Long Distance Retro Reflective Sensor

[sibon3]

I'm looking for information on a retro reflective sensor that can cover 100 foot range that can be used with Raspberry PI. Everything I have seen is for short distances under 3 feet.

[rotwang]

I assume you are using a laser, as I don't see anything else making that distance, try searching for "corner cube" which is an arrangement of three mutually perpendicular reflectors, either in the form of mirrors or a glass cube.
You will however require very rigid mountings at that range, and getting the laser aimed at the reflector is going to be a challenge.

I'm looking for information on a retro reflective sensor that can cover 100 foot range that can be used with Raspberry PI. Everything I have seen is for short distances under 3 feet.

[PiGraham]

I'm looking for information on a retro reflective sensor that can cover 100 foot range that can be used with Raspberry PI. Everything I have seen is for short distances under 3 feet.

Such sensors exist, but may cost more than you have in mind.
http://www.keyence.co.uk/products/senso ... ion-08.jsp can do 30m (100ft)

[Heater]

I have one these to evaluate form work:
http://www.noptel.com/eng2/FastDistance ... ucts/5_cm5
2 to 380 meters range if you have a reflective target.

Only about 2500 Euros.

Or you might like the Parallax range finder. 0 to 59 meters for $349.
https://www.parallax.com/product/28043

Or this for 100 meters
https://www.parallax.com/product/28058

or this for 50 meters.
https://www.parallax.com/product/28057

[PiGraham]

If you don't absolutely need retroreflective you can find some much more affordable through-beam sensors.
Such as this Outdoor 100m Double Beam Security Active IR Detector ABT-100