By Mariya A. Romanova
This publication supplies an account of a style of making a choice on the sort composition of sandy deposits from the air via the character in their mirrored image of radiant power. The measured spectral luminance of a rock outcrop rela ti ve to the luminance of a customary is the fundamental estate thought of during this process. The spectral luminance elements p\ are measured through specific tools - a common photometer, cinespectrograph, spectro visors, and different spectrometers. The measured values of P" of the investigated rocks are interpreted geologically via a few equipment of mathematical facts in order that a method of lithological mapping of sandy deposits from the air are available. the significance of constructing a mode of deciding upon the sort composition of rocks, essentially sandy de posits, from the air stems from the broad incidence of deserts at the earth's floor. Sandy deserts occupy big components within the southern latitudes of the USSR and ensue in western and critical China, Pakistan, Iran, India, and different states. In those deserts there are many deposits of petroleum and gasoline, and a look for water is regularly in growth. profitable prospecting for the above minerals is determined by a decision of the fabric composition of the sandy deposits in those deserts and the answer of a number of questions of modern tec tonics, paleogeography, and quaternary geology, the solutions to which would even be given via a research of the dis tribution of lithological kinds of sands.
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Additional info for Air Survey of Sand Deposits by Spectral Luminance
Linear spectral characteristics of aerial cinespectrographRShch-lfrom measurement of photographed spectrum of iron. A u=U Ii ' H and. hence, substituting the value of 1:::.. we obtain In calculation of the size of the photometered area. the width 0 of the spectrogra ph slit must be taken into account as well as the flight altitude H and the focal length fc of the spectrograph objecti ve. The slit width is set by a special screw before the start of the work. The above-indicated (see Fig. 193 mm is given in Table 4.
Photograph by K. E. Meleshko. r€ I ~- -- ---- --- - -- - Fig. 44. Block diagram of 1959 model spectrovisor. , over the wavelength range; 8) cathode-ray tube with screen displaying a curve characterizing the spectral distribution of the reflected radiant energy; 9) cinecamera for photographing the curve from the screen of the cathode-ray tube (lens a) and the image of the photo metered surface (lens b). , 1958; Mironova and D'yachkova, 1957). Only a few types of these spectrometers have been designed for aerial spectrophotometry and can be used for the photometry of geological objects from airplane (helicopter).
The conditions of illumination were practically the same as in photometry of the dune (clear, cloudless sky, same time of day). The nature of the curves of P>.. obtained by photometry of sands with a disturbed structure is shown in Fig. 21 (curves b). A repetition of the measurements of f\ in stationary conditions, where the effect of the changes in the angle of incidence of the light flux was excluded, showed that in this case the nature of the curves of P>.. was affected by the variation of the granulometric and mineralogical composition of the sands within the barchan itself due to the eolic differentiation of the fragmentary material comprising the barchan.