CN110095086B - Current type bidirectional bending sensor and preparation method thereof - Google Patents
Current type bidirectional bending sensor and preparation method thereof Download PDFInfo
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- CN110095086B CN110095086B CN201910477749.8A CN201910477749A CN110095086B CN 110095086 B CN110095086 B CN 110095086B CN 201910477749 A CN201910477749 A CN 201910477749A CN 110095086 B CN110095086 B CN 110095086B
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- 238000005452 bending Methods 0.000 title claims abstract description 80
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 230000004907 flux Effects 0.000 claims abstract description 54
- 230000008859 change Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 18
- 230000000903 blocking effect Effects 0.000 claims description 85
- 238000005253 cladding Methods 0.000 claims description 33
- 238000012545 processing Methods 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 claims description 17
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 14
- 230000010355 oscillation Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 5
- 238000010147 laser engraving Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000003486 chemical etching Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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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
- G01D5/12—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 using electric or magnetic means
- G01D5/14—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 using electric or magnetic means influencing the magnitude of a current or voltage
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- General Physics & Mathematics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses a current type bidirectional bending sensor and a preparation method thereof, which relate to the technical field of sensors and solve the problem that bidirectional bending degree cannot be measured. The technical scheme is characterized by comprising a light emitting component, a light receiving component and a flexible light guide element, wherein the light guide element has monotonicity in the change of luminous flux of the light guide element in the bidirectional bending process, the light emitting component and the light receiving component are respectively and fixedly arranged at two ends of the light guide element, the light emitting component comprises a light emitting element, the light receiving component comprises a light receiving element, and the light emitting element and the light receiving element are respectively positioned at two ends of the light guide element. The luminous flux of the photoconductive element corresponds to the bidirectional bending degree one by one, the photoconductive element bends along with the bending of the measured object, the luminous flux of the photoconductive element changes, the light after the change of the luminous flux is received by the light receiving element, and the light receiving element is used for converting the light into a current signal, so that the function of detecting the bidirectional bending degree of the measured object is realized.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a current type bidirectional bending sensor and a preparation method thereof.
Background
The sensor is a detection device, can collect the measured information, and can be converted into an electric signal or other information output in a required form according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The bending sensor is used for detecting the bending degree of a measured object, and among the bending sensors in the common market, a resistance type sensor is used for measuring the bending degree through the change of resistance of the resistance type sensor in the bending process, but the traditional resistance sensing type measuring scheme can only measure the unidirectional bending degree and cannot measure the bidirectional bending degree.
Disclosure of Invention
The invention aims to provide a current type bidirectional bending sensor and a preparation method thereof, which have the effect of measuring the bidirectional bending degree.
The technical aim of the invention is realized by the following technical scheme:
The current type bidirectional bending sensor comprises a light emitting component, a light receiving component and a flexible light guide element, wherein the light guide element has monotonicity in the change of luminous flux of the light guide element in the bidirectional bending process, the light emitting component and the light receiving component are respectively and fixedly arranged at two ends of the light guide element, the light emitting component comprises a light emitting element, the light receiving component comprises a light receiving element, and the light emitting element and the light receiving element are respectively positioned at two ends of the light guide element.
Further: the light emitting element is an active light emitting device in which the light emission amount is in direct proportion to the driving current.
Further: the light-emitting element is a light-emitting diode.
Further: the light receiving element is an active light flux detection device with output current in direct proportion to light flux received by the surface of the light receiving element under the condition that power supply voltage is unchanged.
Further: the light receiving element is a phototransistor.
Further: the light emitting component is characterized in that a first connecting piece is arranged between the light emitting component and the light guiding element, the first connecting piece is solid, the first connecting piece is provided with a first opening for accommodating the light emitting component, the first connecting piece is provided with a first connecting hole for accommodating one end of the light guiding element and penetrating through the first opening, and the first connecting piece is rigidly bonded with the light emitting component and the light guiding element through transparent adhesives.
Further: the light receiving assembly is characterized in that a second connecting piece is arranged between the light receiving assembly and the light guiding element and is solid, the second connecting piece is provided with a second opening for accommodating the light receiving assembly, the second connecting piece is provided with a second connecting hole for accommodating one end of the light guiding element and penetrating through the second opening, and the second connecting piece is rigidly bonded with the light receiving assembly and the light guiding element through transparent adhesives.
