Ok,
Lets start with the optics. First of all a simple lense will no do due to the
fact that most lenses do not pass infrared very well. The best means of
focusing to a point source would be a first surface mirror.
What is the emissivity of the seal. If it is glass it is very low, if ceramic
it will be higher. You could increase it by coating it with dag, a paint
containing graphite. However it is conductive. You will have to calibrate the
whole thing by heating the seal to a known temperature and making a
measurement.
What about the strong RF fields around the instrument?
I don't think it is practical.
73
Bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
Radio WC6W [wc6w_amps@yahoo.com]
Sent: Monday, July 06, 2009 12:07 PM
To: Alex Eban; amps@contesting.com
Subject: Re: [Amps] monitoring tube seal temps
Hi Alex,
Those parts won't suffice in this application.
They work by summing the signal across multiple (2 or more) areas of the chip
and don't produce an absolute output; Essentially an AC device.
73 & Good morning,
Marv WC6W
http://wc6w.50webs.com/
--- On Sun, 7/5/09, Alex Eban <alexeban@gmail.com> wrote:
> From: Alex Eban <alexeban@gmail.com>
> Subject: Re: [Amps] monitoring tube seal temps
> To: dezrat1242@yahoo.com, Amps@contesting.com
> Date: Sunday, July 5, 2009, 11:15 PM
> You can probably use the pyroelectric
> detector from a junked IR movement
> detector use in burglar alarms. They are quite sensitive
> and you can use
> very simple optics, if needed, to measure temperature at
> choice points. Of
> course you have to calibrate them, but since this is
> entails only setting
> the trip point at a fixed distance, it should be quite easy
> to do. The
> electronics should be simple: a comparator should suffice.
> Alex 4Z5KS
>
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