On Wed, 15 Jul 2015 08:53:19 -0700,
wrote:
On Wed, 15 Jul 2015 17:40:21 +1000, Jon Anderson
wrote:
I was just looking at some of my IR photos, and realized asphalt comes
up dead black, near zero reflectance. Maybe give a clue to materials
that absorb. Suspect maybe rubber might absorb too. Maybe a patch of
innertube stapled to the underside of the counter?
Jon
If I can't find some paper or fabric to work I do have some rubber
sheet I copuld try. Thanks.
Eric,
It has been a few years since I dealt with IR, and that was near IR (e.g.
your typical remote control):
https://en.wikipedia.org/wiki/Infrar...n_the_infrared
I was attempting to make a small robot's IR reflectance sensors work so
it would follow a black line, but a number of visible-light "black"
substances did not have any effect (the sensor couldn't distinguish them
from plain white):
- InkJet black ink (water-based)
- Permanent markers (those tested)
- Black acrylic paint
- At least one marker claiming to be "pigmented"
These _were_ noticed:
- Laser printer "black" (fused plastic toner)
- Black tempera paint
- Strips of black supermarket-chicken containers (both the foamy kind
and the flat plastic kind)
I was _told_ that most "pigmented" paints, markers would absorb IR (at
least near IR), but my own results were mixed -- possibly a tribute to
American Marketing's triumph over providing clear information. ( Sigh. )
Just for grins, if you have access to a laser printer, try printing a
solid black square of "sufficient size" and hold/tape it in place to see
if it helps.
Good luck...
Frank McKenney
--
A beginning naturalist, fired by adolescent enthusiasm but short
theory and vision, I had schooled myself in natural history with
field guides carried in a satchel during solitary excursions into
the woodlands and along the freshwater streams of my native state.
I saw science, by which I meant (and in my heart I still mean) the
study of ants, frogs, and snakes, as a wonderful way to stay
outdoors. -- Edward O. Wilson, "Consilience"
--
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
Munged E-mail: frank uscore mckenney aatt mindspring ddoott com