On Tue, 29 Jun 1999 14:11:09 +0700 "Roger, in Bangkok" writes: >I have a customer having problems with vacuum leaks (-50 kpa or so >range) in equipment that they manufacture. I expect their >problem is with connectors and seals, and they have asked for help to >locate and correct the problem. Seems simple enough to sniff around >with a tiny microphone. > >Thought...why not develop a simple handheld field >tester...PIC...active filtering...LED bargraph...etc > >Unknowns...are there audio signatures that would allow this...has it >already been cheaply and efficiently done... > I think natural gas distribution companies and telephone companies (who use pressurized cables) use some sort of ultrasonic detector to find leaks. Now and then I see a gas company guy going around with what looks like a metal detector checking for leaks. There's probably some "pipeline supply" company has these things in a catalog. Don't know who, though. Harold Harold Hallikainen harold@hallikainen.com Hallikainen & Friends, Inc. See the FCC Rules at http://hallikainen.com/FccRules and comments filed in LPFM proceeding at http://hallikainen.com/lpfm ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.