CN106767486A - A kind of fiber grating two-dimensional strain sensitization sensor and its method for packing - Google Patents
A kind of fiber grating two-dimensional strain sensitization sensor and its method for packing Download PDFInfo
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- CN106767486A CN106767486A CN201710114242.7A CN201710114242A CN106767486A CN 106767486 A CN106767486 A CN 106767486A CN 201710114242 A CN201710114242 A CN 201710114242A CN 106767486 A CN106767486 A CN 106767486A
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- fiber grating
- dimensional strain
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- enhanced sensitivity
- sensitivity substrate
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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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
Abstract
The present invention relates to a kind of fiber grating two-dimensional strain sensitization sensor and its method for packing, including Two-dimensional strain enhanced sensitivity substrate and two fiber gratings, two fiber gratings are arranged in a mutually vertical manner in Two-dimensional strain enhanced sensitivity substrate center, and two fiber gratings are respectively No. I fiber grating and No. II fiber grating；Two-dimensional strain enhanced sensitivity substrate includes four fixed plates and annulus, four fixed plates are circumferentially uniformly distributed in annulus surrounding, two fixed plates and No. I fiber grating are distributed along the horizontal center line of annulus, two other fixed plate and No. II fiber grating are distributed along the vertical center line of annulus, No. I two ends of fiber grating are connected with two fixed plates on the horizontal center line of annulus and annulus, and No. II two ends of fiber grating are connected with two fixed plates on the vertical center line of annulus and annulus.Simple structure, it is easy for installation, there is reliability higher, it is easy to use repeatly, the strain of two vertical direction can be simultaneously measured, there is effect of enhanced sensitivity higher in both direction.
Description
Technical field
The present invention relates to Fiber Bragg Grating technology field, and in particular to a kind of fiber grating two-dimensional strain sensitization sensor and its
Method for packing.
Background technology
In the fields such as heavy mining machinery, large-scale engineering machinery, heavy machine tool, because working load is big, operation continuity
By force, the factor such as site environment is severe to the health status of plant equipment large-sized structural parts, it is necessary to be monitored, and strain as one
Monitoring means is planted usually to be used.The status monitoring of current plant equipment mainly uses electromagnetism class sensor, such sensing utensil
Have that measuring point is single, anti-electromagnetic interference capability is weak, can not carry out the limitation such as strain sensitization.
And real-time monitoring is carried out to plant equipment using optical fiber sensing technology, it is high with explosion-proof, electromagnetism interference, high temperature resistant
Press, distributed measurement can be carried out, the incomparable advantage of the electromagnetism class sensor such as enhanced sensitivity can be carried out to strain.
However, the deformation very little of large-sized structural parts, fiber grating is directly adhered to large-scale knot by the strain of generation also very little
On component measure sensitivity it is not high, and large-sized structural parts surface strain be not single direction but both direction simultaneously
Effect.Understand that the strain measurement sensitivity of bare optical fibers and bare optical gratings is 1.2 μ ε/pm according to fiber grating strain transfer principle, it is impossible to full
Measurement demand of the foot to large-sized structural parts small strain.A kind of fiber grating proposed in patent No. CN201410160233.8 is poor
Dynamic strain piece, eliminates influence of the temperature to strain measurement, does not suggest that the side that enhanced sensitivity and measurement Two-dimensional strain are carried out to strain
Method.Therefore, strain sensitization can be carried out in the urgent need to proposing one kind, the Two-dimensional strain of two vertical direction strain can be simultaneously measured again
Sensitizing sensor.
The content of the invention
The technical problem to be solved in the present invention is, in view of the foregoing defects the prior art has, there is provided a kind of optical fiber light
Grid Two-dimensional strain sensitizing sensor and its method for packing, simple structure, low cost of manufacture are easy for installation, with strain higher
Enhanced sensitivity coefficient, there is uniformity and reliability higher, is easy to use repeatly, can simultaneously measure the strain of two vertical direction, and
And have identical effect of enhanced sensitivity in both direction.
