CN115014606B - Fiber bragg grating dynamic torque measuring device and measuring method based on off-axis interconnector - Google Patents
Fiber bragg grating dynamic torque measuring device and measuring method based on off-axis interconnector Download PDFInfo
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- CN115014606B CN115014606B CN202210583027.2A CN202210583027A CN115014606B CN 115014606 B CN115014606 B CN 115014606B CN 202210583027 A CN202210583027 A CN 202210583027A CN 115014606 B CN115014606 B CN 115014606B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/08—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving optical means for indicating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The optical fiber grating dynamic torque measuring device based on the off-axis interconnector comprises an off-axis interconnector composed of a plane disc and a conical cylindrical disc, wherein the diameter of the conical bottom surface of the conical disc is the same as that of the plane disc, and the conical bottom surface of the conical disc and one surface of the plane disc are arranged at a set distance in a relative way, through holes are coaxially formed in the centers of the plane disc and the conical cylindrical disc, an ASE broadband light source is connected with an incident light port on the conical disc through an optical fiber collimator, the fiber bragg grating demodulator is connected with an emergent light port on the conical disc, one side of the planar disc, far away from the conical disc, is provided with a fiber collimator connected with an incident light port on the planar disc and a fiber collimator connected with the emergent light port of the planar disc, the other ends of the two fiber collimators are respectively connected with an annular device, and the annular device is connected with a fiber bragg grating strain gauge stuck on the measured elastic shaft through the fiber bragg grating connector. The invention can measure dynamic torque under the condition that the central part of the rotating part is occupied under the strong interference.
Description
Technical Field
The invention relates to measurement of dynamic torque of fiber bragg gratings. In particular to a fiber bragg grating dynamic torque measuring device and a measuring method based on an off-axis interconnector.
Background
Torque measurement is extremely widely applied in the fields of ships, automobiles and the like, and in very complex environments, particularly in severe conditions such as severe vibration, strong electromagnetic interference, high temperature and high humidity and even under water possibly, the torque measurement is often difficult to accurately measure, and compared with other torque measurement modes, the fiber bragg grating can play a role which cannot be played by other electrical sensors in the environment. With the rapid development of optical fiber technology, optical fiber rotary connectors have been widely used in the fields of military national defense, industrial control, energy, medical treatment and the like. In some devices or apparatuses, communication between relatively rotating components is required, and transmission of signals such as video signals, audio signals, control signals, sensing signals, etc., a common feature of most of the existing optical fiber rotary connectors is that the transmission of optical signals occupies a central rotational axis position. In some complex optical signal transmission processes, transmission of other media such as electrical signals or mechanical transmission shafts are sometimes accompanied, and when the axis of the rotating component is occupied, a common optical fiber rotating connector is not suitable. Therefore, there is a need for an off-axis dynamic torque measurement method that can resist strong interference and can achieve bidirectional signal transmission.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a fiber bragg grating dynamic torque measuring device and a measuring method based on an off-axis interconnection device, which can be used for measuring dynamic torque under the condition that the central part of a rotating part is occupied under the condition of strong interference.
The technical scheme adopted by the invention is as follows: the fiber grating dynamic torque measuring device based on the off-axis interconnector comprises an ASE broadband light source for providing a measuring light source and a fiber grating demodulator for obtaining a measured elastic axis dynamic torque measuring result according to a received reflected light signal, and is further provided with the off-axis interconnector, wherein the off-axis interconnector is composed of a plane disc and a conical cylindrical disc, the diameter of the conical bottom surface of the conical disc is the same as that of the plane disc, the conical bottom surface is opposite to one surface of the plane disc and is set at a set distance, through holes for penetrating through a measured elastic axis are formed in the centers of the plane disc and the conical cylindrical disc coaxially, the ASE broadband light source is connected with a first incident light port on the conical disc through a first incident fiber collimator, the fiber grating demodulator is connected with the first emergent light port on the conical disc through the first emergent fiber collimator, one end of the plane disc is far away from the second incident fiber collimator connected with the second incident light port on the plane disc, one end of the second fiber collimator is connected with the second emergent collimator on the plane disc, and the second fiber collimator is connected with the annular fiber collimator on the other end of the annular collimator through the annular fiber collimator, and the annular collimator is connected with the annular fiber collimator on the other end of the annular collimator.
The second emergent light port and the second incident light port on the plane disc are respectively formed on the disc surface around the central through hole.
The first incident light port and the first emergent light port on the conical disc are respectively formed on the inclined side surfaces of the conical disc.
During measurement, the measured elastic shaft is fixedly connected with the plane disc and is movably connected with the conical disc.
