CN112504311A - Reflection type fiber grating system and demodulation calibration device - Google Patents
Reflection type fiber grating system and demodulation calibration device Download PDFInfo
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- CN112504311A CN112504311A CN202011466754.8A CN202011466754A CN112504311A CN 112504311 A CN112504311 A CN 112504311A CN 202011466754 A CN202011466754 A CN 202011466754A CN 112504311 A CN112504311 A CN 112504311A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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Abstract
The invention relates to a reflection-type fiber grating system and a demodulation and calibration device, wherein the demodulation and calibration device comprises an elastic reset piece and an adjusting piece, and the adjusting piece can move back and forth towards the direction close to or far away from the elastic reset piece; when the adjusting piece moves to be in interference fit with the elastic resetting piece, the elastic resetting piece can generate strain; when the adjusting piece moves to and the elasticity resets the piece interval and sets up, elasticity resets the piece and can reset. The strain of the elastic reset piece can be changed only by moving the adjusting piece towards the direction close to or far away from the elastic reset piece, so that the structure is compact, and the operation is simple and convenient; meanwhile, demodulation calibration can be completed without a temperature control device, and the cost is low. Moreover, the temperature of the temperature control device does not need to be raised slowly, and the demodulation calibration efficiency is high.
Description
Technical Field
The invention relates to the technical field of fiber grating sensing, in particular to a reflection-type fiber grating system and a demodulation calibration device.
Background
The fiber grating is used as a passive filter device and is widely applied to multiple fields of civil and architectural engineering, electric power engineering, oil and gas engineering, transportation, aerospace and the like. The sensing information of the fiber grating is obtained by modulating the wavelength of the fiber grating by external physical quantity, so that the demodulation of the sensing signal of the fiber grating plays an important role in the application of the fiber grating sensing technology. The demodulation modes of the sensing signal of the fiber grating mainly include wavelength demodulation, phase demodulation, intensity demodulation, polarization demodulation and the like. The wavelength demodulation technology has the characteristics of easy realization, stable operation of optical equipment and strong anti-interference capability, and is widely applied to demodulation of sensing signals of the fiber bragg grating.
The reflective fiber grating is an optical device formed by periodically modulating the refractive index of a fiber core in an optical fiber. When light passes through the reflection-type fiber grating, a forward-propagating core mode is coupled with a backward-propagating core mode, thereby forming reflection of an incident wave. The wavelength of the reflected wave is determined by the period and effective refractive index of the reflective fiber grating, and these two parameters are affected by the strain of the reflective fiber grating, so that the reflective fiber grating needs to be demodulated and calibrated during use. The traditional demodulation calibration mode is to use a temperature control device to control temperature change so as to change the dependent variable of an etalon, and the cost is high.
Disclosure of Invention
In view of the above, it is necessary to provide a reflective fiber grating system and a demodulation calibration device for solving the problem of high cost.
The technical scheme is as follows:
in one aspect, the demodulation calibration device comprises an elastic resetting piece and an adjusting piece, wherein the adjusting piece can move back and forth towards a direction close to or far away from the elastic resetting piece; when the adjusting piece moves to be in interference fit with the elastic resetting piece, the elastic resetting piece can generate strain; when the adjusting piece moves to and the elasticity resets the piece interval and sets up, elasticity resets the piece and can reset.
When the demodulation calibration device of the embodiment is used, the reflection-type fiber bragg grating is firstly fixedly arranged on the elastic reset piece, so that the reflection-type fiber bragg grating can generate strain along with the strain of the elastic reset piece. Move near elasticity when the regulating part orientation resets a direction and remove, until the regulating part remove to restore to the throne the piece conflict cooperation with elasticity and apply the interference force to elasticity and restore to the throne the piece, elasticity resets under the effect of interference and takes place to meet an emergency to make reflection-type fiber grating take place corresponding meeting an emergency, and then make the wavelength of reflection wave take place to squint. Move when the regulating part orientation is kept away from elasticity and is reset a direction to reduce the interference force that resets the piece to elasticity, reset the piece separation and the interval sets up until regulating part and elasticity, at this moment, elasticity resets the piece and does not receive the effect of external force, and elasticity resets and resets under the effect of the power that resets of self, thereby makes reflection-type fiber grating reset, and then makes the wavelength of back wave reply, thereby the completion is to reflection-type fiber grating's demodulation calibration. The strain of the elastic reset piece can be changed only by moving the adjusting piece towards the direction close to or far away from the elastic reset piece, so that the structure is compact, and the operation is simple and convenient; meanwhile, demodulation calibration can be completed without a temperature control device, and the cost is low. Moreover, the temperature of the temperature control device does not need to be raised slowly, and the demodulation calibration efficiency is high.
