Other

B.p.w., Inc.

Polymer Aging Concepts Inc.

Shelby J Morris

Kenneth S Watkins, Jr

Shijian Luo

Daniel D Masakowski

Ching Ping Wong

Ralph E Pope

Ching-Ping Wong

An in-situ method for monitoring the health of a composite component utilizes a condition sensor made of electrically conductive particles dispersed in a polymeric matrix. The sensor is bonded or otherwise formed on the matrix surface of the composite material. Age-related shrinkage of the sensor matrix results in a decrease in the resistivity of the condition sensor. Correlation of measured sensor resistivity with data from aged specimens allows indirect determination of mechanical damage and remaining age of the composite component.

Health monitoring method for composite materials

An electrical condition monitoring method utilizes measurement of electrical resistivity of a conductive composite degradation sensor to monitor environmentally induced degradation of a polymeric product such as insulated wire and cable. The degradation sensor comprises a polymeric matrix and conductive filler. The polymeric matrix may be a polymer used in the product, or it may be a polymer with degradation properties similar to that of a polymer used in the product. The method comprises a means for communicating the resistivity to a measuring instrument and a means to correlate resistivity of the degradation sensor with environmentally induced degradation of the product.

Electrical condition monitoring method for polymers

An environmental degradation sensor for environmentally sensitive products such as food, pharmaceuticals or cosmetic products provides the degraded state and estimated remaining life of the product. The sensor is made of a polymeric matrix and conductive filler. A control agent, selected to adjust a reaction rate of the sensor to environmental conditions, allows correlation of an electrical property of the sensor to a degraded state of the product. The sensor may be integrated with a passive RFID to provide product identification and degradation status wirelessly via reader. The sensor improves product safety, reduces cost of premature product disposal and, combined with RFIDs, improves the security of products through combined product degradation monitoring and tracking.

Electrical sensor for monitoring degradation of products from environmental stressors

An electrical condition monitoring method utilizes measurement of electrical resistivity of an age sensor made of a conductive matrix or composite disposed in a polymeric structure such as an electrical cable. The conductive matrix comprises a base polymer and conductive filler. The method includes communicating the resistivity to a measuring instrument and correlating resistivity of the conductive matrix of the polymeric structure with resistivity of an accelerated-aged conductive composite.

A fault sensing electrical wire ( ) utilized one or more sensor strips ( ) which provide an impedance change when the wire is subject to an overtemperature condition or mechanical damage of the wire. A control unit ( ) measures the impedance of the sensor strips of the fault sensing wire and provides a control signal ( ) to initiate an alarm or protective action based on the severity of the condition. The control unit ( ) may monitor a number of fault sensing sires simultaneously or in sequence. The apparatus may be used to sense an electrical arc occurring in the insulation of the wire.

Fault sensing wire and alarm apparatus

An optical fiber sensor, disposed in the insulation of a wire or cable, provides a means of detecting damage to the insulation of the wire or cable. An optical measurement device, such as an optical time domain reflectometer (OTDR), coupled to the sensor, detects the presence and location of a sensor fault or stress. The sensor is positioned between the conductor and the outside surface of the conductor so that the OTDR will sense damage before the conductor is exposed or contacted by a damage element.

Fiber optic damage sensor for wire and cable

A fault sensing electrical wire ( ) utilizes one or more sensor strips ( ) which provide an impedance change when the wire is subject to an overtemperature condition or mechanical damage of the wire. A control unit ( ) measures the impedance of the sensor strips of the fault sensing wire and provides a control signal ( ) to initiate an alarm or protective action based on the severity of the condition. The control unit ( ) may monitor a number of fault sensing wires simultaneously or in sequence. The apparatus may be used to sense an electrical arc occurring in the insulation of the wire.

An electrical safety device comprises a sensor strip disposed in the insulation of a wire or in the insulation of a sheath enclosing a bundle of insulated electrical conductors. The sensor strip comprises a distributed overtemperature sensing portion comprising a conductive polymer having a positive temperature coefficient of resistivity which increases with temperature sufficient to result in a switching temperature. A mechanical damage sensing portion comprises a strip disposed in the sheath in a mechanical damage sensing pattern which becomes damaged or open upon mechanical damage of the sheath before the bundle of conductors are damaged. The overtemperature sensing portion and the mechanical damage sensing portion may be the same sensing strip disposed in the sheath and arranged in a helical relationship with a longitudinal axis of the sheath.

Electrical safety device with conductive polymer sensor

An electrical safety device comprises a sensor strip disposed in the insulation of an electrical power cord or other electrical apparatus. The sensor strip is made of a conductive polymer with a positive temperature coefficient of resistivity which increases with temperature. The sensor strip forms a series connected loop connected to an impedance measuring circuit. A relay interrupts current to the conductors of the cord when the impedance of the sensor strip increases due to an overtemperature condition. The sensor strip is positioned between the conductors of the cord and the outside surface of the cord. The position of the sensor strip allows the strip to act as a mechanical damage sensor, opening the series connected loop before an energized conductor is exposed.

Growing community of inventors

Hampton, VA, United States of America

Shelby J Morris