SU1693468A1 - Device for measuring dimensions and concentration of microparticles in liquids and gases - Google Patents

Abstract

The invention relates to the field of instrumentation technology and can be used to control the quality of liquid and gaseous process media in the electronic, chemical, medical, pharmaceutical and other sectors of the industry. The purpose of the invention is to increase the resolution, sensitivity and accuracy of measurement by reducing the level of light scattering on structural elements, increasing the angle of collection of the radiation scattered on microparticles and collecting radiation in the most energetically favorable range of angles. The device contains a working volume bounded by a concave reflecting surface of a hemispherical shape and a base plane on which a photodetector and an input window through which the laminar flow of the medium under study is located at the same diameter and at the same distance from the center of the hemisphere. A semiconductor radiator, a micro-lens, a separator plate and a light-absorbing trap are located in the working volume. An outlet is located at the center of the concave reflecting hemisphere to lead the medium under investigation. 1 il. (Ls

Description

The invention relates to a control and measuring technique and can be used to control the quality of liquid and gaseous process media in the electronic, chemical, medical, pharmaceutical and other sectors of the industry.

The aim of the invention is to increase the resolution, sensitivity and accuracy of measuring the size and concentration of microparticles in liquids and gases.

The goal is achieved by reducing the level of light scattering on structural elements, increasing the angle of collection of scattered light.

on microparticles of radiation and radiation collection in the most energetically favorable range of angles.

In addition, the device does not contain high-voltage power sources, which makes it possible to use it in conditions of work with fire and explosive technological media, as well as in portable equipment for work in field conditions.

The drawing shows the proposed device

The device contains a working volume 1, bounded by a hemisphere 2 and the base plane 3, on which at the same diameter and at the same distance (no more than half

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fault radius) from the center of the hemisphere 2 are located the photodetector 4 and the input window 5, through which the flow of the investigated medium with controlled particles passes. In working volume 1, a semiconductor emitter 6, a micro-lens 7, a beam-splitting plate 8 and a light-absorbing trap 9 are located on the same axis. For the output and the medium under study, an outlet 10 is located in the center of the concave reflecting hemisphere 2.

The device works as follows.

The radiation of the semiconductor emitter 6 is collected by the micro-lens 7 and at a certain angle falls on the beam-splitting plate 8, the light passing through the beam-splitting plate 8 is absorbed by the trap 9, and reflected from the plate falls on the concave reflecting surface of the hemisphere 2, and then focused on the input a window 5, where, after the medium being injected, monitored particles slip through, and thus a counting volume is created at the inlet window 5. The light scattered on the microparticles below 90 ° to 180 ° falls on the hemisphere 2 and focuses on the photodetector 4, which is optically aligned with the image of the semiconductor emitter 6 and located under the beam-splitting plate 8. The required image size is determined by adjusting the relative position of the base plane 3 and

hemisphere 2. From the photodetector 4, the signal is removed by a recording device. Light not scattered at angles less than 90 ° passes through the entrance window 5 and is absorbed in the channel 11 of the base. The investigated medium through the opening 10 is brought out of the working volume 1.

Claims (1)

Invention Formula A device for measuring the size and concentration of microparticles in liquids of gases, containing a radiation source, a concave reflecting surface of a hemispherical shape, limiting the working volume, and a photodetector, characterized in that, in order to increase the sensitivity, resolution and accuracy of measurements, the radiation source and the photodetector is located inside the working volume, the radiation source is made in the form of a semiconductor radiator, the device additionally contains a micro lens and a beam-splitting plate, located between the semiconductor emitter and the concave reflecting surface of a hemispherical shape, and an optical trap behind the beam splitter plate along the semiconductor emitter beams, an optical receiver combined with the image of the semiconductor radiation source and located under the beam splitter plate.