A remote sensor calibration system remotely calibrates sensors of various types in an automated fashion. The remote sensor calibration system receives sensor output, associated with one or more locations and one or more times, from a sensor and its peer sensor population. The sensor output from the sensor and its peer sensor population is compared to generate a correction factor. The correction factor is transmitted to the sensor and used to calibrate the sensor. Communication will typically occur via one or more wireless links allowing the sensors to be remotely calibrate while maintaining their mobility.

A sensor assembly with a sensing element sends a sensor signal from the sensing element to attached process transmitter over sensor connection wires. The sensor assembly has memory circuitry for storing information related to the sensor assembly and interface circuitry that provides for digital communication of the stored information with the attached process transmitter. This digital communication is sent over the sensor connection wires.

A circuit for biasing and reading out a bridge sensor structure comprises at least two pairs of connection terminals. The circuit comprises an excitation signal generator for generating an excitation signal for biasing and/or exciting the bridge, in which the excitation signal is provided as a non-constant periodic continuous function of time, and a detection circuit for obtaining the sensor signal from the bridge sensor structure by electrically connecting the detection circuit to any pair of connection terminals while applying the excitation signal to another pair. The circuit comprises a switch unit for switching the electrical excitation signal and for switching the detection circuit. A controller controls the switch unit to switch the first pair from being connected to the excitation signal generator at a time when the generated excitation signal is in a predetermined signal range where the excitation signal value is substantially equal to zero.

A circuit for biasing and reading out a bridge sensor structure comprises at least two pairs of connection terminals. The circuit comprises an excitation signal generator for generating an excitation signal for biasing and/or exciting the bridge, in which the excitation signal is provided as a non-constant periodic continuous function of time, and a detection circuit for obtaining the sensor signal from the bridge sensor structure by electrically connecting the detection circuit to any pair of connection terminals while applying the excitation signal to another pair. The circuit comprises a switch unit for switching the electrical excitation signal and for switching the detection circuit. A controller controls the switch unit to switch the first pair from being connected to the excitation signal generator at a time when the generated excitation signal is in a predetermined signal range where the excitation signal value is substantially equal to zero.

Provided is a rotation angle detection device configured to detect a rotation angle of a magnetic field generation source, based on a magnetic field in at least two directions detected by a magnetic field detection device. The rotation angle detection device includes a correction value calculation unit configured to calculate a correction value of the rotation angle; an angle output unit configured to output an angle output signal indicative of the rotation angle of the magnetic field generation source, based on a magnetic field detection signal to be output from the magnetic field detection device and the correction value; and a filter unit capable of selecting a first filter characteristic, which is to be used for outputting the angle output signal, and a second filter characteristic, which is to be used for calculating the correction value and is different from the first filter characteristic.

Reducing a sensitivity of an electromechanical sensor is presented herein. The electromechanical sensor comprises a sensitivity with respect to a variation of a mechanical-to-electrical gain of a sense element of the electromechanical sensor; and a voltage-to-voltage converter component that minimizes the sensitivity by coupling, via a defined feedback capacitance, a positive feedback voltage to a sense electrode of the sense element—the sense element electrically coupled to an input of the voltage-to-voltage converter component. In one example, the voltage-to-voltage converter component minimizes the sensitivity by maintaining, via the defined feedback capacitance, a constant charge at the sense electrode. In another example, the electromechanical sensor comprises a capacitive sense element comprising a first node comprising the sense electrode. Further, a bias voltage component can apply a bias voltage to a second node of the electromechanical sensor. In yet another example, the electromechanical sensor comprises a piezoelectric sense element.

A method for determining a measurement signal based on a sensor output electrical signal. The electrical signal based on the measured quantity conversion of the electrical signal into a measurement signal. Determining the measurement signal for least two pairs of values by converting the electrical signal into a measurement signal for at least two predetermined electrical signal values, each pair of values including the electrical signal and measurement signal. A mathematical function allowing a measurement signal to be obtained based on the electrical signal is determined based on the pairs of values. The measurement signal being substantially equal to the measurement signal obtained by applying the sensor conversion to the same sensor electrical signal. At least two measurement signals are determined without sensor conversion. Acquisition of the two measurement signals separated by a time shorter than the time to convert an electrical signal into a measurement signal by sensor conversion.

A method for determining a measurement signal based on a sensor output electrical signal. The electrical signal based on the measured quantity conversion of the electrical signal into a measurement signal. Determining the measurement signal for least two pairs of values by converting the electrical signal into a measurement signal for at least two predetermined electrical signal values, each pair of values including the electrical signal and measurement signal. A mathematical function allowing a measurement signal to be obtained based on the electrical signal is determined based on the pairs of values. The measurement signal being substantially equal to the measurement signal obtained by applying the sensor conversion to the same sensor electrical signal. At least two measurement signals are determined without sensor conversion. Acquisition of the two measurement signals separated by a time shorter than the time to convert an electrical signal into a measurement signal by sensor conversion.

A detection circuit includes a charge amplifier, a calculation unit, and first and second paths. The charge amplifier converts the amount of electric charge generated by a sensor element into a voltage. The first path and the second path each connect the charge amplifier and the calculation unit. The amplification factor of the first path is higher than the amplification factor of the second path. When a voltage output from the first path is lower than a threshold voltage, the calculation unit detects a pressing force by using the output voltage. When the output voltage is equal to or higher than the threshold voltage, the calculation unit detects a pressing force by using a voltage output through the second path.

An embodiment of an equipment health state monitoring method adapted to monitor an equipment having a monitored part, including: obtaining a plurality of first values of the monitored part from a sensor in a first time period; extracting a plurality of first parameters from the first values; generating an equipment health state index model according to the first parameters; obtaining a plurality of second value from the sensor in a second time period after the first time period; extracting a plurality of second parameters from the second values; generating a plurality of equipment health state indices according to the second parameters and the equipment health state index model; generating a health state control chart according to the equipment health state indices; and determining whether each of the equipment health state indices locates in an alert area of the health state control chart and outputting a determination result accordingly.