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Excerpt from Measurement of Energy Irradiance From Single Pulse Sources In this paper we describe a method for measuring the amount of energy per unit area, or energy irradiance propagating from a pulsed source such as a xenon flashtube at a given distance from the source. The basic measurement procedure is applicable when the energy is either to be measured spectrally (per unit wavelength) or to be integrated over a spectral bandwidth, such as in the case of photopic (luminous) energy. The latter measure ment was performed as a special calibration by nbs. While preparing for this calibration, it was realized that little previous documentation existed concerning this type of measure ment. Since there is an apparent need for such measurements, this paper is being written to document the procedure we have used at nbs. We will present a specific method of calibrating the energy per unit area of a pulsed source using a continuous (non - pulsed) standard of either irradiance or illuminance (luminous intensity). The theoretical approach will be outlined, followed by a detailed discussion of the factors contributing to the uncertainty of the measurement. As a specific example, we will describe the particular measurement performed at nbs. Finally, we will conclude with a discussion of the treatment of the data, the curve fitting and its inherent problems. 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.

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