CN202501823U - Long stroke linear displacement non-contact measuring device - Google Patents
Long stroke linear displacement non-contact measuring device Download PDFInfo
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- CN202501823U CN202501823U CN2012200251006U CN201220025100U CN202501823U CN 202501823 U CN202501823 U CN 202501823U CN 2012200251006 U CN2012200251006 U CN 2012200251006U CN 201220025100 U CN201220025100 U CN 201220025100U CN 202501823 U CN202501823 U CN 202501823U
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Abstract
The utility model discloses a long stroke linear displacement non-contact measuring device for measuring linear displacement of a permanent magnet. The device comprises a micro-control unit and at least two linear Hall sensors. The linear Hall sensors are arranged in parallel along a same axis direction and are parallel to a linear displacement axis of the permanent magnet. Each of the linear Hall sensors includes a voltage output end. Each voltage output end is respectively connected with an input terminal of the micro-control unit. The utility model is provided with a plurality of linear Hall sensors additionally, accurate measurement of long stroke linear displacement by the device is realized, an application scope of the device is enlarged, problems of a short measurement stroke when using a single linear Hall sensor and low linearity in measuring a long stroke are overcome, at the same time, increasing the length of the permanent magnet is not needed, and an original material cost and a mounting space of the permanent magnet are reduced.
Description
Technical field
The utility model relates to the linear displacement field of measurement, relates in particular to a kind of long stroke linear displacement non-contact measurement apparatus based on Hall effect.
Background technology
The variation of the voltage output meeting accurate tracking magnetic flux density of linear hall sensor (Hall IC).When static (no magnetic field), generally output voltage is arranged on the half the of the supply voltage that equals in WV and the operating temperature range, when increasing magnetic field, the South Pole, will increase or reduce output voltage; On the contrary, when increasing magnetic field, the arctic, will reduce or increase output voltage, so be commonly used to measure electric current, angle, linear displacement and magnetic flux etc., reflect mechanical event with the mode of magnetically-actuated.At present; The IC that measures straight-line displacement is mainly used in the straight-line displacement of Displacement Measurement scope very little (generally in 15mm); But for the bigger motion of displacement range, the output signal of Hall IC is difficult to and the sexual intercourse of tested displacement retention wire, and demonstrates a kind of nonlinear relationship; Like range is 23mm, and the linearity of output voltage-displacement curve of Hall IC is 9.38%.In order to overcome the defective of the linearity, often need increase the length of permanent magnet, but this method has not only increased the installation dimension of permanent magnet, thereby and because permanent magnetic material cost fast rise has increased the cost of entire product.
The utility model content
In view of the defective that above-mentioned prior art exists, the purpose of the utility model is to propose a kind of long stroke linear displacement non-contact measurement apparatus based on Hall effect.
The purpose of the utility model will be achieved through following technical scheme:
A kind of long stroke linear displacement non-contact measurement apparatus; Be used to measure the straight-line displacement of permanent magnet; Comprise a micro-control unit (MCU); Also comprise at least two linear hall sensor (Hall IC), said linear hall sensor is set up in parallel along same axis direction, and with the straight-line displacement parallel axes of said permanent magnet; Include a voltage output end on each said linear hall sensor, each voltage output end is connected with the input end of said micro-control unit respectively.
Preferably; Above-mentioned long stroke linear displacement non-contact measurement apparatus; Wherein: the voltage output end of said linear hall sensor is output as simulating signal; Said micro-control unit is built-in with the analog to digital converter corresponding with said linear hall sensor (ADC), and each voltage output end is connected with the input end of micro-control unit through corresponding analog to digital converter respectively.
Preferably; Above-mentioned long stroke linear displacement non-contact measurement apparatus; Wherein: the voltage output end of said linear hall sensor is output as pulse-width signal; Said micro-control unit is built-in with the counter corresponding with said linear hall sensor, and each voltage output end is connected with the input end of micro-control unit through corresponding counter respectively.
Preferably, above-mentioned long stroke linear displacement non-contact measurement apparatus, wherein: the output terminal of said micro-control unit comprises a pulse-width modulator (PWM), with output pwm signal.
Preferably, above-mentioned long stroke linear displacement non-contact measurement apparatus, wherein: said pulse-width modulator is connected with a low-pass filter (LPF), with the output simulating signal.
Preferably, above-mentioned long stroke linear displacement non-contact measurement apparatus, wherein: the output terminal of said micro-control unit is connected with a digital to analog converter, with the output simulating signal.
Preferably, above-mentioned long stroke linear displacement non-contact measurement apparatus, wherein: the output terminal of said micro-control unit is connected with a LIN transceiver, and said LIN transceiver is connected with the LIN bus, with output LIN signal.
