Measuring vehicle distance
I'm still in the planning stages of one of my projects, a telemetry system for my car. One of the function's I'd like to implement is a detector to measure distance of the car in front, which I can then calculate relative velocity.
The most practical solution would be using laser as the range finder, using speed of light and time of flight for calculations. However, I'm having difficulty in locating Class 1 laser modules/pointers. Of course, there are cheap laser pointers out there, but since they are mostly Class 2, I'm definitely NOT using those on the road.
I might get a 2nd hand rangefinder used in golf (Bushnell Yardage Pro Sport 450) and hack it. Range of about 200m is quite decent, though I'm quite stumped on how a Class 1 laser can achieve that distance.
Anybody know where I can get a long range Class 1 laser modules? I'd probably need to also mount a scope or monocular to the detector. The assumption of all this is that I'm driving on a straight flat road, ignoring any azimuth or elevated deviations of my target car.