CN109932113A - The chirped fiber measuring system of power tactile superelevation spatial resolution - Google Patents
The chirped fiber measuring system of power tactile superelevation spatial resolution Download PDFInfo
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- CN109932113A CN109932113A CN201910127546.6A CN201910127546A CN109932113A CN 109932113 A CN109932113 A CN 109932113A CN 201910127546 A CN201910127546 A CN 201910127546A CN 109932113 A CN109932113 A CN 109932113A
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- chirped fiber
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Abstract
The present invention relates to a kind of chirped fiber measuring systems of power tactile superelevation spatial resolution, including the adjustable swept light source of wavelength linear, coupler, chirped fiber grating force-touch sensor, Faraday mirror, photoelectric conversion module, data acquisition module and computer, any position on the axial dimension of chirped fiber grating is corresponding with the actual wavelength size in reflectance spectrum 2nm bandwidth, and the wavelength of corresponding points changes when by ambient pressure, to realize the point distributed awareness of power tactile；Utilize the laser signal of the adjustable swept light source output of wavelength linear, it is incident on chirped fiber grating force-touch sensor and Faraday mirror respectively through coupler, the reflected light of chirp grating and the reflected light of Faraday mirror are input to photoelectric conversion module again through photo-coupler.
Description
Technical field
The invention belongs to touch sensing technology fields, are mainly used in the power tactile sensing skill of robot or intelligence manufacture
Art.The present invention relates to a kind of power tactile superelevation space resolution fiber optics chirp grating technologies.
Background technique
Tactile sensing be simulate people skin sensing, quantitative realization sensing unit (such as: manipulator, bionical antenna) with it is right
As the feeling of contact traction, it is in a kind of range of small, the sensing technology of high-space resolution precision.Currently, with Chinese people
The high speed development of work intelligent robot technology, many domestically produced machine people components precision, stability can substitute import.But
It is still to there is a technology still to rely on import, that is, tactile sensor technology is classified as China's card neck by Science and Technology Daily in 2018
One of sub- technology
The difficult point of touch sensing technology is the spatial resolution of power tactile, and conditional electronic touch sensing technology is in small space
Range integrates highdensity array sensing element, and the distance that sensing element is more, mutual is shorter, the coupled interference of interelement
So that being more difficult to accomplish accurately to export.
The patent application and authorization of domestic tactile sensing, concentrate on flexible electronic device field substantially, such as: being based on pressure resistance type
With a kind of Bionic flexible tactile sensing array (CN102589759A) high sensitivity tactile senser of capacitive combination
(CN108185997A) a kind of Novel electric of a kind of positive tetrahedron formula three-dimensional force flexible touch sensation sensor array (CN206281590U)
Sub- tactile skin (CN109029800A) etc.
But in comparison, the research achievement of Japan and America and Europe in electronics tactile sensing field is in the world with industrialization
The technical parameter of leading status, article and Patent design is above China, such as patent of the South Korea in terms of medical tactilely-perceptible
(KR1914979-B1), Japan softness haptic perception panel and tactile finger patent (JP2018180621-A,
JP2018175459-A) etc..As can be seen that late comer must bypass the correlation of forerunner specially in the pursuit of original technology
Otherwise benefit protection is likely to unless finding significantly superior solution because of the threshold reached that develops skill around patent.Therefore,
How around the external layout in tactile sensing field, the measurement parameter current from distributed fiber-optic sensor technological break-through is limited to,
It is the purpose of the invention patent.
Summary of the invention
In view of the above-mentioned problems, overcoming biography the purpose of the present invention is bypassing the technological means of electronic device array tactile sensing
The problems such as size of system piezoelectric device sensor array, mutual signal coupled interference, utilize the spatial dispersion of chirped fiber grating
Delay character designs the pressure tactile sensing device of high spatial resolution and provides measuring system.Technical solution is as follows:
A kind of chirped fiber measuring system of power tactile superelevation spatial resolution, including the adjustable sweep light of wavelength linear
Source, coupler, chirped fiber grating force-touch sensor, Faraday mirror, photoelectric conversion module, data acquisition module and meter
Calculation machine, the reflectance spectrum of the chirped fiber grating of the chirped fiber grating force-touch sensor are during 1550nm wavelength is
The heart, the broadband optical signal of bandwidth 2nm, in any position and reflectance spectrum 2nm bandwidth on the axial dimension of chirped fiber grating
Actual wavelength size it is corresponding, and the wavelength of corresponding points changes when by ambient pressure, to realize the point of power tactile
Distributed awareness；Using the laser signal of the adjustable swept light source output of wavelength linear, it is incident on chirped fiber respectively through coupler
Grating force-touch sensor and Faraday mirror, the reflected light of chirp grating and the reflected light of Faraday mirror are again through optocoupler
Clutch, is input to photoelectric conversion module, identifies the reflection wavelength and Faraday mirror of chirp grating one-dimensional space point position
Difference interference occurs in photoelectric conversion module for reflection wavelength, and the beat signal of output is by data collecting module collected, with frequency sweep
The one-dimensional space point of the different frequency beat signal positioning chirp grating of light source time synchronization scanning sample.
The invention adopts the above technical scheme, which has the following advantages:
(1) compared with existing electronics tactilely-perceptible scheme, the present invention realizes space with the mode of optics wavelength resolution
Power tactile discrimination rate, spatial resolution reach submillimeter magnitude, one higher than electronics tactilely-perceptible strategy parameter known today
The order of magnitude, higher than the parameter of human body tactile discrimination rate.
