I just jumped into the middle of this thread now - sounds really exciting. The liquid crystal idea sounds like a possibility...... My understanding of liquid crystals is that they do not take much of a field to effect but I do not know if it is down in the millivolt/M range that we all care about. I also think that there would have to be a tuning of the specific liquid crystal to the frequency based on physical size, Electrical characteristics and polarity of the crystal. Perhaps one would have different sheets for different frequency ranges or maybe one could mix different liquid crystals.
Another issue is the detection of the effect itself. When the field interacts with the LC they would be alighned differently effecting the polarization of the light. If one used polarized light as a source then the sheet and then polarized glasses perhaps you could actually see an effected area as different intensities of light. Chris Wells cdwe...@stargate.net ..----- Original Message ----- From: Wan Juang Foo <f...@np.edu.sg> To: EMC-PSTC Discussion Group <emc-p...@majordomo.ieee.org> Sent: Tuesday, August 07, 2001 6:28 PM Subject: Re: EMI sniffer goggles > > > I suppose that can be achieve with some class of liquid crystals embedded > in a polymer medium. The problem is that is the representation in the near > field or just a plane (cross section). > > I will prefer a none intrusive gas or vapour that will 'glow' at different > field intensity and colour, very much like a corona or aurora. :-) Now > we can have a glass tank 'gas chamber' within an anechoic chamber to > evaluate the field strengths in 3D. Then the argument will be that there > will be different gasses for different frequent frequency ranges ;-) Just > think about the possible effect on the environment. > > Dreams comes true when we want them to... > > > Tim Foo, > (or just call me 'Tim') > E-mail: f...@np.edu.sg > ECE, School of Engineering, > http://www.np.edu.sg/ece/ Tel: + 65 460 6143 > Ngee Ann Polytechnic, Fax: + 65 467 1730 > 535 Clementi Road, > Singapore 599489 > > > > > "Doug McKean" > <dmck...@corp.auspex.co To: "EMC-PSTC Discussion Group" <emc-p...@majordomo.ieee.org> > m> cc: (bcc: Wan Juang Foo/ece/staff/npnet) > Sent by: Subject: Re: EMI sniffer goggles > owner-emc-pstc@majordom > o.ieee.org > > > 08/08/01 05:18 AM > Please respond to "Doug > McKean" > > > > > > > > Okay, here's what I'd like to have ... > > Translucent material which is color responsive to emi. > Similar to the material on the side of batteries which > responds to voltage levels. > > A pane of translucent material which can be put on the > end of a stick much like a pane of glass or a pane of > of it which could be stood from a floor support next > to the product and show a pattern of emi strengths > by color. > > Or, a thin sheet of it much like plastic wrap which can > be placed on a part of a product (such as a surface or > edge) which would also respond to field strength. > > <snip> > > > > > > > > ------------------------------------------- > 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,"
