SU1404909A1 - Ring nephelometer - Google Patents

Abstract

This invention relates to the field of meteorological instrumentation and the measurement of atmospheric transparency. The purpose of the invention is to improve measurement accuracy. The switch of optical signals is made in the form of a plate 4 of a scattering material set by the mechanism, for example, a reciprocating movement in the path of the light beam. A conical light guide 17 is installed in front of the photo receiver on the path of a focused annular lens-prism of a part of the luminous flux scattered by a plate. optically coupled to the input of a conical fiber. 1 il. S

Description

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The invention relates to meteorological instrumentation and can be used to determine the transparency of the atmosphere.

The aim of the invention is to improve the measurement accuracy.

The drawing shows an optical scheme of a nephelometer. The scheme contains a source of light 1, a condenser 2, a mechanism 3 with a plate 4 of transparent light-scattering material and a protective glass 5 placed in a housing

6 light source unit, absorber

7 lights, measuring volume 8, located in the test medium, and mounted in the photometric block 9 light extinguisher 10, annular lens-prism 11, diaphragm 12 with annular holes 13 and 14 and located behind it photodetector 15 with glass of milk installed in front of it 16, as well as a hollow annular conical light guide 17, an optical attenuator 18 with an axial hole, and a measuring device 19 connected to the output of the photodetector.

The device works as follows.

The light from the light source 1 is formed by a capacitor 2 and in the form of a beam of light close to parallel, the protective glass 5 in the housing 6 of the light source unit enters the atmosphere. Part of the luminous flux, scattered at an angle of 9 to the direction of radiation, in the form of a working luminous flux enters the annular lens-prism 11, and after reflection from its reflecting surface through the annular opening 13 of the diaphragm 12 enters the milky glass 16, providing a uniform grid the receiving surface of the photodetector 15 ,,

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When mechanism 3 is triggered, a luiac pattern 4 of transparent light-scattering material is introduced into the light beam, and part of the light flux it scatters in all directions as a reference light flux enters the annular lens prism II, then through the annular opening 14 in the diaphragm 12 - to the annular entrance hollow conical light guide 17, on you

during which in front of the milk glass 16 is installed optical attenuator 18 with an axial hole. The attenuator is made of neutral light filter.

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It is designed to reduce the level of the reference light flux to the required value. From the output of the photodetector 15, electrical signals arrive at the measuring device 19, designed to generate an output voltage, the value of which is proportional to the measured value of the light scattering indicator of the medium being studied and does not depend on the instability of the characteristics of the optical and electrical circuit elements of the device, since they are all with the exception of scattering glass plates, they are common when generating measuring and reference voltages. The component of the measurement error due to the instability of the properties of the plate, which is scattering 1X, can be neglected due to its smallness.

The light extinguisher 10 installed in the path of the light beam serves to extinguish it and prevent the measurement volume and optical elements of the nephelometer from being illuminated. The light absorber 7 is made in the form of an annular black body model and provides the constancy of the background at which the photodetector views the measurement volume for all changes in ambient light level.

The nephelometer can be used in various areas of the national economy where information on the transparency of the atmosphere is required, including on land, water, and especially in transport. - to ensure the safety and regularity of communications.

Formula aji3o6 re shadow

An annular nephelometer containing a sequentially installed light source, a capacitor, an optical signal switcher, an annular lens-prism, a light extinguisher with an annular aperture, a photodetector, and a measuring device that are distinguished by the fact that, in order to measure the accuracy of the optical signal switcher the form of a plate of transparent light scattering material, and before the photo-reception. NIKOM in the direction of propagation focused by an annular lens31404909

using a prism of the light flux, scattered light, a second annular ejection was made; a hollow conic is installed, optically conjugated with the input light guide, while in the extinguisher there is a house of a hollow conical light guide.

Claims (1)

Claim An annular nephelometer containing a sequentially installed light source, a capacitor, an optical signal switcher, an annular prism lens, a ring-shaped dampener, a photodetector and a measuring device, characterized in that, in order to increase the accuracy of measurements, the optical signal commutator is made in the form of a plate made of transparent light-scattering material, and in front of the photodetector, in the direction of propagation of the focused light ring lens 3 prism of the light flux scattered by the plate, Credited hollow tapered light pipe, the light absorber in the second annular opening formed is optically conjugate with the entrance of the conical hollow fiber.