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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: cheap IR camera?
Date: Fri, 20 Sep 2002 10:41:38 +0200
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NNTP-Posting-Date: 20 Sep 2002 10:40:30 MEST
Ian Stirling a écrit dans le message :
> In sci.electronics.design Leon Heller wrote:
> > "George Gonzalez" wrote in message
> > news:54ji9.145941$Jo.45144@rwcrnsc53...
> >> Lately I've been resuscitating a pallet-load of Tek 465 and 475 scopes.
> >> Some have easy-to-find problems with the power supply-- dried up
> >> electrolitics,
> >> bad bridge rectifiers.
> >> Most of the rest have shorted tantalum capacitors from one of the power
> >> supplies (-8, -15, +5, +15) to ground. These are a bit difficult to
> > find,
> >> as there are many caps sprinkled around the boards. The method I'm
> >> now is to push a few amps into the shorted power bus with an external
> > power
> >> supply, then feel around for warm or hot capacitors.
> >> This isnt a very good method, as it's hard on the series decoupling
> > chokes,
> >> wound with like #30 wire, they get a lot warmer than optimum. Also
> >> depending on the severity of the short, the capacitor can get anything
> > from
> >> just barely warm, to finger-burning HOT.
> >> Are there any reasonably priced IR sensors, like a small CCD TV camera?
> >> Last one I saw was 1000's of $, but that was a couple decades ago.
> > CCDs tend to be quite sensitive to IR. You could try putting an ambient
> > light filter in front of an ordinary camera and see if it will detect
> > emitted by the hot components.
> Umm, no.
> CCDs are sensitive to at most about 1000nm, and that at very low levels.
> If it's hot enough to be emitting that sort of light, it'll be at
> around 500C or so.
A friend of mine have one camcorder (Sony IIRC) that has an IR mode. We
tested it and could clearly see ourselves in the dark.
Worth a try if you have an ordinary one.
I also could ask him the ref if you're interested.
> There are easier ways to find this.
> (the smoke arising from the component in question should be a subtle clue)
> http://inquisitor.i.am/ | mailto:firstname.lastname@example.org | Ian
> What a wonderfull world it is that has girls in it! -- Robert A
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