The utility model is equipped with a plurality of linear hall sensors, through the output voltage-displacement curve neutral line section of each linear hall sensor is spliced, and obtains the output voltage-displacement curve of long stroke; Micro-control unit passes through firmware with the entire curve linearization simultaneously; Realized of the accurate measurement of this device, enlarged the range of application of this device, overcome that to measure stroke when using single linear hall sensor short for long stroke linear displacement; And the low problem of the linearity when measuring long stroke; Simultaneously, need not to increase the length of permanent magnet, reduced the raw materials cost and the installing space of permanent magnet.
Following constipation closes the embodiment accompanying drawing, the embodiment of the utility model is done further to detail, so that the utility model technical scheme is easier to understand, grasp.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the connection synoptic diagram of the utility model embodiment;
Fig. 3 is magnetic field intensity-displacement curve that relative two linear hall sensors of the permanent magnet of the utility model embodiment produce;
Fig. 4 is the output voltage-displacement curve of the linear hall sensor of the utility model embodiment;
Fig. 5 is the output voltage-displacement curve that obtains after the MCU of the utility model embodiment handles.
Embodiment
Through specific embodiment the utility model is described below, but the utility model is not limited thereto.
Embodiment
A kind of long stroke linear displacement non-contact measurement apparatus of present embodiment; Like Fig. 1～straight-line displacement that is used to measure permanent magnet 1 shown in Figure 5; Comprise micro-control unit (MCU) 2; Also comprise two linear hall sensor IC1 31 and IC2 32, IC1 31 and IC2 32 are set up in parallel along same axis direction, and parallel with the straight-line displacement axis X of permanent magnet 1; Be respectively equipped with voltage output end on IC1 31 and the IC2 32, each voltage output end is connected with the input end of micro-control unit 2 respectively.Distance between IC1 31 and the IC2 32 is configured such that at the most the displaced position that IC1 31 linearity range B11 in output voltage-displacement curve of IC1 31 and IC2 32 finish pairing permanent magnet 1 is the displaced position that IC2 32 linearity range B21 begin pairing permanent magnet 1.
When the voltage output end of linear hall sensor IC1 31 and IC2 32 is output as simulating signal; Micro-control unit 2 is built-in with the analog to digital converter ADC1 41 and ADC2 42 corresponding with linear hall sensor IC1 31 and IC2 32, and each voltage output end is connected with the input end of micro-control unit 2 with ADC2 42 through the analog to digital converter ADC1 41 of correspondence respectively.When the voltage output end of linear hall sensor IC1 31 and IC2 32 was output as pulse-width signal, the built-in analog to digital converter ADC1 41 of micro-control unit 2 and ADC2 42 replaced with the counter (Counter) of corresponding number.
The way of output of micro-control unit 2 has plurality of optional, comprising: the output terminal of micro-control unit 2 comprises pulse-width modulator (PWM) 5, directly output pwm signal; Pulse-width modulator 5 is connected with low-pass filter (LPF) 6, with the output simulating signal; The output terminal of micro-control unit 2 is connected with LIN transceiver 7, and LIN transceiver 7 is connected with LIN bus 8, with output LIN signal, is connected into communication network; The output terminal of micro-control unit 2 is connected with digital to analog converter (DAC) 9, with the output simulating signal.
Use the long stroke linear displacement non-contact measurement apparatus of present embodiment; When permanent magnet 1 is parallel to IC1 31 and does straight-line displacement with IC2 32; The induced field of IC1 31 and IC2 32 is changed; As shown in Figure 3, wherein curve B 1 and B2 are respectively the magnetic field intensity-displacement curve of permanent magnet 1 relative IC1 31 and IC2 32 generations, and B11 is the linearity range that corresponding IC1 31 induced fields of the linear displacement of permanent magnet 1 change; B21 is the linearity range that corresponding IC2 32 induced fields of the linear displacement of permanent magnet 1 change, and the displaced position that B11 finishes pairing permanent magnet 1 is the displaced position that B21 begins pairing permanent magnet 1.The induced field voltage output that makes IC1 31 and IC2 32 that changes changes, and voltage is output as 0 ~ 5V.Voltage output signal is through ADC1 41 and ADC2 42 input micro-control units 2; As shown in Figure 4; Output voltage-displacement curve neutral line section of IC1 31 and IC2 32 is spliced; And obtain the output voltage-displacement curve of long stroke, simultaneously micro-control unit 2 through firmware with the entire curve linearization, thereby guaranteed the linearity of long stroke measurment.Can show like Fig. 5, satisfy following formula: Vout (x)=(Voq1+Sensitivity1 * B1 (x))/2,0 < x ≤stroke/>2 between output voltage and the displacement; Vout (x)=(Voq2+Sensitivity2 * B2 (x))/2+Vmid, stroke/2 < x ≤stroke.Wherein, Vout is an output voltage, and Voq is a quiescent voltage, and Vmid is a mid-point voltage, and Sensitivity is sensitivity, and stroke is a stroke.Output voltage is handled back output through micro-control unit 2, and the way of output comprises the output with PWM, simulation output or the output of LIN signal etc.Use present embodiment, increase the displacement range to 42mm, its linearity improvement to 2%.
