So, you want to measure the shape of an object, perform a 3D surface scan or conduct surface metrology tests. Google tells us there are many measurement methods to achieve these goals. Problem is, which one’s best for you?
Non-Contact Distance Measurement Technologies article is a god overview to the non-contact measurement sensor technologies – in which the sensor and the object to be measured are separated from each other. There are various optical techniques, each best suited for a different type of application.