Abstract: An optical measurement apparatus operable with a test specimen has a light source with a laser having an output beam, and a beam splitter that splits the output beam of the laser into a first split beam and a second split beam. A test specimen holder holds the test specimen therein. A first optical fiber receives the first split beam and directs the first split beam against the test specimen in the test specimen holder. The apparatus further includes an instrumentation module. A second optical fiber receives the second split beam and conducts the second split beam to the instrumentation module. A third optical fiber receives signal light from the test specimen in the test specimen holder and conducts the signal light to the instrumentation module.

Abstract: A system for providing a measure of the smoothness of a moving web in which light from a source is focused on a spot on the moving web. Light from an arc of substantially 360.degree. around the optical axis is collected and light from 120.degree. sectors of the collected light is reflected to three detectors the outputs of which are processed to provide the smoothness measure.