Further: the light guide element comprises a light guide body which is made of a material with a refractive index greater than 1 and flexible, and comprises at least 1 unit length section;
Within the unit length segment: the light guide body is provided with a light escape groove and a whispering gallery blocking groove, the light escape groove and the whispering gallery blocking groove extend along the length direction of the light guide body, the depth of the light escape groove is less than 1/20 of the width of the light guide body, the depth of the whispering gallery blocking groove does not exceed the depth of the light escape groove, the inner surface area of the light escape groove is not less than 4 times of the inner surface area of the whispering gallery blocking groove, and at least 1 cross section center of the light guide body is positioned on a connecting line of the geometric center of the surface of the light escape groove and the geometric center of the surface of the whispering gallery blocking groove;
The light guide member body is provided with a cladding outside, the light guide member body, the light escape groove and the whispering gallery blocking groove are all attached to the inner surface of the cladding, the outer surface of the cladding is a smooth and continuous surface, and the refractive index of the cladding is smaller than that of the light guide member body.
The preparation method of the current type bidirectional bending sensor comprises the following steps:
intercepting the photoconductive element: intercepting a suitable length of said light-guiding element having monotonicity in its luminous flux variation during bi-directional bending;
and (3) installing a connecting piece: placing two ends of the light guide element into a first connecting hole of a first connecting piece and a second connecting hole of a second connecting piece respectively, wherein the first connecting piece and the light guide element are rigidly bonded by using a transparent adhesive;
Mounting a light emitting assembly: placing the light emitting assembly into the first opening with the light emitting element at one end of the light guiding element, the light emitting assembly rigidly bonded to the first connector using a transparent adhesive;
Mounting a light receiving assembly: the light receiving assembly is placed in the second opening with the light receiving element at one end of the light guiding element, and the light receiving assembly is rigidly bonded to the first connector using a transparent adhesive.
Further: the step of intercepting the light guide element may further comprise the steps of:
Processing the light guide body: intercepting a material with a proper length and a refractive index larger than 1 as an emergent light guide body;
Processing a light ray escape groove: processing a light ray escape groove on the outer surface of the light guide body, and enabling the light ray escape groove to extend along the length direction of the light guide body, wherein the depth of the light ray escape groove is smaller than 1/20 of the width of the light guide body;
Processing echo wall blocking grooves: processing a whispering gallery blocking groove on the outer surface of the light guide member body, and enabling the whispering gallery blocking groove to extend along the length direction of the light guide member body, wherein the depth of the whispering gallery blocking groove is not more than that of a light ray escape groove, the inner surface area of the light ray escape groove is not less than 4 times of the inner surface area of the whispering gallery blocking groove, and at least 1 cross section center of the light guide member body is positioned on a connecting line of the geometric center of the surface of the light ray escape groove and the geometric center of the surface of the whispering gallery blocking groove;
machining a cladding: manufacturing a cladding layer which is attached to the outer surfaces of the light guide body, the light escape groove and the whispering gallery blocking groove on the outer surface of the light guide body by using a spraying or coating process method, wherein the refractive index of the material of the cladding layer is smaller than that of the light guide body;
And (3) surface treatment of a cladding: the cladding is subjected to extrusion shaping or cutting or condensation or curing treatment, and the outer surface of the cladding is flat and continuous.
In summary, the invention has the following beneficial effects:
The light source is provided to the light guide member by the light emitting element of the light emitting assembly, and the light passes through the light guide member from the light emitting element and irradiates onto the light receiving element of the light receiving assembly. When the amount of light emitted from the light emitting element is constant, the luminous flux of the light guiding element corresponds to the degree of bending one by one. The light guide element is bent along with the bending of the measured object, so that the luminous flux of the light guide element is changed, the light after the change of the luminous flux is received by the light receiving element, and the light receiving element is used for converting the light into a signal, thereby realizing the function of detecting the bending degree of the measured object.
Because the change of the luminous flux of the light guide element has monotonicity in the bidirectional bending process of the light guide element, the bending angle of the measured object corresponds to the bending degree of the light guide element one by one, and then the bending direction and the bending angle of the measured object can be obtained through the received light conversion signals by the light receiving element, so that the bidirectional bending detection effect is realized, the detection effect and the application range are effectively improved, the angle measurement is very convenient, and the measurement precision is higher. Under the condition that the power supply voltage is unchanged, the output current of the light receiving component and the luminous flux received by the surface are in a direct proportion relation, namely, the output current corresponds to the bending degree one by one, so that the bending direction and the bending angle of the measured object can be judged through the magnitude of the current.
