CN102636296B - Magnetic resistance measurement sensing system and method thereof - Google Patents
Magnetic resistance measurement sensing system and method thereof Download PDFInfo
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- CN102636296B CN102636296B CN201210123783.3A CN201210123783A CN102636296B CN 102636296 B CN102636296 B CN 102636296B CN 201210123783 A CN201210123783 A CN 201210123783A CN 102636296 B CN102636296 B CN 102636296B
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Abstract
The invention relates to the field of machinery, in particular to a magnetic resistance measurement sensing system and a magnetic resistance measurement sensing method, through which the zero drift amount can be decreased during long-term use. The magnetic resistance measurement sensing system comprises a rigid lever, a pendulum magnet, two limit magnets, a Hall element and a computation system, wherein the rigid lever is provided with a fixed rotation shaft, a force application end and a measurement end; the force application end and the measurement end swing by taking the fixed rotation shaft as center; the pendulum magnet is connected with the measurement end of the rigid lever; the limit magnets are respectively arranged at two sides of the pendulum magnet and in a magnetic field range of the pendulum magnet; the limit magnets are opposite to the magnetic poles with same polarity of the pendulum magnet; when the rigid lever swings by taking the fixed rotation shaft as center under the action of external force, the pendulum magnet is close to the limit magnet at one side and far away from the limit magnet at the other side at the same time; the Hall element is arranged in the magnetic field range of the pendulum magnet and between the pendulum magnet and the limit magnets, and used for detecting the magnetic field change of the pendulum magnet and outputting signals; and the computation system is used for receiving the signals and computing the signals to obtain the magnitude of the external force stressed by the rigid lever.
Description
Technical field
The present invention relates to mechanical field, be specifically related to a kind of reluctance force force-measuring sensing system and method thereof.
Background technology
At production industries such as knitting, weaving, chemical fibre, cables, the constant-tension of fiber, silk thread is needed to strict control, because above-mentioned industry needs to use in process of production, can carry out for a long time power, continuously, the sensor of real-time, high precision monitor, but current sensor zero shift amount when long-term use is larger, for needs high precision, quick-adjustsing production industry, has limitation.
Summary of the invention
The invention provides a kind of reluctance force force-measuring sensing system and method thereof, can when long-term use, reduce zero point drift amount.
The invention provides a kind of reluctance force force-measuring sensing system, comprising:
Rigid lever, it has fixed rotating shaft, force side and measuring junction, and described force side and measuring junction swing centered by described fixed rotating shaft;
Movable pendulum magnet, it is connected with the measuring junction of described rigid lever;
Two spacing magnets, two described spacing magnets are separately positioned on the both sides of described movable pendulum magnet and in the magnetic field range of described movable pendulum magnet, described spacing magnet is relative with the magnetic pole of described movable pendulum magnet identical polar;
When described rigid lever is subject to external force and swings centered by described fixed rotating shaft, described movable pendulum magnet near described in a side when spacing magnet movement away from spacing magnet described in opposite side;
Hall element, it is arranged in the magnetic field range of described movable pendulum magnet, and between described movable pendulum magnet and described spacing magnet, for detection of changes of magnetic field the output signal to described movable pendulum magnet;
Computing system, it receives described signal, and described signal is calculated to the external force size that described rigid lever is subject to.
In various embodiments of the present invention, preferably, described fixed rotating shaft is through the center of gravity of described rigid lever.
In various embodiments of the present invention, preferably, two described spacing magnets are identical or different.
In various embodiments of the present invention, preferably, described movable pendulum magnet and two described spacing magnets are identical or different.
In various embodiments of the present invention, preferably, described movable pendulum magnet and two described spacing magnets are permanent magnet or electromagnet.
In various embodiments of the present invention, preferably, further comprise:
Differential amplifier and a plurality of described Hall element, described a plurality of Hall elements lay respectively at the both sides of described movable pendulum magnet, and between movable pendulum magnet and described spacing magnet; Every two described Hall elements are connected with a described differential amplifier jointly; Described differential amplifier receives the signal of described Hall element output and processes, and described signal is after treatment sent to described computing system;
Or
A plurality of described Hall elements and processor, a plurality of described Hall elements lay respectively at the both sides of described movable pendulum magnet, and between movable pendulum magnet and described spacing magnet; Described processor is processed the described signal of described Hall element output, and the described signal after processing is sent to described computing system.
