SU1435953A1 - Photometer - Google Patents

Abstract

The invention can be used in biological, medical. food and other industrial fields to measure the concentration of microbiological media. The goal is to improve the measurement accuracy of the device. The device has an optical sensor 7 containing a fiber light guide 5, photometric integrating spheres 8 and 10, in the case of each of which focusing systems 11 and 12 are installed, and in their focus are the separate ends of a two-collector collector 13. This allows concentration of microbiological media by determining the amount of absorption of light by them. 1 il. .

Description

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The invention relates to analytical devices, namely, photometric analyzers of microbiological media, and can be used in biological, medical, food and other industries, as well as in the system of environmental protection.

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

The drawing shows the block diagram of the photometer.

The photometer consists of a source of radiation I, the first optical system 2, and the first photodetector 3, forming a comparative channel.

The measuring channel contains successively located optical system 4, optical fiber 5 with lens 6 on the lens, optical sensor 7, first integrating sphere 8, cuvette 9, second integrating sphere 10, focusing systems 11 and 12 with a large aperture, two-high collector 13, measuring photodetector 14.

The photodetectors 3 and 14 are connected to the inputs of the subtracting device 15, the output of which is connected to the input of the measuring device 16.

Power supply unit 17 is connected to all energy-consuming nodes;

The photometer works as follows.

The radiation from the source 1 falls on the optical system 2, and from there on the photodetector 3 and is registered by the subtractor 15.

At the same time, the optical systems 2 focuses the radiation of the source 1 into the optical fiber 5. Due to the multiple reflection of radiation in the optical fiber, radiation with uniform distribution of intensity is obtained at the output. This and the Glie beam are collineated by the lens 6 and, having passed through the integrating sphere -8 and. the cuvette 9 with the medium under study, enters the integrating sphere 10. The focusing systems 11 and 12 with a large aperture make it possible to maximally collect the reflected and scattered parts of the analyzed medium and the inner walls of the radiation spheres and direct it to the separate ends of a two-way water collector 13. Prototal radiation enters the photodetector 14, and from there to the subtracting device 15.

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The signal obtained at the output of the subtractor 15 characterizes the amount of absorption of light by the medium under study. It is recorded and processed by the measuring

device 16.

Thus, in a photometer, an osmosis is the direct measurement of the amount of absorption of light by the medium under investigation by optical summation of the reflected and scattered radiation.

Claims (1)

The measurement error in the proposed technical solution is halved. Thanks to this design, the reliability of the photometer is increased by one and a half times. Formula of the invention A photometer containing a radiation source with a power supply unit, a comparative optical channel comprising a first optical system and a first photodetector arranged in series along the radiation path, a measuring optical channel including a second optical system arranged in series along the course of the radiation, an optical sensor with a cuvette and a second photodetector, and also a subtractive device connected in series, with the first and second photodetectors connected to the inputs, and a measuring device, the subtractive and The measuring device is connected to a power supply unit, characterized in that, in order to improve the measurement accuracy, a fiber light guide and a two-light collector collector are implanted in it, and the optical sensor is made in the form of first and second integrating spheres with a cuvette between them, One end of the fiber is located at the output of the second optical system, and the other is located in one window of the first integrating sphere on the main optical axis passing through the centers of the spheres, and in the output windows of the first and second integrating sphere p arranged first and second shirokoaper--temperature system, respectively, are installed at the foci isolated ends dvuhsvetovodnogo collector optical axis which passes through the center of the sphere perpendicular to the main optical axis and a common end of the collector is optically coupled to a second - a photodetector.