Patent ID: 6421615
Filing Date: 2002-07-16
Classification: G01H

Abstract:
A torsional vibration measuring instrument comprising:a detection means for detecting a rotational period of an object to be rotated every predetermined angle within a certain number of rotation thereof; a storage means for recording said rotational periods detected by said detection means; an average calculation means for calculating an average of said detected rotational periods; a torsional angle calculation means for calculating a torsional angle of said object to be rotated in comparison between said calculated average and each detected rotational period; a display means for displaying at least an amplitude of said torsional angle; a striped tape serving as said detection means disposed around the periphery of said object to be rotated; a subtraction means for subtracting said detected rotational period from the immediately before or after detected rotational period; a comparison means for comparing said subtracted period with a standard period; and an amendment means for amending said subtracted period, which has a difference from the standard period more than a certain degree determined by said comparison means into an average of periods immediately before and after said subtracted period, wherein said storage means is detachable and portable.