The technical solution is further explained below:
in one embodiment, the demodulation calibration device further includes an auxiliary reset member, the auxiliary reset member is spaced from the adjusting member, and one end of the auxiliary reset member is capable of being connected to the elastic reset member and is used for resetting the elastic reset member.
In one embodiment, the demodulation calibration device further comprises a housing, the housing is provided with a cavity and a connecting hole communicated with the cavity, the elastic reset piece and the auxiliary reset piece are both arranged in the cavity, and one end of the adjusting piece can penetrate through the connecting hole to be inserted into the cavity.
In one embodiment, the adjusting piece comprises an adjusting screw, and the inner wall of the connecting hole is provided with an internal thread capable of being in threaded fit with the external thread of the adjusting screw.
In one embodiment, the auxiliary return member includes a first return spring; the first return spring is in a compression state, and the elastic return piece is arranged between the first return spring and the adjusting screw rod.
In one embodiment, the central axis of the first return spring coincides with the central axis of the adjusting screw.
In one embodiment, the adjusting part further comprises an adjusting knob sleeved on the outer wall of the adjusting screw rod and in threaded fit with the adjusting screw rod, and the outer wall of the adjusting knob is provided with scales for indicating the displacement of the adjusting screw rod.
In one embodiment, one end of the elastic resetting piece is connected with the inner wall of the cavity, the other end of the elastic resetting piece is arranged in a suspended mode, and the adjusting piece and the auxiliary resetting piece are both arranged close to the other end of the elastic resetting piece.
In another aspect, a reflective fiber grating system is provided, which includes a reflective fiber grating disposed on the elastic reset member and the demodulation calibration device.
In one embodiment, the reflective fiber grating system further comprises an adhesive layer for adhering the reflective fiber grating to the elastic reset member.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a demodulation calibration apparatus according to an embodiment.
Description of reference numerals:
100. demodulation calibration device 110, elastic reset piece 120, adjusting piece 121, adjusting screw 122, adjusting knob 130, auxiliary reset piece 131, first reset spring 140, shell 141, cavity 142, connecting hole 200 and reflection type fiber grating.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1, in one embodiment, a detuning calibration device 100 is provided, which includes an elastic reset element 110 and an adjusting element 120. The adjusting member 120 can move back and forth toward or away from the elastic restoring member 110 (as shown in the direction a of fig. 1); when the adjusting member 120 moves to be in interference fit with the elastic resetting member 110, the elastic resetting member 110 can be strained; when the adjusting member 120 moves to be spaced apart from the elastic restoring member 110, the elastic restoring member 110 can be restored.
When the demodulation calibration device 100 of the above embodiment is used, the reflective fiber grating 200 is first fixed on the elastic resetting member 110, so that the reflective fiber grating 200 can generate strain along with the strain of the elastic resetting member 110. When the adjusting member 120 moves toward the direction close to the elastic resetting member 110, until the adjusting member 120 moves to be in interference fit with the elastic resetting member 110 to apply an interference force to the elastic resetting member 110, the elastic resetting member 110 is strained under the effect of the interference force, so that the reflective fiber grating 200 is strained correspondingly, and the wavelength of the reflected wave is shifted. When the adjusting member 120 moves towards the direction away from the elastic resetting member 110, the contact force to the elastic resetting member 110 is reduced, until the adjusting member 120 is separated from the elastic resetting member 110 and is arranged at an interval, at this time, the elastic resetting member 110 is free from the action of external force, and the elastic resetting member 110 resets under the action of self resetting force, so that the reflection-type fiber grating 200 resets, the wavelength of the reflected wave returns, and the demodulation and calibration of the reflection-type fiber grating 200 are completed.
Compared with the conventional demodulation calibration device 100 which controls the temperature change by using a temperature control device to change the strain amount of the etalon, the demodulation calibration device 100 of the embodiment can change the strain amount of the elastic reset piece 110 only by moving the adjusting piece 120 towards the direction close to or away from the elastic reset piece 110, and has the advantages of compact structure, portability, and simple and convenient operation; meanwhile, demodulation calibration can be completed without a temperature control device, and the cost is low. Moreover, the temperature of the temperature control device does not need to be raised slowly, and the demodulation calibration efficiency is high.
