SU39422A1 - Reflectometer - Google Patents

Description

In many cases of laboratory and factory practice, it is necessary to quickly and conveniently measure the total coefficient of reflection of light from any surface — specular, diffuse, or mixed-reflection.

; Instruments designed for this purpose have various disadvantages. Either they require several measurements from different angles for determining the value of the coefficient - for example, the device according to the author's certificate No. 38343, or, as a Taylor reflectometer manufactured by the VOOMPa experimental plant (Taylor ball) is not a ready-to-use device, For the operation of which, an additional accurate photometer, electrical measuring instruments and often separate power sources (batteries) are required. .

The proposed device avoids all the difficulties and is a combination of parts, their ability to get results without any additional devices, using only the current from the lighting network and, moreover, using the minimum number of readings made.

The device is basically a Taylor ball, in which the light beam is moved, not by rotating the illuminator, but by turning the prism, with a fixed light source, which simultaneously illuminates another field of the photometric device attached fixedly to the main ball.

This use of a single light source to illuminate both parts of the field of view compared by the eye represents the great advantages already used, for example, in author's certificates No. 38343 and N ° 38344. They are reduced to the fact that during measurements there is no need to fear voltage fluctuations current source, very dangerous for the accuracy of the result when working with two light sources. At the same time, it is possible to operate from the lighting network (separate batteries are usually used) and there is no need to use precise electrical measuring instruments to control the constancy of the electrical mode of the light sources.

In FIG. Figures 1 and 2 depict a reflectometer in two mutually perpendicular sections.

The photometric part of the device is a gray neutral wedge K, moving in a special box; The wedge K makes it possible to equalize the brightness of the visible parts of the field of view. The ocular tube O through a wedge is directed to the surface C of the wall of the ball, which is coated on the inside with white matte paint. in one position of the prism P, the beam of light from the lamp S falls on the test sample applied to the hole A in the wall of the ball. From the surface of the wall opening L is closed with an opaque screen. In a different position of the prism, the beam hits the opposite wall of the hole A of the ball B, which is not covered by anything from point C.

As is well known, the ratio of the wall wall wall rusts gives, under these conditions, the total reflection coefficient of the test sample.

The subject matter of the invention.

Claims (2)

1. Reflectometer, compounded from a Taylor ball with one common light source ) See. M. M. Gurevich. "Light measurements." Training center of citizens air fleet. Leningrad, 1934  . 1: Chg: G1 VN} GrenNZI The surface of the ball and the comparison field, for example, of the Lummer cube, characterized by the use of a movable prism P of total internal reflection, which serves to direct the rays of the light source 5 once to the test surface attached to the hole L in the ball and separated from the surface C against the ocular tube O with the screen, and another time onto the wall B of the ball, not shielded from the surface C of the ball and located diametrically opposite to the hole L. 2. In the reflectometer according to claim 1, use a path of the rays from the surface C of the ball cavity to the ocular tube O of the movable gray neutral wedge K to equalize the brightness of the visible parts of the field of view.