You could use an array of very short dipoles or small loops and gain in resolution by giving up efficiency, meaning that the viewer would have to be near the source. Although I have no detailed knowledge of it, I expect this is the principle behind the devices upon which you lay an operating PCB and the device maps hot spots. But clearly you will never get optical or IR viewer resolutions.
---------- >From: John Woodgate <j...@jmwa.demon.co.uk> >To: emc-p...@majordomo.ieee.org >Subject: Re: TV nostalgia >Date: Mon, Aug 6, 2001, 12:28 PM > > > <95fbd8b0830ed511b7720002a51363f1319...@exw-ks.ks.lsil.com>, Ehler, Kyle > <keh...@lsil.com> inimitably wrote: >> Doug has touched on what I think would be a great tool for the >> EMI hunter...but rather than a 'sniffer', a 'goggle' similar >> to what Geordi wears that facilitates the direct viewing of EM radiation. >> >> Ideally, the device would allow adjustable band 'viewing' of the radiation >> frequency, intensity, polarity and propagation pattern(s). > > Yes, it sounds much more attractive than a sniffer, which would produce > BAD smells around some equipment. And it isn't technically unfeasible. > The problem is the poor resolution, even a microwave frequencies, due to > the wavelength of the emission. At 150 kHz, the wavelength is 2 km, so > only very BIG things are visible. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > This message and its contents are not confidential, privileged or protected > by law. Access is only authorised by the intended recipient - this means YOU! > The contents may be disclosed to, or used by, anyone and stored or copied in > any medium. If you are not the intended recipient, please advise the sender > yesterday at the latest. > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave Heald davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > http://www.rcic.com/ click on "Virtual Conference Hall," > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
