According to an example aspect of the present invention, there is provided a MEMS pressure sensor, comprising: a sensor portion comprising a deformable membrane and a first volume, and a valve portion comprising a first output to a first side of the pressure sensor and a second output to a second side of the pressure sensor. The valve portion is operable to close the second output and open the first output to equalize pressure in the first volume with pressure at the first side of the pressure sensor for calibrating the sensor; and close the first output and open the second output to equalize pressure in the first volume with pressure at the second side of the pressure sensor for pressure measurement.

A method and assembly for acquiring pressure data. A pressure sensor is applied to a target surface on an individual. A calibrator and a processing element are in communication with the pressure sensor. Processing element receives pressure data and provides an integrated pressure value over a measurement time period. The integrated pressure value is compared to an alert value and to a change condition value. Where an alert value is exceeded, an alert is transmitted to an output device for display. Where a change condition value is exceeded, a measurement parameter of the pressure sensor is changed, or the calibrator is applied to the pressure sensor to recalibrate the pressure sensor to a recalibrated pressure range.

Methods and systems include a universal, device-agnostic calibration process in which measured indications output by a device under test (DUT) (or corrected or converted indications derived therefrom) may be compared with calibration thresholds for any type of DUT to be calibrated. A complete, universal, and extensible calibration process is thus achieved that is capable of accommodating routine and complex calibration scenarios alike. A common set of statistics may be generated for all devices to be calibrated, without regard to the particular device under test, and statistics of the common set of statistics may be evaluated to determine the calibration state of the DUT. Additionally, the methods and systems disclosed herein provide for generating a comprehensive set of measurement records that may include some or all original observations, calculations, corrections, conversions, environmental factors, and measurement results, e.g., according to a standard, which allows for step-by-step auditing of every measurement performed.

To enable early detection of abnormal states including accumulation on a pressure sensor, a characteristic measuring portion obtains a change in an output of a pressure sensor in a state in which the temperature of a sensor chip is changed by operation of a temperature controlling portion and thereby obtains a sensor characteristic indicating the change in the output. A state determination portion determines an abnormal state of a diaphragm by comparing the sensor characteristic obtained by the characteristic measuring portion with a reference characteristic, used as a reference, stored in a reference value storing portion.

A pressure detecting device is mounted in a measurement target and instrument includes a strain inducer to which pressure of a pressure medium is applied and which generates strain in accordance with the pressure and a strain detecting element that is bonded onto a surface opposite to a pressure receiving surface of the strain inducer, in which the strain detecting element includes one or multiple central strain resistant bridges which are arranged at a central portion of the strain detecting element in a bonded surface direction, and one or multiple outer peripheral strain resistant bridges which are arranged at an outer periphery, and in which, for example, deformation of the strain detecting element caused by an external force when being screw-fixed to the measurement target instrument is obtained through the multiple strain resistant bridges. An error of detection pressure caused by the deformation in a pressure value detected through the central strain resistant bridge is corrected.

The invention relates to a method for determining a pressure measurement signal in a capacitive pressure measurement cell which comprises a main body and a measurement membrane that is arranged on the front of said main body. Electrodes are arranged on said main body and measurement membrane and form a measurement capacitance in a region of the measurement membrane which has a high degree of pressure sensitivity, and form a reference capacitance in a region of the measurement membrane which has a lower degree of pressure sensitivity, said measurement capacitance and reference capacitance being determined independently of one another, the pressure measurement signal being determined in a first measurement range from the measurement capacitance and the reference capacitance, in accordance with the first evaluation, and said pressure measurement signal being determined in a second measurement range from the reference capacitance in accordance with a second evaluation.

A sensor arrangement and a method of operating a sensor arrangement are disclosed. In an embodiment, a sensor arrangement includes a pressure sensor realized as a capacitive pressure sensor, a capacitance-to-digital converter, a test circuit and a switching circuit coupling the capacitance-to-digital converter and the test circuit to the pressure sensor.

In one aspect, the disclosure provides a pressure sensor that wirelessly provides force/pressure data to a wireless receiver. The pressure sensor includes a first fluid-responsive membrane configured to be exposed to a region, such as a body fluid, whose pressure is being monitored. A force transducer for measuring this pressure is movable toward and away from the flexible membrane and may be oscillated, either out-of-contact with the first fluid-responsive membrane or in-contact therewith, for static/dynamic pressure sensor calibration. An actuator for displacing/oscillating the force transducer is located within the internal housing. Specific pressure transducers, fluid drainage systems, implantable devices and (at least partially) external sensing devices are disclosed. Calibration techniques, including recalibration to adjust for device drift and to clear biofouling are disclosed.

A method and system of calibrating uncalibrated sensors among sensors distributed along a pipeline network include designating a set of the sensors as upstream sensors based on their geopositions, and designating remaining ones of the sensors other than the set of the sensors as downstream sensors. The method also includes determining a temporal delay associated with each of the sensors. Calibrating the uncalibrated sensors is based on the corresponding temporal delay and on calibrated sensors among the sensors.

A method and a device for measuring the torque in the drivetrain (1) of a wind power plant is described, having at least two incremental encoders (7, 8) which are positioned at two different positions on at least one shaft (3) of the drivetrain (1) and which each supply periodic rotational signals, wherein the phases of the rotational signals are evaluated in order to detect a phase shift, and a torque of the shaft (1) is determined from the phase shift. The detected phase shift is corrected as a function of a zero load phase shift (A.sub.Zero), using a rigidity factor K, wherein, in order to determine the zero load phase shift (A.sub.Zero) and the rigidity factor K, in-situ calibration is carried out before and/or between the torque-determining processes. The in-situ calibration is performed at zero load of the wind power plant, i.e. below a rated rotational speed and with a generator torque equal to zero, and at the rated load of the wind power plant, i.e. at the rated rotational speed and with a generator torque greater than zero.