Assignee: JENTEK Sensors, Inc.

Location: Waltham, MA
No. of patents: 24

Number	Title	Issue Date
7876094	Magnetic field characterization of stresses and properties in materials Described are methods for monitoring of stresses and other material properties. These methods use measurements of effective electrical properties, such as magnetic permeability and electrical conductivity, to infer the state of the test material, such as the stress,...	01/25/2011
7812601	Material condition assessment with eddy current sensors Eddy current sensors and sensor arrays are used for process quality and material condition assessment of conducting materials. In an embodiment, changes in spatially registered high resolution images taken before and after cold work processing reflect the quality of...	10/12/2010
7696748	Absolute property measurements using electromagnetic sensors Methods and apparatus are described for absolute electrical property measurement of materials. This is accomplished with magnetic and electric field based sensors and sensor array geometries that can be modeled accurately and with impedance instrumentation that perm...	04/13/2010
7589526	Surface mounted sensor arrays having segmented primary windings One of the issues with planar eddy-current sensors is the placement of the current return for the primary winding. Often the ends of the primary winding are spatially distant from one another, which creates an extraneous and large inductive loop that can influence t...	09/15/2009
7533575	Quasistatic magnetic and electric field stress/strain gages Magnetic or electric field sensors are mounted against a material surface and used for stress, strain, and load monitoring of rotating components such as vehicle drive trains. The stationary sensors are mounted at multiple locations around the component and used ass...	05/19/2009
7528598	Fastener and fitting based sensing methods Damage and usage conditions in the vicinity of fasteners in joined structures are nondestructively evaluated using the fasteners themselves. Sensors or sensor conductors are embedded in the fasteners or integrated within the fastener construct, either in the clearan...	05/05/2009
7526964	Applied and residual stress measurements using magnetic field sensors Methods are described for the use of conformable eddy-current sensors and sensor arrays for characterizing residual stresses and applied loads in materials. In addition, for magnetizable materials such as steels, these methods can be used to determine carbide conten...	05/05/2009
7518360	Hybrid wound/etched winding constructs for scanning and monitoring Combined wound and micro-fabricated winding constructs are described for the inspection of materials and the detection and characterization of hidden features or flaws. These constructs can be configured as sensors or sensor arrays that are surface mounted or scanne...	04/14/2009
7467057	Material property estimation using non-orthogonal responsive databases Precomputed databases of sensor responses are used to convert measurement data into properties of interest, for example, conductivity or lift-off. These databases of responses may be generated prior to data acquisition and provide sensor response values that span ap...	12/16/2008
7451657	Material condition monitoring with multiple sensing modes Methods are described for assessing material condition. These methods include the use of multiple source fields for interrogating and loading of a multicomponent test material. Source fields include electric, magnetic, thermal, and acoustic fields. The loading field...	11/18/2008
7451639	Engine blade dovetail inspection A set of curved components, such as the dovetail region of engine blades, are inspected by mounting each component into a circular carousel in a vertical orientation and rotating the carousel to move each component toward and away from an inspection site. The inspec...	11/18/2008
7411390	High resolution inductive sensor arrays for UXO For the inspection of materials and the detection and characterization of hidden objects, features, or flaws sensors and sensor arrays are used to image form two-dimensional images suitable for characterizing the hidden features. Magnetic field or eddy current based...	08/12/2008
7385392	Eddy current sensing arrays and system An apparatus that measures electrical impedance. The apparatus includes a signal generator controlled by a master microcontroller, a plurality of data acquisition channels, each channel containing a microcontroller, a host computer that processes and stores measured...	06/10/2008
7348771	Method for verifying sensor condition Sensor condition verification may be performed on electromagnetic sensors and sensor arrays mounted to a material surface. The sensors typically have a periodic winding or electrode structure that creates a periodic sensing field when driven by an electrical signal....	03/25/2008
7289913	Local feature characterization using quasistatic electromagnetic sensors Local features such as cracks in materials are nondestructively characterized by measuring a response with an electromagnetic sensor and converting this response into a selected property using a database. The database is generated prior to data acquisition by using ...	10/30/2007
7280940	Segmented field dielectric sensor array for material characterization The condition of insulating and semiconducting dielectric materials is assessed by a sensor array that uses electric fields to interrogate the test material. The sensor has a linear array of parallel drive conductors interconnected to form a single drive electrode a...	10/09/2007
7230421	Damage standard fabrication with attached sensor Reference standards or articles having prescribed levels of damage are fabricated by monitoring an electrical property of the article material, mechanically loading the article, and removing the load when a change in electrical properties indicates a prescribed leve...	06/12/2007
7183764	Method for inspecting a channel using a flexible sensor Described are methods for pressurizing elastic support structures or balloons in sensor probes used for the inspection of components having areas of limited access. When inflated, the balloons press flexible sensors against the surface of the material under test. Wh...	02/27/2007
7049811	Test circuit having parallel drive segments and a plurality of sense elements A test circuit having a drive winding with parallel conducting segments and a plurality of sense elements used for the nondestructive measurement of materials. The drive winding segments have extended portions and are driven by a time varying electric current to imp...	05/23/2006
6995557	High resolution inductive sensor arrays for material and defect characterization of welds A sensor that characterizes welds in materials. The sensor includes a meandering drive winding with at least three extended portions and at least one sensing element placed between an adjacent pair of extended portions. A time varying electric current is passed thro...	02/07/2006
6952095	Surface mounted and scanning spatially periodic eddy-current sensor arrays Inductive sensors measure the near surface properties of conducting and magnetic material. A sensor may have primary windings with parallel extended winding segments to impose a spatially periodic magnetic field in a test material. Those extended portions may be for...	10/04/2005
6798198	Fluid supports for sensors Pressurized elastic support structures or balloons are used to press flexible sensors against the surface a material under test. Rigid support elements can also be incorporated into the inspection devices to maintain the basic shape of the inspection structure and t...	09/28/2004
6657429	Material condition assessment with spatially periodic field sensors Inductive sensors measure the near surface properties of conducting magnetic materials. The sensors generally include parallel winding segments to induce a spatially periodic magnetic field in a material under test. The sensors may provide a directionally...	12/02/2003
6198279	Test material analysis using offset scanning meandering windings A meandering winding magnetometer (MWM) includes a meandering primary winding and at least one sensing winding or coil on a membrane to be pressed against a test surface. The membrane may be supported on a flexible carrier which is translatable into a pro...	03/06/2001

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Assignee: JENTEK Sensors, Inc.