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From: macminn@powertool.crd.ge.com (Stephen R MacMinn)
Newsgroups: sci.electronics
Subject: Re: Wiegand wires?
Message-ID: <11504@crdgw1.crd.ge.com>
Date: 31 Aug 90 02:40:52 GMT
References: <5770030@hpscdc.scd.hp.com>
Sender: news@crdgw1.crd.ge.com
Reply-To: macminn@powertool.crd.ge.com (Stephen R MacMinn)
Organization: General Electric Corp. R&D, Schenectady, NY
Lines: 16

John Schmitz writes:
>Does anybody out there have any information on "Wiegand wires"?

I've had some experience with Wiegand sensors.  They're a variety of
magnetic sensor that makes use of a material property called the
Wiegand effect.
I'm not sure of the details (though I could dig some up), but the
essence of the matter is that when the magnetic field passing through
the sensor changes polarity, the sensor puts out a fixed magnitude
voltage pulse (the ones I saw were 2V).  The pulse magnitude is
independent of the rate at which the polarity change occurs.
The sensors we bought have the added benefit of working to
temperatures of 200 degrees C, beyond the range of semiconductor based
(Hall) sensors.
I've got more information.  If you're interested, you can send me
E-mail (macminn@crd.ge.com).