Present embodiment adds linear hall sensor IC1 31 and IC2 32; Realized of the accurate measurement of this device, enlarged the range of application of this device, overcome that to measure stroke when using single linear hall sensor short for long stroke linear displacement; And the low problem of the linearity when measuring long stroke; Simultaneously, need not to increase the length of permanent magnet, reduced the raw materials cost and the installing space of permanent magnet.
Claims (7)
1. one kind long stroke linear displacement non-contact measurement apparatus; Be used to measure the straight-line displacement of permanent magnet; Comprise a micro-control unit; It is characterized in that: also comprise at least two linear hall sensor, said linear hall sensor is set up in parallel along same axis direction, and with the straight-line displacement parallel axes of said permanent magnet; Include a voltage output end on each said linear hall sensor, each voltage output end is connected with the input end of said micro-control unit respectively.
2. long stroke linear displacement non-contact measurement apparatus according to claim 1; It is characterized in that: the voltage output end of said linear hall sensor is output as simulating signal; Said micro-control unit is built-in with the analog to digital converter corresponding with said linear hall sensor, and each voltage output end is connected with the input end of micro-control unit through corresponding analog to digital converter respectively.
3. long stroke linear displacement non-contact measurement apparatus according to claim 1; It is characterized in that: the voltage output end of said linear hall sensor is output as pulse-width signal; Said micro-control unit is built-in with the counter corresponding with said linear hall sensor, and each voltage output end is connected with the input end of micro-control unit through corresponding counter respectively.
4. long stroke linear displacement non-contact measurement apparatus according to claim 1, it is characterized in that: the output terminal of said micro-control unit comprises a pulse-width modulator.
5. long stroke linear displacement non-contact measurement apparatus according to claim 4, it is characterized in that: said pulse-width modulator is connected with a low-pass filter.
6. long stroke linear displacement non-contact measurement apparatus according to claim 1, it is characterized in that: the output terminal of said micro-control unit is connected with a digital to analog converter.
7. long stroke linear displacement non-contact measurement apparatus according to claim 1 is characterized in that: the output terminal of said micro-control unit is connected with a LIN transceiver, and said LIN transceiver is connected with the LIN bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200251006U CN202501823U (en) | 2012-01-19 | 2012-01-19 | Long stroke linear displacement non-contact measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200251006U CN202501823U (en) | 2012-01-19 | 2012-01-19 | Long stroke linear displacement non-contact measuring device |
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| CN202501823U true CN202501823U (en) | 2012-10-24 |
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| CN2012200251006U Expired - Lifetime CN202501823U (en) | 2012-01-19 | 2012-01-19 | Long stroke linear displacement non-contact measuring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538653A (en) * | 2012-01-19 | 2012-07-04 | 哈姆林电子(苏州)有限公司 | Long stroke linear displacement non-contact measuring device |
| CN104515462A (en) * | 2014-12-23 | 2015-04-15 | 柳州柳工叉车有限公司 | Displacement detection device and method |
| CN104793713A (en) * | 2015-04-07 | 2015-07-22 | 深圳市万普拉斯科技有限公司 | Automatic user interface matching method for mobile terminal and mobile terminal |
| CN112090020A (en) * | 2020-11-23 | 2020-12-18 | 杭州米芯微电子有限公司 | Linear Hall sensor type counting module and corresponding counter and skipping rope |
| CN114812367A (en) * | 2022-04-26 | 2022-07-29 | 北京特倍福电子技术有限公司 | Non-contact external magnetic induction linear displacement measurement method |
-
2012
- 2012-01-19 CN CN2012200251006U patent/CN202501823U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538653A (en) * | 2012-01-19 | 2012-07-04 | 哈姆林电子(苏州)有限公司 | Long stroke linear displacement non-contact measuring device |
| CN104515462A (en) * | 2014-12-23 | 2015-04-15 | 柳州柳工叉车有限公司 | Displacement detection device and method |
| CN104793713A (en) * | 2015-04-07 | 2015-07-22 | 深圳市万普拉斯科技有限公司 | Automatic user interface matching method for mobile terminal and mobile terminal |
| CN112090020A (en) * | 2020-11-23 | 2020-12-18 | 杭州米芯微电子有限公司 | Linear Hall sensor type counting module and corresponding counter and skipping rope |
| CN112090020B (en) * | 2020-11-23 | 2021-09-10 | 杭州米芯微电子有限公司 | Linear Hall sensor type counting module and corresponding counter and skipping rope |
| CN114812367A (en) * | 2022-04-26 | 2022-07-29 | 北京特倍福电子技术有限公司 | Non-contact external magnetic induction linear displacement measurement method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20121024 |