CN108871388A - Optical fiber touch sensor and sensor array - Google Patents
Optical fiber touch sensor and sensor array Download PDFInfo
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- CN108871388A CN108871388A CN201810441777.XA CN201810441777A CN108871388A CN 108871388 A CN108871388 A CN 108871388A CN 201810441777 A CN201810441777 A CN 201810441777A CN 108871388 A CN108871388 A CN 108871388A
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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
- G01D5/35306—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 using an interferometer arrangement
- G01D5/35309—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 using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—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 using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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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
- G01D5/35383—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 using multiple sensor devices using multiplexing techniques
- G01D5/35387—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 using multiple sensor devices using multiplexing techniques using wavelength division multiplexing
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Abstract
A kind of optical fiber touch sensor, includes the sensing layer of shaggy contact layer Yu the contact layer stackup including shaggy contact layer, and the sensing layer includes：Sensing layer substrate and multiple fixation members, form vacant area between each adjacent two, described vacant to divide into the first vacant area and the second vacant area；First single mode optical fiber, the single mode optical fiber line segment in the described first vacant area are in bending state；Fiber grating is prepared on the first single mode optical fiber, is placed in the described second vacant area；And strain isolating component, it is coated on outside the fiber grating of part to prevent the part fiber grating strain.It solves traditional touch sensing device not and can know that sliding when attribute and the contact of object is felt, and the problem that bending loss is big.
Description
Technical field
The invention belongs to sensor technology more particularly to a kind of optical fiber touch sensor and sensor arrays.
Background technique
In recent years, with the rapid development of artificial intelligence, intelligence machine man-based development is also greatly improved, this its
In involved one of key technology be exactly the tactilely-perceptible sensor technology of robot, and obtained lot of domestic and international research
The numerous studies of mechanism are put into.In intelligent robot technology, tactilely-perceptible sensor is robot and contact or institute
Grab the Primary Component that unknown object carries out the judgements such as attribute, pressure, temperature, roughness.Applied to the multi-functional of robot
Property touch sensor can imitate the sensing capability of human finger to the greatest extent, and by machine learning techniques so that intelligence
Energy robot can operate the behavior of more human fingers.The quality of touch sensor performance directly determines robot maincenter
The precision that system is judged is particularly applied to robot and medical prostheses of the popular medical surgery operation of comparison etc.
Instrument, the requirement to touch sensor are even more harshness.The accurate tactile tactility apparatus array of tight distribution can also further be opened
Hair is bionic machine application on human skin (Robotic Skin), so that other positions of robot in addition to hand can also accomplish to feel
Know the external world and interacts.Therefore, high-performance is developed, multi-functional intelligent touch sensor just seems particularly significant.Currently,
Touch sensing technology field mainly includes design and invention based on condenser type, piezoelectric type, pressure resistance type etc..Based on pressure drag
The flexible touch sensation sensor of formula and capacitive combination accurately can measure the power of three-dimensional simultaneously, and can be reduced metal surface
Caused by capacitive coupling bring interfere.But the capacitive combination of pressure drag, so that sensor unit itself is more complicated.Separately
Outside, thermally conductive, heat-insulated based on thermistor heating and multilayered structure progress, so that sensor device is more complicated.
With the development of optical fiber optics many years, optical fiber technology has also been widely used in Gao Ling other than the communications field
The exploitation of dependent sensor part.Using a variety of optical method for sensing, touch sensor also can be accomplished.Fibre optical sensor has
Small size, it is light, it is flexible, the advantages that low-loss, and it can integrate multiple sensors on an optical fiber, while can resist
Strong electromagnetic.Therefore, also there is very big flexibility and practicability using fibre optical sensor exploitation touch sensor.But tradition
General optical fiber touch sensor, can only but measure the information of power, and the detection based on luminous intensity, can also introduce biggish survey
Examination is uncertain.Also there is the information that can measure temperature and stress simultaneously, but not can know that attribute and the contact of object
When it is sliding feel, and two duplicate fiber bragg gratings also bring certain difficulty to preparation.
It is all the optical fiber of standard as used in current touch sensor device, there are biggish bending loss,
Cannot accomplish when array arrangement than comparatively dense, to improve spatial resolution.Currently, domestic also not no mature special fiber
Bragg grating touch sensor and to perceive active force simultaneously, temperature are sliding to feel and object carries out Attribute Recognition not have more
There is the machine skin based on multi-functional sensor array.And this kind of touch sensor and array are with intelligent robot in recent years
The fast development of technology, it may have very big market and exploitation demand.
