Inductive sensor

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

Detector for sensing magnetic piston position in cylinder - uses two magnetic sensors, one mother sensor acting as a distribution device for transfer of signals to computer

Abstract: Two sensors, e.g. reed contacts, Hall sensors or inductive sensors are mounted on the outer cylinder wall. The sensor signals are fed to a computer or relay via cables for evaluation. The supply lines (12) of a second sensor (14) are coupled to those (17) of a mother sensor (15) acting as a distribution component and as a sensor. The signal wire (13) of the second sensor is fed via the mother sensor and fed to the computer with the signal wire (18) of the mother sensor. USE/ADVANTAGE - For accurate position measurement in hydraulic or pneumatic cylinder. Reduced number of lines without endangering sensor function or increasing wire diameter.

Resistive bolometer sensor

Abstract: A resistive bolometer sensor is provided, in which a fixed resistor is replaced with a sensor resistor to reduce an error of an output value due to temperature variation, thereby improving sensitivity. The resistive bolometer sensor comprises: a sensing unit for sensing an infrared ray, the sensing unit including a sensor resistor and three compensation sensor resistors; a supporting unit for supporting the sensing unit, for controlling heat transfer to the outside; and a silicon rim supporting the overall elements of the sensor, for reflecting an external temperature, wherein the sensor resistor senses a resistance value by incident infrared ray, and the three compensation sensor resistors have a bridge structure with the sensor resistor and senses a environmental temperature to compensate a resistance value that varies in accordance with temperature variation.

An Axial Position Sensor for Active Magnetic Bearings

Abstract: Inductive sensors commonly used in Active Magnetic Bearings (AMBs) comprise soft-magnetic cores on stators and sensor targets on rotors. The rotor position is estimated based on values of inductances of sensor coils wound around the cores. These sensors are often easier to use than eddy-current sensors, but their readings can be affected by stray magnetic fields from AMB actuators. For radial sensors this problem can be mitigated by using two diametrically-opposite sensor heads in differential connection, however, the same cannot be done for axial sensors. In addition, the axial sensors often need to be located as close as possible to axial actuators, where the stray fields are higher, in order to minimize changes of the actuator operating gaps caused by differences in thermal expansions of the rotor and the stator. The axial sensor presented in this paper has been developed to address primarily the issue of sensitivity to external fields. The closest kin of the proposed sensor is the axial inductive edge sensor. Because the magnetic excitation flux in the new sensor is maintained nearly constant during the operation, it was given a name “a constant-flux edge sensor”. A prototype of the new sensor has been built and tested.Copyright © 2010 by ASME

Novel vehicle and motorcycle classification using single element piezoelectric sensor

Abstract: Accurate data reporting ensures suitable roadway design for safety and capacity. Currently, vehicle classifier devices employ inductive loops, piezoelectric sensors, or some combination of both to identify 13 different FHWA vehicle classifications. Systems using inductive loops have failed to accurately classify motorcycles and record relative pertinent data. Previous investigations have focused on classification techniques utilizing inductive loop signal output, magnetic sensor output with neural networks, or the fusion of several sensor outputs. This paper presents a novel vehicle classification setup that uses a single piezoelectric sensor placed diagonally across the traffic lane to accurately identify motorcycles from among other vehicles by detecting the number of vehicle tires. A vehicle classification algorithm based on number of tires detected and axle/tire spacing was formulated and deployed in an embedded system for field testing.

Monitoring system for detecting axial and radial movement.

Abstract: A system for sensing a position of a body rotating about an axis, the system including at least one inductive sensor positioned in proximity to the body, each of the at least one inductive sensor providing an output; material forming part of the body for effecting a variation in the output of the at least one inductive sensor as a function of axial movement of the body relative to the axis; circuitry for analyzing the output of the at least one inductive sensor to produce a system output indicative of the axial movement.