Invention Grant
US08222897B2 Test circuit with sense elements having associated and unassociated primary windings
有权
具有感应元件的测试电路具有相关联和未相关的初级绕组
- Patent Title: Test circuit with sense elements having associated and unassociated primary windings
- Patent Title (中): 具有感应元件的测试电路具有相关联和未相关的初级绕组
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Application No.: US12157719Application Date: 2008-06-12
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Publication No.: US08222897B2Publication Date: 2012-07-17
- Inventor: Yanko K. Sheiretov , Neil J. Goldfine , Todd M. Dunford , Scott A. Denenberg , David C. Grundy , Darrell E. Schlicker , Andrew P. Washabaugh , Karen E. Walrath
- Applicant: Yanko K. Sheiretov , Neil J. Goldfine , Todd M. Dunford , Scott A. Denenberg , David C. Grundy , Darrell E. Schlicker , Andrew P. Washabaugh , Karen E. Walrath
- Applicant Address: US MA Waltham
- Assignee: JENTEK Sensors, Inc.
- Current Assignee: JENTEK Sensors, Inc.
- Current Assignee Address: US MA Waltham
- Agency: Hamilton, Brook, Smith & Reynolds, P.C.
- Main IPC: G01R33/12
- IPC: G01R33/12 ; G01N27/72 ; G01N27/90 ; G01B7/24

Abstract:
An apparatus for the nondestructive measurement of materials that includes at least two layers of electrical conductors. Within each layer, a meandering primary winding is used to create a magnetic field for interrogating a test material while sense elements or conducting loops within each meander provide a directional measurement of the test material condition in different orientations without requiring movement of the test circuit or apparatus. In a bidirectional implementation the meanders are oriented 90° apart while in a quadridirectional implementation the meanders are orientated at −45, 0, 45, and 90°. Multidirectional permeability measurements are used to assess the stress or torque on a component. These measurements are combined in a manner that removes temperature effects and hysteresis on the property measurements. This can be accomplished through a correction factor that accounts for the temperature dependence. After the correction, the permeability measurement is then used to assess the local stresses and strains in the material of interest.
Public/Granted literature
- US20090001974A1 Torque and load monitoring using magnetic sensor arrays Public/Granted day:2009-01-01
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