Through the setting of light escape groove and whispering gallery blocking groove for the photoconductive element is no matter along the direction of light escape groove to whispering gallery blocking groove or along whispering gallery blocking groove to the direction bending of light escape groove, can all influence the geometric model of light path through light escape groove or whispering gallery blocking groove, makes the geometric model of light path and the geometric model mismatch of bending loss oscillation phenomenon, thereby eliminates the bending loss oscillation phenomenon of two-way bending. Therefore, the light flux is monotonously changed due to the fact that the bending loss oscillation phenomenon is eliminated when the light guide body bends the light flux in two different directions. In addition, the luminous flux also changes monotonically in the process that the light guide body bends from the straight state to the single direction or stretches from the bent state to the straight state along the single direction.
When the light guide body is in a straight state, due to the existence of the light escape groove and the echo wall blocking groove, a part of luminous flux of the light guide body is lost when the light guide body is in the straight state; when the light guide body is bent to one side of the light escape groove, the amount of light dissipated from the light escape groove is reduced, but the amount of light dissipated from the whispering gallery blocking groove is increased instead, and the total surface area in the light escape groove is larger than that in the whispering gallery blocking groove, so that the main factor causing the change of the luminous flux is the light escape groove, and the luminous flux is monotonically increased along with the bending of the light guide body to one side of the light escape groove; when the light guide body is bent to one side of the whispering gallery blocking groove, more light escapes from the cortex to be dissipated from the light escape groove, and the light escaping from the cortex of the whispering gallery blocking groove is reduced.
Therefore, the luminous flux of the light guide body changes monotonically and continuously no matter the light guide body bends along the direction of the whispering gallery blocking groove to the light ray escape groove or bends along the direction of the light ray escape groove to the whispering gallery blocking groove. Therefore, the photoconductive element can have a better measuring effect when being applied to the sensor for detecting the bidirectional bending degree, and can have wider applicable occasions.
The depths of the light escape grooves and the whispering gallery blocking grooves are each an order of magnitude smaller than the radius of the fiber core, and when the light guide body is bent, the total loss of the light guide element is approximately equivalent to the superposition of macrobending loss and microbending loss, so that the change of luminous flux is remarkable along with the bending of the light guide element. The change in the amount of light received by the light receiving element is significant, so that the change in the signal output by the light receiving element is also significant, and thus detection data with higher accuracy can be obtained.
The cladding is wrapped outside the light guide body, and the outer surface of the cladding is smooth and continuous, so that the appearance of the light guide element is consistent, continuous and flat everywhere, the whole structure is compact, the mechanical properties such as elasticity, toughness and tensile strength are approximately consistent with those of the conventional optical fiber, and the measuring effect and the service life are ensured. Therefore, compared with the conventional optical fiber, the novel light guide element and the manufacturing method thereof achieve the aim that the luminous flux changes monotonously with the bidirectional bending without sacrificing the service life of the light guide element body.
Drawings
FIG. 1 is a sectional view of a light escape groove and a whispering gallery blocking groove in embodiment 1;
FIG. 2 is a schematic view showing the structure of a light escape groove in example 1;
fig. 3 is a schematic structural diagram of a whispering gallery blocking groove in embodiment 1;
FIG. 4 is a schematic cross-sectional structure of the light guide body in embodiment 1;
FIG. 5 is a schematic view of the optical path of the photoconductive element in the natural flat state in embodiment 1;
FIG. 6 is a schematic view of the optical path of the light guiding member in embodiment 1 when it is bent toward the side close to the whispering gallery block groove;
FIG. 7 is a schematic view of the optical path of the light guiding member in example 1 when it is bent toward the side close to the light escape groove;
FIG. 8 is a sectional view of a light escape groove and a whispering gallery blocking groove in embodiment 2;
FIG. 9 is a schematic view showing the structure of a light escape groove in example 3;
Fig. 10 is a schematic structural view of a whispering gallery blocking groove in embodiment 3;
FIG. 11 is a sectional view of a light escape groove and a whispering gallery blocking groove in embodiment 4;
fig. 12 is a schematic cross-sectional structure of the light guide body in embodiment 5.
