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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Inductance to Voltage Converter
Date: Sat, 28 Sep 2002 07:03:10 GMT
NNTP-Posting-Date: Sat, 28 Sep 2002 00:03:10 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
Bruce Kingsley wrote:
> I'm looking for an accurate, stable circuit for converting Inductance to
> Voltage for monitoring an Inductive sensor position. Here's the facts:
> 1) The inductor sensor (2-wire) varies 7 mH to 9 mH based on target's
> (ferrous) distance.
> 2) Excitation must be 1kHz @ 400mV.
> 3) DC Output desired is a clean 0 to 10 VDC.
> 4) The sensor is known as an Inductance Proximity Sensor.
> Thanks to all.
> Bruce Kingsley
1) Well, it sounds like that the inductance of the sensor changes when
iron or other ferrous material gets near it. Putting the inductor in a
bridge or as a part of an oscillator would be the ways to get an AC
signal that would represent the inductance.
2) Alternately, a magnet is a part of the sensor, and it could then be
described as a variable reluctance pickup. Such devices are velocity
sensitive to paramagnetic and diamagnetic materials; sensitivity
depending on the material at a given velocity and geometrical
relationship. The output is a "DC" voltage that is induced by the
movement and can be amplified. In oil wells, a collar locator is
designed in a similar manner, the pulse is amplified to (basically)
determine where one pipe ends and the next one begins (gives an
indication of distance).
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