CN103293492B - A kind of magnetic signal detection device and method - Google Patents
A kind of magnetic signal detection device and method Download PDFInfo
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- CN103293492B CN103293492B CN201210045558.2A CN201210045558A CN103293492B CN 103293492 B CN103293492 B CN 103293492B CN 201210045558 A CN201210045558 A CN 201210045558A CN 103293492 B CN103293492 B CN 103293492B
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Abstract
The invention discloses a kind of magnetic signal detection device and method. The magnetic signal detection device of the present invention includes: magnetic sensing device, detecting device; Described magnetic sensing device transmits and is transferred to described detection unit for magnetic signal is converted to the signal of telecommunication; Described detecting device is for detecting the eye pattern parameter of the described signal of telecommunication and this eye pattern parameter being compared with its threshold values preset, it is judged that whether described magnetic signal is legal. Field signal integrity during the magnetic signal detection device constraint near-field communication of the present invention, it is ensured that the decoding effect of field signal, and can interpolate that whether field signal quality of eating dishes without rice or wine closes and meet predetermined specifications form.
Description
Technical field
The present invention relates to near-field communication field, refer more particularly to a kind of magnetic signal detection dress and method.
Background technology
Mobile payment is the emerging technology and industry that occur in the market, and wherein, 2.4G mobile payment technical solution, is one of important achievement in whole mobile payment field, and this technology adopts the mode of field signal detection, it is achieved effective control of communication distance.
This field signal detection system includes signal initiator (being often referred to read write line) and signal responder (being often referred to the mobile terminal being mounted with radio-frequency unit), signal initiator sends field signal, this signal packet is containing information such as initiator's identity codes, signal responder detects this field signal intensity, and attempt decoding and then obtain the relevant information of this signal, only when field signal intensity reaches the thresholding that responder presets, and initiator and responder can correctly intercorrelation information time, initiate to activate responder just now and enter transactional stage.
But, owing to the design parameter of signal initiator is different, cause that its signal quality of eating dishes without rice or wine sent out has bigger difference, and then affect the decoding effect of signal responder, so needing the magnetic signal quality of eating dishes without rice or wine that signal initiator is sent to carry out specification so that different initiators and different responder, as long as in the specification formulated, just can reach the effect that interconnects, and the premise of specification is the quality wanting effectively to test magnetic signal.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of magnetic signal detection device and method, it is possible to effectively test out the quality of magnetic signal, so that the signal of eating dishes without rice or wine that signal initiator sends reaches predetermined specification, it is ensured that the quality of communication.
For solving above-mentioned technical problem, the present invention provides a kind of magnetic signal detection device, and its concrete technical scheme is as follows:
A kind of magnetic signal detection device, it is characterised in that include magnetic sensing device described in magnetic sensing device and detecting device and transmit and be transferred to described detecting device for magnetic signal being converted to the signal of telecommunication; Described detecting device for detect the described signal of telecommunication eye pattern parameter and by this eye pattern parameter with its preset threshold ratio relatively, it is judged that whether described magnetic signal meets predetermined cannonical format.
Further, described detecting device includes digital oscilloscope and parameter comparing unit, and described digital oscilloscope is used for receiving and show the described signal of telecommunication; Described parameter comparing unit is for reading the eye pattern parameter of the signal of telecommunication that described digital oscilloscope show, and by this eye pattern parameter with its default threshold ratio relatively, it is judged that whether described magnetic signal meets the cannonical format of reservation.
Further, described magnetic signal detection device also includes amplifying filtration module, and described amplification filtration module is for being transferred to described detecting device after the signal of telecommunication that described magnetic sensing device transmits is amplified filtering.
Further, described magnetic sensing device is hall device, magnetoresistance device, coiled wire-wound coil or printed coil.
In order to solve above-mentioned technical problem, present invention also offers a kind of magnetic signal detection method, its concrete technical scheme is as follows:
A kind of magnetic signal detection method, it is characterised in that comprise the following steps:
Magnetic sensing device sensing magnetic signal is also converted into the signal of telecommunication and is transferred to detecting device;
Detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter is whether in the preset threshold range of its correspondence;
When described eye pattern parameter is all in the preset threshold range of its correspondence, then judge that described magnetic signal closes predetermined cannonical format.
