A manufacturing error and a mounting error of a position sensor used for detection of a rotation angle of a rotary shaft are appropriately calibrated to improve detection accuracy of the rotation angle. Therefore, an angle detection device 1 includes at least a first crank angle sensor 1211 and a second crank angle sensor 1212 provided to be capable of detecting a rotation angle of a rotary shaft of a crankshaft 123, and includes: a gain corrector 4 that corrects at least any one of gains G1 and G2 of the first crank angle sensor 1211 and the second crank angle sensor 1212 such that an amplitude ya of a differential signal S41b of the first crank angle sensor 1211 is equal to an amplitude yb of a differential signal S42b of the second crank angle sensor 1212; and a phase corrector 5 that corrects at least any one of a phase αa of the differential signal S41b and a phase αb of the differential signal S42b such that the phase αa of the differential signal S41b is equal to the phase αb of the differential signal S42b.

Example systems are described for remotely interacting with a portable field measurement device. Systems can include a controller that can: couple to a mobile device; receive user input from a user through the mobile device; cause the portable field measurement device to execute the operations directed by the user; electronically record data output from the portable field measurement device resulting from the directed operations; and report the data to the user via the mobile device, and/or to a remote electronic database. In some embodiments, a robotic arm can be used to actuate the portable field measurement device.

Methods and systems estimate calibration errors of magnetic sensor measurements collected at mobile devices. Each measurement is associated with a location of one of the mobile devices and has a calibration error. Data from the sensor measurements is partitioned into sets. Each set is associated with a respective calibration error associated with the measurements that generated the data in the set. Pairs of data items are identified, where each pair includes a data item from a first of the sets corresponding to a measurement, associated with a first location, that generated the data in the first set, and a data item from a second of the sets corresponding to a measurement, associated with a second location that is approximately the same as the first location, that generated the data in the first set. The calibration error associated with each of the sets is estimated based in part on the pairs.

Methods and systems estimate calibration errors of magnetic sensor measurements collected at mobile devices. Each measurement is associated with a location of one of the mobile devices and has a calibration error. Data from the sensor measurements is partitioned into sets. Each set is associated with a respective calibration error associated with the measurements that generated the data in the set. Pairs of data items are identified, where each pair includes a data item from a first of the sets corresponding to a measurement, associated with a first location, that generated the data in the first set, and a data item from a second of the sets corresponding to a measurement, associated with a second location that is approximately the same as the first location, that generated the data in the first set. The calibration error associated with each of the sets is estimated based in part on the pairs.

An image based opto-electronic encoder for a joint, the encoder having a reading head for the first part of the joint and an optical system, comprising a ball lens for the second part of the joint. The ball lens has a front surface transparent for measuring light and an at least partially reflective, structured back surface. The ball lens has -with respect to the measuring light- a refractive index of at least approximately two or an equal radially varying refractive index, such that a bundle of measuring light rays reflected inside the ball lens from a point of the back surface of the ball lens forms at least approximately a parallel bundle after getting refracted at the front surface of the ball lens. The reading head and the ball lens are rotatable relative to each other in at least two degrees of freedom.

A sensor circuit for measuring a physical quantity including: a signal acquisition circuit having a sensor to provide an input signal related to the physical quantity; a processing circuit to receive the input signal and for providing an output signal representative of the physical quantity; the processing circuit comprising a closed loop comprising: a first sub-circuit arranged for receiving the input signal and a feedback signal, and configured for providing a first signal; a frequency dependent filter for receiving and filtering the first signal, and for providing the output signal; a second sub-circuit for receiving and converting the filtered signal into the feedback signal using a non-linear function.

A system and method for multi-rate synchronization of a digital sensor that provides a digital sensor output signal and a processor arrangement that processes the digital sensor output signal according to a processing algorithm and that provides a processor output signal, including operating the digital sensor to provide the digital sensor output signal with a first sample rate, and operating the processor arrangement to provide a processor output signal with a second sample rate. The second sample rate is an integer multiple of the first sample rate.

A system and method for multi-rate synchronization of a digital sensor that provides a digital sensor output signal and a processor arrangement that processes the digital sensor output signal according to a processing algorithm and that provides a processor output signal, including operating the digital sensor to provide the digital sensor output signal with a first sample rate, and operating the processor arrangement to provide a processor output signal with a second sample rate. The second sample rate is an integer multiple of the first sample rate.

In accordance with an embodiment, a method for monitoring a data converter configured to convert data using a calibration determined by a calibration data record includes calibrating the data converter in order to determine a corresponding multiplicity of time associated calibration data records at a multiplicity of different times; and determining a state of the data converter based on comparing at least one of the multiplicity of time associated calibration data records with a comparison data record.

The present teaching relates to apparatus, method, medium, and implementations for simultaneously calibrating multiple sensors of different types. Multiple sensors of different types are first activated to initiate simultaneous calibration thereof based on a 3D construct including a plurality of fiducial marks. Sensors of different types including visual and depth based sensors operate in their respective coordinate systems. Each of the sensors is calibrated by acquiring sensor information of the 3D construct, detecting a feature point on each of the plurality of fiducial markers based on the sensor information, estimating a set of 3D coordinates, with respect to its coordinate system, corresponding to the detected feature points, based on which calibration parameters are generated. Sets of 3D coordinates derived in different coordinate systems are then used to compute at least one transformation matrix for corresponding at least one pair of the plurality of sensors.