If you had one what would you use it for
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From: MooseFET on 21 Oct 2009 09:21 Imagine you had a sensor that could measure very small magnetic fields. It measures with a noise floor of about 0.1fT. Unfortunately the band width is only a few hundred Hz and it only works inside a shield. What would you use such a sensor for? The best I've thought of is detecting the flow of current in a PCB to find a short circuit.
From: Adrian C on 21 Oct 2009 10:04 MooseFET wrote: > Imagine you had a sensor that could measure very small magnetic > fields. It measures with a noise floor of about 0.1fT. Unfortunately > the band width is only a few hundred Hz and it only works inside a > shield. > > What would you use such a sensor for? The best I've thought of is > detecting the flow of current in a PCB to find a short circuit. Make something to quickly detect if it's the inverter, cable or tube that has failed on a dead laptop / LCD monitor without having to uncase all of it? -- Adrian C
From: Spehro Pefhany on 21 Oct 2009 10:24 On Wed, 21 Oct 2009 06:21:02 -0700 (PDT), MooseFET <kensmith(a)rahul.net> wrote: > >Imagine you had a sensor that could measure very small magnetic >fields. It measures with a noise floor of about 0.1fT. Per root Hz? > Unfortunately >the band width is only a few hundred Hz and it only works inside a >shield. >What would you use such a sensor for? The best I've thought of is >detecting the flow of current in a PCB to find a short circuit. Nano (or maybe pico) voltmeter. What are you talking about? A SERF magnetometer?
From: John Larkin on 21 Oct 2009 10:37 On Wed, 21 Oct 2009 06:21:02 -0700 (PDT), MooseFET <kensmith(a)rahul.net> wrote: > >Imagine you had a sensor that could measure very small magnetic >fields. It measures with a noise floor of about 0.1fT. Unfortunately >the band width is only a few hundred Hz and it only works inside a >shield. > >What would you use such a sensor for? The best I've thought of is >detecting the flow of current in a PCB to find a short circuit. You need high spatial resolution for a general-purpose board short finder. Magnetically, you can do it with a pulsed current source and a really tiny ferrite-core pickup coil. I do it lately with a DC source and a thermal imager, so you can *see* the current path. John
From: Jim Thompson on 21 Oct 2009 10:51 On Wed, 21 Oct 2009 07:37:36 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Wed, 21 Oct 2009 06:21:02 -0700 (PDT), MooseFET ><kensmith(a)rahul.net> wrote: > >> >>Imagine you had a sensor that could measure very small magnetic >>fields. It measures with a noise floor of about 0.1fT. Unfortunately >>the band width is only a few hundred Hz and it only works inside a >>shield. >> >>What would you use such a sensor for? The best I've thought of is >>detecting the flow of current in a PCB to find a short circuit. > >You need high spatial resolution for a general-purpose board short >finder. Magnetically, you can do it with a pulsed current source and a >really tiny ferrite-core pickup coil. I do it lately with a DC source >and a thermal imager, so you can *see* the current path. > >John A microvolt meter makes short finding trivial. Somewhere back in time I posted how I made my own at GenRad in the late '70's ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Cranky Old Git With Engineering Mind Faster Than a Speeding Prissy
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