Methods For The Calibration Of Vibration And Shock Transducers Shock Calibration By Comparison To A Reference Transducer

Author : D. C. Robinson
Publisher : Forgotten Books
ISBN 13 : 9781396136030
Total Pages : 36 pages
Book Rating : 4.1/5 (36 download)

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Download or read book A Description of Nbs Calibration Services in Mechanical Vibration and Shock (Classic Reprint) written by D. C. Robinson and published by Forgotten Books. This book was released on 2018-09-11 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Description of Nbs Calibration Services in Mechanical Vibration and Shock There are two principal categories of measurement used in the calibration of accelerometers and reference exciters at the National Bureau of Standards: comparison and absolute. When the calibration factor is obtained directly from a measurement of quantities which form the base units of a system of units, the calibration is called absolute The comparison method involves simultaneous measurement of the outputs of the transducer under test and a reference transducer of known and stable characteristics, with both devices subject to the same excitation. The comparison method has been implemented by constructing a vibration exciter with a built-in or attached transducer and a space for mounting an accelerometer to be tested. A test accelerometer can be readily calibrated by direct comparison of its voltage to that of a standard. The comparison method is very simple and relatively inexpensive, compared to the absolute methods of calibration, which can be very time consuming. This survey document describes the methods of calibrating vibration pickups by comparison with nbs standards, including a special shock calibration service, and absolute methods used primarily in the calibration of the reference standards. A summary is given of the various calibration procedures, beginning with the comparison calibration procedures using electrodynamic, air-bearing, and piezoelectric exciters which cover the low, mid, and high-frequency ranges, respectively. A shock calibration service which employs analog-to-digital converters and fast Fourier transform analysis to calibrate a test accelerometer in terms of a reference accelerometer is then described. The last section describes the absolute calibration procedures which are primarily used to calibrate the reference exciters and accelerometers. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.