The present invention is for the solution technical scheme that is used of above-mentioned technical problem：
A kind of fiber grating two-dimensional strain sensitization sensor, including a Two-dimensional strain enhanced sensitivity substrate and two optical fiber light
Grid, two fiber gratings are arranged in a mutually vertical manner in Two-dimensional strain enhanced sensitivity substrate center, and two fiber gratings are respectively No. I optical fiber light
Grid and No. II fiber grating；
Wherein, Two-dimensional strain enhanced sensitivity substrate includes four fixed plates and annulus, and four fixed plates are circumferentially uniformly distributed in
Annulus surrounding, four fixed plates are respectively left fixed plate, right fixed plate, upper mounted plate and bottom plate, No. I fiber grating, a left side
Fixed plate and right fixed plate are distributed on the horizontal center line of annulus, No. II fiber grating, upper mounted plate and bottom plate distribution
In on the vertical center line of annulus, the two ends of two fiber gratings are both secured on annulus, while No. I two ends of fiber grating point
It is not connected with left fixed plate and right fixed plate, No. II two ends of fiber grating are connected with upper mounted plate and bottom plate respectively, two
Grid region in the middle part of individual fiber grating is suspended in the ring of annulus.
According to above-mentioned technical proposal, fixed plate includes linking arm and installing plate, and installing plate is connected by linking arm with annulus.
According to above-mentioned technical proposal, fiber grating is connected by bonding agent or welding compound with Two-dimensional strain enhanced sensitivity substrate.
According to above-mentioned technical proposal, described bonding agent is organic glue, and welding compound is glass.
According to above-mentioned technical proposal, annulus is provided with two semicircle strias, and two semicircle strias are distributed in the level of annulus
On center line, the two ends of No. I fiber grating are respectively placed in two semicircle strias.
According to above-mentioned technical proposal, the fiber grating for being fixed on Two-dimensional strain enhanced sensitivity substrate is provided with certain prestressing force.
According to above-mentioned technical proposal, the prestress application on fiber grating is in the grid region two ends of fiber grating.
According to above-mentioned technical proposal, No. I fiber grating and No. II fiber grating being fixed on Two-dimensional strain enhanced sensitivity substrate
Do not contact with each other.
A kind of method for packing of fiber grating two-dimensional strain sensitization sensor, comprises the following steps：
1) Two-dimensional strain enhanced sensitivity substrate is fixed on level packages platform；
2) certain pretightning force is applied at No. I fiber grating two ends, by No. I one end of fiber grating and Two-dimensional strain enhanced sensitivity
Annulus and left fixed plate in substrate are connected, by the circle in No. I other end of fiber grating and Two-dimensional strain enhanced sensitivity substrate
Ring and right fixed plate are connected；
3) after No. I fiber grating is completely fixed on Two-dimensional strain enhanced sensitivity substrate, by Two-dimensional strain enhanced sensitivity substrate from
Pulled down on level packages platform, be fixed in again on level packages platform after 90 degree of rotate counterclockwise；
4) apply certain pretightning force at No. II fiber grating two ends, No. II one end of fiber grating and Two-dimensional strain are increased
Annulus and upper mounted plate in quick substrate are connected, by No. II other end of fiber grating and Two-dimensional strain enhanced sensitivity substrate
Annulus and bottom plate are connected.
The invention has the advantages that：
1st, simple structure of the present invention, low cost of manufacture is easy for installation, with strain sensitization coefficient higher, there is higher
Uniformity and reliability, are easy to use repeatly, fiber grating two-dimensional strain sensitization sensor of the invention to pass through Two-dimensional strain
Enhanced sensitivity substrate and the diesis structure of two fiber grating formation can simultaneously measure the strain of two vertical direction, and two sides
To there is identical effect of enhanced sensitivity, the enhanced sensitivity multiple of both direction can reach 5 times of bare optical fibers and bare optical gratings.
2nd, Two-dimensional strain enhanced sensitivity substrate can be by adjusting the multiple of the length of linking arm, width adjusting strain sensitization.