In various embodiments of the present invention, preferably, described Hall element has temperature compensation unit.
The present invention also provides a kind of reluctance force force-measuring sensing method, and described method comprises the steps:
Utilization as described in a kind of reluctance force force-measuring sensing system;
When rigid lever is subject to external force and swings centered by fixed rotating shaft, movable pendulum magnet near the spacing magnet movement of a side time away from the spacing magnet of opposite side;
Two described spacing magnets produce repulsion to described movable pendulum magnet, suppress the swing of described movable pendulum magnet, until described movable pendulum magnet is static; Meanwhile, Hall element detects the changes of magnetic field of described movable pendulum magnet, output signal;
Described signal is calculated to the size of described external force.
In various embodiments of the present invention, preferably, when thering is a plurality of described Hall elements and differential amplifier, the changes of magnetic field of described movable pendulum magnet at described Hall element, detected, after the step of output signal, and before described computing system calculates the big or small step of described external force to described signal, further comprise:
A plurality of described Hall elements detect respectively the changes of magnetic field of described movable pendulum magnet, and every two described Hall elements send after the described signal detecting is processed by described differential amplifier.
In various embodiments of the present invention, preferably, when described Hall element has temperature compensation unit, the step that the changes of magnetic field of described movable pendulum magnet detected at Hall element further comprises: the changes of magnetic field of described movable pendulum magnet at described Hall element, detected, for the variation of described movable pendulum magnets magnetic fields, carry out temperature compensation.
A kind of reluctance force force-measuring sensing system and the method thereof that by various embodiments of the present invention, provide, can bring following beneficial effect:
By two spacing magnets being set on movable pendulum magnet side, within two spacing magnets are arranged on movable pendulum magnets magnetic fields scope, and spacing magnet is in the magnetic field range of movable pendulum magnet, spacing magnet is relative with the magnetic pole of movable pendulum magnet identical polar, when movable pendulum magnet is subject to external force swing, movable pendulum magnet approaches one of them spacing magnet, according to the principle of homopolar-repulsion, spacing magnet is to repulsion of movable pendulum magnet, suppress the swing of movable pendulum magnet, reached when movable pendulum magnet swings, system can be adjusted rapidly, suppressing movable pendulum magnet swings, when long-term use, reduced zero shift amount simultaneously,
By by fixed rotating shaft through the center of gravity of rigid lever, using center of gravity as the stressed fulcrum of rigid lever, can reach when whole sensor-based system is subject to external impacts, external force is less on the impact of reluctance force force-measuring sensing system;
By a plurality of Hall elements are set, and be connected on differential amplifier, can obtain more accurately the size of external force, reach the ability of high precision monitor; Can effectively eliminate the zero point drift that Hall element is introduced simultaneously;
By set temperature compensating unit in Hall element, in the time of can working as ambient temperature variation, reduce the impact on Hall element testing result.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in below describing is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawing illustrated embodiments other embodiment and accompanying drawing thereof.
Fig. 1 is the structural representation of a kind of reluctance force force-measuring sensing of the present invention system embodiment;
Fig. 2 is the process flow diagram of a kind of reluctance force force-measuring sensing method of the present invention embodiment.
Embodiment
Below with reference to accompanying drawing, the technical scheme of various embodiments of the present invention is carried out to clear, complete description, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the present invention protects.
The invention provides a kind of reluctance force force-measuring sensing system, comprising:
Rigid lever, it has fixed rotating shaft, force side and measuring junction, and described force side and measuring junction swing centered by described fixed rotating shaft;
Movable pendulum magnet, it is connected with the measuring junction of described rigid lever;
Two spacing magnets, two described spacing magnets are separately positioned on the both sides of described movable pendulum magnet and in the magnetic field range of described movable pendulum magnet, described spacing magnet is relative with the magnetic pole of described movable pendulum magnet identical polar;
When described rigid lever is subject to external force and swings centered by described fixed rotating shaft, described movable pendulum magnet near described in a side when spacing magnet movement away from spacing magnet described in opposite side;
Hall element, it is arranged in the magnetic field range of described movable pendulum magnet, and between described movable pendulum magnet and described spacing magnet, for detection of changes of magnetic field the output signal to described movable pendulum magnet;
Computing system, it receives described signal, and described signal is calculated to the external force size that described rigid lever is subject to.