Summary of the invention
The present invention provides a kind of optical fiber touch sensor and sensor array, it is intended to which solving traditional touch sensing device cannot
Know sliding feel when attribute and the contact of object, and the problem that bending loss is big.
A kind of optical fiber touch sensor, the sensing layer including shaggy contact layer Yu the contact layer stackup, wherein：
The sensing layer includes：
Sensing layer substrate, have first surface and the second surface opposite with the first surface, the second surface towards
The contact layer；
Multiple fixation members are arranged side by side in the second surface, wherein each adjacent two in multiple fixation members
Between form vacant area, it is described vacant to divide into the first vacant area and the second vacant area, the second vacant area of adjacent two
Between be separated by with the described at least one first vacant area；
First single mode optical fiber, one end extend along direction by multiple described solid for exporting input laser signal, the other end
The single mode optical fiber line segment determining component successively to fix, and being located in the described first vacant area is in bending state；
Fiber grating is prepared on the first single mode optical fiber, is placed in the described second vacant area；And
Strain isolating component is coated on outside the fiber grating of part to prevent the part fiber grating strain.
In addition, a kind of sensor array is additionally provided, including above-mentioned optical fiber touch sensor, more than two optical fiber tactiles
Sensor array arrangement, and connected using the first single mode optical fiber described in same, the fiber grating in the sensor array
Reflection wavelength along first single mode optical fiber extending direction be incremented by or successively decrease.
Above-mentioned optical fiber touch sensor utilize Fiber Bragg Grating technology and wavelength-division multiplex, can to the pressure of contactant,
Temperature is carried out while being sensed, and can judge that sliding when subject attributes and contact object object is felt, constitutes multi-functional tactile sensing
Device or sensor array.By the use of small size special type single mode optical fiber, optical power loss is reduced, optical fiber can carry out small curved
Song accomplishes the tactile sensing unit of the type extremely compact, and can easily be integrated into touch sensor battle array
Column form distributed sensing network, realize " machine " skin.Different sliding speeds can be measured by shaggy contact surface
Under vibration frequency, to perceive sliding feel.Above-mentioned touch sensor or array can be applied severe in electromagnetism interference etc.
In environment, and the sensitivity measured and precision are high, and response is fast；By the close arrangement of multiple fiber gratings, can also have
There is high spatial resolution.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one-dimensional tactile sensing array provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the sensing layer of the optical fiber touch sensor of minimum unit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the sensing layer of one-dimensional tactile sensing array provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of two-dimentional tactile sensing array provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram that tactile sensing array provided in an embodiment of the present invention is applied to palm.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 to 4 is please referred to, optical fiber of embodiment of the present invention touch sensor (sensing unit) 10 includes shaggy contact
Layer 100, supporting layer 300 and the sensing layer 200 being disposed there between.Supporting layer 300 is folded with sensing layer 200 and is set, and towards biography
Feel the first surface of layer 200.
Supporting layer 300 includes supporting layer substrate 310 and at least one support portion 320；Sensing layer 200 includes sensing layer substrate
210, multiple fixation members 220, the first single mode optical fiber 230, fiber grating 240 and strain isolating component 250.
The outer surface forming curves channel structure of contact layer 100, simulates human skin epidermis, and curve channel structure can lead to
Cross micro Process or 3D printing.
Sensing layer substrate 210 has towards 310 first surface of supporting layer substrate and second table opposite with the first surface
Face, second surface is towards contact layer 100.Support portion 320 is arranged between supporting layer substrate 310 and sensing layer substrate 210 and divides
It does not offset with first surface；Multiple fixation members 220 are arranged side by side in second surface, wherein every phase in multiple fixation members 220
Vacant area is formed between two adjacent, vacant to divide into the first vacant area 221 and the second vacant area 222, adjacent two second empty
It sets and is separated by between area 222 at least one first vacant area 221；One end of first single mode optical fiber 230 is for exporting input laser
Signal, the other end of the first single mode optical fiber 230 extend along direction and are successively fixed by multiple fixation members 220, and are located at first
Single mode optical fiber line segment 231 in vacant area 221 is in bending state；Fiber grating 240 is prepared on the first single mode optical fiber 230, and
It is placed in the second vacant area 222；Strain isolating component 250 is coated on outside part fiber grating 240 to prevent the part fiber
Grating 240 strains.
