CN210166233U - Rigid material Young modulus measuring device based on fiber grating sensor - Google Patents
Rigid material Young modulus measuring device based on fiber grating sensor Download PDFInfo
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- CN210166233U CN210166233U CN201921123276.3U CN201921123276U CN210166233U CN 210166233 U CN210166233 U CN 210166233U CN 201921123276 U CN201921123276 U CN 201921123276U CN 210166233 U CN210166233 U CN 210166233U
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Abstract
A rigid material Young modulus measuring device based on a fiber grating sensor relates to a Young modulus measuring technology and aims to solve the problems that an existing Young modulus measuring method is poor in stability and low in measuring accuracy. The novel bottom plate is arranged on a horizontal plane; the support is fixed on the bottom plate; the support post penetrates through the partition plate and then is fixed on the top plate, so that the top plate, the bottom plate and the partition plate are parallel to each other, and the partition plate moves between the top plate and the bottom plate; the spring is arranged on the strut between the partition plate and the top plate; the pressurizing device is arranged on the bottom plate; the pressure sensor is fixed on the partition plate, and the rigid material to be measured is placed on the pressure sensor; the fiber bragg grating is solidified on the side surface of the rigid material to be measured, the fiber bragg grating is connected with a fiber bragg grating wavelength demodulator, and the fiber bragg grating wavelength demodulator is connected with a computer; the pressure sensor is connected with a multimeter. The method has the advantages of good stability and high measurement precision.
Description
Technical Field
The utility model relates to a young's modulus measurement technique.
Background
Young's modulus is an important physical quantity describing the ability of a solid material to resist deformation; the larger the Young's modulus is, the less likely deformation is to occur; young's modulus is often used as one of the criteria for selecting materials for designing mechanical components, and is a common reference parameter in the field of engineering design; the measurement of Young's modulus has great research significance on material mechanics.
The principle of measuring young's modulus is based on hooke's law, i.e. the ratio of stress to strain. The existing measuring method comprises the following steps: the stretching method and the beam microbending method, and hall position sensor measurement method, CCD imaging system measurement method, inductive displacement measurement method, and fiber displacement sensor measurement method have been proposed, and the above methods can be roughly classified into two categories: static and dynamic methods; the static method is that constant forces with different magnitudes are applied on the material to deform the material, the magnitude of the generated stress is measured and calculated, and the magnitude of the Young modulus of the material is obtained through the relationship between the stress and the strain; the dynamic method is based on the relationship between the intrinsic parameters of the material and the Young's modulus. The Young modulus is further solved by measuring the inherent parameters; in practical application, however, the methods have the defects of poor stability, low precision, narrow application range, difficulty in meeting the requirements of theoretical principles under experimental conditions and the like; therefore, it is necessary to study a young's modulus measuring apparatus having simplicity, high accuracy, good stability, and strong universality.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the stability of the existing Young modulus measuring method is poor and the measuring precision is low, and providing a rigid material Young modulus measuring device based on a fiber grating sensor.
The utility model discloses a rigid material Young modulus measuring device based on fiber grating sensor, which comprises a fiber grating strain sensor, a pressure sensor, a fiber grating, a pressurizing device, a fiber grating wavelength demodulator, a universal meter, a metal frame, a clapboard and a spring;
the metal frame comprises a top plate, a support post and a bottom plate;
the bottom plate is arranged on a horizontal plane; the support columns are vertically arranged, and the bottom ends of the support columns are fixed on the bottom plate; the top end of the strut penetrates through the partition plate and then is fixed on the lower surface of the top plate, so that the top plate, the bottom plate and the partition plate are parallel to each other, and the partition plate can move up and down along the strut between the top plate and the bottom plate;
the spring is vertically arranged on the strut between the partition plate and the top plate;
the base of the pressurizing device is vertically arranged on the bottom plate, and the pressurizing force application end of the pressurizing device is supported on the lower surface of the partition plate;
the pressure sensor is fixed on the upper surface of the partition plate, and the rigid material to be measured is placed on the upper surface of the pressure sensor;
the fiber bragg grating is arranged on the side surface of the rigid material to be measured;
the fiber bragg grating strain sensor is solidified on the rigid material to be measured at the fiber bragg grating, and the sensing signal output end of the fiber bragg grating strain sensor is connected with the sensing signal input end of the fiber bragg grating wavelength demodulator;
the demodulation signal output end of the fiber grating wavelength demodulator is connected with the demodulation signal input end of the computer;
and the pressure signal output end of the pressure sensor is connected with the pressure signal input end of the multimeter.