The force side of described rigid lever and measuring junction can be arranged on same one end of rigid lever, also can be arranged on different ends, be that rigid lever has ，Dang force side, two ends, left and right and measuring junction all when left end or right-hand member, fixed rotating shaft is arranged on the other end of rigid lever; When force side and measuring junction are during respectively at left end and right-hand member, fixed rotating shaft is arranged between the two ends of rigid lever.
Movable pendulum magnet is arranged on the measuring junction of rigid lever, has two spacing magnets near measuring junction, and lever relative limit magnet be take fulcrum and can be swung as axle.Should be understood that rigid lever is subject to after external force, can only in a direction, swing, for example, when rigid lever horizontal positioned, rigid lever has been subject to external force, under the effect of external force, rigid lever only can swing in the horizontal direction, can not swing at vertical direction.
Should be understood that movable pendulum magnet and spacing magnet can produce the device in magnetic field for magnet or other.
Hall element is arranged in the magnetic field range of movable pendulum magnet, and between movable pendulum magnet and spacing magnet.
Should be understood that movable pendulum magnet respectively and between two spacing magnets, formed two spaces, Hall element can be arranged in any one space.
When described rigid lever is subject to external force and swings centered by described fixed rotating shaft, described movable pendulum magnet near described in a side when spacing magnet movement away from spacing magnet described in opposite side, now, described movable pendulum magnet magnetic field around changes, Hall element detects the variation in magnetic field, exports the signal of corresponding changes of magnetic field.
Computing system obtains the size of movable pendulum magnet external force by calculating described signal.Also can further extrapolate the displacement of movable pendulum magnet.
The occasion that should be understood that general use force cell all can be with mechanical vibrations, but existing force cell governing speed is slow, easily produces zero shift.A kind of reluctance force force-measuring sensing system provided by the invention can work having under the environment of external shock, reduces the impact of external environment on system itself.
In various embodiments of the present invention, preferably, described fixed rotating shaft is through the center of gravity of described rigid lever.When the center of gravity place with rigid lever arranges fixed rotating shaft, rigid lever integral body can not produce rotation because of acceleration, can effectively eliminate the impact of external shock on sensor.
In various embodiments of the present invention, preferably, two described spacing magnets are identical or different.Can select identical two spacing magnets, can simplify technique and calculating, can adopt the magnet of batch production simultaneously; Also can select two different spacing magnets, substituting strong, to the not strict control of the requirement of magnet, comparatively easy.
In various embodiments of the present invention, preferably, described movable pendulum magnet and two described spacing magnets are identical or different.Can select identical magnet, can simplify technique and calculating, can adopt the magnet of batch production simultaneously; Also can select different magnets, substituting strong, to the not strict control of the requirement of magnet, comparatively easy.
In various embodiments of the present invention, preferably, described movable pendulum magnet and two described spacing magnets are permanent magnet or electromagnet.Because the temperature characterisitic of permanent magnet is relatively good, for example SmCo, when ambient temperature changes, smaller on the impact of system; Also can use electromagnet, strengthen the diversity of technique.
In various embodiments of the present invention, preferably, further comprise: differential amplifier and a plurality of described Hall element, a plurality of described Hall elements lay respectively at the both sides of described movable pendulum magnet, and between movable pendulum magnet and described spacing magnet; Every two described Hall elements are connected with a described differential amplifier jointly; Described differential amplifier receives the signal of described Hall element output and processes, and described signal is after treatment sent to described computing system.Also there is zero shift in Hall element, when adopting a plurality of identical Hall element difference output, can effectively eliminate the zero point drift that Hall element is introduced.Should be understood that a plurality of described Hall elements are identical Hall element.
In one embodiment, when comprising 3 Hall element A, B and C, A can be placed on to the left side of movable pendulum magnet, B, C are placed on the right side of movable pendulum magnet, and B is connected with a differential amplifier with C, and A is connected with a differential amplifier with B, A is connected with a differential amplifier with C, obtain like this 3 groups of electric signal, 3 groups of electric signal can be processed and compared, thereby obtain the size of external force.
Above-described embodiment can also be connected A separately with an operational amplifier, B is connected with a differential amplifier with C, can access like this 2 groups of data, and 2 groups of electric signal are processed and compared, and obtains the size of external force.