It should be noted that the demodulation calibration apparatus 100 of the above embodiment may also be used in combination with other optical fiber devices, and since it belongs to an existing device and does not belong to the improvement point of the present application, it is not described herein again, and only needs to be satisfied that the demodulation calibration of the reflective fiber grating 200 can be completed. The demodulation calibration apparatus 100 of the above embodiment is particularly suitable for metrology calibration with respect to wavelength accuracy.
The reflective fiber grating 200 may be a fabry-perot fiber grating, a chirped grating, or a bragg fiber grating.
The reflective fiber grating 200 is fixed on the elastic reset member 110, and the reflective fiber grating 200 can be fixed on the elastic reset member 110 by adhesion using an adhesive layer (not shown), so that the connection is reliable, and the reflective fiber grating 200 can generate corresponding strain along with the strain of the elastic reset member 110. The adhesive layer is preferably polymer gel, so that the adhesive layer is reliable in adhesion, can protect the reflective fiber grating 200 and can play a role in sensitization.
The elastic restoring member 110 may be an elastic beam or an elastic sheet, and the like, and only needs to be capable of generating strain under the action of external force and restoring when the external force is removed.
As shown in fig. 1, the demodulation calibration apparatus 100 further includes an auxiliary reset device 130. The auxiliary reset member 130 is spaced apart from the adjusting member 120, and one end of the auxiliary reset member 130 can be connected to the elastic reset member 110 and used for resetting the elastic reset member 110. Therefore, the auxiliary reset piece 130 can assist the elastic reset piece 110 to reset, so that the elastic reset piece 110 is prevented from generating elastic fatigue and being incapable of resetting accurately, the service life of the elastic reset piece 110 can be prolonged, and the demodulation and calibration precision can be ensured. Wherein, supplementary piece 130 that resets and elasticity reset being connected of piece 110, can be the mode that takes place to contradict when the contact and connect, also can carry out assembly connection through modes such as riveting, spiro union, only need satisfy can supplementary elasticity reset piece 110 reset can.
As shown in fig. 1, the demodulation calibration apparatus 100 further includes a housing 140, and the housing 140 is provided with a cavity 141 and a connection hole 142 communicating with the cavity 141. The elastic reset element 110 and the auxiliary reset element 130 are disposed in the cavity 141. Thus, the shell 140 can protect the elastic reset element 110 and the auxiliary reset element 130, and the elastic reset element 110 and the auxiliary reset element 130 are prevented from being influenced by the outside. One end of the adjusting member 120 can be inserted into the cavity 141 through the connection hole 142. Thus, when one end of the adjusting element 120 extends into the cavity 141, the adjusting element can approach the elastic resetting element 110 until the adjusting element is in interference fit with the elastic resetting element 110 to cause the elastic resetting element 110 to generate strain; when one end of the adjusting member 120 is pulled out of the cavity 141, the adjusting member can be away from the elastic resetting member 110 until the adjusting member is separated from the elastic resetting member 110 and arranged at an interval, and the elastic resetting member 110 resets under the action of self resetting force or resets by combining the self resetting force and the resetting force of the auxiliary resetting member 130.
Wherein, regulating part 120 moves towards being close to or keeping away from elasticity piece 110 direction that resets, can realize through the mode of pegging graft, also can realize through the mode of spiro union, can also realize through sliding fit's mode, only need satisfy and can apply conflict effort when being close to elasticity piece 110 that resets, and can reduce until eliminating conflict effort when keeping away from elasticity piece 110 that resets can.
As shown in fig. 1, in one embodiment, the adjusting member 120 includes an adjusting screw 121, and an inner wall of the connecting hole 142 is provided with an internal thread capable of being threadedly engaged with an external thread of the adjusting screw 121. Thus, when the adjusting screw 121 is screwed in a first direction (e.g., clockwise or counterclockwise), the adjusting screw 121 can be screwed into the cavity 141 until the end of the adjusting screw 121 collides with the elastic resetting member 110 to cause the elastic resetting member 110 to generate strain, and further cause the reflective fiber grating 200 to generate corresponding strain; when the adjusting screw 121 is screwed in the opposite direction of the first direction (e.g., counterclockwise or clockwise), the adjusting screw 121 can be screwed out of the cavity 141 until the end of the adjusting screw 121 is separated from the elastic resetting member 110, and the elastic resetting member 110 is reset by its own resetting force or is reset by combining its own resetting force and the resetting force of the auxiliary resetting member 130, so that the reflective fiber grating 200 is reset. And, the threaded fit of the internal threads of the adjusting screw 121 and the connecting hole 142 is utilized to realize that the adjusting screw 121 is close to or away from the elastic reset piece 110, so that the adjustment of small displacement can be realized, the displacement of one thread pitch can be realized when the adjusting screw 121 rotates for one circle, and the accurate and orderly progress of the strain of the elastic reset piece 110 is ensured.