Brief description of the drawings
Fig. 1 is the front view of fiber grating two-dimensional strain sensitization sensor in the embodiment of the present invention；
Fig. 2 is the front view of Two-dimensional strain enhanced sensitivity substrate in the embodiment of the present invention；
Fig. 3 is the simplified model figure of Two-dimensional strain enhanced sensitivity substrate in the embodiment of the present invention；
Fig. 4 is the elevation of fiber grating two-dimensional strain sensitization sensor in the embodiment of the present invention；
In figure, 1- fiber gratings, No. I fiber grating of 1-1-, No. II fiber grating of 1-2-, 2- Two-dimensional strain enhanced sensitivity substrates,
The installing plates of 2-1- first, the installing plates of 2-2- second, the installing plates of 2-3- the 3rd, the installing plates of 2-4- the 4th, the left linking arms of 2-5-, 2-6-
Right linking arm, the upper linking arms of 2-7-, linking arm under 2-8-, 2-9- annulus, 2-10- semicircle strias, 3- bonding agents or welding compound.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
Shown in 1~Fig. 4 of reference picture, the fiber grating two-dimensional strain sensitization sensing in one embodiment that the present invention is provided
Device, including a Two-dimensional strain enhanced sensitivity substrate 2 and two fiber gratings 1, two fiber gratings 1 are arranged in a mutually vertical manner answers in two dimension
Become the center of enhanced sensitivity substrate 2, two fiber gratings 1 are respectively No. I fiber grating 1-1 and No. II fiber grating 1-2；
Wherein, Two-dimensional strain enhanced sensitivity substrate 2 includes four fixed plates and annulus 2-9, and four fixed plates are circumferentially uniformly divided
Annulus 2-9 surroundings are distributed in, four fixed plates are respectively left fixed plate, right fixed plate, upper mounted plate and bottom plate, No. I optical fiber
Grating 1-1, left fixed plate and right fixed plate are distributed on the horizontal center line of annulus 2-9, No. II fiber grating 1-2, upper fixation
Plate and bottom plate are distributed on the vertical center line of annulus 2-9, No. I one end of fiber grating 1-1 and annulus 2-9 and left fixation
Plate is connected, and No. I other end of fiber grating 1-1 be connected with annulus 2-9 and right fixed plate, No. II one end of fiber grating 1-2 and
Annulus 2-9 and upper mounted plate are connected, and No. II other end of fiber grating 1-2 is connected with annulus 2-9 with bottom plate, two optical fiber
Grid region in the middle part of grating is suspended in the ring of annulus 2-9.
Further, left fixed plate includes left linking arm 2-5 and the first installing plate 2-1, and right fixed plate includes right linking arm
2-6 and the second installing plate 2-2, upper mounted plate includes upper linking arm 2-7 and the 3rd installing plate 2-3, and bottom plate includes lower connection
Arm 2-8 and the 4th installing plate 2-4.
Further, fixed plate includes linking arm and installing plate, and installing plate is connected by linking arm with annulus 2-9.
Further, described Two-dimensional strain enhanced sensitivity substrate is an entirety, can be made by linear cutter one-shot forming
Make process is simple, low cost.
Further, described linking arm is flexible linking arm, by adjusting four length of linking arm, width up and down
The radius of degree and regulation annulus 2-9, width, thickness change the multiple of strain sensitization.
Further, fiber grating is connected by bonding agent or welding compound 3 with Two-dimensional strain enhanced sensitivity substrate 2.
Further, described bonding agent is organic glue, and welding compound is glass.
Further, fiber grating is be bonded with Two-dimensional strain enhanced sensitivity substrate 2 by organic glue, or fiber grating passes through glass
Glass is welded with Two-dimensional strain enhanced sensitivity substrate 2.
Further, annulus 2-9 is provided with two semicircle strias 2-10, two semicircle stria 2-10 and is distributed in annulus 2-9
Horizontal center line on, the two ends of No. I fiber grating 1-1 are respectively placed in two semicircle stria 2-10.
Further, the grid region of two fiber gratings is arranged at the middle part of fiber grating, is suspended in the ring of annulus 2-9.
Further, the fiber grating for being fixed on Two-dimensional strain enhanced sensitivity substrate 2 is provided with certain prestressing force, fiber grating
, it is necessary to apply certain prestressing force before being fixed on Two-dimensional strain enhanced sensitivity substrate 2, to ensure Two-dimensional strain enhanced sensitivity substrate 2 in quilt
Two-dimensional strain sensitizing sensor can still be surveyed during compression.
