Dear Crispin
I did another experiment a follows:
Basically, I had a piece of heavy wool cloth as a "background." I "shot the
mirror" at various angles, with the wool cloth intercepting the "red dot"
after it bounced off the mirror.
1: A direct temperature reading of the wool cloth was 62 F
2: Very Shallow angular reflection of the mirror and onto the cloth gave 62
F also.
3: When I "shot directly" at the mirror, with the face of the instrument
directly on the mirror, I read 57 F.
4|: As I increased the angle of the beam, the observed temperature fell
relatively uniformly from 62 to 57. (Eg, at 40 to 50 degree angle, the
indicated temperature was about 51 to 50 F
Best wishes,
Kevin
----- Original Message -----
From: "Crispin Pemberton-Pigott" <[email protected]>
To: "Discussion of biomass cooking stoves" <[email protected]>
Sent: Thursday, March 08, 2012 11:35 PM
Subject: Re: [Stoves] radiant heat capture, total heat measurement
Dear Kevin
I have enjoyed your experiments. I was wondering I you could get a
different temperature from the mirror by trying to receive different
incident angles. At some point there will be a very effective reflection
off the surface of the glass, not the mirrored surface behind it.
Because glass is a pretty good absorber of IR it is also a pretty good
emitter.
One thing for sure, when testing a new surface you should calibrate the
emissivity using a contact thermocouple - often provided with the unit if
the emissivity is adjustable. Frank has that sort.
Regards
Crispin
PS anyone see the CME impact in N America?
-----Original Message-----
From: "Kevin" <[email protected]>
Sender: [email protected]
Date: Thu, 8 Mar 2012 22:23:06
To: <[email protected]>; Discussion of biomass cooking
stoves<[email protected]>
Reply-To: Discussion of biomass cooking stoves
<[email protected]>
Subject: Re: [Stoves] radiant heat capture, total heat measurement
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