The design of a proximity inductive sensor

Abstract

In this paper we discuss the advantages of flat coil inductive proximity sensors. The coil copper helix may be realized by application of a photoengraving technique to two side-printed boards by a very cheap process. The low thickness allows one to get the coil closer to the target. This fact allows one to attain a higher sensitivity. The coil's low intrinsic capacitance and inductance allow one to work at high frequencies (up to some megahertz). As a consequence the sensor's time constant may decrease to some microseconds. A discussion of the parameters that influence the sensor's performance is reported. Special attention has been given to the coil's shape, the target and the electronic revealing circuit required for promptly functioning and precise devices. The complete analysis of the influences of these parameters on the sensor's performance gives useful suggestions that allow one to obtain a fast response, high sensitivity and high intrinsic insensitivity versus temperature. This is obtained by adopting flat coils, bimetallic (magnetic-non-magnetic) targets and an electrical bridge or frequency-shifting circuit. This provides a substantial improvement in performance with respect to previous solutions.

Sistem Monitoring dan Kontrol Motor AC 3 Phasa Melalui Inverter dengan Protokol Modbus Menggunakan Visual Basic Berbasis Atmega 2560

“…Sensor proximity induktif bisa menjadi salah satu sensor pengganti sensor Photo Innterupter untuk mendeteksi kecepatan putaran pada motor. sensor's proximity induktif bekerja dengan prinsip induktansi yang merupakan keadaan dimana terjadi suatu fluktuasi arus listrik yang mengalir pada sebuah bahan magnetik menginduksi electromtive force (emf) dari sebuah object / target berupa metal [4]. Sensor proximity indukitf akan bekerja berdasarkan perintah yang dibuat pada Arduino Mega 2560.…”

A dual-mode proximity sensor with integrated capacitive and temperature sensing units

“…The proximity information will prevent the robots from accidental collision, which may cause damage to the humans or to themselves [1]. There have been various proximity measurements for robots so far such as ultrasonic, optical, infrared, inductive and capacitive sensors [5][6][7][8][9][10]. Among them, the capacitive proximity sensor [11][12][13][14][15] and the temperature sensor are suitable for integration as both of them consist of simple electrodes only and a temperature sensor fabricated by the GNP film has good temperature sensitive properties.…”

A study on development of inductive sensor for automatic weld seam tracking

“…The sensor is simple in construction and hence widely used for the detection of mechanical variables such as position or displacement [2]. Since the relationship between the induced voltage and the condition of a workpiece is affected by the electrical conductivity and magnetic permeability of the object and the geometrical configuration [3], it is very difficult to define the * Corresponding author. relationship theoretically.…”