the second ferrule 52 may be integrally formed by crimping, with the portion of the second ferrule 52 extending beyond the second base 20 being located within the second tail shank 42. In the present embodiment, the length of the second ferrule 52 is 1 to 3 times the length of the first ferrule 51, but is not limited to this length requirement.
Further, the first tail stem 41 has a first through hole facing the first base 10 along the axis A1A2, the second tail stem 42 has a second through hole facing the second base 20 along the axis A1A2, the first ferrule 51 has a third through hole facing the boss 21 along the axis A1A2, the second ferrule 52 has a fourth through hole facing the first base 10 along the axis A1A2 and penetrating the boss 21, and the first through hole, the second through hole, the third through hole, and the fourth through hole are not indicated in the drawing. In this embodiment, the apertures of the first through hole, the second through hole, the third through hole and the fourth through hole are the same, and the apertures of the first through hole, the second through hole, the third through hole and the fourth through hole are preferably 100 micrometers to 300 micrometers, so that the first optical fiber and the second optical fiber can pass through without excessive deviation, and the measurement accuracy can be improved.
The first optical fiber 61 extends along the axis A1A2 and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body 10 to the direction of the second base body 20, the second optical fiber 62 extends along the axis A1A2 and penetrates through the second ferrule assembly from the second base body 20 to the direction of the first base body 10, a gap is formed between one ends of the first optical fiber 61 and the second optical fiber 62 in the second ferrule assembly, and the gap is used as a resonant cavity 70 of the optical fiber F-P strain gauge. Specifically, the first optical fiber 61 sequentially passes through the first through hole and the third through hole to extend into the fourth through hole, the second optical fiber 62 passes through the second through hole to extend into the fourth through hole, and a gap is formed between ends of the first optical fiber 61 and the second optical fiber 62, which are located in the fourth through hole. In this embodiment, the surfaces of the first optical fiber 61 and the second optical fiber 62 are coated with a reflective film, and the reflectivity of the reflective film is preferably higher than 90%.
Further, a first fixing point, by which the first optical fiber 61 is fixed, is provided on an end surface of the first ferrule 51 near the boss 21; a second fastening point is provided on the end face of the second shank 42 remote from the second base body 20, by means of which the second optical fiber 62 is fastened. In the present embodiment, the length of the first optical fiber 61 in the second ferrule 52 is 0.3 to 0.7 times the length of the second ferrule 52, but is not limited to this length.
In this embodiment, the fiber F-P strain gauge is a strain and stress measuring element based on Fabry-Perot interference principle and used under a wide spectrum light source. The optical fiber F-P strain gauge realizes the measurement of the strain of the elastic body of the strain gauge and the measurement of the stress of the elastic body of the strain gauge according to the corresponding relation between the spectral light intensity distribution of output light and the length of an interference cavity of the strain gauge. The optical fiber F-P strain gauge adopts the end faces of the two optical fibers to form the interference cavity, so that the optical fibers do not need to be pre-stretched, and the optical fibers only need to be fixed in a structural member. The device can bear long-term alternating load, has strong anti-fatigue capability, and can not cause the measurement precision to be reduced or fail in the long-term use process. Compared with a fiber grating strain gauge, the fiber grating strain gauge has the advantages of high sensitivity, large measurement range, high measurement precision, high repeatability, high reliability and the like.
Fig. 3 is a flowchart of an assembly method of an optical fiber F-P strain gauge according to this embodiment. Referring to fig. 3, the present invention further provides an assembling method of an optical fiber F-P strain gauge, for assembling the optical fiber F-P strain gauge, the assembling method includes:
step S1: extending the first ferrule assembly along the axis and penetrating the first ferrule assembly into the first base body, and extending the second ferrule assembly along the axis and penetrating the second ferrule assembly into the second base body;
step S2: the first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the second base body, and is fixed on the first ferrule assembly;
and step S3: and the second optical fiber extends along the axis and penetrates through the second ferrule assembly from the second base body to the direction of the first base body, a gap is formed between one ends of the first optical fiber and the second optical fiber, which are positioned in the second ferrule assembly, the gap is used as a resonant cavity of the optical fiber F-P strain gauge, and the second optical fiber is fixed on the second ferrule assembly after the cavity length of the resonant cavity is adjusted.
The method for assembling the optical fiber F-P strain gauge according to this embodiment will be described in detail below.
