Methods and systems for testing a sensor of a propeller blade angle position feedback system are described. A sensor signal is received from a sensor at a known position relative to a feedback device, the feedback comprising a ring and at least one pair of position markers spaced from one another around a circumference thereof, the sensor configured for successively detecting passage of the position markers as the feedback device rotates at a known rotational speed and an axial distance between the sensor and the feedback device varies. From the sensor signal a measured position of the sensor relative to the feedback device and a measured rotational speed of the feedback device are determined. The measured position and the measured rotational speed are compared to the known position and the known rotational speed to determine a sensor accuracy.

A method for ascertaining whether a series of sensor values contains an anomaly, including the following steps: providing a shapelet and at least one training data series; measuring in each case a distance between the shapelet and the training data series at a plurality of different predefinable positions of the training data series; ascertaining at least one minimal distance from the measured distances and ascertaining at least one change variable for at least one predefinable data point of the shapelet the change variable being ascertained as a function of at least one of the measured distances. A computer program, a device for carrying out the method, and a machine-readable memory element, on which the computer program is stored are also provided.

A circuit includes a first communication interface configured to receive first sensor data from a stationary sensor. The first sensor data include a result of a first sensing of a local environment of the stationary sensor performed by the stationary sensor. The circuit may further include a second communication interface configured to receive second sensor data from an unmanned aerial vehicle. The second sensor data include a result of a second sensing of at least a portion of the local environment of the stationary sensor performed by a sensor of the unmanned aerial vehicle. The circuit may further include one or a plurality of processors configured to compare the first sensor data and the second sensor data and to classify the at least one stationary sensor based on a result of the comparison.

A system and method for testing a resolver circuit is provided. Aspects include a resolver circuit including an excitation signal output, a sine signal input, and a cosine signal input, a switching matrix comprising an excitation input connected to the excitation signal output, a first output connected to the sine signal input, and a second output connected to the cosine signal input, wherein the switching matrix further includes a set of switches configured to route an excitation signal from the resolver circuit to mimic a sine and cosine signal output corresponding to a specified angle for a resolver sensor, a controller configured to operate the resolver circuit to output an excitation signal, determine an angle value based on a sine signal received and a cosine signal received from the switching matrix, and compare the angle value to the specified angle to determine a fault condition in the resolver circuit.

Embodiments of the present disclosure include methods, apparatuses, systems, and computer program product for enabling multi-point shunt calibration of a sensor device. Multi-point shunt calibration provides at least a first, second, and third simulated calibration output, each simulated calibration output corresponding to an actual reading value and an expected reading value. The simulated calibration outputs are associated with a predefined output sequence, where each simulated calibration output is separated from an adjacent simulated calibration output by an output step size. Some embodiments are configured for automatically outputting each simulated calibration output for a particular period of time before outputting an adjacent simulated calibration output in the predefined output sequence. The various simulated calibration outputs, actual reading values, and/or expected values may be used in determining calibrated reading values for the sensor device.

Embodiments of the present disclosure include methods, apparatuses, systems, and computer program product for enabling multi-point shunt calibration of a sensor device. Multi-point shunt calibration provides at least a first, second, and third simulated calibration output, each simulated calibration output corresponding to an actual reading value and an expected reading value. The simulated calibration outputs are associated with a predefined output sequence, where each simulated calibration output is separated from an adjacent simulated calibration output by an output step size. Some embodiments are configured for automatically outputting each simulated calibration output for a particular period of time before outputting an adjacent simulated calibration output in the predefined output sequence. The various simulated calibration outputs, actual reading values, and/or expected values may be used in determining calibrated reading values for the sensor device.

An inspection apparatus includes a stage having a placing surface, a first magnetic field generator, and a second magnetic field generator. The first magnetic field generator is configured to be changeable in orientation and to singly generate a first magnetic field. The second magnetic field generator is configured to be changeable in orientation and to singly generate a second magnetic field. The first and second magnetic field generators are configured to cooperatively generate a composite magnetic field in cooperation.

The present disclosure relates to methods and systems for validating a measurement machine. A group of validation measurements associated with a reference part is obtained. The group of validation measurements includes at least a first measurement associated with a first tolerance and a second measurement associated with a second tolerance, the second tolerance being smaller than the first tolerance. A dimension of the reference part associated with the first measurement is measured to obtain a measurement value. The measurement value is compared to a nominal value associated with the first measurement to obtain a measurement error. The measurement error is compared to the second tolerance associated with the second measurement. When the measurement error is less than the second tolerance, a validation signal is issued to the measurement machine.

A method for analyzing a sensor with respect to unstable errors, wherein a gradient signal is generated based on a sensor signal. Based on the gradient signal, an evaluation unit is used to assign a slope category to a first slope of the sensor signal and a second slope of the sensor signal, the second slope following the first slope. The evaluation unit ascertains a class of error based on the slope categories assigned to the first slope and the second slope.

A method for testing a sensor with a primary inductor which is galvanically isolated from first and second secondary inductors which are respectively coupled inductively to the primary inductor, including: calculating a sensor output signal, wherein the sensor output signal is dependent on the coupling between the primary inductor and the first secondary inductor as well as that between the primary inductor and the second secondary inductor; determining a first electrical variable, which is different from the sensor output signal; comparing the first electrical variable with a first limiting value in order to determine whether the sensor is in a faulty state, as well as to a corresponding device and to a sensor having the device.