Patent ID: 6286359
Filing Date: 2001-09-11
Classification: G01N,G02F

Abstract:
A method for testing frequency response characteristics of a laser displacement/vibration meter, comprising the steps of: applying impact on one end face of a round metal rod to produce an elastic wave pulse propagating toward the other end of said metal rod to generate pulse-like dynamic displacements thereat by reflection of said elastic wave pulse; measuring the dynamic displacements of said other end face of said metal rod simultaneously by a strain gage bonded on said round metal rod and a laser displacement/vibration meter with unknown frequency characteristics; preliminarily assessing frequency response characteristics of said unknown laser displacement/vibration meter by comparison of measurement data with the counterpart measurement data of said strain gage over a frequency range; and finally determining the frequency response characteristics of said laser displacement/vibration meter by application of a corrective function for dynamic characteristics of said strain gage as prepared in advance by the use of a reference laser interferometer with a reference laser beam.