Further, described detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter whether processing procedure in the preset threshold range of its correspondence specifically includes:
Digital oscilloscope receives and shows the described signal of telecommunication;
The eye pattern parameter of the signal of telecommunication that the parameter comparing unit described digital oscilloscope of reading shows, and by this eye pattern parameter with its threshold ratio preset relatively.
Further, described detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter whether processing procedure in the preset threshold range of its correspondence specifically includes:
Determine the threshold value of the threshold value of eye opening in eye pattern parameter, eye pattern crossed dispersion degree threshold value and eye pattern degree of asymmetry;
Detecting device at least detects the eye opening of the signal of telecommunication, eye pattern crossed dispersion degree and eye pattern degree of asymmetry;
Judging that described eye opening is whether in eye opening threshold range, whether described eye pattern crossed dispersion degree is in eye pattern crossed dispersion degree threshold range, and whether described eye pattern degree of asymmetry is in the scope of eye pattern degree of asymmetry threshold value.
Further, described determine that eye opening threshold value comprises the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change eye opening, make responder's decoded bit error rate exactly marginal value, now corresponding eye opening is eye opening threshold value.
Further, described determine that eye pattern crossed dispersion degree threshold value comprises the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change cross point of eye pattern divergence, make responder's decoded bit error rate exactly marginal value, now corresponding cross point divergence is cross point divergence threshold value.
Further, described determine that eye pattern degree of asymmetry threshold value comprises the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change eye pattern degree of asymmetry, make responder's decoded bit error rate exactly marginal value, now corresponding eye pattern degree of asymmetry is the asymmetric threshold value of eye pattern.
Further, described when described eye pattern parameter is all in the preset threshold range of its correspondence, then judge that described magnetic signal meets the processing procedure of predetermined cannonical format and specifically includes:
When eye opening is not less than eye opening threshold value, eye pattern crossed dispersion degree is not more than eye pattern crossed dispersion degree threshold value, when described eye pattern degree of asymmetry is not more than eye pattern degree of asymmetry threshold value, then judges that described magnetic signal meets predetermined cannonical format.
Further, described magnetic sensing device also includes following processing procedure after sensing magnetic signal and being converted into the signal of telecommunication:
It is transferred to described detecting device after described signal of telecommunication filter amplifying processing.
The invention has the beneficial effects as follows:
Magnetic signal detection device of the present invention arranges magnetic sensing device and makes magnetic signal be converted to the signal of telecommunication to facilitate the test of magnetic signal, avoid directly testing error produced by magnetic signal, the eye pattern parameter with corresponding threshold ratio relatively of the detecting device detection signal of telecommunication is set, the integrity of magnetic signal can be tested out accurately, arrange and amplify filtration module and can make the signal of telecommunication better quality after conversion, be conducive to the collection of eye pattern parameter and whether magnetic signal quality is legal or whether magnetic signal meets the judgement of predetermined cannonical format.
Accompanying drawing explanation
Fig. 1 is a kind of magnetic signal detection device structural representation of the embodiment of the present invention one;
Fig. 2 is a kind of magnetic signal detection device structural representation of the embodiment of the present invention two;
Fig. 3 is a kind of magnetic signal detection device structural representation of the embodiment of the present invention three;
Fig. 4 is the block flow diagram of the magnetic signal detection method of the embodiment of the present invention four;
Fig. 5 is the eye pattern schematic diagram of the embodiment of the present invention four;
Fig. 6 is the eye opening schematic diagram of the embodiment of the present invention four;
Fig. 7 is the eye pattern crossed dispersion degree schematic diagram of the embodiment of the present invention four;
Fig. 8 is the eye pattern degree of asymmetry schematic diagram of the embodiment of the present invention four.
Detailed description of the invention
The present invention is described in further detail in conjunction with accompanying drawing below by detailed description of the invention.
