Method and apparatus for controlling a materials processing stream system

For monitoring workpiece filament processing device and system, and method, comprising a guide incidence laser beam of work piece, and steps with optical detection taking incident laser beam the result, comprising a signal of the workpiece is expanding. The detection produced at least two signals based on optical signal. The method also comprises two outputs-based the bolt and sizes of two bolt, and light source controller to determine the workpiece processing process quality.