SU800676A1 - Apparatus for subjective spectral correction of radiation receiver - Google Patents

Description

(54) DEVICE FOR SUBTRACTIVE SPECTRAL CORRIGATION OF A RADIATION RECEIVER

The invention relates to a measurement technique, in particular, to DEVICES, the spectral sensitivity of which is corrected by a subsection of this spectral sensitivity function, for example, to the spectral sensitivity of a human eye or a plant leaf, and can be used in photometry.

A device for spectral correction of a radiation detector is known, consisting of spaced light rays of flat-parallel plates of color filters overlapping the photosensitive surface of the radiation receiver 1.

The implementation of the spectral correction in this case is associated with the calculation and production of light filters of optimum thickness and in each particular case of their selection. The selection of the thickness of the optical filters is necessary in order to take into account the individual spectral sensitivity, the radiation detector and the individual: the optical characteristics of the optical filters. Selection of discrete values of thicknesses of light filters for a keikd of a sample of a radiation receiver is laborious, time consuming and expensive.

a swarm associated with repeated grinding of light filters to change thicknesses and checking the spectral sensitivity of the device assembly.

The closest in technical essence to the present invention is a device for subtractive spectral correction of radiation receiver 5, which contains light filters, prismatic transparent elements, milk glass and radiation receiver 2. The main drawback of the device is associated with an increase in the consumption of colored glass and its processing volume more than twice, since each filter consists of two parts and the manufacture of the wedge is much more complicated than the manufacture of plane-parallel plates.

The purpose of the invention is to extend the technology and reduce the complexity of the manufacture of the device ..

This goal is achieved by

5 that prismatic transparent elements form rigidly coupled pairs, between the parallel edges of which light filters are placed, with. this prismatic transparent pairs

Claims (2)

0 is movable; In the direction perpendicular to the optical axis, and made of a non-selective optical material. The drawing shows a device diagram. The device consists of transparent elements 1, 3, 4 and 5, color light filters 2 and 6, milk glass 7 and radiation receiver 8. Mixing and communication of elements is provided by blocks 9. Light filters 2 and 6 are partially or completely covered by a pair of mutually opposite prismatic transparent elements 1 and 3; 4 and 5 (prismatic elements in the form of optical wedges are depicted for clarity). As optical prismatic elements, devices similar to the Fresnel lens can also be used, but not with a concentric, but parallel arrangement of prisms. The device works as follows. The radiation incident normally to the surface of the light filter enters a transparent spectrally non-selective prismatic element 1 made of polystyrene, plexiglas or other similar material. The primitive element rejects the radiation, as a result of which it passes through the light filter 2 at a certain angle. In this case, the thickness of the colored optical glass, through which the radiation passes, is greater than with a normal incidence on the optical filter. The total effective increase in the optical thickness of the light filter is the greater, the more the prismatic element rejects the radiation and the larger portion of the surface of the light filter is covered by a pair of prismatic elements. The second prismatic element 3 deflects radiation in the opposite direction, as a result of which its direction of propagation is parallel to the incident radiation. When radiation is incident on the following combinations (one is shown in the drawing, from prismatic elements 4.5 and light filter 6), the process repeats until the radiation, having passed through the plate from milk glass 7, reaches the receiver 8. The advantage of the proposed device is smoothly adjusting the effective optical thickness of several optical filters independently of each other by mechanically moving pairs of porous elements made, for example, by pressing out of transparent plastic relative to flat filters. This achieves a significant technological simplification of the manufacture of the device and a reduction in labor intensity, since it eliminates the process of grinding and polishing optical wedges. Comparative tests of this device for the subtractive correction of radiation receivers showed that by correcting the spectral sensitivity of the receiver under the curve of the spectral sensitivity of the eye and the function of the spectral sensitivity of a plant, the high accuracy of the selection of these functions is achieved. A device containing prismatic elements of pressed Plexiglas with an angle of 15-20 °, retains a given spectral calibration for a long time and is sure to work. The estimate shows that with the need for devices of 1000 units per year, the economic effect is 64 thousand rubles. Claim 1. A device for subtractive spectral correction of a radiation receiver, consisting of light filters, prismatic transparent elements, milky glass and a radiation receiver, characterized in that, in order to simplify the technology and reduce the complexity of manufacturing the device, prismatic transparent elements form rigidly coupled pairs , between parallel faces of which light filters are placed, while prismatic transparent pairs are arranged to move in the direction perpe Dicticary optical axis. 2. Device pop. 1, characterized in that the prismatic transparent elements are made of non-selective optical material. Sources of information taken into account in the examination 1. E. Vinogradov. On the calculation of the correction light filters for semiconductor elements with a barrier layer, - Svetotekhnika, 1973, No. 5, p. 18. 2. Chernousov PI. Light measurements. M., MEI, 1955, p. 47 (prototype).