CN203349776U - Displacement measuring device based on giant magnetoresistance effect - Google Patents
Displacement measuring device based on giant magnetoresistance effect Download PDFInfo
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- CN203349776U CN203349776U CN 201320442512 CN201320442512U CN203349776U CN 203349776 U CN203349776 U CN 203349776U CN 201320442512 CN201320442512 CN 201320442512 CN 201320442512 U CN201320442512 U CN 201320442512U CN 203349776 U CN203349776 U CN 203349776U
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Abstract
The utility model discloses a displacement measuring device base on giant magnetoresistance effect; the measuring device comprises a sensor measuring circuit arranged on a platform; the platform is connected with a screw rod of a screw micrometer through a sliding stand; the screw micrometer is connected with a reading support arranged on a pedestal; the sensor measuring circuit is movably connected with the platform, and comprises a giant magnetoresistance sensor and a bias magnetic field matched with the giant magnetoresistance sensor; an output end of the giant magnetoresistance sensor is connected with a potentiometer. The advantages of small size, high sensitivity and strong anti-interference capability of the giant magnetoresistance sensor are employed to obtain the purposes of wide application scope and high measuring precision.
Description
Technical field
The utility model relates to the displacement measuring device based on giant magnetoresistance effect.
Background technology
Giant magnetoresistance sensor is mainly used in fields such as surveying magnetic field, electric current, displacement, angular velocity, many outstanding technical schemes were once arranged, the Granted publication number of declaring as the poly-core magnetic electronic of on 05 04th, 2010 Suzhou Puli Science and Technology Ltd. is CN2282715, China Patent No. (ZL) is: 201010161711 utility models, patent name is a kind of utility model patent of giant magnetic resistor speed measuring sensor, and the technical scheme adopted has been utilized the giant magnetoresistance sensor measuring speed.
In existing technology, not high enough to the measuring accuracy of micro-displacement, and measuring process is more loaded down with trivial details, to experimental study, makes troubles; In Physical Experiment, utilize optical lever method to measure Young modulus, exist the not high defect of complex operation step, measuring accuracy.
The utility model content
The deficiency existed for solving prior art, the utility model discloses the displacement measuring device based on giant magnetoresistance effect, in technical solutions of the utility model, utilize potential difference meter accurately to measure the output voltage of giant magnetoresistance sensor metering circuit, coordinate mobile grade of screw-thread micrometer Accurate Calibration giant magnetoresistance sensor to be measured, experimental precision is improved.
For achieving the above object, concrete scheme of the present utility model is as follows:
Displacement measuring device based on giant magnetoresistance effect, comprise sensor measuring circuit, sensor measuring circuit is arranged on platform, platform is connected with sliding stand, sliding stand is connected with screw-thread micrometer by the screw mandrel of screw-thread micrometer, screw-thread micrometer is connected with the reading support, and the reading support is arranged on base.
Described sensor measuring circuit and platform are flexibly connected.
Described sensor measuring circuit comprises giant magnetoresistance sensor and the bias magnetic field matched with giant magnetoresistance sensor, and the output terminal of giant magnetoresistance sensor is connected with potential difference meter.
The utility model forms the sensor measurement parts by three critical pieces such as reading support, sensor measuring circuit and platforms.Sensor measuring circuit is arranged on platform, then platform is connected with the screw mandrel of screw-thread micrometer by sliding stand, screw-thread micrometer is connected with the reading support.Utilize screw-thread micrometer to calibrate to giant magnetoresistance sensor, and the movement of demarcating giant magnetoresistance sensor.As be placed in the platform rotation relatively of sensor measuring circuit above platform, sensor measuring circuit can be placed in to the top or side of platform for another example, thereby the level of realization, vertically on both direction to the measurement of tiny length, make the direction of tested magnet steel can be unrestricted.Also this measurement mechanism can be applied to the Physical Experiment of the micro-displacement measurement classes such as steel disc Young modulus, expansion coefficients of metal wire, but also be easy to realize kinetic measurement.
The method that tiny length is accurately measured that the utility model provides, that the output terminal of giant magnetoresistance sensor is connected with the support equipment potential difference meter, by magnetic links, the voltage value of accurately measuring according to potential difference meter calculates small elongation, thereby reaches the purpose of the small elongation of accurate measurement tinsel.
Core component of the present utility model is the giant magnetoresistance sensor based on giant magnetoresistance effect.There is the phenomenon of great variety during without external magnetic field in the resistivity that giant magnetoresistance effect refers to magnetic material when external magnetic field is arranged.The utility model application giant magnetoresistance sensor can accurately be measured these characteristics of changes of magnetic field, form sensor measuring circuit, for measuring the changes of magnetic field that is fixed in the tinsel upper magnetic steel, and then measure the small elongation of tinsel, reach the purpose of measuring the tinsel Young modulus.