In one embodiment, when comprising 4 Hall element A, B, C and D, A and B can be placed on to the left side of movable pendulum magnet, C and D are placed on the right side of movable pendulum magnet, A is connected with a differential amplifier with B, and C is connected with a differential amplifier with D, obtains like this 2 groups of electric signal, 2 groups of electric signal can be processed and compared, thereby obtain the size of external force.
Should be understood that when comprising a plurality of described Hall element, also can adopt operational amplifier.For example there are a plurality of Hall elements, described Hall element is connected with operational amplifier grouping.Here several situations have wherein only been enumerated, the technology that the existing Hall element that can also adopt other is connected with operational amplifier grouping.
In various embodiments of the present invention, preferably, a plurality of described Hall elements and processor, described a plurality of Hall elements lay respectively at the both sides of described movable pendulum magnet, and between movable pendulum magnet and described spacing magnet; Described processor is processed the described signal of described Hall element output, and the described signal after processing is sent to described computing system.
The signal that a plurality of described Hall elements can be sent is processed, for example, carry out A/D conversion, and the signal after processing is sent to computing system.
In various embodiments of the present invention, preferably, described Hall element has temperature compensation unit.When the in use variation of temperature of a kind of reluctance force force-measuring sensing system is larger, can adopt the Hall element with temperature compensation unit, eliminate the zero shift that Hall element exists.
The present invention also provides a kind of reluctance force force-measuring sensing method, and described method comprises the steps:
Utilization as described in a kind of reluctance force force-measuring sensing system;
When rigid lever is subject to external force and swings centered by fixed rotating shaft, movable pendulum magnet near the spacing magnet movement of a side time away from the spacing magnet of opposite side;
Two described spacing magnets produce repulsion to described movable pendulum magnet, suppress the swing of described movable pendulum magnet, until described movable pendulum magnet is static; Meanwhile, Hall element detects the changes of magnetic field of described movable pendulum magnet, output signal;
Described signal is calculated to the size of described external force.
When rigid lever is subject to after external force, can only in a direction, swing, for example, when rigid lever horizontal positioned, rigid lever has been subject to external force, and under the effect of external force, rigid lever only can swing in the horizontal direction, can not swing at vertical direction.
Hall element is arranged in the magnetic field range of movable pendulum magnet, and between movable pendulum magnet and spacing magnet.Should be understood that movable pendulum magnet has formed two spaces with two spacing magnets respectively, Hall element can be arranged in any one space.
When described rigid lever is subject to external force and swings centered by described fixed rotating shaft, described movable pendulum magnet near described in a side when spacing magnet movement away from spacing magnet described in opposite side, now, described movable pendulum magnet magnetic field around changes, Hall element detects the variation in magnetic field, and Hall element is exported the signal of the variation in corresponding magnetic field.
Computing system obtains the external force of movable pendulum magnet by calculating signal.Can also further obtain the displacement of described movable pendulum magnet.
In various embodiments of the present invention, preferably, when thering is a plurality of described Hall elements and differential amplifier, the changes of magnetic field of described movable pendulum magnet at described Hall element, detected, after the step of output signal, and before described computing system calculates the big or small step of described external force to described signal, further comprise:
A plurality of described Hall elements detect respectively the changes of magnetic field of described movable pendulum magnet, and every two described Hall elements send after the described signal detecting is processed by described differential amplifier.
Also there is zero shift in Hall element, when adopting a plurality of same Hall element difference output, can effectively eliminate the zero point drift that Hall element is introduced.
Should be understood that a plurality of Hall elements are difference output.
In various embodiments of the present invention, preferably, when described Hall element has temperature compensation unit, the step that the changes of magnetic field of described movable pendulum magnet detected at Hall element further comprises: the changes of magnetic field of described movable pendulum magnet at described Hall element, detected, for the variation of described movable pendulum magnets magnetic fields, carry out temperature compensation.
Should be understood that when the in use variation of temperature of a kind of reluctance force force-measuring sensing system is larger, can adopt the Hall element with temperature compensation unit, eliminate the zero shift of Hall element.
In one embodiment, as shown in Figure 1, a kind of reluctance force force-measuring sensing system comprises: spacing magnet 101, movable pendulum magnet 102, fixed rotating shaft 103, rigid lever 104, Hall element 105, operational amplifier 106.
