[Ronja] Pyroelectric receiver?

[Arun Krishnan]

Hi,

$100? A whole RONJA kit costs less than that to make yo.

Regards,
Arun


----- Original message -----
From: "alex dinovitser" <adinov at yahoo.com>
To: "Twibright Ronja" <ronja at lists.pointless.net>
Date: Thu, 29 Nov 2007 21:56:26 -0800 (PST)
Subject: Re: [Ronja] Pyroelectric receiver?

I also thought these detectors were slow, until a colleague of mine
showed me a
device (that he'd just blown up with a laser pulse!). 

There are probably many different manufacturers, probably cheaper than
this
($100) laboratory device from "Molectron" 
Called the "P1-60" with a flat frequency response of 70MHz. The largest
version, the P1-65 has an active diameter of 5mm or ~20mm^2, if you need
that
much!


--- Gregory Maxwell <gmaxwell at gmail.com> wrote:

> On Nov 29, 2007 9:38 PM, alex dinovitser <adinov at yahoo.com> wrote:
> > I am surprised you are using a photodiade for this application because of
> the
> > problems with ambient light and the possibility of DC saturation. Why not
> use a
> > pyroelectric receiver? (which will only be sensitive to the AC signal).
> With a
> > larger area device, you might be able to get *much* better range!!
> 
> I can't comment on the Ronja design decisions but I'm puzzled by your
> suggestion. I've never seen a pyroelectric detector that was very
> past. Most that I've seen have a bandpass no more than 100kHz or so,
> while ronja needs a bandpass of many mHz.
> 
> Perhaps I just haven't been following pytoelectric detector science.
> Could you suggest a part that you think might better fit ronja than
> the current PIN diode?
> 
> -- 
> Twibright Ronja mailing list http://ronja.twibright.com
> Ronja at lists.pointless.net
> http://pointless.net/mailman/listinfo/ronja
> 



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