Further, the prestress application on fiber grating is in the grid region two ends of fiber grating.
Further, No. I fiber grating 1-1 being fixed on Two-dimensional strain enhanced sensitivity substrate 2 and No. II fiber grating 1-2 are simultaneously
Do not contact with each other.
A kind of method for packing of fiber grating two-dimensional strain sensitization sensor, comprises the following steps：
1) Two-dimensional strain enhanced sensitivity substrate 2 is fixed on level packages platform；
2) certain pretightning force is applied at No. I fiber grating 1-1 two ends, by No. I one end of fiber grating 1-1 by bonding
Annulus 2-9 and left fixed plate in agent or welding compound 3 and Two-dimensional strain enhanced sensitivity substrate 2 are connected, by No. I fiber grating 1-1
The other end be connected by the annulus 2-9 and right fixed plate in bonding agent or welding compound 3 and Two-dimensional strain enhanced sensitivity substrate 2；
3) after No. I fiber grating 1-1 is completely fixed on Two-dimensional strain enhanced sensitivity substrate 2, by Two-dimensional strain enhanced sensitivity base
Piece 2 is pulled down from level packages platform, is fixed in again on level packages platform after 90 degree of rotate counterclockwise；
4) certain pretightning force is applied at No. II fiber grating 1-2 two ends, by No. II one end of fiber grating 1-2 by viscous
The annulus 2-9 and upper mounted plate connect in agent or welding compound 3 and Two-dimensional strain enhanced sensitivity substrate 2 are connected, by No. II fiber grating
The other end of 1-2 is connected solid with annulus 2-9 and bottom plate in Two-dimensional strain enhanced sensitivity substrate 2 by bonding agent or welding compound 3
It is fixed.
In one embodiment of the present of invention, described fiber grating two-dimensional strain sensitization sensor includes：Fiber grating 1,
Two-dimensional strain enhanced sensitivity substrate 2 and bonding agent or welding compound 3, the structure of Two-dimensional strain enhanced sensitivity substrate 2 include four up and down peaces
(four installing plates are respectively the first installing plate 2-1, the second installing plate 2-2, the 3rd installing plate 2-3, the 4th installing plate 2- to dress plate
4), (four linking arms are respectively left linking arm 2-5, right linking arm 2-6, upper linking arm 2-7, lower linking arm 2- to four linking arms
8) on, annulus 2-9, and annulus 2-9 and left linking arm 2-5 and right linking arm 2-6 place-centric lines carve for placing optical fiber
The semicircle stria 2-10 of grating；Four four coupled linking arms of installing plate are arranged vertically, and are circumferentially symmetrically distributed on
Around annulus 2-9, semicircle stria 2- is carved with the center line of left linking arm 2-5 and the coupled annulus 2-9 of right linking arm 2-6
10, semicircle stria 2-10 are used to place No. I fiber grating 1-1, it is ensured that the grid region of No. I fiber grating 1-1 is suspended on annulus 2-9's
In ring, certain were applied to No. I fiber grating 1-1 grid region two ends by certain method before being fixed to No. I fiber grating 1-1
Pretightning force, organic glue be bonded or glass solder by way of will apply No. I fiber grating 1-1 of pretightning force and fixed
On annulus 2-9；Upper linking arm 2-7 and No. II optical fiber light of placement on the center line of lower linking arm 2-8 and its annulus 2-9 being connected
Grid 1-2, it is ensured that the grid region of No. II fiber grating 1-2 is suspended in annulus 2-9 rings, before being fixed to No. II fiber grating 1-2
Certain pretightning force is applied to the grid region two ends of No. II fiber grating 1-2 by certain method, be bonded by organic glue or
No. II fiber grating 1-2 that the mode of person's glass solder will apply pretightning force is fixed on annulus 2-9, left linking arm 2-5 and
Right linking arm 2-6 be connected thereto annulus 2-9 position of center line have semicircle stria 2-10, upper linking arm 2-7 and lower linking arm 2-8 with
Without stria on its connection annulus 2-9 place-centric line, it is ensured that No. I fiber grating 1-1 and No. II fiber grating 1-2 are fixed on circle
Do not contacted with each other when on ring 2-9.
