SU708288A1

SU708288A1 - Device for effecting the method of photometering of negatives

Info

Publication number: SU708288A1
Application number: SU772514547A
Authority: SU
Inventors: Эдуард Владимирович Кандрашов; Юрий Сергеевич Музалевский
Original assignee: Главная Астрономическая Обсерватория Ан Ссср
Priority date: 1977-08-03
Filing date: 1977-08-03
Publication date: 1980-01-05

Description

Изобретение относитс к области научной фотографии, в частности к фотометрированию негативов, и может быть использовано дл расшифровки спектрограмм и снимков объективов в астрономии,спектральном анализе аэрофотосъемки и т.п.The invention relates to the field of scientific photography, in particular to the photometric measurement of negatives, and can be used to decipher spectrograms and lens images in astronomy, spectral analysis of aerial photography, etc.

Известны устройс гна-денситометры, которые содержат осветитель с оптической системой, выполненной в виде двух ветвей, измерительной и опорной приемник излучени и измерительную систему 1. Однако, в случае.малых экспозиций световой пучок при прохождении через негатив ослабл етс мало и приходитс измер ть малые . изменени большой величины.Devices are known that contain an illuminator with an optical system made in the form of two branches, a measuring and a reference radiation receiver and a measuring system 1. However, in the case of small exposures, the light beam weakly decreases when passing through the negative . large changes.

Наиболее близким вл етс устройство дл осуществлени способа фотометрировани негативов, содержащее осветитель, приемник света и оптику, включающую осветительный и проецирующий объективы и направл ющую свет от осветител на приемник света через исследуемый негатив 2. Однако точность измерени в этом случае невысока.The closest is a device for carrying out a method of photometric measurement of negatives, comprising an illuminator, a light receiver and optics, including illuminating and projecting lenses and directing light from the illuminator to the light receiver through the negative 2. However, the measurement accuracy in this case is low.

Целью изобретени вл етс повышение точности измерени .The aim of the invention is to improve the measurement accuracy.

Цель достигаетс тем, что устройство содержит дополнительно вве-. денную диафрагму дл предотвращени попадани пр мого пучка от осветител на приемАик света в отсутствие светорассеивающей среды, выполненного в виде двух экранов, The goal is achieved in that the device contains an additional input. a diaphragm to prevent the direct beam from the illuminator from getting to the receiver of light in the absence of a light-scattering medium, made in the form of two screens,

0 причем экран, установленный до негатива , имеет отверстие по центру, а установленный после него - непрозрачную центральную зону.0 and the screen installed before the negative, has a hole in the center, and installed after it - an opaque central zone.

На фиг.1 изображена схема устрой5 ства дл осуществлени способа фотометрировани ; на фиг.2 - два сопр женных экрана.Fig. 1 shows a diagram of a device for carrying out a photometric method; Figure 2 shows two mating screens.

Ниже приводитс пример выполнени устройства дл осуществлени спосо0 ба фотометрировани .The following is an example of the implementation of the device for carrying out the method of photometry.

Устройство состоит из осветител Л (лампа накаливани и конденсатор), осветительной (установочной) щели 2, размещенной за осветителем 1 и The device consists of an illuminator L (incandescent lamp and a capacitor), an illumination (installation) slot 2 located behind the illuminator 1 and

5 предназначенной дл того, чтобы освещалс лишь немногим больший участок негатива, нежели измер емый осветительного объектива 3, проецируюпего объектива 4, измерительной5 intended to illuminate only a slightly larger portion of the negative than that measured by the illuminating lens 3, the projection lens 4, the measuring

Claims

0 goal 5, which determines the dimensions of the photometric section of the negative, and the photoelectronic light receiver. Negative 7 is placed between the lenses 3 and 4. The device is equipped with two adjoining screens 8 and 9 with complementary holes. The screen 8 is located in the pupil of the lighting lens 3. The screen 9 is located in a plane where the lens 3 and the projecting lens 4 create an image of the screen 8. Here the opaque places of the screen 9 and the reverse are at the transparent places of the screen 8. Prisms 10 and 11 placed in the circuit serve to compact the device. The method is carried out as follows. The beam of light from illuminator I, bounded by slit 2, with the help of object 3 is focused on the area of the negative under study. Light is scattered on the grains of the negative emulsion. The conjugate; screens 8 and 9 with holes of the complementary shape separate the scattered light from the direct illuminating beam. Then, the light scattered by the negative area under study with the help of objective 4 is directed to a measuring slit 5, which determines the size and shape of Lottometry. An apparatus for carrying out a method of photometric measurement of negatives, comprising an illuminator, a light receiver and optics, including illuminating and projecting lenses and directing light from the illuminator to the light receiver through a negative under study, characterized in that it contains a diaphragm to prevent the direct beam of light from the illuminator to the light receiver in the absence of a light-scattering medium, made in the form of two screens, and the screen Set to negative, it has a hole in the center and mounted - after it opaque central zone. Sources of information taken into account in the examination 1.Shishlovsky A.A. Applied physical optics. M.-, Khos.izd. Physics and Mathematics., 1961, s, 372.

2. Gorokhovsky, Yu.M., and Levinberg, T.M. General sensitometry. M., Art, 1963, pp.185-186 (PROTOTYPE.

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