Embodiment one:
Refer to Fig. 1, for the magnetic signal detection device of this enforcement. The magnetic signal detection device of present embodiment, including: magnetic sensing device, detecting device; Described magnetic sensing device transmits for magnetic signal is converted to the signal of telecommunication and is transferred to detecting device; Described detecting device for detect the described signal of telecommunication eye pattern parameter and by this eye pattern parameter with its preset threshold ratio relatively, it is judged that whether described magnetic signal meets predetermined cannonical format.
Magnetic signal to be measured is converted to the signal of telecommunication by Magnetic Sensor by this magnetic signal detection device, then utilizes detecting device to detect the eye pattern parameter of this signal of telecommunication, as: eye opening, eye pattern crossed dispersion degree, eye pattern degree of asymmetry, and predetermined threshold value corresponding for eye pattern parameter is compared, as: by eye opening with eye opening threshold ratio relatively, by eye pattern crossed dispersion degree with eye pattern crossed dispersion degree threshold ratio relatively, eye pattern degree of asymmetry is with eye pattern degree of asymmetry threshold ratio relatively, judge whether magnetic signal to be measured meets predetermined cannonical format, when the eye opening detected is not less than in eye opening threshold value, eye pattern crossed dispersion degree is not more than eye pattern crossed dispersion degree threshold value, when eye pattern degree of asymmetry is not more than eye pattern degree of asymmetry threshold value, then judge that magnetic signal to be measured is consistent with the cannonical format subscribed. magnetic sensing device in the magnetic signal detection device of the present embodiment can be hall device, magnetoresistance device, coiled wire-wound coil or printed coil.
Embodiment two:
As in figure 2 it is shown, be the magnetic signal detection device of the present embodiment. The present embodiment magnetic signal detection device includes: magnetic sensing device, detecting device; Described magnetic sensing device transmits for magnetic signal is converted to the signal of telecommunication and is transferred to detecting device; Described detecting device for detect the described signal of telecommunication eye pattern parameter and by this eye pattern parameter with its preset threshold ratio relatively, it is judged that described magnetic signal meets predetermined cannonical format; Wherein said detecting device includes digital oscilloscope and parameter comparing unit, and described digital oscilloscope is used for receiving and show the described signal of telecommunication; Described parameter comparing unit is for reading the eye pattern parameter of the signal of telecommunication that described digital oscilloscope show, and by this eye pattern parameter with its default threshold ratio relatively, it is judged that whether magnetic signal to be measured meets the cannonical format of reservation.
Magnetic signal to be measured is converted to the signal of telecommunication by Magnetic Sensor by this magnetic signal detection device, it is then transferred to digital oscilloscope and shows its eye pattern parameter, as: eye opening, eye pattern crossed dispersion degree, eye pattern degree of asymmetry etc., now parameter comparing unit obtains the eye pattern parameter in digital oscilloscope and predetermined threshold value corresponding for eye pattern parameter is compared, as parameter comparing unit obtains eye opening from digital oscilloscope, eye pattern crossed dispersion degree, eye pattern degree of asymmetry, then by eye opening with eye opening threshold ratio relatively, by eye pattern crossed dispersion degree with eye pattern crossed dispersion degree threshold ratio relatively, eye pattern degree of asymmetry is with eye pattern degree of asymmetry threshold ratio relatively. if the eye pattern parameter detected is all in its preset threshold range, judge that magnetic signal to be measured is consistent with predetermined cannonical format, as be not less than when the eye opening detected be not more than eye pattern crossed dispersion degree threshold value in eye opening threshold value, eye pattern crossed dispersion degree, eye pattern degree of asymmetry be not more than eye pattern degree of asymmetry threshold value time, then judge that magnetic signal to be measured is consistent with the cannonical format subscribed. magnetic sensing device in the magnetic signal detection device of the present embodiment can be hall device, magnetoresistance device, coiled wire-wound coil or printed coil
Embodiment three:
As shown in Figure 3, on the magnetic signal detection device basis of embodiment one and embodiment two, the magnetic signal detection device of the present embodiment can also include amplifying filtration module, for being transferred to described detecting device after the signal of telecommunication that described magnetic sensing device transmits is amplified filtering. Telecommunications can be collected after amplifying Filtering Processing the eye pattern parameter of this shop signal, thus judging whether magnetic signal to be measured meets predetermined cannonical format accurately accurately. Magnetic sensing device in the magnetic signal detection device of the present embodiment can be hall device, magnetoresistance device, coiled wire-wound coil or printed coil.
