Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.

Interfacing of Industrial Inductive Proximity Sensor with NI DAQ and Speed Measurement

Abstract: This paper presents a method to measure DC motor speed using an industrial-rated proximity sensor and NI DAQ card. The industrial proximity sensor captures the positive edge of a wave when a metallic portion on the motor’s wheel segment has occurred. The industrial proximity sensor is interfaced to the NI DAQ which is used as a measurement device and interfacing device between the PC without any additional microcontroller or programmable logic controller. The data is processed by the MATLAB-based NI MAX toolbox. MATLAB programming is used to calculate the speed of a DC motor. The speed is recorded using the conventional setup and compared with the proposed DAQ-based setup.

Current control switching circuit with current decrease prediction

Abstract: A switching circuit for controlling the current in a load and accurately predicting its decrease by means of a galvanically isolated inductive sensor (12) providing the time derivative of the load current and followed by a capacitive integrator. An embodiment having two separate branches and an alternative, adaptive embodiment are disclosed. Applications mainly include current control circuits in power switching regulators, particularly of the high-frequency kind.

Method for adapting a pulse frequency mode of a proximity sensor

Abstract: There is described portable electronic devices having one or more proximity sensors with adaptive capabilities that can help reduce power consumption. The proximity sensors of the portable electronic device in accordance with the present invention may be adjusted to operate in multiple and/or different modes. These modes are environmentally and contextually driven. An adaptive sensor is dynamically adjusted based on different criteria. In particular, adjustments are based on correlations of input signals from one or more sensors of the device, data signals received from the device's processor and/or external data signals received from an external source, which provide characterization values of environmental, contextual and/or ambient light characteristics. Adjustments are made to pulse power to affect the range of the sensor, pulse frequency, filtering of noise of the sensor input signal to attenuate interference and the spectrum of a proximity detector.

Interference detection and mitigation in inductive sensor applications and dynamic adaptation based on real-time noise detection

Abstract: A resistive-inductive-capacitive sensor is driven at a driving frequency and a measurement of phase and amplitude is used to determine the presence of external interference to the sensor. A noise detection circuit may detect the external interference based on the profile of at least one of the phase and the amplitude versus frequency. The rate of change of the phase or amplitude being outside an expected range may indicate noise. An operating parameter of the sensor, such as the amplitude or frequency of the driving signal, the resonant frequency or capacitance of the sensor, a filter corner frequency or conversion time, or noise floor, may be modified to compensate for the interference. The noise may be measured in a noise measurement mode of increased sensitivity. The magnitude of the noise may also be estimated. The sensor may be used to detect force applied to a mechanical member 105 used as an alternative to a mechanical switch in e.g. a mobile device.