SU82590A1 - Photoelectric Floor Rimeter - Google Patents

Description

Photovoltaic fields with rotatables 1 with polarizers are known, but they have the disadvantage that when working with them, their eyesight quickly deteriorates, and therefore the accuracy of the instrument readings decreases.

The onable photoelectric field with a rotating polarizer differs from the known ones. In order to improve measurement accuracy, a flat-parallel plate made of Iceland rock cut out parallel to the optical axis is stanched in front of the wrap1, a polarizer cut parallel to the optical axis; light settings.

The drawing shows a photoelectric field.

The source / monochromatic light (mercury, natro or amalgam lamia, monochrometer, lamp with light filter, etc.), located in the focus (or slightly closer to it) of lens 2, gives a parallel or weakly converging beam of light. This beam of light, passing through the polarizer 3, as which the polaroid is applied, passes through the cuvette 4 with the sugar solution, then through the plane-parallel plate of Iceland shpat 5, cut parallel to the ontic axis, strengthened in the reference limb. After the optical axis, the light passes through the rotating polarizer 6 and through the frosted glass 7 hits the photocell 8 associated with the cathode oscilloscope 9. If the optical axis is rotated so that its main directions form an angle of 45 ° with the plane of polarization of the incident light, then The optical axis light will emerge naturally and the rotating polarizer will not react to it. When the concentration changes, the angle of rotation of the polarization plane changes and this plane does not form a 45 ° angle with the main directions of the optical axis. Thus, the light after passing through the optical axis will be partially polarized.

When the polarizer rotates, the light intensity will in general be modulated in time and the photocell will produce a variable current component. In this case, the oscilloscope beam will oscillate. With a corresponding angle of rotation, when the polarization plane forms at 1 4545 °, the beam oscillates stops and at this moment the reading is made. Instead of the optical axis, the polarizer can also be rotated.

Various photocells, photoelectron amplifiers, lead-sulfur photoresistance, etc. can be used in the scheme. Measuring MO kHo in near ultraviolet and infrared rays, in addition,

The proposed device is easily automated. An appropriate solution can continuously flow through the cuvette. The photocell must be connected to relays, which will automatically set the optical axis on the Mippmum modulation. L. Nimbus must be associated with a self-pen that writes but | azapi on paper.

In this case, the stability of the light source and amplifiers is not required, since the work takes place on the variable component of the photocurrent. Record readings give 3iia4ein-; e concentration at any time vrsmey -.

Prevention Invention

A photoelectric field with a rotating polarizer polarizer; that, with iicai io increasing the accuracy of measurements, a flat-parallel plate ii3 of industrial feldspar, cut parallel to the optical axis, was installed in front of the growing polarizer.

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