Along the lines of "EMI sensitive paper"... There is such a thing for viewing magnetic fields, funnily enough. Its called "Magnetic Viewing Paper" and McMaster Carr has it for $14.22 for 27 square inches, p/n 5702K21. When the paper is laid over magnets, the paper shows the outline and shape of the field lines. Its handy for checking magnet assemblies for motors, and I have seen it used for this purpose.
Another interesting paper is the new "electronic paper" being developed for electronic books. Embedded in the construction of the paper are millions of tiny spheres. Half of each sphere is black, half white. The spheres are aligned during the "printing" process with magnetic fields to show light or dark areas. There were photos and an article in the new issue of one of the free design rags that pile up on my desk. And don't forget that X-rays have been used to expose film for over 100 years. Sounds like we're "just" missing something sensitive to the portion of the spectrum between DC and X-rays! ;-) -Andy Andrew Veit Systems Design Engineer MTS Systems Corp Ph: 919.677.2507 Fax: 919.677.2480 1001 Sheldon Drive Cary, NC 27513 -----Original Message----- From: Doug McKean [mailto:dmck...@corp.auspex.com] Sent: Tuesday, August 07, 2001 5:18 PM To: EMC-PSTC Discussion Group Subject: Re: EMI sniffer goggles 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. Or, I could rip off a sheet much like plastic wrap about a foot long and place over a pcb and instantly "see" the emi patterns produced by the board. Near or far field use. There'd be 2 versions of the material: one for electric fields which would respond with various shades of red and another for magnetic fields which would respond in various shades of blue. - Doug McKean ------------------------------------------- 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,"
