参数资料
型号: 12217
厂商: NVE Corp/Sensor Products
文件页数: 94/145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 Field Sensors (Magnetometers)
The NVE standard line of magnetic field sensors use a unique configuration employing a Wheatstone
bridge of resistors and various forms of flux shields and concentrators. Using magnetic materials for
shielding eliminates the need for a bias field with GMR sensors. NVE has developed a process to
plates a thick layer of magnetic material on the sensor substrate. This layer forms a shield over the
GMR resistors underneath, essentially conducting any applied magnetic field away from the shielded
resistors. The configuration allows two resistors (opposite legs of the bridge) to be exposed to the
magnetic field. The other two resistors are located under the plated magnetic material, effectively
shielding them from the external applied magnetic field. When the external field is applied, the
exposed resistors decrease in electrical resistance while the other resistor pair remain unchanged,
causing a signal output at the bridge terminals.
The plating process developed by NVE for use in GMR sensor applications has another benefit: it
allows flux concentrators to be deposited on the substrate. These flux concentrators increase the
sensitivity of the raw GMR material by a factor of 2 to 100. The flux concentration factor is roughly
equivalent to the length of one shield divided by the length of the gap. This allows use of GMR
materials that saturate at higher fields. For example, to sense a field from 0 to 100 Oersteds, NVE
deposits a GMR sensor that saturates at a nominal 300 Oersteds and flux concentrators with a
magnification factor of three. The figure below shows the basic layout of the device:
Axis of sensitivity
Silicon substrate
(1300 μ m x 400 μ m)
Gap
Flux concentrator (2)
Metal interconnects
Magnetically shielded resistor (2)
Bonding pads (4)
(100 μ m x 100 μ m)
Magnetically active resistor pair
T YPICAL GMR M AGNETIC F IELD S ENSOR L AYOUT
- 94 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
相关PDF资料
PDF描述
B512-2T-YDA MOD DIODE SCR 25A 240VAC .250"QC
HAL 200-S CURRENT TRANSDUCERS 200A 15V
B553-2 MOD DIODE SCR 25A 280VAC ISO QC
B511F-2 MOD DIODE SCR 25A 120VAC ISO QC
HAL 50-S CURRENT TRANSDUCERS 50A 15V
相关代理商/技术参数
参数描述
122170 制造商:Amphenol Connex 功能描述:TNC BLKHD CRMP JCK RG59-50--TF - Bag
1-22170-6 制造商:TE Connectivity 功能描述:PIN,COTTER - Bulk 制造商:TE CONNECTIVITY 功能描述:PIN,COTTER
1-22170-8 制造商:TE Connectivity 功能描述:PIN,COTTER - Bulk 制造商:TE CONNECTIVITY 功能描述:PIN,COTTER
1-2217206-0 功能描述:BLADE, SLUG 制造商:te connectivity amp connectors 系列:* 零件状态:有效 标准包装:1
1-2217206-1 功能描述:BLADE, SLUG 制造商:te connectivity amp connectors 系列:* 零件状态:有效 标准包装:1