Download Air Survey of Sand Deposits by Spectral Luminance by Mariya A. Romanova PDF

By Mariya A. Romanova

This ebook offers an account of a mode of picking the kind composition of sandy deposits from the air by means of 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 typical is the elemental estate thought of during this approach. The spectral luminance components p\ are measured by way of unique tools - a common photometer, cinespectrograph, spectro­ visors, and different spectrometers. The measured values of P" of the investigated rocks are interpreted geologically by way of a few tools of mathematical information 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, basically sandy de­ posits, from the air stems from the huge incidence of deserts at the earth's floor. Sandy deserts occupy large parts within the southern latitudes of the USSR and ensue in western and principal 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 consistently in development. winning prospecting for the above minerals will depend on 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 through a examine of the dis­ tribution of lithological forms of sands.

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The values of the luminance factors of the investigated surface are taken every 5 or every 10° according to requirements. It is more convenient to perform the measurements with the beam carrying the photometer in a fixed position and varying angles of the lamp: i = 10, 20, 30, 40, 50. 60, 70, 80, and 90·. The bea m should then be turned around its axis through 5 or 10·, and another series of measurements of the luminance of the investigated surface at different angles i is carried out. 4) The luminance factors for the construction of the indica trices of diffusion are calculated from the formula Bi .

2) The axis of rotation 00' of the lamp. which is mounted on the end of a large arc; by rotation of the arc the angle of incidence of the light flux on the investigated surface can be accurately set; the angle i can be varied from 0 to :I: 90·. 3) The axis ee' is the axis of rotation of the photometer. which analyzes the intensity of the light beam reflected from the investigated surface. In the indicatometer of the Astronomical Observatory of Leningrad State University the axis is stabilized. The axis of the object stage, on which the specimen for measurement is mounted.

34. The instrument is based on the same general principle as all other photometers; the equalization of two light fluxes reflected from two different surfaces, one of which has been adopted as a standard. 0' The optical system of the photometer is shown in Fig. 35. The two light fluxes from the standard I and the specimen II pass through the objectives 5 and the rhombic prisms 6 to the biprism 7, which a' brings the two light fluxes onto the axis of the eyepiece 8. In the field of the eyepiece the observer sees a circle divided into two Fig.

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