Embodiment four:
As shown in Figure 4, the magnetic signal detection method of present embodiment, comprise the following steps:
Magnetic sensing device sensing magnetic signal is also converted into the signal of telecommunication and is transferred to detecting device;
Detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter is whether in the preset threshold range of its correspondence;
When described eye pattern parameter is all in the preset threshold range of its correspondence, then judge that described magnetic signal meets predetermined cannonical format.
In the magnetic signal detection method of the present embodiment, detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter whether processing procedure in the preset threshold range of its correspondence specifically includes:
Digital oscilloscope receives and shows the described signal of telecommunication;
The eye pattern parameter of the signal of telecommunication that the parameter comparing unit described digital oscilloscope of reading shows, and by this eye pattern parameter with its threshold ratio preset relatively.
In the present embodiment magnetic signal detection method, detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter whether processing procedure in the preset threshold range of its correspondence specifically includes:
Determine the threshold value of the threshold value of eye opening in eye pattern parameter, eye pattern crossed dispersion degree threshold value and eye pattern degree of asymmetry;
Detecting device at least detects the eye opening of the signal of telecommunication, eye pattern crossed dispersion degree and eye pattern degree of asymmetry;
Judging that described eye opening is whether in eye opening threshold range, whether described eye pattern crossed dispersion degree is in eye pattern crossed dispersion degree threshold range, and whether described eye pattern degree of asymmetry is in the scope of eye pattern degree of asymmetry threshold value.
Eye opening threshold value in the magnetic signal detection method of this example, eye pattern crossed dispersion degree threshold value, eye pattern degree of asymmetry threshold value these three predetermined threshold value determination comprise the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change eye opening, make responder's decoded bit error rate exactly marginal value, now corresponding eye opening is eye opening threshold value;
Arranging magnetic signal initiator parameters, change cross point of eye pattern divergence, make responder's decoded bit error rate exactly marginal value, now corresponding cross point divergence is cross point divergence threshold value;
Arranging magnetic signal initiator parameters, change eye pattern degree of asymmetry, make responder's decoded bit error rate exactly marginal value, now corresponding eye pattern degree of asymmetry is the asymmetric threshold value of eye pattern.
In the magnetic signal detection method of the present embodiment, magnetic sensing device also includes following processing procedure after sensing magnetic signal and being converted into the signal of telecommunication:
It is transferred to described detecting device after described signal of telecommunication filter amplifying processing.
When described eye pattern parameter is all in the preset threshold range of its correspondence in above magnetic signal detection method, then judge that described magnetic signal meets the processing procedure of predetermined cannonical format and specifically includes:
When described eye pattern parameter is all in the preset threshold range of its correspondence, then judge that described magnetic signal meets the processing procedure of predetermined cannonical format and specifically includes:
When eye opening is not less than eye opening threshold value, eye pattern crossed dispersion degree is not more than eye pattern crossed dispersion degree threshold value, when described eye pattern degree of asymmetry is not more than eye pattern degree of asymmetry threshold value, then judges that described magnetic signal meets predetermined cannonical format.
Single or multiple eye pattern parameters can be tested by the magnetic signal detection method of the present embodiment and compare with corresponding predetermined threshold value according to the eye pattern parameter detected. Detect more many eye pattern parameters and more can detect whether magnetic signal to be measured meets predetermined cannonical format accurately. When detecting multiple eye pattern parameter in the process that eye pattern parameter and predetermined threshold value judge, it is possible to set the several parameters in multiple parameter in preset threshold range, then judge that magnetic signal is consistent with predetermined cannonical format; Can also set when the eye pattern parameter of detection all just can determine whether in the predetermined threshold value of its correspondence that magnetic signal is consistent with predetermined cannonical format; Certain the latter's judge process is more accurate.
