SU535468A1

SU535468A1 - Photometric installation

Info

Publication number: SU535468A1
Application number: SU2090802A
Authority: SU
Inventors: Виктор Абрамович Каплун; Николай Михайлович Пешков; Александр Павлович Садовой
Original assignee: Предприятие П/Я В-8872
Priority date: 1975-01-03
Filing date: 1975-01-03
Publication date: 1976-11-15

Description

Изобретение относитс к области контрольно-измерительной техники, в частности к устройствам дл непрерывного измерени и регистрации изменени оптической плотности фотохромных материалов.The invention relates to the field of instrumentation technology, in particular, devices for continuously measuring and recording changes in the optical density of photochromic materials.

Известны фотометрические устройства дл контрол кинетических характеристик фотохромных материалов (степени и скорости потемнени , Бремени релаксации), содержащие источник активирующего излучени , оптическую систему формировани светового потока, образец, измерительно-регистрирующее устройство .Photometric devices are known for monitoring the kinetic characteristics of photochromic materials (degree and speed of darkening, relaxation burden), containing a source of activating radiation, an optical system for forming a light flux, a sample, and a measuring and recording device.

В данных устройствах определение кинетических свойств фотохромных материалов осуществл етс методом направлени активирующего излучени под углом по отнощению к контрольному лучу. Источник активирующего излучени выполнен на ртутной лампе, а источником контрольного луча вл етс лампа накаливани , при этом эти источники расположены под углом 45° один относительно другого . В качестве регистрирующего устройства используют серийный спектрофотометр «Бэкмана ДК-2.In these devices, the kinetic properties of photochromic materials are determined by directing the activating radiation at an angle relative to the reference beam. The source of activating radiation is made on a mercury lamp, and the source of the control beam is a glow lamp, while these sources are located at an angle of 45 ° one relative to another. As a recording device using a serial spectrophotometer "Backman DK-2.

Недостатки этих устройств заключаютс в том, что угловой метод засветки не вл етс достаточно эффективным, так как в процессе активации рассе нный образцом свет активирующего источника попадает в измерительный канал. При этом уровень шумов становитс соизмеримым с полезным сигналом.The disadvantages of these devices are that the angular method of illumination is not sufficiently effective, since in the process of activation, the light scattered by the sample of the activating source enters the measuring channel. Thus, the noise level becomes commensurate with the useful signal.

Наиболее близкой по технической сущности к предлагаемому устройству вл етс фотометрическа установка, содержаща источник активирующего излучени , оптическую систему формировани светового потока, образец, измерительно-регистрирующее устройство. Осветитель, играющий роль активатора, выполней на ртутной лампе и расположен под углом 45° к контрольному лучу, источником которого вл етс лампа накаливани . В качестве регистрирующего устройства применен селеновый фотоэлемент и электронный потенциометр ЭПП-09. В этой схеме применена двулучева система.The closest in technical essence to the proposed device is a photometric installation comprising a source of activating radiation, an optical system for forming a light flux, a sample, a measuring and recording device. The illuminator, which plays the role of an activator, is made on a mercury lamp and is located at an angle of 45 ° to the reference beam, the source of which is the incandescent lamp. A selenium photocell and an electronic potentiometer EPP-09 were used as a recording device. In this scheme, a two-beam system is applied.

Недостатком такого устройства вл етс то, что эффективность контрол недостаточна , так как светорассе нное излучение активированного источника попадает в измерительный канал и кроме этого результат измерени , полученный на таких установках, не отвечает услови м эксплуатации фотохромных материалов , так как в услови х эксплуатации фотохромпый материал облучаетс от одного источника .The disadvantage of such a device is that the monitoring efficiency is insufficient, since the light scattering radiation of the activated source enters the measuring channel and, moreover, the measurement result obtained on such installations does not meet the conditions of use of photochromic materials, since under the conditions of operation photochromic material irradiated from a single source.

Цель изобретени - повышение эффективности контрол фотохромных материалов. Это достигаетс тем, что в предлагаемуюThe purpose of the invention is to increase the efficiency of control of photochromic materials. This is achieved in that the proposed

Claims

The installation includes at least two identical attenuators, equipped with means for alternately introducing them into the light notes, one in front of the sample, and the other for them. i The drawing shows the scheme of the proposed device. The operation of the photometric installation is based on the continuous measurement of the variable transmittance during and after the action of the illumination source on the test sample. The radiation from the light source 1, formed by the diaphragm 2 and the condenser 3, passes through the beam-splitting device 4, enters the test sample 5 and through the filter-attenuator 6 to the photocell 7. The filter-attenuator 6 in this case plays the role of protection of the photocell against overload. Under the action of activating radiation, the test sample is stained, therefore, its transmission decreases and after some time of this action reaches its minimum values. The recording device 8 depicts on the chart tape the process that occurred in the sample during this time. After that, a filter-attenuator 9, identical in density and spectral characteristic to the filter 6, is introduced into the measuring channel in front of the sample. The input of the filter 9 into the light nook is synchronized with the output of filter 6. At the same time, the effect of illumination on the sample stops. The discoloration process begins, and after some time the sample transmission reaches its maximum value. In the process of bleaching, the light filter 9 absorbs the same part of the light flux as the light filter 6 in the darkening process. This ensures the same operating conditions of the receiving device (photocell) 7 during the whole process. Now, the recording device 8 depicts on the chart tape the process that occurred in the sample after the exposure to it has been exposed to light. A part of the radiation flux is branched off by a beam-splitting device 4, which is a plane-parallel quartz plate, and falls onto the photocell 10 and into a current amplifier 11, which converts the luminous flux into a proportional electrical signal. A change in the working flux of the lamp leads to a change in the flux on the photocell 10 and, consequently, to a change in the signal at the output of the current amplifier 11. The latter changes the electrical mode of operation of the lamp in such a way as to return the working flux of radiation to its nominal value. This ensures the stabilization of the initial light flux. The invention of a photometric installation containing a radiation activating source, an optical system for forming a light flux, a sample, a measuring-recording device, characterized in that, in order to improve the efficiency of controlling fluorine materials, two identical attenuators have been introduced into it, provided with means for alternately introducing their luminous flux, one before the sample, the other behind it.

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