The measuring method of the Young modulus of the displacement measuring device based on giant magnetoresistance effect comprises the following steps:
Step 1: utilize screw-thread micrometer and reading support to calibrate in the vertical direction to giant magnetoresistance sensor;
Step 2: giant magnetoresistance sensor is return to initial position, and the initial position while guaranteeing its position with calibration is identical, obtains the measured value of potential difference meter by increasing counterweight, utilizes
calculate Young modulus wiry;
In formula, Y is Young modulus wiry, and L is the former length of tinsel, and d is wire diameter, and F hangs the weight of counterweight below tinsel, and Δ l is the tiny length variable quantity of tinsel under the counterweight stretching action, and π is circular constant.
The detailed process of calibrating in described step 1 is: two magnet steel are fixed on tested tinsel by attractive force, two magnet steel apart from giant magnetoresistance sensor 7cm and above it, at first regulate the stepping reading dial and the slip reading dial makes the galvanometer nulling, make the move upward distance of each 100um of giant magnetoresistance sensor, obtain corresponding output voltage, regulate stepping reading dial and slip reading dial and make galvanometer nulling again, repeat above-mentioned experiment, making the giant magnetoresistance sensor displacement is horizontal ordinate x, the calibration figure that output voltage is ordinate y, with matlab by data fitting the figure that runs a curve.
The relational expression of giant magnetoresistance sensor displacement and output voltage: U=kX+161.286 (1) in described step 1
Utilize relational expression (1), according to the figure that runs a curve, draw the k value,
In formula, the output voltage that U is the giant magnetoresistance sensor accurately measured of potential difference meter, the displacement that X is giant magnetoresistance sensor, k is the data fitting slope of a curve.
In described step 2, measuring process is: the next counterweight of the tested tinsel of every increase, potential difference meter shows a reading, be worth Δ U with by poor method, processing the potential difference meter measurement data and be averaged, bring the k value in Δ U and step 1 into relational expression: Δ l=Δ U/ (k*4), obtain Δ l value, finally by
Obtain Young modulus wiry, in formula, the mean value that Δ U is voltage, Y is Young modulus wiry, and L is the former length of tinsel, and d is wire diameter, F hangs the weight of counterweight below tinsel, Δ l is the tiny length variable quantity of tinsel under the counterweight stretching action, and π is circular constant, and k is the data fitting rate of curve.
The beneficial effects of the utility model:
The related displacement measuring device of the utility model is applicable to the measurement of micro-displacement, by giant magnetoresistance sensor be applied to Young modulus in Physical Experiment measure upper, the utility model suitable Physical Experiment measurement, physics experiment teaching and other experiments of measuring etc. in a big way in utilization.
In the one, technical solutions of the utility model, utilize potential difference meter accurately to measure the output voltage of giant magnetoresistance sensor metering circuit, coordinate mobile grade of screw-thread micrometer Accurate Calibration giant magnetoresistance sensor to be measured, experimental precision is improved.
The tinsel Young modulus measuring method that the 2nd, the utility model provides, saved the support equipments such as telescope, optical lever.
The 3rd. the tinsel Young modulus measuring method that the utility model provides is easy and simple to handle than optical lever method, and measuring accuracy improves.
The 4th. the utility model utilizes giant magnetoresistance sensor to have the advantages such as volume is little, highly sensitive, antijamming capability is strong, reach usable range extensively, measure accurately higher purpose.
The 5th. project organization of the present utility model can guarantee the facility of measuring.
The accompanying drawing explanation:
Fig. 1 apparatus structure schematic diagram of the present utility model;
Fig. 2 metering circuit schematic diagram;
Fig. 3 calibration curve figure;
In figure, 1 reading support, 2 platforms, 3 sensor measuring circuits, 4 screw-thread micrometers, 5 bases, 6 sliding stands.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is elaborated:
As shown in Figure 1, displacement measuring device based on giant magnetoresistance effect, comprise sensor measuring circuit 3, sensor measuring circuit 3 is arranged on platform 2, platform 2 is connected with sliding stand 6, sliding stand 6 is connected with screw-thread micrometer 4 by the screw mandrel of screw-thread micrometer 4, and screw-thread micrometer 4 is connected with reading support 1, and reading support 1 is arranged on base 5; Sensor measuring circuit 3 is flexibly connected with platform 2;
As shown in Figure 2, sensor measuring circuit 3 comprises giant magnetoresistance sensor U1 and the bias magnetic field U2 matched with giant magnetoresistance sensor U1, and the output terminal of giant magnetoresistance sensor U1 is connected with potential difference meter U3.
