The application is industrial. The shape of the objects are non uniform (i.e. one product to the next one), so I cannot be sure of the reflection of the object always with similar angle. Also, the object not only gets closer but moves on the horizontal plane, which will impact the angle. That is why I was looking at a way of trying this with laser.
In addition object moves really fast the 30-50fps sensors are useless and I don't want to fork out a 20K to buy a high speed camera to do this job, hopefully can be done with a few lasers, good electrical design and DSP under 100$.
Thx, KT