A rigid material young modulus measuring device's measurement method based on fiber grating sensor do: firstly, fixing the fiber bragg grating strain sensor resin on the surface of a rigid material to be measured; thirdly, connecting a sensing signal output end of the fiber bragg grating strain sensor with a sensing signal input end of a fiber bragg grating wavelength demodulator, connecting a demodulation signal output end of the fiber bragg grating wavelength demodulator with a demodulation signal input end of a computer, and connecting a pressure signal output end of the pressure sensor with a pressure signal input end of a multimeter; and finally, pressing the partition plate through a pressing force application end of the pressing device to ensure that the top plate and the partition plate extrude the rigid material to be tested, acquiring a pressure value by using a universal meter, and acquiring the fiber grating center wavelength drift amount by using a fiber grating wavelength demodulator and a computer.
The specific working principle is as follows: applying a vertical upward force to the pressure sensor and the rigid material to be measured through the pressurizing device, after the top end of the rigid material to be measured is contacted with the top plate, continuously pressurizing the partition plate through the pressurizing force application end of the pressurizing device, so that the cured fiber bragg grating and the rigid material to be measured cooperatively deform in the vertical direction, converting the force loaded on the rigid material to be measured into an electric signal through the pressure sensor, and measuring the numerical value of the pressure sensor through a universal meter; the rigid material to be measured and the fiber bragg grating generate cooperative deformation in the vertical direction, and the fiber bragg grating central wavelength drift amount is read through a fiber bragg grating wavelength demodulator, so that the tiny deformation amount of the rigid material to be measured can be measured; and calculating the Young modulus of the rigid material to be measured by combining the central wavelength drift amount and the pressure value of the fiber bragg grating.
In the experiment of measuring the Young modulus, the rigid material to be measured generally generates micro deformation, the fiber grating sensor has high sensitivity and strong anti-interference capability, the fiber grating is solidified on the rigid material to be measured, and the fiber grating is deformed in a vertical direction along with the rigid material to be measured, so that a more accurate measurement result can be obtained; the method has the advantages of good stability and high measurement precision.
Drawings
Fig. 1 is a schematic structural diagram of a rigid material young's modulus measuring device based on a fiber grating sensor according to a first embodiment;
fig. 2 is a schematic diagram of the position structure of the rigid material to be measured and the fiber grating.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 and fig. 2, and the rigid material young's modulus measuring device based on the fiber grating sensor according to the present embodiment includes a fiber grating strain sensor 5-1, a pressure sensor 4, a fiber grating 5, a pressurizing device 6, a fiber grating wavelength demodulator 8, a multimeter 9, a metal frame 10, a spacer 2 and a spring 3;
the metal frame 10 comprises a top plate 10-1, a support post 10-2 and a bottom plate 10-3;
the bottom plate 10-3 is arranged on a horizontal plane; the supporting columns 10-2 are vertically arranged, and the bottom ends of the supporting columns 10-2 are fixed on the bottom plate 10-3; the top end of the pillar 10-2 penetrates through the partition plate 2 and then is fixed on the lower surface of the top plate 10-1, so that the top plate 10-1, the bottom plate 10-3 and the partition plate 2 are parallel to each other, and the partition plate 2 can move up and down along the pillar 10-2 between the top plate 10-1 and the bottom plate 10-3; meanwhile, a limiting mechanism is arranged on the support post 10-2 to prevent the partition board 2 from contacting with the bottom board 10-3;
the spring 3 is vertically arranged on the strut 10-2 between the clapboard 2 and the top plate 10-1; the spring 3 is used for ensuring that the partition plate 2 can vertically and stably move upwards after the force application end of the pressurizing device 6 applies force to the partition plate 2;
the base of the pressurizing device 6 is vertically arranged on the bottom plate 10-3, and the pressurizing force application end of the pressurizing device is supported on the lower surface of the clapboard 2;
the pressure sensor 4 is fixed on the upper surface of the partition board 2, and the rigid material 1 to be measured is placed on the upper surface of the pressure sensor 4;
the fiber bragg grating 5 is arranged on the side surface of the rigid material 1 to be measured, and the fiber bragg grating and the rigid material are deformed in a cooperative mode in the vertical direction;
the fiber bragg grating strain sensor 5-1 is solidified on the rigid material 1 to be measured at the position of the fiber bragg grating 5, and the sensing signal output end of the fiber bragg grating strain sensor 5-1 is connected with the sensing signal input end of the fiber bragg grating wavelength demodulator 8; the specific fiber bragg grating strain sensor is arranged on the rigid material 1 to be measured at one grid region of the fiber bragg grating 5;
the demodulation signal output end of the fiber grating wavelength demodulator 8 is connected with the demodulation signal input end of the computer 7;
the pressure signal output end of the pressure sensor 4 is connected with the pressure signal input end of the multimeter 9.