Reference numerals: 11. a light guide body; 12. a light escape groove; 13. echo wall blocking grooves; 14. a cladding layer; 15. a first connector; 16. a second connector; 21. a light emitting assembly; 22. and a light receiving assembly.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
the current type bi-directional bending sensor, as shown in fig. 1 to 7, includes a light emitting assembly 21, a light receiving assembly 22, and a light guiding member having flexibility, the refractive index of which is greater than 1, and which is an optical fiber in this embodiment. The light guiding element has monotonicity in the change of luminous flux of the light guiding element during the bidirectional bending process, the light emitting component 21 and the light receiving component 22 are respectively and fixedly arranged at two ends of the light guiding element, the light emitting component 21 comprises a light emitting element, the light receiving component 22 comprises a light receiving element, and the light emitting element and the light receiving element are respectively arranged at two ends of the light guiding element.
The light emitting element is an active light emitting device in which the amount of light emission is proportional to the drive current.
The light emitting element is a light emitting diode.
The light receiving element is an active light flux detection device with output current in direct proportion to light flux received by the surface of the light receiving element under the condition that the power supply voltage is unchanged.
The light receiving element is a phototransistor.
A first connecting piece 15 is arranged between the light emitting component 21 and the light guiding element, the first connecting piece 15 is solid, the first connecting piece 15 is provided with a first opening for accommodating the light emitting component 21, the first connecting piece 15 is provided with a first connecting hole for accommodating one end of the light guiding element and penetrating through the first opening, and the first connecting piece 15 is respectively rigidly bonded with the light emitting component 21 and the light guiding element through transparent adhesives.
A second connecting piece 16 is arranged between the light receiving component 22 and the light guiding element, the second connecting piece 16 is solid, the second connecting piece 16 is provided with a second opening for accommodating the light receiving component 22, the second connecting piece 16 is provided with a second connecting hole for accommodating one end of the light guiding element and penetrating through the second opening, and the second connecting piece 16 is respectively rigidly bonded with the light receiving component 22 and the light guiding element through transparent adhesives.
The light guide element comprises a light guide body 11, the light guide body 11 is made of a material with a refractive index larger than 1 and flexible, and the light guide body 11 comprises at least 1 unit length section;
Within a unit length of: the light guide body 11 is provided with a light escape groove 12 and a whispering gallery blocking groove 13, the light escape groove 12 and the whispering gallery blocking groove 13 extend along the length direction of the light guide body 11, the depth of the light escape groove 12 is smaller than 1/20 of the width of the light guide body 11, the depth of the whispering gallery blocking groove 13 does not exceed the depth of the light escape groove 12, the inner surface area of the light escape groove 12 is not smaller than 4 times of the inner surface area of the whispering gallery blocking groove 13, and at least 1 cross section center of the light guide body 11 is positioned on a connecting line of the geometric center of the surface of the light escape groove 12 and the geometric center of the surface of the whispering gallery blocking groove 13.
The outside of the light guide body 11 is provided with a cladding layer 14, the surfaces of the light guide body 11, the light escape groove 12 and the whispering gallery blocking groove 13 are all attached to the inner surface of the cladding layer 14, the outer surface of the cladding layer 14 is a flat and continuous surface, and the refractive index of the cladding layer 14 is smaller than that of the light guide body 11.