The arrangement mode between the auxiliary reset member 130 and the adjusting member 120 can be flexibly selected or adjusted according to actual use requirements, and only the requirement that the two members do not interfere with each other is met. The auxiliary restoring member 130 may be a spring, a reed or other conventional element capable of assisting the elastic restoring member 110 to restore.
As shown in fig. 1, in one embodiment, the auxiliary restoring member 130 includes a first restoring spring 131; the first return spring 131 is in a compressed state, and the elastic return element 110 is disposed between the first return spring 131 and the adjusting screw 121. Thus, the adjusting screw 121 is screwed into the cavity 141 to be in interference fit with the elastic resetting member 110, at this time, the elastic resetting member 110 transmits interference force to the first resetting spring 131, so that the first resetting spring 131 is compressed, and along with further screwing of the adjusting screw 121, the elastic resetting member 110 overcomes self resetting force and resetting force of the first resetting spring 131 to generate strain, so that the reflective fiber grating 200 generates corresponding strain; when the adjusting screw 121 is unscrewed from the cavity 141, the elastic reset piece 110 is reset under the combined action of the reset force of the elastic reset piece 110 and the reset force of the first reset spring 131, and until the end of the adjusting screw 121 is separated from the elastic reset piece 110, the reflective fiber grating 200, the elastic reset piece 110 and the first reset spring 131 all return to the initial state.
Further, the center axis of the first return spring 131 coincides with the center axis of the adjustment screw 121. So for adjusting screw 121 to the elasticity reset piece 110 the offset force and first reset spring 131 to the elasticity reset piece 110 reset the power on same straight line, guarantee that elasticity resets 110's both sides atress balanced, guarantee that elasticity resets 110 can not take place to buckle or distort, prolonged life. Of course, in other embodiments, the central axis of the first return spring 131 and the central axis of the adjusting screw 121 may be arranged in a staggered manner, and only the elastic return element 110 is required to be strained under the action of the adjusting screw 121 and can be returned under the combined action of the own return force and the return force of the first return spring 131.
In order to ensure the accuracy of the displacement of the adjusting screw 121, it is also possible to use a corresponding adjusting element in conjunction with the adjusting screw 121. Specifically, the adjusting member 120 further includes an adjusting knob 122 sleeved on an outer wall of the adjusting screw 121 and in threaded fit with the adjusting screw 121, and the outer wall of the adjusting knob 122 is provided with a scale for indicating a displacement of the adjusting screw 121. Therefore, the adjusting screw 121 can be extended into the cavity 141 or pulled out of the cavity 141 by screwing the adjusting knob 122, which is simple and convenient; moreover, the scale on the adjusting knob 122 can be used to simply and conveniently read the displacement of the adjusting screw 121.
As shown in fig. 1, in addition, when the elastic restoring element 110 is disposed in the cavity 141, one end of the elastic restoring element 110 may be connected to an inner wall of the cavity 141 by welding, screwing, riveting, or the like, and the other end of the elastic restoring element 110 is in a suspended state, and in addition, the adjusting element 120 and the auxiliary restoring element 130 may be disposed close to the other end of the elastic restoring element 110. Thus, when the adjusting member 120 applies a contact force to the elastic resetting member 110, the elastic resetting member 110 can be ensured to be strained, so as to drive the reflective fiber grating 200 to be strained correspondingly; when the interference force applied to the elastic reset element 110 by the adjusting element 120 is reduced until the interference force disappears, the elastic reset element 110 can be accurately reset under the action of its own reset force and the auxiliary reset element 130, so as to drive the reflective fiber grating 200 to be accurately reset.
As shown in fig. 1, in an embodiment, there is further provided a reflective fiber grating system, which includes a reflective fiber grating 200 and the demodulation and calibration device 100 of any of the above embodiments, wherein the reflective fiber grating 200 is disposed on the elastic reset member 110.