In the present embodiment, the calculation formula of the young's modulus measuring device for the rigid material 1 to be measured is: the fiber bragg grating strain sensor 5-1 has central wavelength drift due to the deformation of the rigid material 1 to be measured, and the formula is
ΔλB＝λB(1-Pe)ε＝kλBε (1)
Wherein k is the stress sensitivity coefficient of the fiber grating strain sensor,
is the strain value of the rigid material 1 to be measured, L is the initial height value of the rigid material 1 to be measured, Delta L is the reduced height value of the rigid material 1 to be measured after being stressed, and lambdaBThe central wavelength of the fiber bragg grating strain sensor 5-1; p is a radical ofeThe elastic-optical coefficient of the fiber bragg grating strain sensor 5-1;
the relation among the pressure P, the strain value epsilon and the elastic modulus E of the section of the rigid material 1 to be measured is
The pressure intensity P of the cross section, the self cross section S and the force F measured by the pressure sensor 4 are related
The relationship between the force F, Young's modulus E and strain ε can be obtained by combining (2) and (3)
F＝E·S·ε (4)
Bringing formula (1) into the above formula to obtain
The above formula is fitted to obtain: applied pressure F and fiber grating strain transmissionDrift delta lambda of sensor 5-1 center wavelengthBThe linear relation is formed, and the Young modulus measurement formula of the rigid material 1 to be measured can be obtained by the slope K of the linear relation
In the present embodiment, the pressurizing device 6 is of a hydraulic type, and a hydraulic pressure indicator is provided on the pressurizing device 6 in order to ensure the safety of use of the pressurizing device 6.
The second embodiment is as follows: in this embodiment, the device for measuring young's modulus of rigid material based on fiber grating sensor according to the first embodiment is further limited, and in this embodiment, the device further includes a fiber grating temperature sensor 5-2;
the fiber bragg grating temperature sensor is packaged and adhered to the rigid material 1 to be measured at the position of the fiber bragg grating 5 in a stress-free metal mode, and the fiber bragg grating temperature sensor 5-2 is used for carrying out temperature compensation on the fiber bragg grating strain sensor 5-1.
In the embodiment, the fiber grating temperature sensor 5-2 is adhered to the rigid material 1 to be measured at the other gate region of the fiber grating 5 through a metal stress-free package.
The third concrete implementation mode: in the present embodiment, the young's modulus measuring device for a rigid material based on a fiber grating sensor is further defined as the first embodiment, and in the present embodiment, the central axis of the rigid material 1 to be measured, the central axis of the pressure sensor 4, and the central axis of the pressure application end of the pressure device 6 are overlapped.
In the present embodiment, the overall stress balance is ensured by the above arrangement.
The fourth concrete implementation mode: in the present embodiment, the young's modulus measuring apparatus for a rigid material based on a fiber grating sensor according to the first embodiment is further limited, and in the present embodiment, the number of the support posts 10-2 is three or more.
In the present embodiment, the number of the pillars 10-2 is three or more to secure the stability of the metal frame 10, and as shown in fig. 1, the number of the pillars 10-2 is 4, and 4 pillars 10-2 are arranged in a rectangular arrangement.
