Take a look at www.roboticsonline.com for more information about the various robot companies. You can post this question in their "ask the experts" section.
I would say about 1/3 to 1/2 of the industrial robots have some kind of collision sensor. The most prominent is software on the robot reading the current in the servo motors. The software looks for current signature that indicates a crash and stops the robot. Most of the large robots have...
