参数资料
型号: AG003-01
厂商: NVE Corp/Sensor Products
文件页数: 126/145页
文件大小: 0K
描述: ASSEMBLY CURRENT SENSOR EVAL
标准包装: 1
传感器类型: 磁性 GMR(大型磁阻传感)
接口: 模拟
嵌入式:
已供物品: 板,CD
已用 IC / 零件: AA 系列电流传感器
相关产品: 391-1054-5-ND - SENSORS MAGNETIC FIELD LP 8-SOIC
391-1052-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1050-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1049-5-ND - SENSORS MAGNETIC FIELD 8MSOP
391-1048-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1045-5-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1032-5-ND - SENSORS MAGNETIC FIELD 8MSOP
391-1030-5-ND - SENSORS MAGNETIC FIELD 8MSOP
AB001-02-ND - SENSORS MAGNETIC FIELD 8SOIC
391-1020-5-ND - SENSORS MAGNETIC FIELD LP 8-SOIC
更多...
其它名称: 391-1004
Application Notes
Magnetic Media Detection
General discussion
GMR Magnetic Field Sensors can be used for detecting different types of magnetic media. In this
situation, NVE defines magnetic media as material that has a distinct magnetic signature. The media is
typically a non-magnetic substrate with magnetic material placed in or on the substrate. Typically,
GMR sensors are used to “read” the magnetic signature by sweeping the substrate and the sensor past
each other.
Depending upon the application, the magnetic parts of the substrate can be detected indirectly by
sensing a perturbation of an externally applied field or sensed directly due to the part’s own field. The
output of the sensor will be a function of: (1) the magnetic properties of the media; (2) the working
gap; and (3) the type of sensor used.
Application examples
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Magnetic ink detection
Magnetic stripe reading
Fine magnetic particle detection
Media magnetic signature detection
Magnetic anomaly detection in substrates
Basic concepts
For applications in which minimum size is not critical, external flux concentrators can be used to
increase sensor sensitivity. These external flux concentrators function in the same manner as the flux
concentrators within the sensor.
L gap
L concentrator
External flux concentrator
NVE
AAxxx-xx
Axis of Sensitivity
External flux concentrator
Flux concentration factor:
FC ~ L concentrator/L gap
Elongated pieces of soft magnetic material gather external magnetic flux and expose the sensor to a
magnetic field that is larger than the external magnetic field. For best results, two pieces of soft
magnetic material of the same size are used. The concentration factor is approximately the ratio of one
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www.nve.com phone: 952-829-9217 fax: 952-829-9189
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