Further, by left installing plate 2-1, right installing plate 2-2 or upper mounting plate 2-3, the change between lower installation board 2-4
Shape is focused in No. I fiber grating 1-1 or No. II hanging section of fiber grating 1-2, is increased so as to strain amplification is reached into strain
Quick purpose.
Further, described upper mounting plate, lower installation board, left installing plate and right installing plate, upper linking arm 2-7, lower company
Arm 2-8, left linking arm 2-5 and right linking arm 2-6 and annulus 2-9 are met for an overall structure；
Further, Two-dimensional strain enhanced sensitivity substrate 2 has coupling to the strain measurement of both direction in structure, can lead to
The mode for crossing theoretical calculation or static demarcating is decoupled to it.
The method for packing of above-mentioned fiber grating two-dimensional strain sensitization sensor, comprises the following steps that：
1. Two-dimensional strain enhanced sensitivity substrate 2 is fixed on level packages platform, No. I fiber grating 1-1 is placed on left connection
In half slot on arm 2-5, right linking arm 2-6 and its connected annulus 2-9, it is ensured that the grid region of No. I fiber grating 1-1 is suspended on circle
In the ring of ring 2-9, certain pretightning force is applied at No. I fiber grating 1-1 two ends.
2. organic glue be bonded or glass solder by way of by No. I fiber grating 1-1 be fixed on Two-dimensional strain increase
On quick substrate 2.
3. after No. I fiber grating 1-1 is completely fixed on Two-dimensional strain enhanced sensitivity substrate 2, by Two-dimensional strain enhanced sensitivity base
Piece 2 is pulled down from level packages platform, is fixed in again on level packages platform after 90 degree of rotate counterclockwise, by No. II fiber grating
1-2 be placed on linking arm 2-7 with lower linking arm 2-8 and its annulus 2-9 being connected, it is ensured that No. II fiber grating 1-2 grid region
It is suspended in annulus 2-9 rings, certain pretightning force is applied at No. II fiber grating 1-2 two ends.
4. organic glue be bonded or glass solder by way of by No. II fiber grating 1-2 be fixed on Two-dimensional strain increase
On quick substrate 2.
The operation principle of the fiber grating two-dimensional strain sensitization sensor is as follows：
Deformation between left and right installation board or upper lower installation board is focused on into No. I fiber grating 1-1 or No. II optical fiber
In the hanging section of grating 1-2, so as to strain be amplified.When between left and right installation board horizontal direction there occurs 2 Δ l deformation and it is upper and lower
When not deformed between installing plate, the deformation of horizontal direction drives left linking arm 2-5 and right linking arm 2-6 to produce Δ l1's
Deformation, it is assumed that the length of linking arm is l1, annulus 2-9 radiuses are r, and thickness is h1, can be strained according to material mechanics principle
Enhanced sensitivity multiple is：
Only presently preferred embodiments of the present invention above, can not limit the interest field of the present invention with this certainly,
Therefore the equivalence changes made according to scope of the present invention patent, still belong to protection scope of the present invention.
Claims (10)
1. a kind of fiber grating two-dimensional strain sensitization sensor, it is characterised in that including a Two-dimensional strain enhanced sensitivity substrate and two
Individual fiber grating, two fiber gratings are arranged in a mutually vertical manner in Two-dimensional strain enhanced sensitivity substrate center, and two fiber gratings are respectively I
Number fiber grating and No. II fiber grating；
Wherein, Two-dimensional strain enhanced sensitivity substrate includes four fixed plates and annulus, and four fixed plates are circumferentially uniformly distributed in annulus
Surrounding, four fixed plates are respectively left fixed plate, right fixed plate, upper mounted plate and bottom plate, No. I fiber grating, left fixation
Plate and right fixed plate are distributed on the horizontal center line of annulus, and No. II fiber grating, upper mounted plate and bottom plate are distributed in circle
On the vertical center line of ring, the two ends of two fiber gratings are both secured on annulus, at the same No. I two ends of fiber grating respectively with
Left fixed plate and right fixed plate are connected, and No. II two ends of fiber grating are connected with upper mounted plate and bottom plate respectively, two light
Grid region in the middle part of fine grating is suspended in the ring of annulus.