It is understood that fixation member 220 can be three or more, and at least two vacant areas of formation, adjacent two
It can be separated by between second vacant area 222 with the first vacant area 221 that the single mode optical fiber line segment 231 of a bending state is arranged,
It can also be separated by with the multiple first vacant areas 221, specifically see the accuracy requirement of sensor；Further, vacant area further includes placing
The vacant area 223 of the third of the single mode optical fiber line segment 232 of straight line, the vacant area 223 of third can be located at adjacent two it is second vacant
Between area 222, the edges at two ends of optical fiber touch sensor 10 can also be located at.
Wherein, a fiber grating 240 and a single mode optical fiber line segment in bending state are only distributed in sensing layer 200
231, i.e. a first vacant area 221 and a second vacant area 222 constitute a minimum sensing unit 10 (as shown in Figure 2),
More than two sensing units 10 form a sensor array 20.10 array arrangement of sensing unit in sensor array 20, and utilize
The first single mode optical fiber of same 230 connects.Preferably, in sensor array 20 along the extending direction of the first single mode optical fiber 230 phase
It is separated by between two adjacent the second vacant areas 222 at least one first vacant area 221.Sensor array 20 can be the one of 1 × N
Array is tieed up, the two-dimensional array of M × N can also be formed.The reflection wavelength of fiber grating 240 in sensor array 20 is along the first single mode
The extending direction of optical fiber 230 is incremented by or successively decreases.The position of reflection wavelength is located at 850nm or 1310nm or 1550nm tri- often
The fiber work wave band window seen, while also may be selected in visible light wave range window.As shown in figs. 1 and 3, one-dimensional touch sensor
Array, three tactile sensing units 10 constitute linear distribution, but the compound number of unit 10 is not limited to 3.As shown in figure 4,
Two-dimensional 2 × 4 tactile sensor array 22, but the compound number of sensing unit 10 is also not limited to 2 × 4, it can be according to reality
Different demands determine.
In one embodiment, fixation member 220 is the bulge-structure being formed on second surface, is opened up on bulge-structure
There are the through-hole passed through for the first single mode optical fiber 230 or gap (not shown).The bottom surface of bulge-structure can for rectangle, diamond shape,
Trapezoidal etc., top surface is the lower arc-shaped curved surface in intermediate projections both sides.In other embodiments, fixation member 220 can be viscous
Rubberizing body or adhesive plaster etc., or groove substitution that can be prefabricated on the second surface directly by sensing layer substrate 210.
200 sensing layer of sensing layer is elastomeric polymer, can be 573 silica gel and curing agent in mass ratio 10：1 is mixing cured；
Or liquid dimethyl silicone polymer and corresponding curing agent carry out proportion solidification (that is to say PDMS)；Preparation is logical in advance
It crosses micro Process or 3D printer prepares the mold of reverse geometry, then above-mentioned elastomeric polymer is poured into, after curing molding
To sensing layer substrate 210.The first single mode optical fiber 230 with fiber grating 240 is according to sensor base along first direction
The bulge-structure being intervally arranged is distributed, and first single mode optical fiber 230 at 240 both ends of each fiber grating has a microbend
Single mode optical fiber line segment 231.The single mode optical fiber line segment 231 of microbend is assisted using semi-cylindrical hill inclined-plane or prefabricated groove
Fibre-optical bending, after fiber distribution is completed, top is flat with same elastomeric polymer envelope again.Complete sensing layer 200 is one
Film, and the first single mode optical fiber 230 with fiber grating 240 is embedded to centre.
In one example, fiber grating 240 is fiber bragg grating, and two for forming one second vacant area 222 are solid
The length of the distance and the fiber grating 240 for being placed in the second vacant area 222 of determining component 220 matches, so that optical fiber Bradley
Lattice grating is fixed between two fixation members 220.And 230 part of the first single mode optical fiber close to fiber bragg grating is adopted
With microbend state, and it is fixed between two neighboring fixation member 220.And support portion 320 is wedge-shaped projection structure, Duo Gezhi
(periodicity) is arranged in 320 spacing side by side of support part, and sensing layer 200 and supporting layer 300 are similarly elastomeric polymer and are made, but supporting layer
300 hardness are high compared with sensing layer 200.Fiber bragg grating quantity is depending on integrated " machine " skin size dimension, each
The reflection wavelength of grating is different, is incremented by or successively decreases along the wavelength that moves towards of optical fiber, and in principle during the test adjacent two
The wavelength location of a grating does not overlap.