A measuring method of a fiber bragg grating dynamic torque measuring device based on an off-axis interconnector comprises the following steps:
1) The ASE broadband light source inputs optical signals from one surface of the conical cylindrical disc through the first incident optical fiber collimator, outputs the optical signals from the other surface, adjusts the incident angle of the first incident optical fiber collimator, observes the output result, and finds the incident angle with the minimum transmission loss by calculating the loss of the optical signals;
2) The first incident optical fiber collimator is fixed on a first incident light port on the conical cylindrical disc according to an incident angle with minimum transmission loss, a measured elastic shaft sequentially penetrates through the planar disc and the conical cylindrical disc, and the measured elastic shaft is fixedly connected with the planar disc and is movably connected with the conical cylindrical disc; pasting a fiber bragg grating strain gauge connected with an circulator through a fiber on a measured elastic shaft, and applying torque to the measured elastic shaft through rotation of an external motor;
3) The ASE broadband light source inputs an optical signal from one surface of the conical cylindrical disc through a first incident optical fiber collimator, and the optical signal is emitted from a second emergent light port of the planar disc after being reflected between the planar disc and the conical cylindrical disc for multiple times, enters an circulator through the collimator and an optical fiber, and then enters an optical fiber grating strain gauge through the circulator;
4) Narrow-band light with central wavelength reflected by the fiber bragg grating strain gauge is incident to the conical cylindrical disk again through the circulator, the collimator and the second incident light of the planar disk, and finally is output to the fiber bragg grating demodulator through the first emergent fiber collimator connected to the first emergent light port of the conical cylindrical disk after multiple reflections, and the current torque value is obtained through the fiber bragg grating demodulator.
The device and the method for measuring the dynamic torque of the fiber bragg grating based on the off-axis interconnector can be used for measuring the dynamic torque under the condition that the central part of the rotating part is occupied under the condition of strong interference, and have the characteristics of high coupling efficiency, dynamic transmission, capability of processing the paraxial transmission and the like. In the aspect of economic benefit, the method can be widely applied to occasions requiring CT scanning, rotary connection of optical signals and the like.
Drawings
FIG. 1 is a schematic diagram of a fiber grating dynamic torque measurement device based on an off-axis interconnect according to the present invention;
FIG. 2 is a schematic diagram of the front structure of a conical cylindrical disk in the invention;
FIG. 3 is a schematic side view of a conical cylindrical disk in accordance with the present invention;
FIG. 4 is a schematic view of the front face of a planar disk in accordance with the present invention;
fig. 5 is a schematic side view of a planar disk in accordance with the present invention.
In the figure
1: ASE broadband light source 2: elastic shaft to be tested
3: fiber bragg grating demodulator 4: ring device
5: fiber bragg grating strain gauge 6: plane disc
7: conical cylindrical disk 8: second emergent optical fiber collimator
9: second incident fiber collimator 10: first incident optical fiber collimator
11: first exit fiber collimator 12: first emergent light port
13: first incident light port 14: a second emergent light port
15: second incident light port
Detailed Description
The device and the method for measuring the dynamic torque of the fiber bragg grating based on the off-axis interconnector are described in detail below with reference to the embodiments and the accompanying drawings.
As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the fiber grating dynamic torque measuring device based on the off-axis interconnection device of the present invention includes an ASE broadband light source 1 for providing a measuring light source and a fiber grating demodulator 3 for obtaining a dynamic torque measuring result of a measured elastic axis 2 according to a received reflected light signal, and is further provided with an off-axis interconnection device, the off-axis interconnection device is composed of a planar disc 6 and a tapered cylindrical disc 7, the diameter of the tapered bottom surface of the tapered disc 7 is the same as the diameter of the planar disc 6, the tapered bottom surface is opposite to one surface of the planar disc 6 and is spaced by a set distance, through holes for penetrating the measured elastic axis 2 are formed coaxially at the centers of the planar disc 6 and the tapered cylindrical disc 7, the ASE broadband light source 1 is connected to a first incident light port 13 on the tapered disc 7 through a first incident fiber collimator 10, the fiber grating demodulator 3 is connected to a first light port 12 on the tapered disc 7 through a first emergent fiber collimator 11, one side of the planar disc 6 is far from the planar disc 6 is provided with a second plane 6 and is connected to a second optical collimator 8 through a second optical collimator 8 on the annular disc 4, and the second optical collimator is connected to a second optical collimator 4 through a second annular collimator 4, and the second optical collimator is connected to the second optical collimator 4 through a second annular collimator 4 is connected to the second optical collimator 4 through a second optical collimator 4.
As shown in fig. 2 and 3, the first incident light port 13 and the first outgoing light port 12 on the conical disk 7 are formed on the inclined side surfaces of the conical disk 7, respectively.
As shown in fig. 4 and 5, the second light exit 14 and the second light entrance 15 of the planar disk 6 are formed on the disk surface around the central through hole.
