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From: Tony Williams
Subject: Re: Inductance to Voltage Converter
Date: Sun, 29 Sep 2002 15:51:59 +0100
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Sun, 29 Sep 2002 14:52:48 +0000 (UTC)
User-Agent: Pluto/1.14i (RISC-OS/3.60)
In article ,
Winfield Hill wrote:
> Right. The "circuit" of course is just a block diagram. We
> have no interest or use for the dc signals, as our concern is
> only the in-phase balance at 1kHz. Therefore ac coupling can
> be used throughout as desired, up to the output of the error-
> detecting multiplier, where a dc signal is first generated.
Quadrature current balance I think. However iron
losses are a large variable, and I have seen a
similar app that did work with inphase unbalance
to detect the change in losses as the sensed signal.
> Nice idea. As it stands the 1/RC gain of the integrator isn't
> at all critical (nor are the gains of the error amplifiers or
> the error-detection multiplier). But reasonably-stable resistors
> and capacitor are much smaller than a stable 10mH inductor; so
> routing the integrator's output to the bridge-balance multiplier
> could be an attractive proposition. However, an interesting idea
> is to use a 10mH inductor constructed with the same methodology
> as the sensor, creating a temperature-tracking bridge.
I suggested it because of the up to 20m separation.
They don't share the same environment. It might be
useful though to consider two remote sensors, with
the ferrous target moving from one to another.
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