The following is detailed description magnetic signal detection method of the present invention on above-mentioned basis:
Step one, detecting, with Magnetic Sensor, the field signal that magnetic signal initiator to be measured sends, Magnetic Sensor is gathered by digital oscilloscope after converting magnetic signal to the signal of telecommunication and shows;
Step 2, to arrange digital oscilloscope be sunset glow pattern, reads the signal eye diagram that digital oscilloscope collects, and measures eye opening k, cross point divergence tj and eye pattern degree of asymmetry tr, tf and trf respectively, eye pattern as shown in Figure 4, through measuring, U++U-=4V, 2��U=1V, passes through formulaCalculate eye opening k=75%; Through measuring, tj=50us, so cross point divergence tj=50us; Through measuring, tr=15us, tf=20us, so, eye pattern degree of asymmetry trf=| tr-tf|=5us.
The eye pattern parametric results of above-mentioned measurement and calculating is compared by step 3, parameter comparing unit with the parameter threshold preset, and in threshold range, then initiator to be measured is qualified, and not in threshold range, then initiator to be measured is defective. Concrete comparison procedure is as follows:
As it is shown in figure 5, the eye opening threshold value corresponding when the bit error rate is BER0=95% isSo the eye opening in example above is 75% > 50%, meet threshold range;
As shown in Figure 6, corresponding when the bit error rate is BER0=95% cross point divergence threshold value is tj0=60us, so above-mentioned cross point of eye pattern divergence is 50us < 60us, meets threshold range;
As it is shown in fig. 7, the eye pattern rise time t corresponding when the bit error rate is BER0=95%r=20us, fall time tf=30us, rise time and difference t fall timerf0=10us, so the eye pattern degree of asymmetry threshold value respectively t of correspondencerf0=10us, so the eye pattern degree of asymmetry parameter t in examples detailed aboverf=| tr-tf|=5us < 10us, meet threshold range;
The eye pattern parameter detected in sum, all in preset threshold range, can determine that magnetic signal to be measured is consistent with predetermined cannonical format.
Above content is in conjunction with specific embodiment further description made for the present invention, it is impossible to assert that specific embodiment of the invention is confined to these explanations. For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, protection scope of the present invention all should be considered as belonging to.
Claims (12)
1. a magnetic signal detection device, it is characterised in that include magnetic sensing device described in magnetic sensing device and detecting device for the magnetic signal that signal initiator sends being converted to the signal of telecommunication and being transferred to described detecting device; Described detecting device for detect the described signal of telecommunication eye pattern parameter and by this eye pattern parameter with its preset threshold ratio relatively, it is judged that whether described magnetic signal meets predetermined cannonical format.
2. magnetic signal detection device as claimed in claim 1, it is characterised in that described detecting device includes digital oscilloscope and parameter comparing unit, and described digital oscilloscope is used for receiving and show the described signal of telecommunication; Described parameter comparing unit is for reading the eye pattern parameter of the signal of telecommunication that described digital oscilloscope show, and by this eye pattern parameter with its default threshold ratio relatively, it is judged that whether described magnetic signal meets the cannonical format of reservation.
3. magnetic signal detection device as claimed in claim 1 or 2, it is characterised in that also including amplifying filtration module, described amplification filtration module is for being transferred to described detecting device after the signal of telecommunication that described magnetic sensing device transmits is amplified filtering.
4. magnetic signal detection device as claimed in claim 1 or 2, it is characterised in that described magnetic sensing device is hall device, magnetoresistance device, coiled wire-wound coil or printed coil.
5. a magnetic signal detection method, it is characterised in that comprise the following steps:
Magnetic signal that magnetic sensing device induced signal initiator sends also is converted into the signal of telecommunication and is transferred to detecting device;
Detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter is whether in the preset threshold range of its correspondence;
When described eye pattern parameter is all in the preset threshold range of its correspondence, then judge that described magnetic signal meets predetermined cannonical format.
