SU1679337A1 - Hygrometer - Google Patents

Abstract

This invention relates to hygrometry and can be used to measure low dew points of gases. The purpose of the invention is to improve the accuracy of measuring the dew point of a gas. The hygrometer contains a measuring chamber, the internal cavity of which is made in the form of a regular multifaceted prism, whose faces are condensation mirrors, a cooler, a light source, a photodetector. In the measuring chamber there are channels for entry and exit of light rays, directed at an angle to the edges and axis of the measurement chamber with the possibility of forming a helical path of light rays, 2 sludge.

Description

The invention relates to hygrometry, primarily for measuring low gas dew points.

FIG. 1 shows a hygrometer; in fig. 2 shows section A-A in FIG. one.

The hygrometer includes a measuring chamber 1, the internal cavity of which is made in the form of a regular multifaceted prism with mirrored edges, for example, a hexagonal, at least one of the faces is a condensation mirror 2, and a cooler 3, for example, a thermopile. A light source 4, such as a light bulb and a photodetector 5. such as a photocell, is installed in channels 6 and 7, respectively, for the entrance and exit of the light flux and covered with protective glasses. In this case, the channels 6 and 7 for the entrance and exit of the light flux are directed at an angle to the edges and axis of the measuring chamber and are the beginning and the end of the helical trajectory of the light flux passing through the internal cavity of the measuring chamber (instrumentation - temperature sensors, pressure and gas consumption not shown)

To measure the gas dew point, the analyzed gas with the required flow rate, for example 1 l / min, is passed through the measuring chamber 1, which is cooled with the help of cooler 3. At the same time, light source 4 is switched on and light rays through channel 6 are directed to facets of a multifaceted prism that are measuring mirrors 2. The angle between the direction of the light beam and the face of the prism (measuring mirror) is chosen so that the light beam reflected from this face falls on the middle of an adjacent face, for example 30 °. The angle between the direction of the light beam and the axis of the prism is chosen so that the light rays form a helical image.

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The trajectory was practically contiguous, for example, 5 °.

Reflecting repeatedly from the surface of a regular multifaceted prism along a helical path, the light rays through channel 7 to exit the light rays enter the photodetector 5,

When a condensed phase of water vapor forms at any place of the measuring mirrors 2, the intensity of the light rays entering the photodetector 5 changes significantly. At this moment, the temperature of the measuring chamber 1, which corresponds to the dew point of the gas at a given pressure, is measured.

Claims (1)

Claims of the invention: A hygrometer comprising a measuring chamber, a condensation mirror with a cooler, a light source and a photodetector, characterized in that, in order to improve the measurement accuracy of the gas dew point, the internal cavity of the measuring chamber is made in the form of a regular multifaceted prism with specular edges, At least one of which is a condensation mirror, a light source and a photodetector are respectively installed in the channels for entry and exit of the luminous flux, the axes of which are the beginning and the end of the helical path of the luminous flux passing through the internal cavity of the measuring chamber.