Abstract: A wireless remote sensor (110) that is powered by an inductive transmitter (112) and is configured to produce an oscillating wave that varies based on one or more sensed parameters. The oscillating wave is communicated to the inductive transmitter (112) by reflected impedance, where it can be detected to determine the sensed value(s). In another aspect, the present invention provides a wireless remote sensor with a Wheatstone bridge arrangement having an internal resonant circuit to produce an electromagnetic field indicative of the sensed value. In a third aspect, the present invention provides a wireless remote sensor with optical feedback from a reference circuit and a sensor circuit. In a fourth aspect, the present invention provides a wireless remote temperature sensor having coils printed on a material with a high coefficient of thermal expansion so that the size and/or shape of the coils varies as the temperature increases or decreases.

Abstract: A wireless power transfer system with a remote device having a communication transmitter configured to initiate communications with a framing pulse to prevent noise from being mistaken for legitimate data. The communication system may employ a bi-phase modulation scheme, and the framing pulse may be generated to present no transitions in the communication signal during a specified period of time. The communication transmitter may produce the framing pulse by applying a load in the remote device. The present invention also provides a method for transmitting communication signals in a wireless power supply system including the general steps of: (a) preceding each communication with a framing pulse configured to present a bit sequence that does not exist in legitimate data communications, (b) maintaining the framing pulse for a period of time sufficient to effectively “reset” the communications receiver and (c) transmitting communications following the framing pulse.

Abstract: A wireless remote sensor (110) that is powered by an inductive transmitter (112) and is configured to produce an oscillating wave that varies based on one or more sensed parameters. The oscillating wave is communicated to the inductive transmitter (112) by reflected impedance, where it can be detected to determine the sensed value(s). In another aspect, the present invention provides a wireless remote sensor with a Wheatstone bridge arrangement having an internal resonant circuit to produce an electromagnetic field indicative of the sensed value. In a third aspect, the present invention provides a wireless remote sensor with optical feedback from a reference circuit and a sensor circuit. In a fourth aspect, the present invention provides a wireless remote temperature sensor having coils printed on a material with a high coefficient of thermal expansion so that the size and/or shape of the coils varies as the temperature increases or decreases.

Abstract: A wireless power transfer system with a remote device having a communication transmitter configured to initiate communications with a framing pulse to prevent noise from being mistaken for legitimate data. The communication system may employ a bi-phase modulation scheme, and the framing pulse may be generated to present no transitions in the communication signal during a specified period of time. The communication transmitter may produce the framing pulse by applying a load in the remote device. The present invention also provides a method for transmitting communication signals in a wireless power supply system including the general steps of: (a) preceding each communication with a framing pulse configured to present a bit sequence that does not exist in legitimate data communications, (b) maintaining the framing pulse for a period of time sufficient to effectively “reset” the communications receiver and (c) transmitting communications following the framing pulse.

Abstract: A conveyor system and method of measuring chain wear includes first and second sensing devices positioned at a conveyor line or path and directed toward a conveyor chain that is movable along the conveyor path. The first sensing device senses the presence of a first chain portion of the conveyor chain at a predetermined location as the conveyor chain moves along the conveyor line. The second sensing device senses a second chain portion of the conveyor chain as the conveyor chain moves along the conveyor line. The second sensing device is operable to sense a location of or distance to the second chain portion or may capture an image of the second portion. A controller is operable to determine a degree of wear of a section of chain extending between the first and second chain portions in response to the second sensing device.

Abstract: A conveyor system and method of measuring chain wear includes first and second sensing devices positioned at a conveyor line or path and directed toward a conveyor chain that is movable along the conveyor path. The first sensing device senses the presence of a first chain portion of the conveyor chain at a predetermined location as the conveyor chain moves along the conveyor line. The second sensing device senses a second chain portion of the conveyor chain as the conveyor chain moves along the conveyor line. The second sensing device is operable to sense a location of or distance to the second chain portion or may capture an image of the second portion. A controller is operable to determine a degree of wear of a section of chain extending between the first and second chain portions in response to the second sensing device.