With continuing reference to fig. 1 and 2, step S1 is performed: the first base 10 has a first through hole through the extension toward the boss 21 along the axis A1A2, the second base 20 has a second through hole through the boss 21 toward the first base 10 along the axis A1A2, the first ferrule assembly includes a first ferrule 51 and a first tail stem 41, and the second ferrule assembly includes a second ferrule 52 and a second tail stem 42. The first stem 41 and the first ferrule 51 are connected by crimping, and the second stem 42 and the second ferrule 52 are connected by crimping. Further, the first ferrule 51 is inserted into the first through hole of the first base 10 along the axis A1A2, and the end face of the first stem 41 is weld-fixed to the first base 10, and the second ferrule 52 is inserted into the second through hole of the second base 20 along the axis A1A2, and the end face of the second stem 42 is weld-fixed to the second base 20.
With continuing reference to fig. 1 and 2, step S2 is performed: the first tail stem 41 has a first through hole facing the first base 10 along the axis A1A2, the second tail stem 42 has a second through hole facing the second base 20 along the axis A1A2, the first ferrule 51 has a third through hole facing the protrusion 21 along the axis A1A2, the second ferrule 52 has a fourth through hole facing the first base 10 along the axis A1A2 and penetrating the protrusion 21, a first fixing point is provided on an end face of the first ferrule 51 near the protrusion 21, and a second fixing point is provided on an end face of the second tail stem 42 away from the second base 20. The first optical fiber 61 passes through the first through hole and the third through hole in sequence along the axis A1A2 and from the first substrate 10 to the second substrate 20, and then passes through the fourth through hole, and the length of the fourth through hole is preferably half of the length of the fourth through hole; further, the first optical fiber 61 is fixed to the first ferrule assembly by the first fixing point.
With continuing reference to fig. 1 and 2, step S3 is performed: a second optical fiber 62 passes through the second through hole along the axis A1A2 and from the second matrix 20 to the first matrix 10, and then passes through the fourth through hole, and a gap is formed between the first optical fiber 61 and one end of the second optical fiber 62 in the fourth through hole, and the gap is used as a resonant cavity 70 of the optical fiber F-P strain gauge; and then the cavity length (cavity length) of the resonant cavity 70 is adjusted, and the second optical fiber 62 is fixed to the second ferrule assembly by the second fixing point.
Example two
Fig. 4 is a schematic cross-sectional view of an optical fiber F-P strain gauge provided in this embodiment. Referring to fig. 4, the difference between the present embodiment and the first embodiment is: the two elastic beams 300 have different structural shapes, the elastic beam 300 of the embodiment is S-shaped, a through accommodation area 310 is formed in the two elastic beams 300, and other structures are the same as those of the embodiment (corresponding to the same reference numerals), and are not described herein again.
In summary, in the optical fiber F-P strain gauge and the assembling method thereof provided by the present invention, the strain structure includes a first substrate, a second substrate and two elastic beams, the first substrate and the second substrate are disposed at intervals along an axis, the second substrate has a protrusion extending toward the first substrate along the axis, the two elastic beams are connected to the first substrate from the side of the protrusion, and a through receiving area is formed in the two elastic beams, the elastic beams can prevent the optical fiber F-P strain gauge from deforming in other directions except the axial direction when in use; the first ferrule assembly extends along the axis and penetrates through the first base body, and one end, far away from the second base body, of the first ferrule assembly extends out of the first base body; the second ferrule assembly extends along the axis and penetrates through the second base body, one end, far away from the first base body, of the second ferrule assembly extends out of the second base body, and the second ferrule assembly is further arranged in the protruding portion in a penetrating mode, so that the optical collimation performance can be guaranteed, and the measurement accuracy is improved; the first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the second base body, the second optical fiber extends along the axis and sequentially penetrates through the second ferrule assembly from the second base body to the first base body, a gap is formed between one ends, located in the second ferrule assembly, of the first optical fiber and one end, located in the second ferrule assembly, of the second optical fiber, and the gap is used as a resonant cavity of the optical fiber F-P strain gauge.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. An optical fiber F-P strain gauge, comprising:
the strain structure comprises a first base body, a second base body and two elastic beams, wherein the first base body and the second base body are arranged at intervals along an axis, the second base body is provided with a protruding part extending towards the first base body along the axis, the two elastic beams are connected with the first base body from the side surface of the protruding part, and a through containing area is formed in the two elastic beams;
the first ferrule assembly extends along the axis and penetrates through the first base body, and one end, far away from the second base body, of the first ferrule assembly extends out of the first base body;
the second ferrule assembly extends along the axis and penetrates through the second base, one end, far away from the first base, of the second ferrule assembly extends out of the second base, and the second ferrule assembly is further penetrated in the protruding part;
the first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the direction of the second base body, the second optical fiber extends along the axis and sequentially penetrates through the second ferrule assembly from the second base body to the direction of the first base body, a gap is formed between one ends, located in the second ferrule assembly, of the first optical fiber and one end, located in the second ferrule assembly, of the second optical fiber, and the gap serves as a resonant cavity of the optical fiber F-P strain gauge.