The preparation method of the current type bidirectional bending sensor comprises the following steps:
s1, processing the light guide body 11: intercepting a material with a proper length and a refractive index larger than 1 as the light-emitting guide body 11;
S2, processing a light ray escape groove 12: processing a light ray escape groove 12 on the outer surface of the light guide body 11, and enabling the light ray escape groove 12 to extend along the length direction of the light guide body 11, wherein the depth of the light ray escape groove 12 is smaller than 1/20 of the width of the light guide body 11;
S3, processing the echo wall blocking groove 13: processing a whispering gallery blocking groove 13 on the outer surface of the light guide body 11, enabling the whispering gallery blocking groove 13 to extend along the length direction of the light guide body 11, enabling the depth of the whispering gallery blocking groove 13 not to exceed the depth of the light escape groove 12, enabling the inner surface area of the light escape groove 12 to be not smaller than 4 times of the inner surface area of the whispering gallery blocking groove 13, and enabling at least 1 cross section center of the light guide body 11 to be located on a connecting line of the geometric center of the surface of the light escape groove 12 and the geometric center of the surface of the whispering gallery blocking groove 13;
S4, machining the cladding layer 14: a cladding layer 14 which is attached to the outer surfaces of the light guide body 11, the light escape groove 12 and the whispering gallery blocking groove 13 is manufactured on the outer surface of the light guide body 11 by using a spraying or coating process, wherein the refractive index of the cladding layer 14 is smaller than that of the light guide body 11;
s5, surface treatment of the cladding 14: extruding, shaping, cutting, condensing or curing the cladding 14 to make the outer surface of the cladding 14 smooth and continuous;
S6, intercepting the light guide element: intercepting a light guide element of a proper length, the light flux of which varies monotonically during bi-directional bending;
s7, installing a connecting piece: placing two ends of the photoconductive element into the first connecting hole of the first connecting piece 15 and the second connecting hole of the second connecting piece 16 respectively, and rigidly bonding the first connecting piece 15 and the photoconductive element by using a transparent adhesive;
S8, mounting the light emitting assembly 21: placing the light emitting assembly 21 into the first opening with the light emitting element at one end of the light guiding element, the light emitting assembly 21 being rigidly bonded to the first connector 15 using a transparent adhesive;
S9, mounting the light receiving assembly 22: the light receiving member 22 is placed in the second opening with the light receiving element at one end of the light guiding element, and the light receiving member 22 is rigidly bonded to the first connector 15 using a transparent adhesive.
In the step of processing the light escape groove 12, the processing may be performed by a laser engraving process, a chemical etching process, a mechanical processing process, or the like.
In the step of processing the whispering gallery blocking groove 13, the processing may be performed by using a laser engraving process, or a chemical etching process, or a mechanical processing process, in this embodiment, the processing is performed by using a laser engraving process, and the light dissipation groove 12 and the whispering gallery blocking groove 13 use the same processing process, so that the same surface characteristics are easier to obtain, and the light flux of the light guide body 11 is easier to be ensured to change monotonically in the bidirectional bending process.
The manufacturing method achieves the aim of obviously monotonous change of luminous flux along with bending on the basis of ensuring the structural performance of the photoconductive element body. The processing method is simple, so that the process cost is low, and the effects of improving the production efficiency and reducing the cost can be achieved.
This embodiment has the following advantages:
the light source is provided to the light guide member by the light emitting element of the light emitting element 21, and light passes through the light guide member from the light emitting element and irradiates the light receiving element of the light receiving element 22.
The arrows shown in fig. 5, 6 and 7 are the intended light ray injection directions. When the quantity of light emitted by the light emitting element is constant, the luminous flux of the light guiding element is made to correspond to the degree of bending one by the light guiding element having monotonicity by the change of the luminous flux of the light guiding element during the bi-directional bending. The stable light source is provided by the light emitting element, and the light guiding element is bent along with the bending of the measured object, so that the luminous flux of the light guiding element is changed, the light after the change of the luminous flux is received by the light receiving element, and the light receiving element is used for converting the light into a signal, so that the function of detecting the bending degree of the measured object is realized. And because the change of the luminous flux of the light guide element has monotonicity in the bidirectional bending process of the light guide element, the bending direction and the bending angle of the measured object are also in one-to-one correspondence with the bending degree of the light guide element, and then the bending direction and the bending angle of the measured object can be obtained through the received light conversion signals by the light receiving element, so that the bidirectional bending detection effect is realized, the detection effect and the application range are effectively improved, the angle measurement is very convenient, and the measurement precision is higher.
In the embodiment, the driving input of the sensor is a current value, and the light-emitting quantity of the light-emitting element is in direct proportion to the driving current; the light receiving element outputs a current value after receiving the light. Under the condition that the power supply voltage is unchanged, the output current of the light receiving component 22 is in a direct proportion relation with the luminous flux received by the surface, namely, the output current corresponds to the bending degree one by one, so that the bending direction and the bending angle of the measured object can be judged through the magnitude of the current.
The light-emitting quantity of the light-emitting element is in direct proportion to the driving current, so that the light-emitting quantity of the light-emitting element can be controlled by adjusting the driving current input to the light-emitting element, and the effects of improving applicability and facilitating measurement can be achieved.
The light emitting diode provides a light source for the photoconductive element, so that the light emitting diode can emit light by receiving current, and the function of providing the light source for the photoconductive element is realized.
