Q
Quack
- Jan 1, 1970
- 0
Hi,
I need to detect the presence of 3 colors at a maximum distance of
7-10cm. (fixed distance, position, orientation etc).
The colors are very specific and cannot be altered - the light
conditions are also fixed - bright indoor lighting (think casino).
The colors fly by very fast, and they are BRIGHT RED, DULL GREEN and
BLACK.
Thats right - reading results from a roulette wheel.
I baught a "BALLUFF BKT" LASER sensor. (www.quack.cc/36970.pdf)
This detects the RED/Black perfectly but i cant make it distinguish
the green from the black . (it has a teach function, but it doesnt
see enough of a difference in contrast i guess).
I liked this sensor because it used a visible laser diode (aiming is
important) and it has fast reaction time and a long sensing range. the
documentation says upto 15cm - but in reality i had it upto 25.
So i am looking for a "green color" sensor - more specific than just a
'contrast' sensor. It needs a range of about 7-10 cm, and if possible,
a visible aiming mark.
I read somewhere that a red led/laser will not pickup greens well
because green absorbs most red light - and i have seen "green led"
contrast scanners around - but only for short-range .
does anyone knows of a green-led/laser contrast scanner with a better
than 2cm maximum range ?
Thanks
Alex.
I need to detect the presence of 3 colors at a maximum distance of
7-10cm. (fixed distance, position, orientation etc).
The colors are very specific and cannot be altered - the light
conditions are also fixed - bright indoor lighting (think casino).
The colors fly by very fast, and they are BRIGHT RED, DULL GREEN and
BLACK.
Thats right - reading results from a roulette wheel.
I baught a "BALLUFF BKT" LASER sensor. (www.quack.cc/36970.pdf)
This detects the RED/Black perfectly but i cant make it distinguish
the green from the black . (it has a teach function, but it doesnt
see enough of a difference in contrast i guess).
I liked this sensor because it used a visible laser diode (aiming is
important) and it has fast reaction time and a long sensing range. the
documentation says upto 15cm - but in reality i had it upto 25.
So i am looking for a "green color" sensor - more specific than just a
'contrast' sensor. It needs a range of about 7-10 cm, and if possible,
a visible aiming mark.
I read somewhere that a red led/laser will not pickup greens well
because green absorbs most red light - and i have seen "green led"
contrast scanners around - but only for short-range .
does anyone knows of a green-led/laser contrast scanner with a better
than 2cm maximum range ?
Thanks
Alex.