Strain isolating component 250 is coated on the side on 240 length direction of fiber grating, and strain isolating component 250
Length for the length of its fiber grating 240 coated half.Strain isolating component 250 is casing, V-groove or the U of metal
Type groove, Bragg grating are placed in one blend compounds hydropexis.Strain isolating device is made of the good metal material of thermal conductivity, can be with
For metal sleeve, or metallic channel, or other any shapes, the purpose is to fixed fiber bragg gratings
Half so that the part grating is not influenced by stress, but does not influence its temperature-responsive.
In one embodiment, the first vacant area 221 faces setting with support portion 320, and more than two first is empty
It sets area 221 and is aligned setting respectively with more than two support portions 320.The wedge-shaped projection structure top end of supporting layer 300
The part of 200 single mode optical fiber microbend of sensing layer is just supported, and fiber grating 240 is then located between two wedge shapes.Support
The elastic polymer material that is prepared by of layer 300 is printed by micro Process or 3D printer, and hardness is harder than sensing layer 200, but
Entirety is still flexibility.Supporting layer 300 be periodic wedge-shaped projection structure, the two of 200 optical fiber of gap periods and sensing layer
A microbend bulge clearance is consistent.The single mode optical fiber line segment 231 of bending state in the corresponding sensing layer 200 of each support portion 320
Position, fiber bragg grating are located between two support portions 320.Sensing layer 200 is consistent with 300 size of supporting layer, shape, leads to
It crosses the same polymer material of sensing layer 200 to permeate entirety, forms novel multi-functional touch sensor or array.
In a further embodiment, the supporting layer 300 in the touch sensor or array can be omitted, only by sensing layer
200 and contact layer 100 form, use sensor when this scheme that can reduce the sensitivity of pressure only, but because save support
Layer 300, and the thinner of touch sensor or array can be made, therefore can implement according to actual needs.
In a further embodiment, optical fiber touch sensor 10 further includes spontaneous heating optical fiber 260, spontaneous heating optical fiber 260
It is arranged side by side with fiber grating 240, spontaneous heating optical fiber 260 accesses laser signal, spontaneous heating optical fiber by the second single mode optical fiber 270
260 can heat the sensing point by absorbing certain laser, until specific temperature.Flexibly additional spontaneous heating optical fiber 260, is used
In the film for heating the part, the temperature change that Bragg grating measures can be used for judging the attribute of contact object object, add
Hotspot's distribution can be determined according to application demand.In this way, 240 side of fiber grating of the part sensing unit 10 of sensor array 20
Can be arranged a spontaneous heating optical fiber 260 simultaneously, and length is consistent with Bragg grating length, and one end is connected to the access of the second single mode optical fiber
Laser signal can carry out selective heating to the position of different " machine " skins.It can be used for measurement while temperature and pressure；It is right
It is locally heated to constant temperature, when contacting different objects by different heat losses, can judge its attribute simultaneously；Curve channel
When contact object object slides, it can feel by the way that caused microvibration measuring is sliding.
The shape of single mode optical fiber trend and " machine " skin in sensing layer 200, can do the bending of slight radius, be bent
Radius is bent introduced optical power loss still in 1dB or less in 3 mm size.Single mode optical fiber can be bend-insensitive
General single mode fiber, fibre cladding diameter be 125 microns；It may be small size single mode optical fiber, the diameter of covering is less than 125
Micron, even up to 50 microns.In addition, single mode optical fiber can be special optical fiber, there is the special micro- knot of airport in covering
Structure, purpose can make the bending loss of the type optical fiber smaller；It can also accomplish the fiber bragg grating of the type
There is high sensitivity to mechanical parameters such as stress, and to temperature-insensitive；It can also accomplish that polarization is kept, the type optical fiber Bradley
Measurement while stress and temperature may be implemented in lattice grating.
