Abstract:
A vehicle which is operable by a motor and/or muscular energy, in particular an electric bicycle, which includes an electric motor, a crankshaft drive having a first crank, a second crank, and a crankshaft, a torque sensor for detecting a torque applied by a rider at the crankshaft drive, and a control unit, which is set up to actuate the electric motor based on at least the values acquired by the torque sensor to drive the vehicle, the torque sensor being situated at the crankshaft drive and the torque sensor including at least one surface acoustic wave sensor.
Abstract:
A method of evaluating a wear state of an assembly of a flow machine, in particular, of a bearing arrangement of a pump or turbine. For determining a wear characteristic, a mechanical query signal having a pre-definable signal shape is generated by a signal generator and a response signal generated from the query signal is detected using a sensor in contact with the assembly. The response signal is varied in dependence on a variation of a physical operating value of the assembly in accordance with a characteristic pattern, the wear characteristic is determined from the variation of the response signal and the wear state is evaluated using the wear characteristic.
Abstract:
A piezoelectric acoustic resonator based sensor is presented herein. A device can include an array of piezoelectric transducers and an array of cavities that has been attached to the array of piezoelectric transducers to form an array of resonators. A resonator of the array of resonators can be associated with a first frequency response corresponding to a first determination that the resonator has been touched, and a second frequency response corresponding to a second determination that the resonator has not been touched. The array of piezoelectric transducers can include a piezoelectric material; a first set of electrodes that has been formed a first side of the piezoelectric material; and a second set of electrodes that has been formed on second side of the piezoelectric material.
Abstract:
A stress measurement sensor provided with a sensor element that operates according to the SAW principle, comprising a base composed of a first material and the sensor element, which is fixed to the base with a joining material, is to be developed such that it can also be used at higher temperatures and has improved measurement properties. In addition, it is suggested that the joining material be a glass solder.
Abstract:
Non-contact torque, thrust, strain, and other data sensing of a valve actuator or valve is disclosed. A sensor may include a surface acoustic wave device.
Abstract:
A surface acoustic wave sensor to measure physical, biological or chemical parameters is claimed. Using different piezoelectric substrate materials, piezoelectric substrates with different thicknesses or metallizations with different thicknesses or patterns are used to distinguish between the effects of different physical, biological or chemical parameters.
Abstract:
Non-contact torque, thrust, strain, and other data sensing of a valve actuator or valve is disclosed. A sensor may include a surface acoustic wave device.
Abstract:
Non-contact torque, thrust, strain, and other data sensing of a valve actuator or valve is disclosed. A sensor may include a surface acoustic wave device.
Abstract:
A laser opto-acoustic apparatus and method is applied for nondestructive testing of defects and residual stresses in solids. A nondestructive testing apparatus may have a piezoelectric transducer for measuring oscillations in a solid. The oscillations or waves may be caused from longitudinal, shear, and/or Raleigh waves in the object to be tested. The nondestructive testing apparatus may also include a laser. The laser is capable of generating the longitudinal, shear, and/or Raleigh waves in the object. One method of performing nondestructive testing of materials may include creating at least one of a longitudinal, shear, and/or Raleigh wave in an object and measuring the speed of the wave in the object. The speed of the waves may be compared with the speed of waves in a material without defects to determine whether the object to be tested has defects.
Abstract:
A surface acoustic wave sensor to measure physical, biological or chemical parameters is claimed. Using different piezoelectric substrate materials, piezoelectric substrates with different thicknesses or metallizations with different thicknesses or patterns are used to distinguish between the effects of different physical, biological or chemical parameters.