参数资料
型号: 12217
厂商: NVE Corp/Sensor Products
文件页数: 96/145页
文件大小: 0K
描述: MAGNET 3.5MM DIA X 4MM THICK
标准包装: 10
系列: *
其它名称: Q7078272A
Application Notes
GMR Magnetic Gradient Sensors (Gradiometers)
The NVE gradiometer is a GMR magnetic field sensor used to detect field gradients between
Wheatstone bridge configured resistors. This device is “unshielded” ( i.e. , it does not employ resistor
shields) therefore all four (4) legs of the Wheatstone bridge are active (they respond to changes in field
level). Gradiometers can be used to detect either magnetic or ferrous targets. To detect gradient
changes caused by the proximity to a moving ferrous target, a biasing magnet is required. Refer to the
Magnetic Biasing section and the GT Sensor application notes for gradiometer biasing guidelines.
The output of the gradiometer differs from that of a standard GMR Magnetic Field Sensor. The
gradiometer’s output can be bipolar versus unipolar and can be shaped by the use of magnetic biasing
and the application of external flux shaping devices (flux guides). The figure below shows an example
design:
Axis of sensitivity
Silicon substrate
Active resistor pairs
Metal interconnects
(1250 μ m x 650 μ m)
Unused resistor pairs
Bonding pads (4)
(100 μ m x 100 μ m)
(different resistor spacing may be
incorporated based on application)
B ASIC G RADIOMETER B RIDGE S ENSOR L AYOUT
- 96 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
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