The invention relates to a fiber bragg grating dynamic torque measuring device based on an off-axis interconnector, wherein during measurement, a measured elastic shaft 2 is fixedly connected with a plane disc 6 and is movably connected with a conical disc 7.
The measuring method of the fiber bragg grating dynamic torque measuring device based on the off-axis interconnector comprises the following steps:
1) The ASE broadband light source 1 inputs optical signals from one surface of the conical cylindrical disc 7 through the first incident optical fiber collimator 10, outputs the optical signals from the other surface, adjusts the incident angle of the first incident optical fiber collimator, observes the output result, and finds the incident angle with the minimum transmission loss by calculating the loss of the optical signals;
2) The first incident optical fiber collimator 10 is fixed on a first incident light port 13 on the conical cylindrical disc 7 according to an incident angle with minimum transmission loss, the elastic shaft 2 to be measured sequentially penetrates through the planar disc 6 and the conical cylindrical disc 7, and the elastic shaft 2 to be measured is fixedly connected with the planar disc 6 and is movably connected with the conical cylindrical disc 7; the fiber bragg grating strain gauge 5 connected with the circulator 4 through the optical fiber is stuck on the elastic shaft 2 to be tested, and torque is applied to the elastic shaft 2 to be tested through rotation of an external motor;
3) The ASE broadband light source 1 inputs an optical signal from one surface of the conical cylindrical disc 7 through a first incident optical fiber collimator 10, and outputs the optical signal from a second output light port 14 of the planar disc 6 after multiple reflections between the planar disc 6 and the conical cylindrical disc 7, and the optical signal enters the circulator 4 through the collimator 8 and the optical fiber and then enters the fiber bragg grating strain gauge 5 from the circulator 4;
4) When the external motor rotates to apply torque M to the elastic shaft 2 to be measured, the elastic shaft 2 to be measured with the length L is subjected to torsion to generate strain tau, namely torsion deformation, and if the deformation is very small at this time, the length and the cross section area of the elastic shaft 2 to be measured are not changed, any two cross sections of the elastic shaft 2 to be measured relatively rotate around the central axis, so that a torsion angle is generated, and when the shearing stress applied to the elastic shaft 2 to be measured does not exceed the bearing limit of a material, the torque M is expressed as:
wherein r is the radius of the cross section of the elastic shaft to be measured; i is the polar moment of inertia of the elastic axis to be measured; g is the shear modulus of the material; τ is the maximum shear strain at the surface of the measured elastic shaft;
the fiber grating strain gauge 5 attached to the elastic shaft 2 to be measured reflects a narrow-band light having a wavelength corresponding to the torque value, which is the center wavelength of the narrow-band light, denoted as lambda B The amount of change Δλ in the center wavelength of the narrowband light B The following relationship with strain τ:
wherein alpha is the included angle between the fiber grating strain gauge and the axis of the elastic shaft to be measured, K ε The strain sensitivity coefficient of the fiber bragg grating strain gauge is;
based on the above principle, the narrow-band light reflected by the fiber bragg grating strain gauge 5 and having a central wavelength is incident to the conical cylindrical disk 7 again through the circulator 4, the collimator 9 and the second incident light 15 of the planar disk 6, and finally is output to the fiber bragg grating demodulator 3 from the first emergent fiber collimator 11 connected to the first emergent light port 12 of the conical cylindrical disk 7 after multiple reflections, and the current torque value is obtained through the fiber bragg grating demodulator 3.
Claims (2)
1. The fiber bragg grating dynamic torque measuring device based on the off-axis interconnector comprises an ASE broadband light source (1) for providing a measuring light source and a fiber bragg grating demodulator (3) for obtaining a dynamic torque measuring result of a measured elastic shaft (2) according to a received reflected light signal, and is characterized by further comprising the off-axis interconnector, wherein the off-axis interconnector is composed of a plane disc (6) and a cone cylindrical disc (7), the diameter of the cone bottom surface of the cone cylindrical disc (7) is the same as that of the plane disc (6), the cone bottom surface and one surface of the plane disc (6) are oppositely arranged and are separated by a set distance, through holes for penetrating the measured elastic shaft (2) are coaxially formed in the centers of the plane disc (6) and the cone cylindrical disc (7), the ASE broadband light source (1) is connected with a first incident light port (13) on the cone cylindrical disc (7) through a first incident fiber collimator (10), the fiber bragg grating demodulator (3) is connected with a first emergent light port (12) on the cone cylindrical disc (7) through a first emergent collimator (11), a second incident optical fiber collimator (9) with one end connected with a second incident light port (15) on the plane disc (6) and a second emergent optical fiber collimator (8) with one end connected with a second emergent light port (14) of the plane disc (6) are arranged on one side, far away from the conical cylindrical disc (7), of the plane disc (6), the other ends of the second incident optical fiber collimator (9) and the second emergent optical fiber collimator (8) are respectively connected with two ends of a circulator (4), and the circulator (4) is connected with a fiber bragg grating strain gauge (5) adhered on a tested elastic shaft (2) through an optical fiber connector;
a second emergent light port (14) and a second incident light port (15) on the plane disc (6) are respectively formed on the disc surface around the center through hole;
a first incident light port (13) and a first emergent light port (12) on the conical cylindrical disk (7) are respectively formed on the inclined side surfaces of the conical cylindrical disk (7);
during measurement, the measured elastic shaft (2) is fixedly connected with the plane disc (6) and is movably connected with the conical cylindrical disc (7).