The center of gravity place of rigid lever 104 is provided with fixed rotating shaft 103, and movable pendulum magnet 102 is fixed on measuring junction, and near measuring junction limited location magnet 101, movable pendulum magnet 102 is relative with the magnetic pole of spacing magnet 101 identical polars.Near movable pendulum magnet 101, position is useful on Hall element 105 and the operational amplifier 106 of measuring changes of magnetic field, by measuring the variation in movable pendulum magnet 102 magnetic fields, thereby calculates the size of external force.
In one embodiment, as shown in Figure 2, a kind of reluctance force force-measuring sensing method comprises the steps:
Step 201 is: when rigid lever is subject to external force and swings centered by fixed rotating shaft, movable pendulum magnet near the spacing magnet movement of a side time away from the spacing magnet of opposite side.
Should be understood that rigid lever is subject to after external force, can only in a direction, swing, for example, when rigid lever horizontal positioned, rigid lever has been subject to external force, under the effect of external force, rigid lever only can swing in the horizontal direction, can not swing at vertical direction.
Step 202 is: two spacing magnets produce repulsion to movable pendulum magnet, suppress the swing of movable pendulum magnet, until movable pendulum magnet is static.
Should be understood that the position that stops returning to for movable pendulum magnet initial movable pendulum magnet here.By two spacing magnets, suppress the swing of movable pendulum magnet, thereby make movable pendulum magnet static.
Step 203 is: four Hall elements detect respectively the changes of magnetic field of movable pendulum magnet.
Should be understood that step 202 and two steps of step 203 for carry out simultaneously.
Should be understood that and can effectively eliminate the zero point drift that Hall element is introduced.
Step 204 is: temperature compensation is carried out in the variation for movable pendulum magnets magnetic fields.
Should be understood that this step can eliminate the impact of temperature on External Force Calculation.
Step 205 is: every two Hall elements send after the signal detecting is processed by differential amplifier.
Step 206 is: the size that electric signal is calculated to external force.
A kind of reluctance force force-measuring sensing system and the method thereof that by various embodiments of the present invention, provide, can bring following beneficial effect:
By two spacing magnets being set on movable pendulum magnet side, within two spacing magnets are arranged on movable pendulum magnets magnetic fields scope, and spacing magnet is in the magnetic field range of movable pendulum magnet, spacing magnet is relative with the magnetic pole of movable pendulum magnet identical polar, when movable pendulum magnet is subject to external force swing, movable pendulum magnet approaches one of them spacing magnet, according to the principle of homopolar-repulsion, spacing magnet is to repulsion of movable pendulum magnet, suppress the swing of movable pendulum magnet, reached when movable pendulum magnet swings, system can be adjusted rapidly, suppressing movable pendulum magnet swings, when long-term use, reduced zero shift amount simultaneously,
By by fixed rotating shaft through the center of gravity of rigid lever, using center of gravity as the stressed fulcrum of rigid lever, can reach when whole sensor-based system is subject to external impacts, external force is less on the impact of reluctance force force-measuring sensing system;
By a plurality of Hall elements are set, and be connected on differential amplifier, can obtain more accurately the size of external force, reach the ability of high precision monitor; Can effectively eliminate the zero point drift that Hall element is introduced simultaneously;
By set temperature compensating unit in Hall element, in the time of can working as ambient temperature variation, reduce the impact on Hall element testing result.
Various embodiment provided by the invention combination mutually in any way as required, the technical scheme obtaining by this combination, also within the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also comprises these changes and modification interior.
Claims (10)
1. a reluctance force force-measuring sensing system, comprising: Hall element, it is characterized in that, and also comprise:
Rigid lever, it has fixed rotating shaft, force side and measuring junction, and described force side and measuring junction swing centered by described fixed rotating shaft;
Movable pendulum magnet, it is connected with the measuring junction of described rigid lever;
Two spacing magnets, two described spacing magnets are separately positioned on the both sides of described movable pendulum magnet and in the magnetic field range of described movable pendulum magnet, described spacing magnet is relative with the magnetic pole of described movable pendulum magnet identical polar;
When described rigid lever is subject to external force and swings centered by described fixed rotating shaft, described movable pendulum magnet near described in a side when spacing magnet movement away from spacing magnet described in opposite side;
Described Hall element is arranged in the magnetic field range of described movable pendulum magnet, and between described movable pendulum magnet and described spacing magnet, for detection of changes of magnetic field the output signal to described movable pendulum magnet;
Computing system, it receives described signal, and described signal is calculated to the external force size that described rigid lever is subject to.
