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tech / sci.electronics.design / Re: Electric Field Transformer

SubjectAuthor
* Re: Electric Field TransformerAnthony William Sloman
+* Re: Electric Field TransformerFred Bloggs
|`- Re: Electric Field TransformerJohn Larkin
`* Re: Electric Field TransformerFred Bloggs
 `- Re: Electric Field TransformerAnthony William Sloman

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Re: Electric Field Transformer

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Subject: Re: Electric Field Transformer
From: bill.slo...@ieee.org (Anthony William Sloman)
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 by: Anthony William Slom - Sun, 24 Sep 2023 13:12 UTC

On Sunday, September 24, 2023 at 10:54:03 PM UTC+10, Fred Bloggs wrote:
> Everyone is aware of the technique of running multiple turns of wire through an ammeter current probe to place the measurement within the meter scale for reasonable accuracy.
>
> What's the equivalent procedure for multiplying an electric field measurement/ indication for a non-contact meter?

Perhaps a

https://en.wikipedia.org/wiki/Field_mill

it's not really the same thing, but turning a static field into AC is a useful trick too.

--
Bill Sloman, Sydne

Re: Electric Field Transformer

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Subject: Re: Electric Field Transformer
From: bloggs.f...@gmail.com (Fred Bloggs)
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 by: Fred Bloggs - Sun, 24 Sep 2023 13:35 UTC

On Sunday, September 24, 2023 at 9:12:19 AM UTC-4, Anthony William Sloman wrote:
> On Sunday, September 24, 2023 at 10:54:03 PM UTC+10, Fred Bloggs wrote:
> > Everyone is aware of the technique of running multiple turns of wire through an ammeter current probe to place the measurement within the meter scale for reasonable accuracy.
> >
> > What's the equivalent procedure for multiplying an electric field measurement/ indication for a non-contact meter?
> Perhaps a
>
> https://en.wikipedia.org/wiki/Field_mill
>
> it's not really the same thing, but turning a static field into AC is a useful trick too.

Right- I'm familiar with that technique. Put the signal in a very narrow band using low noise, offset and drift electronics.

>
> --
> Bill Sloman, Sydne

Re: Electric Field Transformer

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Subject: Re: Electric Field Transformer
From: bloggs.f...@gmail.com (Fred Bloggs)
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 by: Fred Bloggs - Sun, 24 Sep 2023 13:56 UTC

On Sunday, September 24, 2023 at 9:12:19 AM UTC-4, Anthony William Sloman wrote:
> On Sunday, September 24, 2023 at 10:54:03 PM UTC+10, Fred Bloggs wrote:
> > Everyone is aware of the technique of running multiple turns of wire through an ammeter current probe to place the measurement within the meter scale for reasonable accuracy.
> >
> > What's the equivalent procedure for multiplying an electric field measurement/ indication for a non-contact meter?
> Perhaps a
>
> https://en.wikipedia.org/wiki/Field_mill
>
> it's not really the same thing, but turning a static field into AC is a useful trick too.

I think the key may be to concentrate the field, maybe bring it to a point somehow.

>
> --
> Bill Sloman, Sydne

Re: Electric Field Transformer

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Subject: Re: Electric Field Transformer
From: bill.slo...@ieee.org (Anthony William Sloman)
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 by: Anthony William Slom - Sun, 24 Sep 2023 14:35 UTC

On Sunday, September 24, 2023 at 11:56:44 PM UTC+10, Fred Bloggs wrote:
> On Sunday, September 24, 2023 at 9:12:19 AM UTC-4, Anthony William Sloman wrote:
> > On Sunday, September 24, 2023 at 10:54:03 PM UTC+10, Fred Bloggs wrote:
> > > Everyone is aware of the technique of running multiple turns of wire through an ammeter current probe to place the measurement within the meter scale for reasonable accuracy.
> > >
> > > What's the equivalent procedure for multiplying an electric field measurement/ indication for a non-contact meter?
> > Perhaps a
> >
> > https://en.wikipedia.org/wiki/Field_mill
> >
> > it's not really the same thing, but turning a static field into AC is a useful trick too.
> I think the key may be to concentrate the field, maybe bring it to a point somehow.

That gives you steeper electric field gradient, and field emission electron sources do exploit that, but it doesn't do anything for the voltage difference.

There's more capacitance across a narrow gap than a wide one, so you can get more AC current by modulating a narrow gap rather than a wide one in your field mill or vibrating reed electrometer.

https://en.wikipedia.org/wiki/Electrometer

--
Bill Sloman, Sydne

Re: Electric Field Transformer

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From: jl...@997arbor.com (John Larkin)
Newsgroups: sci.electronics.design
Subject: Re: Electric Field Transformer
Date: Sun, 24 Sep 2023 09:21:54 -0700
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 by: John Larkin - Sun, 24 Sep 2023 16:21 UTC

On Sun, 24 Sep 2023 06:35:38 -0700 (PDT), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

>On Sunday, September 24, 2023 at 9:12:19?AM UTC-4, Anthony William Sloman wrote:
>> On Sunday, September 24, 2023 at 10:54:03?PM UTC+10, Fred Bloggs wrote:
>> > Everyone is aware of the technique of running multiple turns of wire through an ammeter current probe to place the measurement within the meter scale for reasonable accuracy.
>> >
>> > What's the equivalent procedure for multiplying an electric field measurement/ indication for a non-contact meter?
>> Perhaps a
>>
>> https://en.wikipedia.org/wiki/Field_mill
>>
>> it's not really the same thing, but turning a static field into AC is a useful trick too.
>
>Right- I'm familiar with that technique. Put the signal in a very narrow band using low noise, offset and drift electronics.
>

Vibrating reed electrometer.

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