Multi-sensor Method Of Producing A
Material Independent Inductive
Distance Measuring Device
Author(s)
S. Johnstone
Abstract
In harsh industrial applications, it is often necessary to measure the distance
between metal objects, e.g. to determine the shape of a steel strip. Due to the
presence of hot steam, water and dirt, inductive sensors are typically used but
they have to be recalibrated each time the target material is replaced or the sensor
is moved laterally. This work investigates the use of the sensor system to reduce
the effects of material property variations. This design also enables a lateral
movement compensation algorithm to be applied, thus leading the way to a true
target independent distance-measuring device.
This paper investigates a novel method of compensating for the effects of
material property variations on distance measurement using a sensor consisting
of a permanent magnet and a 500 kHz eddy current device. This was achieved by
producing empirical models for each of the sensor outputs. Results on steel
samples transforming from the austenite to ferrite phase show that, for slow
changing material variations of less than 3Hz, the error in the distance
measurement can be reduced from 37% to less than 2%.
Keywords: inductive sensors, distance measurement, non-destructive testing.
1 Introduction
In harsh industrial environments such as steel mills, metal component fabrication
plants etc it is often desirable to measure the dimensions of products and or
actuators of machinery used in the process. Examples include measuring the
profile of steel strip at speeds up to 12ms-1 or locating an actuator controlling the
size of a mould used for casting steel products. Because the product is often at
high temperature in these processes there are several factors which can affect the
Keywords
inductive sensors, distance measurement, non-destructive testing
Related Book
Other papers in this volume
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