From: Paul
Date: Fri, 15 Jun 2001 20:15:15 +0100
Subject: Re: [TSSP] former materials
Metlicka Marc wrote: > 3k coil-- .091" thick sona tube, no poly top coat, only insulating > varnish > 10-1 coil is .100" thick pvc drain pipe, insulating varnish Thanks. Never mind the other two coils, the most useful results are coming from the 3k and the 10-1, so we'll concentrate on those. > the fiberglass tanks i have are spun glass fiber impregnated with > polyurethane resin, they are .100" thick, very uniform, and sturdy. > if anyone wishes to wind the taped coil that you asked for, i will send > them whatever size they wish. if this sounds suitable? Those tanks sound pretty good, but I'll have to think a little more about just what is required - Finn may be able to turn something on his lathe, which would be the best solution. > i've been looking at an inexpensive digital photometer. this says > it is also used for demodulating optical signals for audio > applications. You'll need to make sure that demodulation will work right up to the Fres of the coil. It still think there must be a simpler way to go about this - if all we want to do is demonstrate that a secondary does show a mechanical vibration, and get a rough idea of the amplitude. No point in taking precise measurements of the amplitude because we don't know how to calculate the power loss from that. What's needed is a simple test to show that mechanical vibration is present, that's all to begin with. Reflecting a cheap laser light off the coil and passing it over a knife edge or through a pin hole some distance away would be an easy way to turn the vibration into an amplitude modulation of the light intensity, which could be picked up with a 50 cent light detector and viewed on the scope. The photometer will tell you the actual light intensity but we're not bothered about that, only whether the modulation is there, so a simple detector would be adequate. Anyway, more about the Cint issue and short coils later on the list, Cheers, -- Paul Nicholson, Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.