Accurate Measurement of Displacement by Means of Sound Frequency in a Resonant Pipe : Experimental Analysis on Effects of Sounding Conditions to Sound Frequency Variation

Abstract

A new accurate measurement of displacement by means of sound frequency variation in a resonant pipe has been investigated. This paper deals with the experimental analysis of the characteristics of the sound frequency variation which is generated in the pipe. In the experiments, the effects to sound frequency variation were examined by changing some sounding conditions. Then, it was made clear that a low sounding mode, short length of the pipe and small inner diameter introduce good results for the measurement of the displacement. By adopting such good conditions, the displacement smaller than 0.1μm can be measured under non-contact conditions with the object.