6. magnetic signal detection method as claimed in claim 5, it is characterised in that described detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter whether processing procedure in the preset threshold range of its correspondence specifically includes:
Digital oscilloscope receives and shows the described signal of telecommunication;
The eye pattern parameter of the signal of telecommunication that the parameter comparing unit described digital oscilloscope of reading shows, and by this eye pattern parameter with its threshold ratio preset relatively.
7. magnetic signal detection method as claimed in claim 5, it is characterised in that
Described detecting device detects the eye pattern parameter of the described signal of telecommunication and judges that this eye pattern parameter whether processing procedure in the preset threshold range of its correspondence specifically includes:
Determine the threshold value of the threshold value of eye opening in eye pattern parameter, eye pattern crossed dispersion degree threshold value and eye pattern degree of asymmetry;
Detecting device at least detects the eye opening of the signal of telecommunication, eye pattern crossed dispersion degree and eye pattern degree of asymmetry;
Judging that described eye opening is whether in eye opening threshold range, whether described eye pattern crossed dispersion degree is in eye pattern crossed dispersion degree threshold range, and whether described eye pattern degree of asymmetry is in the scope of eye pattern degree of asymmetry threshold value.
8. the magnetic signal detection method as shown in claim 7, it is characterised in that described determine that eye opening threshold value comprises the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change eye opening, make responder's decoded bit error rate exactly marginal value, now corresponding eye opening is eye opening threshold value.
9. magnetic signal detection method as claimed in claim 7, it is characterised in that described determine that eye pattern crossed dispersion degree threshold value comprises the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change cross point of eye pattern divergence, make responder's decoded bit error rate exactly marginal value, now corresponding cross point divergence is cross point divergence threshold value.
10. magnetic signal detection method as claimed in claim 7, it is characterised in that described determine that eye pattern degree of asymmetry threshold value comprises the following steps:
The configurable magnetic signal initiator of parameter is set, chooses some responders and detect the magnetic signal that this magnetic signal initiator sends, attempt decoding, and judge its bit error rate;
Arranging magnetic signal initiator parameters, change eye pattern degree of asymmetry, make responder's decoded bit error rate exactly marginal value, now corresponding eye pattern degree of asymmetry is the asymmetric threshold value of eye pattern.
11. magnetic signal detection method as claimed in claim 7, it is characterised in that described when described eye pattern parameter is all in the preset threshold range of its correspondence, then judge that described magnetic signal meets the processing procedure of predetermined cannonical format and specifically includes:
When eye opening is not less than eye opening threshold value, eye pattern crossed dispersion degree is not more than eye pattern crossed dispersion degree threshold value, when described eye pattern degree of asymmetry is not more than eye pattern degree of asymmetry threshold value, then judges that described magnetic signal meets predetermined cannonical format.
12. the magnetic signal detection method as described in any one of claim 5-11, it is characterised in that described magnetic sensing device sensing magnetic signal also also includes following processing procedure after being converted into the signal of telecommunication:
It is transferred to described detecting device after described signal of telecommunication filter amplifying processing.
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| CN101170324A (en) * | 2007-11-19 | 2008-04-30 | 中兴通讯股份有限公司 | Testing system and testing method of near-field communication device |
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| CN202083973U (en) * | 2011-05-20 | 2011-12-21 | 北京航空航天大学 | Current biasing circuit used for magnetic sensor |
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| CN102132168B (en) * | 2008-09-29 | 2013-07-24 | 欧姆龙株式会社 | Magnetic field detection element and signal transmission element |
| JP4936030B2 (en) * | 2010-03-10 | 2012-05-23 | Ｔｄｋ株式会社 | Magnetic sensor |
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| US6107793A (en) * | 1997-02-10 | 2000-08-22 | Mitsubishi Denki Kabushiki Kaisha | Magnetic sensing device unaffected by positioning error of magnetic field sensing elements |
| CN101170324A (en) * | 2007-11-19 | 2008-04-30 | 中兴通讯股份有限公司 | Testing system and testing method of near-field communication device |
| CN101672823A (en) * | 2009-10-15 | 2010-03-17 | 中钞特种防伪科技有限公司 | System and method for the online detection of magnetic materials |
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