2. The fiber optic F-P strain gauge of claim 1, comprising: the first ferrule assembly comprises a first ferrule and a first tail handle, the first ferrule penetrates through the first base body and extends out of the first base body, the first tail handle is connected with the part of the first ferrule extending out of the first base body, and the first tail handle is fixed on the first base body; the second ferrule assembly comprises a second ceramic ferrule and a second tail handle, the second ceramic ferrule penetrates through the second base body and extends out of the second base body, the second tail handle is connected with the portion, extending out of the second base body, of the second ceramic ferrule, and the second tail handle is fixed on the second base body.
3. The fiber F-P strain gauge of claim 2, wherein the first base has a first through hole facing the protrusion along the axis, the second base has a second through hole facing the first base along the axis and penetrating the protrusion, and the first ferrule penetrates the first through hole to be disposed in the first base, and the second ferrule penetrates the second through hole to be disposed in the second base.
4. The fiber optic F-P strain gauge of claims 2 or 3, wherein the first tang has a first bore along the axis toward the first substrate, the second tang has a second bore along the axis toward the second substrate, the first ferrule has a third bore along the axis toward the protrusion, the second ferrule has a fourth bore along the axis toward the first substrate, and the first optical fiber extends through the first bore, the third bore, and into the fourth bore in sequence, the second optical fiber extends through the second bore, the first and second optical fibers having the void between their ends within the fourth bore.
5. The fiber optic F-P strain gauge of claim 4 wherein the first, second, third and fourth perforations have the same pore size, the first, second, third and fourth perforations having a pore size of 100-300 microns.
6. The fiber F-P strain gauge of claim 4, wherein the length of the second ferrule is 1 to 3 times the length of the first ferrule.
7. The fiber optic F-P strain gauge of claim 1 wherein the first substrate has a plurality of first securing through holes and the second substrate has a plurality of second securing through holes, the fiber optic F-P strain gauge being secured to the surface of the object through the first securing through holes and the second securing through holes.
8. The optical fiber F-P strain gauge according to claim 7, wherein two elastic beams are symmetrically distributed on two sides of the protrusion portion, and a penetrating direction of the accommodating area is the same as a penetrating direction of the first fixing through hole and the second fixing through hole.
9. The fiber optic F-P strain gauge of claim 8, wherein the spring beam is C-shaped or S-shaped.
10. The fiber F-P strain gauge of claim 1, wherein the first and second optical fibers are coated with a reflective film having a reflectivity of greater than 90%.
11. An assembling method of an optical fiber F-P strain gauge, which is used for assembling the optical fiber F-P strain gauge as claimed in any one of claims 1 to 10, and comprises the following steps:
extending the first ferrule assembly along an axis and penetrating the first ferrule assembly into the first base, and extending the second ferrule assembly along the axis and penetrating the second ferrule assembly into the second base;
a first optical fiber extends along the axis and sequentially penetrates through the first ferrule assembly and the second ferrule assembly from the first base body to the direction of the second base body, and the first optical fiber is fixed on the first ferrule assembly; and the number of the first and second groups,
and a second optical fiber extends along the axis and penetrates through the second ferrule assembly from the second base body to the direction of the first base body, a gap is formed between one ends of the first optical fiber and the second optical fiber, which are positioned in the second ferrule assembly, the gap is used as a resonant cavity of the optical fiber F-P strain gauge, and the second optical fiber is fixed on the second ferrule assembly after the cavity length of the resonant cavity is adjusted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211314448.1A CN115371582B (en) | 2022-10-26 | 2022-10-26 | Optical fiber F-P strain gauge and assembling method thereof |
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| CN202211314448.1A CN115371582B (en) | 2022-10-26 | 2022-10-26 | Optical fiber F-P strain gauge and assembling method thereof |
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| CN115371582A true CN115371582A (en) | 2022-11-22 |
| CN115371582B CN115371582B (en) | 2023-03-24 |
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| CN202211314448.1A Active CN115371582B (en) | 2022-10-26 | 2022-10-26 | Optical fiber F-P strain gauge and assembling method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117928695A (en) * | 2024-03-22 | 2024-04-26 | 上海拜安传感技术有限公司 | MEMS optical fiber cantilever type weighing sensor and weighing module |
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