2. fiber grating two-dimensional strain sensitization sensor according to claim 1, it is characterised in that fixed plate includes connection
Arm and installing plate, installing plate are connected by linking arm with annulus.
3. fiber grating two-dimensional strain sensitization sensor according to claim 2, it is characterised in that described linking arm is
Flexible linking arm.
4. fiber grating two-dimensional strain sensitization sensor according to claim 1, it is characterised in that fiber grating is by viscous
Agent or welding compound is connect to be connected with Two-dimensional strain enhanced sensitivity substrate.
5. fiber grating two-dimensional strain sensitization sensor according to claim 1, it is characterised in that described Two-dimensional strain
Enhanced sensitivity substrate is an entirety.
6. fiber grating two-dimensional strain sensitization sensor according to claim 1, it is characterised in that annulus is provided with two
Semicircle stria, two semicircle strias are distributed on the horizontal center line of annulus, and the two ends of No. I fiber grating are respectively placed in two
In semicircle stria.
7. fiber grating two-dimensional strain sensitization sensor according to claim 1, it is characterised in that be fixed on Two-dimensional strain
The fiber grating of enhanced sensitivity substrate is provided with certain prestressing force.
8. fiber grating two-dimensional strain sensitization sensor according to claim 7, it is characterised in that pre- on fiber grating
Stress puts on the grid region two ends of fiber grating.
9. fiber grating two-dimensional strain sensitization sensor according to claim 1, it is characterised in that No. I fiber grating with
No. II fiber grating is not contacted with each other.
10. a kind of method for packing of the fiber grating two-dimensional strain sensitization sensor described in claim 1, it is characterised in that bag
Include following steps：
1) Two-dimensional strain enhanced sensitivity substrate is fixed on level packages platform；
2) certain pretightning force is applied at No. I fiber grating two ends, by No. I one end of fiber grating and Two-dimensional strain enhanced sensitivity substrate
In annulus and left fixed plate be connected, by the annulus in No. I other end of fiber grating and Two-dimensional strain enhanced sensitivity substrate and
Right fixed plate is connected；
3) after No. I fiber grating is completely fixed on Two-dimensional strain enhanced sensitivity substrate, by Two-dimensional strain enhanced sensitivity substrate from level
Pulled down on encapsulating table, be fixed in again on level packages platform after 90 degree of rotate counterclockwise；
4) certain pretightning force is applied at No. II fiber grating two ends, by No. II one end of fiber grating and Two-dimensional strain enhanced sensitivity base
Annulus and upper mounted plate in piece are connected, by the annulus in No. II other end of fiber grating and Two-dimensional strain enhanced sensitivity substrate
It is connected with bottom plate.
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| CN107351102A (en) * | 2017-09-13 | 2017-11-17 | 武汉科技大学 | Fiber grating force-touch sensor, robot and its manipulator finger tip |
| CN109631811A (en) * | 2019-01-07 | 2019-04-16 | 新疆交通建设集团股份有限公司 | Vibrating string type strain transducer and preparation method thereof |
| CN109780988A (en) * | 2019-01-04 | 2019-05-21 | 大连理工大学 | The star-like cantilevered strain multiplier and design method that the strain of Multi-axial Loading machinery part surface is amplified in real time |
| CN110530282A (en) * | 2019-09-04 | 2019-12-03 | 苏州热工研究院有限公司 | Three spindle-type fiber grating strain measurement sensors of adjustable sensitivity |
| CN112833809A (en) * | 2021-01-13 | 2021-05-25 | 苏州热工研究院有限公司 | Fiber grating high-temperature strain gauge and calibration method thereof |
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| CN110530282A (en) * | 2019-09-04 | 2019-12-03 | 苏州热工研究院有限公司 | Three spindle-type fiber grating strain measurement sensors of adjustable sensitivity |
| CN112833809A (en) * | 2021-01-13 | 2021-05-25 | 苏州热工研究院有限公司 | Fiber grating high-temperature strain gauge and calibration method thereof |
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| WO2022151798A1 (en) * | 2021-01-13 | 2022-07-21 | 苏州热工研究院有限公司 | Optical fiber grating high-temperature strain sensor and calibration method thereof |
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Application publication date: 20170531 |