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From: "Bruce Kingsley"
Subject: Re: Inductance to Voltage Converter
Date: Sat, 28 Sep 2002 21:12:13 -0700
Organization: MindSpring Enterprises
X-Server-Date: 29 Sep 2002 04:18:01 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2919.6600
As a mater of fact, yes (incredible memory!). One of the circuits suggested
was a passive circuit using a LCR circuit, feeding into a signal diode, then
a RC circuit, worked well. The problem is a slow drift (up in voltage),
about 1mV per minute. The sine wave excitation for testing was a HP waveform
generator which output was solid. We routine checked the sensor's inductance
with a Fluke LCR meter which verified the stability of the sensor's
inductance to .001 mH /hour. Metal film resistors were used and CK05 series
capacitors. Ambient test lab temperature stable to about +- 3 deg F per
Wrong selection of components?
"Jonathan Kirwan" wrote in message
> On Fri, 27 Sep 2002 16:29:00 -0700, "Bruce Kingsley"
> >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.
> Is this the same aircraft landing gear issue you brought up half a
> year ago? Still dealing with an inadequate circuit for that?
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