The fifth concrete implementation mode: in the present embodiment, the young's modulus measuring device for a rigid material based on a fiber grating sensor is further defined as the first embodiment, and in the present embodiment, the fiber grating strain sensor 5-1 is cured on the side surface of the rigid material 1 to be measured by a resin adhesive.
In the present embodiment, the fiber grating strain sensor 5-1 is not limited to being cured by resin adhesive, for example, the fiber grating strain sensor 5-1 is metalized and then cured by laser welding, but this curing method is only suitable for the rigid material 1 to be measured welded with nickel.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A rigid material Young modulus measuring device based on a fiber bragg grating sensor is characterized by comprising a fiber bragg grating strain sensor (5-1), a pressure sensor (4), a fiber bragg grating (5), a pressurizing device (6), a fiber bragg grating wavelength demodulator (8), a universal meter (9), a metal frame (10), a partition plate (2) and a spring (3);
the metal frame (10) comprises a top plate (10-1), a support post (10-2) and a bottom plate (10-3);
the bottom plate (10-3) is arranged on a horizontal plane; the support columns (10-2) are vertically arranged, and the bottom ends of the support columns (10-2) are fixed on the bottom plate (10-3); the top end of the strut (10-2) penetrates through the partition plate (2) and then is fixed on the lower surface of the top plate (10-1), so that the top plate (10-1), the bottom plate (10-3) and the partition plate (2) are parallel to each other, and the partition plate (2) can move up and down along the strut (10-2) between the top plate (10-1) and the bottom plate (10-3);
the spring (3) is vertically arranged on the strut (10-2) between the clapboard (2) and the top plate (10-1);
the base of the pressurizing device (6) is vertically arranged on the bottom plate (10-3), and the pressurizing force application end of the pressurizing device is supported on the lower surface of the partition plate (2);
the pressure sensor (4) is fixed on the upper surface of the partition plate (2), and the rigid material (1) to be measured is placed on the upper surface of the pressure sensor (4);
the fiber bragg grating (5) is arranged on the side surface of the rigid material (1) to be measured;
the fiber bragg grating strain sensor (5-1) is solidified on the rigid material (1) to be measured at the position of the fiber bragg grating (5), and the sensing signal output end of the fiber bragg grating strain sensor (5-1) is connected with the sensing signal input end of the fiber bragg grating wavelength demodulator (8);
the demodulation signal output end of the fiber grating wavelength demodulator (8) is connected with the demodulation signal input end of the computer (7);
the pressure signal output end of the pressure sensor (4) is connected with the pressure signal input end of the multimeter (9).
2. A fiber grating sensor based rigid material young's modulus measuring device according to claim 1, characterized in that the measuring device further comprises a fiber grating temperature sensor (5-2);
the fiber bragg grating temperature sensor (5-2) is packaged and adhered to the rigid material (1) to be measured at the position of the fiber bragg grating (5) in a stress-free metal mode, and is used for carrying out temperature compensation on the fiber bragg grating strain sensor (5-1).
3. The device for measuring the Young's modulus of the rigid material based on the fiber bragg grating sensor as claimed in claim 1, wherein the central axis of the rigid material (1) to be measured, the central axis of the pressure sensor (4) and the central axis of the pressurizing force application end of the pressurizing device (6) are coincident.
4. A device for measuring young's modulus of rigid material based on fiber grating sensor according to claim 1, wherein the number of the pillars (10-2) is three or more.
5. The device for measuring the Young's modulus of the rigid material based on the fiber grating sensor as claimed in claim 1, wherein the fiber grating strain sensor (5-1) is cured on the side surface of the rigid material (1) to be measured through resin glue.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921123276.3U CN210166233U (en) | 2019-07-17 | 2019-07-17 | Rigid material Young modulus measuring device based on fiber grating sensor |
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| CN201921123276.3U CN210166233U (en) | 2019-07-17 | 2019-07-17 | Rigid material Young modulus measuring device based on fiber grating sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208096A (en) * | 2019-07-17 | 2019-09-06 | 黑龙江大学 | A kind of rigid material young modulus measuring device based on fiber-optic grating sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208096A (en) * | 2019-07-17 | 2019-09-06 | 黑龙江大学 | A kind of rigid material young modulus measuring device based on fiber-optic grating sensor |
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