The Laser-photocell system for the measurement of dynamic displacements - a progress report to date and some suggetions for its further improvement (TN-TAS-038)

The technique consists essentially of using a laser beam as a reference inertialess line, whose origin can be situated several hundred feet away from the structure whose response is to be measured. The light beam falls on to a pair of opposed photo-voltaic cells mounted on the structure and aligned...