Optical measurement refers to noncontact measurement utilizing various light sources. It normally requires not less than one lens, a light source and a detector. It differs from other forms of inspection in that instead of using a tactile measurement method like a contact probe, it uses either a degree of reference (e.g. a crosshair) or a computer to calculate edge detection. Two of its greatest benefits are its capability to measure features too small or fragile to measure by contact,…