One of core component of the present utility model is the sensor measuring circuit that application giant magnetoresistance sensor U1 makes, and two of core component of the present utility model is screw-thread micrometers 4, and three of core component of the present utility model is reading supports 1.The utility model preferred forms forms the sensor measurement parts by reading support 1, sensor measuring circuit 3 and 4 three core components of screw-thread micrometer, the sensor measurement parts are connected with potential difference meter U3, potential difference meter U3 is used for measuring the output signal of giant magnetoresistance sensor again.Sensor measuring circuit 3 is placed on platform 2, platform 2 also is connected with the screw mandrel of screw-thread micrometer 4 by sliding stand 6, sliding stand 6 and 1 combination of reading support, by the operation of reading support 1 and screw-thread micrometer 4, sensor measuring circuit 3 can be up and down, move left and right and can read its displacement numerical value by screw-thread micrometer 4.The measurement of the Young modulus based on giant magnetoresistance effect is divided into calibration, measures two parts.
1. calibrating method: two magnet steel are fixed on tested tinsel by attractive force, apart from the about 7cm of giant magnetoresistance sensor U1, and above it, utilize reading support 1 and screw-thread micrometer 4 to calibrate in the vertical direction to giant magnetoresistance sensor U1, at first regulate the stepping reading dial and the slip reading dial makes the galvanometer nulling, make the move upward distance of each 100um of giant magnetoresistance sensor U1, regulate stepping reading dial and slip reading dial and make galvanometer nulling again, repeatedly repeat above-mentioned experiment, making giant magnetoresistance sensor U1 displacement is horizontal ordinate x, the calibration figure that output voltage is ordinate y, with matlab by data fitting and run a curve figure as shown in Figure 3, the corresponding relation formula is:
U＝kX+161.286 （1）
The variation and the giant magnetoresistance sensor displacement X that obtain voltage in 0-1.2mm variation range are linear, according to curve map and relational expression (1), draw slope K=0.062.(1) in formula, the output voltage that U is the giant magnetoresistance sensor U1 that accurately measures of potential difference meter U3, the displacement that X is giant magnetoresistance sensor, the slope that K is matched curve.
2. measuring method: giant magnetoresistance sensor U1 is return to initial position, and the initial position while guaranteeing its position and calibration is identical.The next counterweight of the tested tinsel of every increase, potential difference meter U3 shows a reading, be worth Δ U with by poor method, processing the potential difference meter measurement data and be averaged, bring Δ l=Δ U/ (k*4)=0.1095mm into and obtain tiny length variation delta l wiry, so can calculate Young modulus wiry by (2) formula:
(2) in formula, the mean value that Δ U is voltage, Y is Young modulus wiry, L is the former length of tinsel, and d is wire diameter, and F hangs the weight of counterweight below tinsel, Δ l is the tiny length variable quantity of tinsel under the counterweight stretching action, and π is circular constant.
Claims (3)
1. the displacement measuring device based on giant magnetoresistance effect, it is characterized in that, comprise sensor measuring circuit, sensor measuring circuit is arranged on platform, platform is connected with sliding stand, sliding stand is connected with screw-thread micrometer by the screw mandrel of screw-thread micrometer, and screw-thread micrometer is connected with the reading support, and the reading support is arranged on base.
2. the displacement measuring device based on giant magnetoresistance effect as claimed in claim 1, is characterized in that, described sensor measuring circuit and platform are flexibly connected.
3. the displacement measuring device based on giant magnetoresistance effect as claimed in claim 1, it is characterized in that, described sensor measuring circuit comprises giant magnetoresistance sensor and the bias magnetic field matched with giant magnetoresistance sensor, and the output terminal of giant magnetoresistance sensor is connected with potential difference meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201320442512 CN203349776U (en) | 2013-07-22 | 2013-07-22 | Displacement measuring device based on giant magnetoresistance effect |
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| CN 201320442512 CN203349776U (en) | 2013-07-22 | 2013-07-22 | Displacement measuring device based on giant magnetoresistance effect |
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| CN 201320442512 Expired - Fee Related CN203349776U (en) | 2013-07-22 | 2013-07-22 | Displacement measuring device based on giant magnetoresistance effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353274A (en) * | 2013-07-22 | 2013-10-16 | 山东交通学院 | Giant magnetoresistance effect based displacement measuring apparatus and young modulus measuring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353274A (en) * | 2013-07-22 | 2013-10-16 | 山东交通学院 | Giant magnetoresistance effect based displacement measuring apparatus and young modulus measuring method |
| CN103353274B (en) * | 2013-07-22 | 2016-01-27 | 山东交通学院 | Based on the displacement measuring device of giant magnetoresistance effect and the measuring method of Young modulus |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20140722 |
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| EXPY | Termination of patent right or utility model |