By Mariya A. Romanova
This publication offers an account of a mode of picking the kind 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 procedure. The spectral luminance components p\ are measured via targeted tools - a common photometer, cinespectrograph, spectro visors, and different spectrometers. The measured values of P" of the investigated rocks are interpreted geologically because of a few equipment of mathematical records in order that a way of lithological mapping of sandy deposits from the air are available. the significance of constructing a mode of deciding upon the kind composition of rocks, essentially sandy de posits, from the air stems from the large prevalence of deserts at the earth's floor. Sandy deserts occupy big components within the southern latitudes of the USSR and happen in western and primary China, Pakistan, Iran, India, and different states. In those deserts there are lots of deposits of petroleum and fuel, and a look for water is continually in growth. profitable prospecting for the above minerals is determined by a choice of the cloth composition of the sandy deposits in those deserts and the answer of a number of questions of contemporary tec tonics, paleogeography, and quaternary geology, the solutions to which would even be given by way of a research of the dis tribution of lithological varieties of sands.
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Additional info for Air Survey of Sand Deposits by Spectral Luminance
Vacuum photoemissive cells have been found to be suitable radiation receivers in conditions of low light intensity. The photocurrent of these devices is easily amplified electronically. A photocell with subsequent multistage secondary-emission amplification (photomultiplier) provides a means of measuring small radiant fluxes. down to 10 _9 1m or even less (Volosov, 1960). , 1959; Boiko. 1959; Voronkova et ai.. 1960; 42 Fig. 43. General view of spectrovisor outfit. 1) Monochromator; 2) supply unit; 3) batteries for supplying incandescent lamp of illuminators.
Hence, it is quite understandable that photometry by means of this instrument is impossible from any moving vehicle, to say nothing of photometry from an airplane or helicopter. In view of this it became necessary to design special instruments - spectrometers, which enable rapid photometry of small areas of the earth's surface from the air. Field Spectrometers" The main requirements of field spectrometers are rapidity of recording reflection spectra, stability of operation, and durability in transport.
The instrument was mounted on 1lll open platform and the measurements were made in the sequence: standard - sample - standard. The results of this photometry are illustrated in Fig. 20, which shows that out of the obtained series of almost identical spectral luminance curves the curves obtained at 9 AM (dashed line), 4 PM (dotted line), and 5 PM (dot-dash line) deviated slightly from the rest. In this case the nature of the spectral luminance curves of the photometered sand sample was affected by the change in the angle i, determined by the height of the sun above the horizon (h o) and, possibly.
Air Survey of Sand Deposits by Spectral Luminance by Mariya A. Romanova