SU138391A1 - Photoelectric device - Google Patents

Description

Existing photovoltaic devices, which serve to compare the magnitudes of the two modulated light fluxes, are of low accuracy and bulky design.

The proposed photovoltaic device with two photocells increases the accuracy of operation when the measuring element is remote from the medium under investigation by using a mixing resistance, which receives photoelectric signals from both photoelectric cells, and a potentiometer that provides photometric equilibrium by adjusting the voltage of the main harmonic on the mixing resistance to zero.

The described photovoltaic device can be used to measure the transmittance of light by water and the atmosphere, as well as to measure the absorption and reflection of light by the water column.

FIG. 1 shows a diagram of the proposed photoelectric device when measuring the transmittance of light by water.

Incandescent light / sends into the water in the direction of the photocell 2 a parallel beam of light, which is formed by a system of lenses with the 3rd aperture 5. The second beam of light sends a lamp / in the direction of the mirror 6, which reflects it to the photocell 7. Both beams of light are modulated by a disk 8, driven by a direct current motor 9 with a centrifugal speed regulator. A mechanical demodulator 10 is mounted on the axis of the engine 9. The phase is adjusted by turning the photocell 7 with the mirror 6 around the axis of the engine. The field of view of the photocell 2 is determined by a lens // and a diaphragm 12. The signals from the photocells 2 and 7 are output with a shielded hermetic cable from the submerged part of the device and are fed to the output circuits of the narrowband electronic amplifier, where the signal from the photocell 7 is automatically attenuated by measuring potentiometer at a given number of times.

FIG. 2 is a schematic of a device for measuring the absorption coefficient of light by water. .

ib 138391-2 -

The lamp 13 sends a wide diverging beam of light into the water, which is picked up by a photocell 14, which can be moved along the uchka sung. The photo cell 14 is closed with a milky glass and reacts to the serpentine of its light. The second beam of light from the same source of oscillations in the direction of the photocell 15, placed in the box 16.) The beam is modulated by a cylindrical modulator 17, located on the axis of the DC motor. To adjust the phase, the possibility of rotating the photocell 15 around the axis of the motor was re-viewed.

The signals from the photocells are fed to the input circuits of the mentioned amplifier via a shielded, sealed cable, where the X equation occurs. At the same time, the signal from one of the photocells is attenuated by the touch gauge. The measurement consists in obtaining readings on the potentiometer at two different predetermined distances x x, which are fixed by the stops 18 along the rails 19. The device allows the measurement of the coefficient of light absorption by water at any time: duck, regardless of natural light.

FIG. 3 given the electrical circuit of the device. The described photovoltaic device with two photocells .1I is designed to compare the magnitudes of the two light fluxes. The computed light fluxes F and F are modulated by vacuum phototelevteHTBMH 20 and 21. The signal from the first photocell is reproduced by an effective repeater 22 on the measuring potentiometer 23, part of which corresponds to the position of the slider 24 of the potentiometer 23, by: blunt to the left grid 25 of the triode 26. On the right grid 27 of triode 26 by: the signal from the photocell 21 blunts. At the mixing resistance 28, currents from both signals are superimposed.

The main harmonic of the resulting signal arising on resistance 28 is amplified by narrowband amplifier 29 and rectifier; the mechanical or electrical demodulator 30. The voltage r of the demodulator through the power amplifier (not shown) feeds the DC motor 31, which moves the slider 24 of the measuring potentiometer 23 until the photometric equilibrium occurs on the mixing resistance 28. At the same time, the memory motor moves the recorder's pen to register the measured values (not shown in the diagram n)

Subject invention

A photovoltaic device with two photocells for comparing the magnitudes of two modulated light fluxes that pass through the medium under investigation, characterized in that, in order to obtain high accuracy of operation at the remote location of the measuring element of the device from the medium under study, it is made using a mixing resistance that receives photoelectric signals from both photovoltaic cells, and a potentiometer that zeroes on the mixing resistance, photometric equilibrium.

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