Touch sensor and sensor array 20 can be designed as " machine " skin according to different demands.One example such as Fig. 5
It is shown, such as intelligent robot palm 1 is arranged using case, sensor array 20 is distributed in finger top or palm, and shape is big
It is small because demand customize.Using case column or other positions or human body artificial limb, the ability for perceiving extraneous contactant is realized
Working principle：In 20 contact object object of sensor or sensor array, the pressure that object applies causes optical fiber
Bragg grating stretches red shift or the blue shift that perhaps compression causes optical grating reflection wavelength.Due to the design of strain isolating device,
The fiber bragg grating of half is not by pressure influence, and optical grating reflection peak is divided into two by the pressure that object applies, and one right
Should be without the grating of strain isolating device part, another is corresponding with the grating of strain isolating device.The temperature information of object
It is reflected in the change in location of entire optical grating reflection wavelength, and the information of pressure is only reflected in the light of no strain isolating device part
Grid, using the drift of two reflection peaks, to obtain the information of temperature and pressure.In contact object object sliding process, sensing layer
200 top surface is contact surface, and densely distributed curved slot can cause different vibration frequencies under different gliding cable structures,
Reflect on the reflection wavelength of fiber bragg grating.By, in the analysis of frequency domain, utilizing engineering to bragg wavelength signal
Habit technology obtains sliding feel information.The spontaneous heating optical fiber 260 introduced according to demand can be controllable by inputting certain laser power
Heat the temperature of corresponding sensing point in ground.Touch sensor or array are being increased to specific temperature and are maintaining, different right in contact
When as object, corresponding fiber bragg grating measures the loss of heat, and then judges the attribute of object.
Only described above is presently preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of optical fiber touch sensor, which is characterized in that the sensing including shaggy contact layer Yu the contact layer stackup
Layer, wherein：
The sensing layer includes：
Sensing layer substrate has first surface and the second surface opposite with the first surface, and the second surface is towards described
Contact layer；
Multiple fixation members are arranged side by side in the second surface, wherein in multiple fixation members between each adjacent two
Form vacant area, it is described it is vacant divide into the first vacant area and the second vacant area, between the second vacant area of adjacent two
It is separated by with the described at least one first vacant area；
First single mode optical fiber, one end extend along direction by multiple fixed parts for exporting input laser signal, the other end
Part is successively fixed, and the single mode optical fiber line segment being located in the described first vacant area is in bending state；
Fiber grating is prepared on first single mode optical fiber, is placed in the described second vacant area；And
Strain isolating component is coated on outside the fiber grating of part to prevent the part fiber grating strain.
2. optical fiber touch sensor as described in claim 1, which is characterized in that the fixation member is to be formed in described second
Bulge-structure on surface offers the through-hole passed through for first single mode optical fiber or gap on the bulge-structure.
3. optical fiber touch sensor as described in claim 1, which is characterized in that the strain isolating component is coated on the light
Side on fine grating length direction, and the length of the strain isolating component is the length of its fiber grating coated
Half.
4. the optical fiber touch sensor as described in claim 1, which is characterized in that the fiber grating is optical fiber Bragg light
Grid, first single mode optical fiber are extraordinary single mode optical fiber.
5. such as the described in any item optical fiber touch sensors of Claims 1-4, which is characterized in that the strain isolating component is
Casing, V-groove or the U-type groove of metal.
6. such as the described in any item optical fiber touch sensors of Claims 1-4, which is characterized in that it is vacant to form one described second
The distance of two fixation members in area and the length for the fiber grating for being placed in the second vacant area match.
7. such as the described in any item optical fiber touch sensors of Claims 1-4, which is characterized in that further include and the sensing layer
It is folded to set, and the supporting layer of the first surface towards the sensing layer, the supporting layer include supporting layer substrate and at least one branch
Support part；The support portion is arranged between the supporting layer substrate and the sensing layer substrate and offsets respectively with first surface.
8. optical fiber touch sensor as claimed in claim 7, which is characterized in that the first vacant area and the support portion phase
Face setting, and more than two first vacant areas are aligned respectively with more than two support portions and set
It sets, support portion is wedge-shaped projection structure.
9. optical fiber touch sensor as described in claim 1, which is characterized in that further include spontaneous heating optical fiber, the spontaneous heating
Optical fiber and the fiber grating are arranged side by side, and the spontaneous heating optical fiber accesses laser signal by the second single mode optical fiber.
10. a kind of sensor array, which is characterized in that passed including any one of more than two claims 1 to 9 optical fiber tactile
Sensor, more than two optical fiber tactile sensor array arrangements, and connected using the first single mode optical fiber described in same, it is described
The reflection wavelength of the fiber grating in sensor array is incremented by or successively decreases along the extending direction of first single mode optical fiber.
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| CN112179552A (en) * | 2020-10-09 | 2021-01-05 | 南京工程学院 | Optical fiber touch sensing array and method, signal demodulation optical path and method |
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