Inductive sensor

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

Inductive coin validation system and payphone using it

Abstract: A coin validation arrangement, usable for example in pay telephones, uses one or more inductive sensors (17) having a small effective magnetic field so that the inductive sensor (17) responds only to the material of a strip across the coin. Preferably a plurality of inductive sensors (17) are used, mounted at different heights above the floor (23) of the coin guide, at different positions along the coin path. At each position along the coin path there may be either one or a plurality of inductive sensors (17). Preferably the inductive sensors (17) are surface mount inductors on a printed circuit board which forms part of one wall (19) of the coin guide. Such arrangements are particularly useful for recognising coins having an outer ring made of a different material from the central disc, and for distinguishing such coins from uniform composition coins.

Welding or cutting device

Abstract: A welding or cutting device for welding or cutting electrically conductive work pieces has a pipe that accommodates feed lines, a nozzle for exit of a welding or cutting jet, such as a flame, for example, disposed at an end of the pipe, forming a device tip with its free end, and an inductive sensor device for measuring the distance between the device tip and the work piece. The sensor device has at least one magnetic coil, the windings of which run about a longitudinal device axis. The sensor device is a separate module, which is pushed onto the pipe and/or the nozzle, and releasably connected with the pipe and/or the nozzle.

Inductive Sensor With Sintered Magnetic Core to Evaluate the Performances of the Table Tennis Players

Abstract: The reaction speed of the tennis player and the speed of the ball after the impact to the tennis blade, they both are important elements of the performance evaluation of a tennis player. The determination of those parameters is possible by using specialized contact sensors. Permanent ceramic magnets can be used to process such sensors and the paper presents the experimental results concerning the processing of such magnets of barium hexaferritte powders

Measuring distance from sensor to electrically conducting target by measuring simultaneously or sequentially impedances of two coils on a common magnetic core

Abstract: Inductive sensor comprises a magnetic core (1) which has two coils (2,3) spaced by a distance (d0). To find the distance from the sensor to an electrically conducting target an alternating current is passed through them either simultaneously or successively and the difference between their impedances is found. The impedance difference is used to find the target distance after conventional calibration

An inductive sensor for measuring the position of a control rod within a nuclear reactor

Abstract: A sensor 1 comprising a variable capacitor 2, an inductor 3, a voltage source 4 and a toroidal transformer 5 connected in series within an electrical circuit 6, which is tuned to be a resonant circuit. The sensor is used to measure the relative movement of the inductor 3 and a metallic member 9 by measuring changes in magnitude of the current in the resonant circuit 6 as the metallic member 9 enters the magnetic field 8 of the inductor 3. The sensor 1 can be used to measure linear and rotational movement. For example, the metallic member 9 may be attached to a control rod within a nuclear reactor, or the metallic member may comprise a rotatable disc (19, Fig 2) attached to the shaft of a pump within a nuclear reactor.