2. a kind of reluctance force force-measuring sensing system as claimed in claim 1, is characterized in that, described fixed rotating shaft is through the center of gravity of described rigid lever.
3. a kind of reluctance force force-measuring sensing system as claimed in claim 1, is characterized in that, two described spacing magnets are identical or different.
4. a kind of reluctance force force-measuring sensing system as claimed in claim 1, is characterized in that, described movable pendulum magnet and two described spacing magnets are identical or different.
5. a kind of reluctance force force-measuring sensing system as claimed in claim 1, is characterized in that, described movable pendulum magnet and two described spacing magnets are permanent magnet or electromagnet.
6. a kind of reluctance force force-measuring sensing system as claimed in claim 1, is characterized in that, further comprises:
Differential amplifier and a plurality of described Hall element, a plurality of described Hall elements lay respectively at the both sides of described movable pendulum magnet, and between movable pendulum magnet and described spacing magnet; Every two described Hall elements are connected with a described differential amplifier jointly; Described differential amplifier receives the signal of described Hall element output and processes, and described signal is after treatment sent to described computing system;
Or
A plurality of described Hall elements and processor, described a plurality of Hall elements lay respectively at the both sides of described movable pendulum magnet, and between movable pendulum magnet and described spacing magnet; Described processor is processed the described signal of described Hall element output, and the described signal after processing is sent to described computing system.
7. a kind of reluctance force force-measuring sensing system as described in any one in claim 1-6, is characterized in that, described Hall element has temperature compensation unit.
8. a reluctance force force-measuring sensing method, described method comprises the steps:
A kind of reluctance force force-measuring sensing system of utilization as described in any one in claim 1-7;
When rigid lever is subject to external force and swings centered by fixed rotating shaft, movable pendulum magnet near the spacing magnet movement of a side time away from the spacing magnet of opposite side;
Two described spacing magnets produce repulsion to described movable pendulum magnet, suppress the swing of described movable pendulum magnet, until described movable pendulum magnet is static; Meanwhile, Hall element detects the changes of magnetic field of described movable pendulum magnet, output signal;
Described signal is calculated to the size of described external force.
9. a kind of reluctance force force-measuring sensing method as claimed in claim 8, is characterized in that,
When thering is a plurality of described Hall elements and differential amplifier, the changes of magnetic field of described movable pendulum magnet at described Hall element, detected, after the step of output signal, and before described computing system calculates the big or small step of described external force to described signal, further comprise:
A plurality of described Hall elements detect respectively the changes of magnetic field of described movable pendulum magnet, and every two described Hall elements send after the described signal detecting is processed by described differential amplifier.
10. a kind of reluctance force force-measuring sensing method as claimed in claim 8, it is characterized in that, when described Hall element has temperature compensation unit, the step that the changes of magnetic field of described movable pendulum magnet detected at Hall element further comprises: the changes of magnetic field of described movable pendulum magnet at described Hall element, detected, for the variation of described movable pendulum magnets magnetic fields, carry out temperature compensation.
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| CN106017746B (en) * | 2016-05-11 | 2018-10-02 | 哈尔滨工业大学 | Artificial fine hair-skin sensor based on ferromagnetic microfilament and its application |
| CN111505539A (en) * | 2020-05-08 | 2020-08-07 | 麦克斯(郑州)医疗科技有限公司 | Transient magnetic field measurement system |
| CN111830903A (en) * | 2020-06-16 | 2020-10-27 | 天津大学 | Absolute zero sensor applied to linear displacement table and positioning method |
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| US6670805B1 (en) * | 2000-09-22 | 2003-12-30 | Alliant Techsystems Inc. | Displacement sensor containing magnetic field sensing element between a pair of biased magnets movable as a unit |
| CN101319944A (en) * | 2007-06-08 | 2008-12-10 | 昆山市康达电子仪表有限公司 | Force transducer for on-line detecting tension force of thread type object |
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