The phototriode receives the light transmitted by the photoconductive element, so that the phototriode can emit current by receiving the light, and the luminous flux of the photoconductive element is converted into current, thereby acquiring the information of the bending direction and angle of the measured object through the current.
The light emitting assembly 21 and the light guiding member are connected by the first connection 15, and the first connection hole communicates with the first opening, so that the light energy emitted from the light emitting assembly 21 is transferred to the light guiding member. The light emitting assembly 21 and the light guiding member are both fixed to the first coupling member 15 by means of a transparent adhesive, while also ensuring the transfer of light energy to the light guiding member.
The light receiving element 22 and the light guiding member are connected by the second connection member 16, and the second connection hole communicates with the second opening, so that the light receiving element 22 receives the light transmitted by the light guiding member. The light receiving element 22 and the light guiding element are both fixed to the second connecting member 16 by means of a transparent adhesive, while also ensuring that the light energy emitted by the light guiding element is transmitted to the light receiving element 22.
Through the arrangement of the light escape groove 12 and the whispering gallery blocking groove 13, the light guide element can influence the geometric model of the light path through the light escape groove 12 or the whispering gallery blocking groove 13 no matter in the direction from the light escape groove 12 to the whispering gallery blocking groove 13 or in the direction from the whispering gallery blocking groove 13 to the light escape groove 12, so that the geometric model of the light path is not matched with the geometric model of the bending loss oscillation phenomenon, and the bending loss oscillation phenomenon of bidirectional bending is eliminated. Therefore, bending the light flux in two different directions of the light guide body 11 causes the light flux to change monotonously because of eliminating the bending loss oscillation phenomenon. The luminous flux also changes monotonically during the bending of the light guide body 11 from the flat state to the single direction, or during the stretching of the light guide body from the bent state to the flat state in the single direction.
As shown in fig. 5, when the light guide body 11 is in a flat state, due to the light escape groove 12 and the whispering gallery blocking groove 13, a part of light with a specific incident angle escapes from the cortex layer through the light escape groove 12 and the whispering gallery blocking groove 13 to be dissipated, so that a part of luminous flux of the light guide body 11 is lost when the light guide body is in a flat state.
As shown in fig. 6, when the light guide body 11 is bent toward one side of the whispering gallery blocking groove 13, the surface of the light escape groove 12 is stretched and gradually tends to be perpendicular to the incident light path, and more light escapes from the light escape groove 12 to the cortex layer for dissipation, so that the luminous flux is reduced; at this time, the surface of the whispering gallery blocking groove 13 is compressed and gradually tends to be parallel to the incident light path, so that the light originally escaping from the cortex of the whispering gallery blocking groove 13 is now retained, and the luminous flux is increased. Since the total surface area of the light escape grooves 12 is larger than the total surface area of the whispering gallery blocking grooves 13, the light flux is monotonously reduced as the light guide body 11 is bent to one side of the whispering gallery blocking grooves 13 because the light escape grooves 12 are the main factor causing the change in the light flux.
As shown in fig. 7, when the light guide body 11 is bent to one side of the light escape groove 12, the inner surface of the light escape groove 12 is gradually compressed and gradually tends to be parallel to the incident light path, at which time the amount of light dissipated from the light escape groove 12 is reduced; while the surface of the whispering gallery blocking groove 13 is stretched and gradually tends to be perpendicular to the incident light path, at which time the amount of light dissipated from the whispering gallery blocking groove 13 increases instead. Since the total surface area of the light escape grooves 12 is larger than the total surface area of the whispering gallery blocking grooves 13, the light flux is monotonously increased as the light guide body 11 is bent to one side of the light escape grooves 12 because the light escape grooves 12 are the main factor causing the change in the light flux.
So that the light flux variation of the light guide body 11 is monotonously varied and continuously varied, regardless of whether the light guide body 11 is bent in the direction of the whispering gallery blocking groove 13 toward the light escape groove 12 or the light escape groove 12 toward the whispering gallery blocking groove 13. Therefore, the photoconductive element can have a better measuring effect when being applied to the sensor for detecting the bidirectional bending degree, and can have wider applicable occasions.
The depths of the light escape grooves 12 and the whispering gallery blocking grooves 13 are each an order of magnitude smaller than the radius of the fiber core, and when the light guide body 11 is bent, the total loss of the light guide member is approximately equivalent to the superposition of the macrobending loss and the microbending loss, so that the change in luminous flux is remarkable as the light guide member is bent.
