Book Description
Excerpt from Self-Study Manual on Optical Radiation Measurements, Vol. 3: Applications, Chapter 1; Measurement of Solar Terrestrial Spectral Irradiance in the Ozone Cut-Off Region Preparation of the nbs self-study Manual on Optical Radiation Measurements is an important part of our effort to meet the needs of the National Measurement System with respect to the measurement of optical electromagnetic radiation. Significant needs exist for measurements with uncertainties of about one percent, but the uncertainties actually achieved are often 5 to 10 percent, or even more. These relatively poor accuracies, as compared to those in many other types of physical measurements, result to a great extent from the multidimensional character of optical radiation; radiant energy is dis tributed and may vary with position, direction, wavelength, polarization, and time. Measurement results are also affected by various instrumental and environmental parameters. In addition, many of those who make measurements of optical radiation have little or no training or experience in this field and are limited in the amount of time they can devote to acquiring the needed information, understanding, and proficiency with measurement techniques. Moreover, there are few schools that offer courses in radiometry, and there are almost no adequate texts or references dealing with this entire subject. 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.