Laser Thermometer - morfizm
|Date:||May 12th, 2011 07:20 am (UTC)|| |
i would call it "infrared thermometer", although sometimes they do come with laser pointer just to get an idea of the point where they measure temperature (the spot is usually pretty big - the cheapest have 1 radian angle - i.e. at 1 meter distance they measure "spot" of 1 meter diameter; better ones around 0.1 radian).
Hm... the clerk told me that the one he has is actually quite like a laser. He can point somewhere, like using a laser pointer. He can point through the window and distinguish the temperature of someone's motorcycle engine from the seat. Probably we need to go for a more expensive model. I'll try to check with him again on what exactly is the model he uses.
|Date:||May 12th, 2011 07:35 am (UTC)|| |
I researched them for locating thermo-leaks to insulate house, did not see any with distance-to-spot ratio better than 12.
So if the distance from engine to seat is 30 cm - you can measure them more or less accurately from about 4 meters. Of course you can "distinguish" from bigger distance, but it will just show that engine is hotter than stuff around it, temperature reading will be full B.S.
Got it. Okay, forget about long-distance hot girl spotting :)
Can you tell me what is the name/price of at least one good model (which has over 10 distance-to-spot ratio?)
|Date:||May 12th, 2011 07:47 am (UTC)|| |
Now I see. Cool! I've actually added it to wishlist :)
oh that's the model I have
|Date:||May 12th, 2011 06:41 pm (UTC)|| |
в плане нахождения утечек тепла в доме удобен?
я его в плане готовки использую - очень удобно, единственное он не может измерять у блестящей кастрюли снаружи температуру правильно. а в плане нахождения утечек тепла я ничего сделать не могу, мне стены не принадлежат (ну и в основном стены это окна).
My dad's making similar equipment, except it's precise and costs thousands of bucks. :)http://en.wikipedia.org/wiki/Pyrometer
describes his implementation in general:
"...To get around these difficulties, the ratio or two-color pyrometer was developed. They rely on the fact that Planck's Law, which relates temperature to the intensity of radiation emitted at individual wavelengths, can be solved for temperature if Planck’s statement of the intensities at two different wavelengths is divided. This solution assumes that the emissivity is the same at both wavelengths  and cancels out in the division. This is known as the gray body assumption." And there're some know-hows, of course. It only looks simple to the end-user or the uninitiated, but there's a lot of physics to account for. :) But, I agree, it's pretty cool to aim at something and read back the temperature with great precision.
infrared thermometer is one of four types of thermometers I have in my kitchen. very useful to get quick pasta or frying pan temp reading.
Oooh can't wait till u share the results! :))