Example 2:
A novel photoconductive element, as shown in fig. 8, which differs from embodiment 1 in that in a unit length section: the light escape grooves 12 are provided in plural, and the sum of the inner surface areas of the light escape grooves 12 is not less than 4 times the inner surface area of the whispering gallery blocking groove 13.
Within a unit length of: the plurality of light escape grooves 12 are arranged along the extending direction of the light guide body 11.
This embodiment has the following advantages:
through setting up the different light escape groove 12 in a plurality of positions for light guide body 11 can both change luminous flux and eliminate bending loss oscillation phenomenon through light escape groove 12 when the bending of different positions, plays the effect that improves suitability and facilitate the use.
Example 3:
A novel photoconductive element, as shown in fig. 9 and 10, which differs from embodiment 2 in that in a unit length: the light escape grooves 12 are provided in 3, 3 light escape grooves 12 are arranged along the circumferential direction of the light guide body 11.
Within a unit length of: the whispering gallery blocking grooves 13 are provided with 3, the sum of the inner surface areas of the 3 light escape grooves 12 is not less than 4 times the sum of the inner surface areas of the plurality of whispering gallery blocking grooves 13, and the 3 light escape grooves are arranged along the circumferential direction of the light guide body 11.
This embodiment has the following advantages:
Through setting up the different light escape groove 12 of a plurality of positions and whispering gallery blocking groove 13 for light guide body 11 can all change luminous flux and eliminate bending loss oscillation phenomenon through light escape groove 12 when the bending of different positions, play the effect that improves suitability and facilitate the use.
Example 4:
The difference between the novel light guiding element and embodiment 2 is that the light dissipating grooves 12 and the whispering gallery blocking grooves 13 are all arranged along the extending direction of the light guiding element body 11, the number of the light dissipating grooves 12 and the whispering gallery blocking grooves 13 is the same, and the light dissipating grooves 12 and the whispering gallery blocking grooves 13 are arranged in pairs with the light guiding element body 11 as the center.
This embodiment has the following advantages:
Through setting up the different light escape groove 12 of a plurality of positions and whispering gallery blocking groove 13 for light guide body 11 can all change the luminous flux and eliminate bending loss oscillation phenomenon through light escape groove 12 or whispering gallery blocking groove 13 when the position of difference is crooked, play the effect that improves suitability and facilitate the use.
Example 5:
a novel light guide member, as shown in fig. 12, is different from embodiment 1 in that the light guide body 11 has a rectangular overall cross-sectional outer contour.
This embodiment has the following advantages:
The light guide member body 11 with the cross section outline in different shapes is selected, so that the light guide member body 11 is applicable to different application occasions, the applicability is improved, and the effect of convenient use is achieved.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (8)
1. Current type bidirectional bending sensor, its characterized in that: the light guide device comprises a light emitting component (21), a light receiving component (22) and a flexible light guide element, wherein the light guide element has monotonicity in the change of the luminous flux of the light guide element in the bidirectional bending process, the light emitting component (21) and the light receiving component (22) are respectively fixedly arranged at two ends of the light guide element, the light emitting component (21) comprises a light emitting element, the light receiving component (22) comprises a light receiving element, and the light emitting element and the light receiving element are respectively arranged at two ends of the light guide element; the light guide element comprises a light guide body (11), wherein the light guide body (11) is made of a material with a refractive index greater than 1 and flexible, and the light guide body (11) comprises at least 1 unit length section; within the unit length segment: the light guide body (11) is provided with a light ray escape groove (12) and a whispering gallery blocking groove (13), the light ray escape groove (12) and the whispering gallery blocking groove (13) extend along the length direction of the light guide body (11), the depth of the light ray escape groove (12) is smaller than 1/20 of the width of the light guide body (11), the depth of the whispering gallery blocking groove (13) is not larger than the depth of the light ray escape groove (12), the inner surface area of the light ray escape groove (12) is not smaller than 4 times of the inner surface area of the whispering gallery blocking groove (13), and at least 1 cross section center of the light guide body (11) is positioned on a connecting line of the geometric center of the surface of the light ray escape groove (12) and the geometric center of the surface of the whispering gallery blocking groove (13); the light guide member is characterized in that a cladding layer (14) is arranged outside the light guide member body (11), and the surfaces of the light guide member body (11), the light escape groove (12) and the whispering gallery blocking groove (13) are all attached to the inner surface of the cladding layer (14), the outer surface of the cladding layer (14) is a smooth and continuous surface, and the refractive index of the cladding layer (14) is smaller than that of the light guide member body (11).
