Inductive sensor

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

Optical fibre unwinder with ultrasonic winding angle sensor - maintains forces on unwound fibre at low levels by contactless measurement and control of motor displacement

Abstract: The light conductor (10) is unwound from a spool (11) whose shaft (12) is rotated by a motor (13). Tension is measured in a loop (14) around a sliding roller whose position is fed back from an inductive proximity sensor (15) to the motor controller (16). The angle (alpha) between the turns on the spool (11) and the direction of the unwound fibre is measured by an ultrasonic detector (20) linked to the controller (21) of a drive (22) adjusting the axial position of the motor (13). ADVANTAGE - Position of unwound fibre is measured sensitively without contact or stress. Prevents damage occurring by rapidly charging take-off angles esp. in confined space.

Inductive sensor arrangement for determining a rotation or a displacement

Abstract: The sensor consists of at least one coil system which includes one or more primary coils (Lpi) each of which is part of an oscillator circuit and generates an electromagnetic field; and a set of n secondary coins (Lsj), where n is greater than or equal to 2. An influencing element (BE) electromagnetically influences at least two secondary coils, when displaced. A device (M) is also provided for evaluating the changes or differences in the influences. An Independent claim is also included for an inductive sensor device.

A Modified Impedance-Frequency Converter for Inexpensive Inductive and Resistive Sensor Applications.

Abstract: In this paper an exceptionally simple transducer is presented that is developed for experimental and custom-made sensors with inductive or resistive impedance output. It is based on a venerable 555 Integrated Circuit in a modified astable configuration. Due to single supply 5 V operation, it is directly compatible with most modern microcontroller systems, such as the popular Arduino platform. Various exemplary sensor characteristics are presented, including displacement, force, magnetic field, temperature and light sensing applications. While the transducer is not designed for high accuracy, it allows for fast and inexpensive application of various experimental sensors, such as magnetoelastic or GMI (Giant Magneto Impedance) sensors.

Pulling of SAW resonators for wireless sensor application

Abstract: SAW resonators are particularly suitable for passive wireless sensing because of the high Q factor (storage of rf energy) and the possibility to change their resonance be- haviour influenced by an external measurand (frequency pulling). The sensor is build not only by a physical af- fecting of the acoustic wave but also by an electrical interaction outside the resonator (e.g. capacitive or inductive). The sensor signal is determined by the ex- ternal circuit elements and manifests in a fre- quency and amplitude shift. The pulling frequency and the optimum pulling span, also the transmitted power are estimated by the external reactive circuit ele- ments, as well as by the SAW-Resonator characteristic. To obtain the maximum power transmis- sion, a matching between the sensor element and the antenna for wireless interrogation is necessary; simultaneously, one element of the matching network is the sensing element that pulls the frequency. For well-designed sensors, the parameters of equivalent circuitry of the resonator have to be estimated with a high accuracy, in order to simulate the resonator pulling in combination with different matching networks. Thus, from all the L-, Pi- and T-sections, the eligible con- figuration were selected and tested in order to ensure the maximum power transmission in a wide pulling range. This paper presents simulation and ex- perimental results for designing proper sensor systems.

Bore outer surface shape determining appts. - has contactless inductive sensor element with coil generating electromagnetic field

Abstract: An arrangement for determining the shape and quality of the surface of a cylindrical metal workpiece such as a bore, bolt or pin contains an inductive, contactless sensor element (6) which is moved along the measurement surface. The workpiece (11) and sensor element act like a fitting with play with the sensor element as the inner or outer element and guided concentrically w.r.t. the workpiece surface. The element contains a coil (9) which generates an electromagnetic field distributed about its surface which interacts with workpiece surface and influences the coil parameters. ADVANTAGE - Can detect threads and thread defects in a single measurement process.