In the reflective fiber grating system of the above embodiment, the strain amount of the elastic resetting member 110 can be changed only by moving the adjusting member 120 toward a direction close to or away from the elastic resetting member 110, and the reflective fiber grating system has a compact structure and is simple and convenient to operate; meanwhile, demodulation calibration can be completed without a temperature control device, and the cost is low. Moreover, the temperature of the temperature control device does not need to be raised slowly, and the demodulation calibration efficiency is high.
The "certain body" and the "certain portion" may be a part corresponding to the "member", that is, the "certain body" and the "certain portion" may be integrally formed with the other part of the "member"; the "part" can be made separately from the "other part" and then combined with the "other part" into a whole. The expressions "a certain body" and "a certain part" in the present application are only one example, and are not intended to limit the scope of the present application for reading convenience, and the technical solutions equivalent to the present application should be understood as being included in the above features and having the same functions.
It should be noted that, the components included in the "unit", "assembly", "mechanism" and "device" of the present application can also be flexibly combined, i.e., can be produced in a modularized manner according to actual needs, so as to facilitate the modularized assembly. The division of the above-mentioned components in the present application is only one example, which is convenient for reading and is not a limitation to the protection scope of the present application, and the same functions as the above-mentioned components should be understood as equivalent technical solutions in the present application.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as "fixed transmission connection" with another element, the two elements may be fixed in a detachable connection manner or in an undetachable connection manner, and power transmission can be achieved, such as sleeving, clamping, integrally-formed fixing, welding and the like, which can be achieved in the prior art, and is not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should also be understood that in explaining the connection relationship or the positional relationship of the elements, although not explicitly described, the connection relationship and the positional relationship are interpreted to include an error range which should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The demodulation calibration device is characterized by comprising an elastic resetting piece and an adjusting piece, wherein the adjusting piece can move back and forth towards the direction close to or far away from the elastic resetting piece; when the adjusting piece moves to be in interference fit with the elastic resetting piece, the elastic resetting piece can generate strain; when the adjusting piece moves to and the elasticity resets the piece interval and sets up, elasticity resets the piece and can reset.
2. The detuning calibration device according to claim 1, further comprising an auxiliary reset member, the auxiliary reset member being spaced apart from the adjusting member, wherein an end of the auxiliary reset member is connectable to the elastic reset member and is configured to reset the elastic reset member.
3. The demodulation calibration device according to claim 2, further comprising a housing, wherein the housing is provided with a cavity and a connecting hole communicated with the cavity, the elastic reset member and the auxiliary reset member are both disposed in the cavity, and one end of the adjusting member can pass through the connecting hole and be inserted into the cavity.
4. The demodulation calibration device according to claim 3, wherein the adjusting member comprises an adjusting screw, and an inner wall of the connecting hole is provided with an internal thread capable of being in threaded engagement with an external thread of the adjusting screw.
5. The demodulation calibration device according to claim 3, wherein the auxiliary reset member comprises a first reset spring, one end of the first reset spring is connected to the elastic reset member, and the elastic reset member is disposed between the first reset spring and the adjusting screw.
6. The detuning calibration device according to claim 5, wherein a central axis of the first return spring coincides with a central axis of the adjusting screw.
7. The demodulation calibration device according to claim 3, wherein the adjusting member further comprises an adjusting knob sleeved on the outer wall of the adjusting screw and in threaded fit with the adjusting screw, and the outer wall of the adjusting knob is provided with a scale for indicating the displacement of the adjusting screw.
8. The demodulation calibration device according to any one of claims 3 to 7, wherein one end of the elastic reset member is connected to the inner wall of the cavity, the other end of the elastic reset member is suspended, and the adjusting member and the auxiliary reset member are both disposed close to the other end of the elastic reset member.
9. A reflective fiber grating system comprising a reflective fiber grating and the detuning and calibration device according to any of claims 1 to 8, wherein the reflective fiber grating is disposed on the elastic reset member.
10. A reflective fiber grating system according to claim 9, further comprising an adhesive layer for adhering the reflective fiber grating to the resilient return member.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011466754.8A CN112504311A (en) | 2020-12-14 | 2020-12-14 | Reflection type fiber grating system and demodulation calibration device |
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| CN202011466754.8A CN112504311A (en) | 2020-12-14 | 2020-12-14 | Reflection type fiber grating system and demodulation calibration device |
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| CN112504311A true CN112504311A (en) | 2021-03-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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