(2) present invention utilizes the wavelength in the reflectance spectrum bandwidth of chirped fiber grating from the angle of distributed fiber-optic sensor
Value and the one-to-one relationship in bulk position realize the optical mode measurement of high density spatial power tactilely-perceptible.
(3) present invention is sensed in optical region, is measured in electricity wave band, and the sensitivity and electricity for having taken into account optical sensing are surveyed
The convenience of amount.
Detailed description of the invention
Chirped fiber grating force-touch sensor Fig. 1 of the invention
Fig. 2 chirped fiber grating touch sensor signal demodulating system structure chart
Specific embodiment
Of the invention is described in detail with reference to the accompanying drawings and examples.
10 centimetres of chirped fiber grating length in Fig. 1, is considered as linear one dimensional structure.Wideband light source incidence chirped light
The reflection spectral width of fine grating corresponds to the length of chirped fiber grating, and the actual wavelength in reflectance spectrum corresponds to chirped fiber grating one
Tie up the position of power sensitive measurement point distribution in structure.Specific design is as follows: designing and producing 10cm axial dimension, 0.25mm radial ruler
Very little chirped fiber grating linear one dimensional sensing unit, i.e. chirped fiber grating force-touch sensor.Chirped fiber grating it is anti-
Penetrating spectrum is the broadband optical signal of bandwidth 2nm centered on 1550nm wavelength.Appointing on the axial dimension of chirped fiber grating 10cm
Anticipate position it is corresponding with the actual wavelength size in reflectance spectrum 2nm bandwidth, and when by ambient pressure corresponding points wavelength
It changes, the point distributed awareness of power tactile may be implemented.Therefore, to the Measurement Resolution of chirped fiber grating reflection wavelength,
Determine space point resolution of the chirped fiber grating as force-touch sensor within the scope of fiber lengths 10cm, it theoretically can be with
Realize the one-dimensional space point resolution of 0.5mm.
The positioning of power tactile measured point and the identification of power size are obtained using M-Z interference structure.Pass through chirped fiber grating
The heterodyne beat signal of reflected light and Faraday mirror reflected light is to tested point location；Using chirped fiber grating dispersion when
Delay characteristics, heterodyne beat caused by the dispersion Delay Variation by stress point change, in conjunction with sample swept light source synchronization time
Time frequency analysis, obtain stress size analysis.Fig. 2 is chirped fiber grating tactile sensing Signal Measurement System structure, wavelength
The laser signal of linear adjustable swept light source output, be incident on respectively through coupler chirped fiber grating force-touch sensor and
Faraday mirror, the reflected light of chirp grating and the reflected light of Faraday mirror are input to photoelectricity and turn again through photo-coupler
Change the mold block.The reflection wavelength of chirp grating one-dimensional space point position and the reflection wavelength of Faraday mirror are identified in photoelectric conversion
Difference interference occurs in module, the beat signal of output is adopted by data collecting module collected with the scanning of swept light source time synchronization
The one-dimensional space point of the different frequency beat signal positioning chirp grating of sample.When chirp grating spatial point stress, the optical fiber
Grating generates moment dispersion time delays, makes the beat signal of corresponding points that transient change occur, is somebody's turn to do by time frequency analysis
Point by force information.
Claims (1)
1. a kind of chirped fiber measuring system of power tactile superelevation spatial resolution, including the adjustable swept light source of wavelength linear,
Coupler, chirped fiber grating force-touch sensor, Faraday mirror, photoelectric conversion module, data acquisition module and calculating
Machine, centered on the reflectance spectrum of the chirped fiber grating of the chirped fiber grating force-touch sensor is 1550nm wavelength,
The broadband optical signal of bandwidth 2nm, the reality in any position and reflectance spectrum 2nm bandwidth on the axial dimension of chirped fiber grating
Border wavelength size is corresponding, and the wavelength of corresponding points changes when by ambient pressure, to realize the point distribution of power tactile
Perception；Using the laser signal of the adjustable swept light source output of wavelength linear, it is incident on chirped fiber grating respectively through coupler
Force-touch sensor and Faraday mirror, the reflected light of chirp grating and the reflected light of Faraday mirror are again through optical coupling
Device, is input to photoelectric conversion module, identify chirp grating one-dimensional space point position reflection wavelength and Faraday mirror it is anti-
Ejected wave is grown occurs difference interference in photoelectric conversion module, and the beat signal of output is by data collecting module collected, with sweep light
The one-dimensional space point of the different frequency beat signal positioning chirp grating of source time synchronous scanning sampling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910127546.6A CN109932113B (en) | 2019-02-20 | 2019-02-20 | Chirped fiber grating measuring system with ultrahigh spatial resolution for force touch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910127546.6A CN109932113B (en) | 2019-02-20 | 2019-02-20 | Chirped fiber grating measuring system with ultrahigh spatial resolution for force touch |
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| CN109932113A true CN109932113A (en) | 2019-06-25 |
| CN109932113B CN109932113B (en) | 2021-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608630A (en) * | 2020-12-09 | 2022-06-10 | 腾讯科技（深圳）有限公司 | Touch sensor, parameter testing method and device thereof and storage medium |
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| CN114608630B (en) * | 2020-12-09 | 2023-03-31 | 腾讯科技（深圳）有限公司 | Touch sensor, parameter testing method and device thereof and storage medium |
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| CN109932113B (en) | 2021-07-06 |
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