2. The amperometric bi-directional bend sensor of claim 1, wherein: the light emitting element is an active light emitting device in which the light emission amount is in direct proportion to the driving current.
3. The amperometric bi-directional bend sensor of claim 2, wherein: the light-emitting element is a light-emitting diode.
4. The amperometric bi-directional bend sensor of claim 1, wherein: the light receiving element is an active light flux detection device with output current in direct proportion to light flux received by the surface of the light receiving element under the condition that power supply voltage is unchanged.
5. The amperometric bi-directional bend sensor of claim 4, wherein: the light receiving element is a phototransistor.
6. The amperometric bi-directional bend sensor of claim 1, wherein: the light emitting device is characterized in that a first connecting piece (15) is arranged between the light emitting component (21) and the light guiding element, the first connecting piece (15) is solid, the first connecting piece (15) is provided with a first opening for accommodating the light emitting component (21), the first connecting piece (15) is provided with a first connecting hole for accommodating one end of the light guiding element and penetrating through the first opening, and the first connecting piece (15) is rigidly bonded with the light emitting component (21) and the light guiding element through transparent adhesives.
7. The amperometric bi-directional bend sensor of claim 1, wherein: the light receiving component (22) and the light guiding element are provided with a second connecting piece (16), the second connecting piece (16) is solid, the second connecting piece (16) is provided with a second opening for accommodating the light receiving component (22), the second connecting piece (16) is provided with a second connecting hole for accommodating one end of the light guiding element and penetrating through the second opening, and the second connecting piece (16) is rigidly bonded with the light receiving component (22) and the light guiding element through transparent adhesives.
8. The method for manufacturing a current-type bi-directional bending sensor according to any one of claims 1 to 7, wherein: the method comprises the following steps:
Intercepting the photoconductive element: intercepting a suitable length of said light-guiding element having monotonicity in its luminous flux variation during bi-directional bending; the step of intercepting the light guide element may further comprise the steps of: processing the light guide body (11): intercepting a proper length of material with the refractive index larger than 1 as an emergent light guide body (11); machining a light escape groove (12): processing a light ray escape groove (12) on the outer surface of the light guide body (11), and enabling the light ray escape groove (12) to extend along the length direction of the light guide body (11), wherein the depth of the light ray escape groove (12) is smaller than 1/20 of the width of the light guide body (11); processing echo wall blocking grooves (13): processing a whispering gallery blocking groove (13) on the outer surface of the light guide body (11), and enabling the whispering gallery blocking groove (13) to extend along the length direction of the light guide body (11), wherein the depth of the whispering gallery blocking groove (13) is not more than that of a light ray escape groove (12), the inner surface area of the light ray escape groove (12) is not less than 4 times of the inner surface area of the whispering gallery blocking groove (13), and at least 1 cross section center of the light guide body (11) is positioned on a connecting line of the geometric center of the surface of the light ray escape groove (12) and the geometric center of the surface of the whispering gallery blocking groove (13); machining the cladding (14): manufacturing a cladding layer (14) which is attached to the outer surfaces of the light guide body (11), the light escape groove (12) and the whispering gallery blocking groove (13) on the outer surface of the light guide body (11) by using a spraying or coating process, wherein the refractive index of the cladding layer (14) is smaller than that of the light guide body (11); surface treatment of the cladding (14): extruding, shaping, cutting, condensing or solidifying the cladding (14) and flattening and continuously enabling the outer surface of the cladding (14);
And (3) installing a connecting piece: placing two ends of the light guide element into a first connecting hole of a first connecting piece (15) and a second connecting hole of a second connecting piece (16) respectively, wherein the first connecting piece (15) and the light guide element are rigidly bonded by using a transparent adhesive;
Mounting a light emitting assembly (21): -placing the light emitting assembly (21) in the first opening with the light emitting element at one end of the light guiding element, the light emitting assembly (21) being rigidly bonded to the first connector (15) using a transparent adhesive;
Mounting a light receiving assembly (22): the light receiving assembly (22) is placed in the second opening with the light receiving element at one end of the light guiding element, the light receiving assembly (22) being rigidly bonded to the first connector (15) using a transparent adhesive.
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