Methods and systems provide for detecting tampering of a fuel dispenser. Power is applied to a valve coil of a fuel dispenser. The valve coil is part of a control valve configured to accomplish a gradated fuel flow of the fuel dispenser. Current flowing through the valve coil is measured in response to the power being applied to the valve coil. The current measurements are compared with predetermined criteria and tampering with the valve coil is determined if the current measurements are sufficiently different than expected.

A sensor system includes one or more rotor antennas on a shaft that moves within a stator bracket one or more of around an axis of the sensor system or along the axis of the sensor system, the one or more rotor antennas configured to communicate sensed data with one or more stator antennas on the stator bracket. Each rotor antenna has a rotor signal trace disposed on an outer rotor side of a dielectric substrate of the rotor antenna and a rotor return trace disposed on the outer rotor side of the dielectric substrate, wherein the rotor signal trace and the rotor return trace are not concentric with respect to each other. The one or more rotor antennas are configured to extend one or more of radially around an outer surface of the shaft of a sensor or along the outer surface of the shaft of the sensor.

A sensor system includes one or more rotor antennas on a shaft that moves within a stator bracket one or more of around an axis of the sensor system or along the axis of the sensor system, the one or more rotor antennas configured to communicate sensed data with one or more stator antennas on the stator bracket. Each rotor antenna has a rotor signal trace disposed on an outer rotor side of a dielectric substrate of the rotor antenna and a rotor return trace disposed on the outer rotor side of the dielectric substrate, wherein the rotor signal trace and the rotor return trace are not concentric with respect to each other. The one or more rotor antennas are configured to extend one or more of radially around an outer surface of the shaft of a sensor or along the outer surface of the shaft of the sensor.

Various braking devices, systems, and methods are disclosed. In some embodiments, the braking device includes a support element, a block of friction material supported by the support element, at least one piezoceramic sensor supported by the support element and interposed between the block of friction material (and the support element, and a protective element located at the piezoceramic sensor and embedding the latter. The protective element can have one or more layers of resin-based material applied to protect the piezoceramic sensor and direct a predetermined part of the external compression force onto an area of the support element surrounding the piezoceramic sensor. In some embodiments, a signal transduction device is provided and includes at least one piezoceramic sensor supported on a support element and has an integral protective coating having properties of mechanical and temperature resistance.

Systems and methods for determining a Material's (MTL) mechanical properties. The methods comprise: coupling a first end of MTL to a First Mechanical Mechanism (FMM) movable in a First Direction (FD) and coupling a second end of MTL to a Second Mechanical Mechanism (SMM) movable in a Second Direction (SD); applying a first Pulling Force (PF) to MTL; applying an Oscillating Force (OF) to MTL; applying a second PF to MTL so as to cause any undulations in MTL to be removed and to cause a loading of fibers or polymeric units that support MTL; allowing MTL to oscillate through a series of cycles of loading and unloading; measuring a strain/stress on MTL as a function of time; determining a natural frequency of MTL based on the strain/stress; and determining an elastic modulus of MTL using the natural frequency.

A method of measuring an axial force of a bolt may include fastening a joint using a fastener, receiving a vibration signal by a detector, transforming the received vibration signal into frequency domain data having a plurality of frames, analyzing the signal transformed into the frequency domain data, and predicting an axial force and indicating a predictive value thereof.

A method of measuring an axial force of a bolt may include fastening a joint using a fastener, receiving a vibration signal by a detector, transforming the received vibration signal into frequency domain data having a plurality of frames, analyzing the signal transformed into the frequency domain data, and predicting an axial force and indicating a predictive value thereof.

A health device is also provided. The health device comprises a health device body and a pressure sensing system. The pressure sensing system is located on the health device body. The pressure sensing system comprises a plurality of pressure sensors, a reminder device a battery system, and a main circuit board. The plurality of pressure sensors is spaced from one another. The plurality of pressure sensors, the reminder device, and the battery system are electrically connected to the main circuit board.

A pressure transducer comprising a flexible member made of amorphous quartz and a crystalline quartz sensor are coupled together without an adhesive material. Instead, the amorphous quartz and the crystalline quartz sensor are coupled together at the molecular level. In some embodiments, the crystalline quartz sensor remains in compression or tension during the entire operating range of the pressure transducer. In one embodiment, the crystalline quartz sensor is pre-stressed in either compression or tension when the pressure transducer is exposed to atmospheric pressure. In one embodiment, pressure transducer is located in pressure stabilizing system.

A pressure transducer comprising a flexible member made of amorphous quartz and a crystalline quartz sensor are coupled together without an adhesive material. Instead, the amorphous quartz and the crystalline quartz sensor are coupled together at the molecular level. In some embodiments, the crystalline quartz sensor remains in compression or tension during the entire operating range of the pressure transducer. In one embodiment, the crystalline quartz sensor is pre-stressed in either compression or tension when the pressure transducer is exposed to atmospheric pressure. In one embodiment, pressure transducer is located in pressure stabilizing system.