[Amps] monitoring tube seal temps

[Fuqua, Bill L]

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 at contesting.com [amps-bounces at contesting.com] On Behalf Of Radio WC6W [wc6w_amps at yahoo.com]
Sent: Monday, July 06, 2009 12:07 PM
To: Alex Eban; amps at 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 at gmail.com> wrote:

> From: Alex Eban <alexeban at gmail.com>
> Subject: Re: [Amps] monitoring tube seal temps
> To: dezrat1242 at yahoo.com, Amps at 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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