SU82251A1 - Device for comparing the intensity of two light streams - Google Patents

Description

A device for comparing the intensity of the light fluxes is proposed, in which a polarization attenuator with a crossed polarizer and an analyzer is used to modulate the light flux. and for recording the intensity of the luminous flux, a photocell connected through a divider and a thyratron relay to the servo-game chain, moving the photometric wedge and the recorder's pencil.

The described device for comparing the intensity of two light fluxes has the peculiarity that between the polarizer and the analyzer there is a transparent body made of a material with a large constant Verde located in the field of the solenoid fed by the current from the common with the photocurrent amplifier of the network. The thyratron relay of the device is controlled by a photocurrent caused by the occurrence in the last secondary harmonics due to the inequality of the compared flows.

FIG. 1 is a schematic diagram of a device used as a colorimeter; in fig. 2-scheme when using the device as a turbidimeter; in fig. 3 - when used as a photometer.

Two polarizers fli and H2 (fig. 1) are set relative to each other at an angle of 90 °. Between the sexes I | and R2 and analyzer A, installed a transparent body F of a material with a large constant Verde, located in the field of the solenoid C, fed by current from the common with the network photocurrent amplifier. Photocurrent photocell E is amplified by the Y amplifier. At the output of the amplifier, a thyratron relay T (or electronic relay) is turned on, which reacts to the phase supplied from the voltage amplifier.

The reversible servomotor MI and the solenoid C are powered by alternating current. Servomotor Mj, controlled by the thyratron relay G, through the PI reducer drives the worm to the writing device /.

N ° 82251-2 Simultaneously, the MI servomotor acts on the light flux by changing the optical path of atiH eHtie Kz. , is polarized by polarizers I and P and irohod it through the transparent body F, installed in Solenoid C, through the analyzer / 1, lens // 2 and the diaphragm Dz and pad 1 on the photocell E.

The analyzer is set in such a way that, at the same intensity of light notes passing through the wedges Ki and Kz, the light fluxes flowing through the analyzer will be the same. This will be the case if one polarizer is mixed by 45 ° but relative to the analyzer outside, and the second is 45 ° left. When the solenoid is turned on in the AC circuit, the zero-current polarization plane will oscillate with the frequency of the current due to the magneto-optical Farad effect. The resulting luminous flux on the photocell will remain constant, since, however, as the luminous flux increases from the polarizer I; the luminous flux from the polarizer Hg will be reduced to the same extent, due to the fact that both luminous fluxes are shifted in phase and are located on the ir of the lightning part of the characteristic / Cos, where / is the luminous intensity.

When the equilibrium intensities of the light sources flowing through the ontic wedges are disturbed, the equilibrium of the light fluxes passing through the analyzer from the polarizers I) n P.

The phases of the current will be in direct proportion to which of the wedges KI or K2, the intensity has decreased or increased. At the output of the amplifier, a thyratron relay T is turned on, which drives the reversing servo motor UM |, which drives the optical wedge K2, which again restores the equilibrium of the light fluxes.

Servomotor M sdnovremeino with optical k.chinom drives the writing device, which draws a curve representing the movement of the wedge K.2, and therefore, will record the change in light flux through the optical wedge / d, i.e. the color intensity.

The second engine Mg rotates the drum B of a writing device through the reducer P2.

When using the proposed device, a nephelometric optical system consisting of two wedges / Ci and AV (Fig. 2) illuminated from the side is installed as a turbidimeter instead of a colorimetric system, while compensation can be produced by a neutral optical wedge or aperture size D.

When using the device for photometry, photometric optical cncteMa is used (Fig. 3), where 3-screens or mirrors, Lz and L-lenses, through which the light fluxes are designed - one from the standard light source and the second from the measured one. In this case, the servomotor MI acts on the luminous flux of a standard light source by changing the diaphragm D or changing the intensity of the light flux by moving them towards the mirror 3 (Fig. 3) or by a neutral optical wedge.

In a similar way, it is possible to measure the temperature of the light of a body by the law of displacement, by comparing the intensity of two light fluxes of a heated body through light filters.

Subject invention

A device for comparing the intensity of two light fluxes with the use of a polarizer and analyzer for modulating the light polarization attenuator, and for recording the intensity of the light flux of a photocell connected through an amplifier and a thyratron relay to the servo motor, unshifted, its optical wedge and pencil of the recorder, characterized in that between the polarizer and the analyzer there is a transparent body made of a material with a large constant Verde, located in the field of a solenoid fed by a current of t in common with the photocurrent amplifier of the network, in order to control the thyratron relay current, caused by the appearance in the latter of secondary harmonics, due to the inequality of the compared light fluxes.

.No 82251

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