2. A method of measuring an off-axis interconnect based fiber grating dynamic torque measurement apparatus as defined in claim 1, comprising the steps of:
1) An ASE broadband light source (1) inputs an optical signal from one surface of a conical cylindrical disc (7) through a first incident optical fiber collimator (10), outputs the optical signal from the other surface, adjusts the incident angle of the first incident optical fiber collimator, observes the output result, and finds the incident angle with the minimum transmission loss by calculating the loss of the optical signal;
2) The first incident optical fiber collimator (10) is fixed on a first incident light port (13) on the conical cylindrical disc (7) according to an incident angle with minimum transmission loss, the elastic shaft (2) to be tested sequentially penetrates through the planar disc (6) and the conical cylindrical disc (7), and the elastic shaft (2) to be tested is fixedly connected with the planar disc (6) and is movably connected with the conical cylindrical disc (7); a fiber bragg grating strain gauge (5) connected with an circulator (4) through an optical fiber is stuck on the elastic shaft (2) to be tested, and torque is applied to the elastic shaft (2) to be tested through rotation of an external motor;
3) The ASE broadband light source (1) inputs an optical signal from one surface of the conical cylindrical disc (7) through a first incident optical fiber collimator (10), outputs the optical signal from a second light output port (14) of the planar disc (6) after multiple reflections between the planar disc (6) and the conical cylindrical disc (7), and enters the circulator (4) through the collimator (8) and the optical fiber, and then enters the fiber grating strain gauge (5) through the circulator (4);
4) Narrow-band light with central wavelength reflected by the fiber bragg grating strain gauge (5) is incident to the conical cylindrical disk (7) again through the circulator (4), the collimator (9) and the second incident light port (15) of the plane disk (6), and finally is output to the fiber bragg grating demodulator (3) from the first emergent fiber collimator (11) connected to the first emergent light port (12) of the conical cylindrical disk (7) after multiple reflections, and the current torque value is obtained through the fiber bragg grating demodulator (3).
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| CN202210583027.2A CN115014606B (en) | 2022-05-26 | 2022-05-26 | Fiber bragg grating dynamic torque measuring device and measuring method based on off-axis interconnector |
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| CN202210583027.2A CN115014606B (en) | 2022-05-26 | 2022-05-26 | Fiber bragg grating dynamic torque measuring device and measuring method based on off-axis interconnector |
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| CN115014606B true CN115014606B (en) | 2023-08-01 |
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| CN115979481B (en) * | 2023-02-13 | 2023-05-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | High-speed rotation shaft torque measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB991782A (en) * | 1960-05-20 | 1965-05-12 | Nat Res Dev | Improvements in apparatus for the measurement of torsion and the like |
| GB2093992A (en) * | 1981-02-26 | 1982-09-08 | British Hovercraft Corp Ltd | Torque measurement apparatus |
| SU1571440A1 (en) * | 1987-11-30 | 1990-06-15 | Ижевский механический институт | Device for measuring torque of rotating shaft |
| JP4099055B2 (en) * | 2002-12-26 | 2008-06-11 | ミネベア株式会社 | Rotating body torque measuring device |
| EP1963816B1 (en) * | 2005-11-28 | 2017-05-17 | Vereniging voor Christelijk Hoger Onderwijs, Wetenschappelijk Onderzoek en Patiëntenzorg | Optical device comprising a cantilever and method of fabrication and use thereof |
| CN101109649A (en) * | 2007-05-23 | 2008-01-23 | 武汉理工大学 | Optical fiber grating sensing measuring method and device for detecting running state of rotating machine |
| CN105004884B (en) * | 2015-07-03 | 2018-12-28 | 北京航空航天大学 | A kind of SiC base micro-optics high temperature accelerometer and its design method |
| CN114323377B (en) * | 2021-12-24 | 2024-01-19 | 阿米检测技术有限公司 | Torque measuring method and torque measuring device |
| CN114295268B (en) * | 2022-01-04 | 2024-06-04 | 中国船舶重工集团公司第七0四研究所 | Fiber bragg grating rotation torque measurement system suitable for strong electromagnetic environment |
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