SU1179169A1 - Method of determining phase condition of clouds and aerosol media - Google Patents

Abstract

A method for determining the phase state of clouds and aerosol media, including irradiating the test medium with polarized radiation, receiving and recording the first echo signal, characterized in that, in order to increase the measurement sensitivity and range of measured parameters, the test medium is irradiated with circularly polarized radiation additionally, the second echo signal is received and recorded in the plane orthogonal to the first echo receiving plane, the echo amplitudes are aligned, the polarization is changed The intensity of both echoes (O signals and their ratio, according to which (L judge the phase state of clouds and aerosol media), determine the intensity of the irradiating radiation to a linear one with a polarization plane parallel to one of the reception planes.

Description

CD

Od sb

I

The invention relates to the study of cloud environments by optical methods and can be used in meteorology, as well as in industry for determining the phase and shape of particles suspended in a gas or liquid.

Phase state is an important characteristic of cloud systems that meteorologists need to know for weather forecasting and for developing optimal methods for influencing cloud cover, as well as for determining the result of exposure to clouds of various crystallizing agents.

The aim of the invention is to increase the sensitivity of measurements and the range of measured parameters.

The method is carried out as follows.

A beam of linearly polarized radiation is directed to the test medium (cloud, fog). Two receivers designed to receive radiation, scattered at an angle close to 180, are installed in two orthogonal planes, one of which coincides with the plane of polarization of the incident radiation. With the help of a circular polarizer, radiation with linear polarization is transformed into radiation with circular polarization and the equality of the amplitudes of the echo signals registered by both receivers is established by a scale converter or light filters. After that, the test medium is irradiated with linearly polarized radiation and the signal ratio is determined

D. / For l about the receiver installed in the plane of oscillations of the vector). By this magnitude, this ratio is judged by the phase state.

791692

clouds and the shape of crystalline particles, if the ratio j is then a crystalline phase is present in the cloud. In addition, if Ji / j 5 then the crystalline particles are in the form of columns.

Thus, in the proposed method, the value of the ratio O-i / J j. does not depend on the optical thickness, but

0 is determined only by the shape of the scattering particles, i.e. depends only on the phase state of the cloud, which increases the sensitivity of the method. Since the ratio of the signals depends on the shape of the particles, the proposed method allows remotely distinguishing columnar crystals from particles of another shape, which increases the range of measured parameters.

In the proposed method, unlike the known, the received echo signal is not divided into two components T and. therefore the minimum of the echo amplitudes is approximately

twice as much. In addition, in the proposed method can be applied

receivers with a larger angular aperture

t rounds than in the famous that also

Q increases the power of the received echo. So, with an increase in the angular aperture of the receiver from 5-10 to 20.10, the rad signal power will increase by 16 times. This reduces the measurement errors of the signals.

Thus, the proposed method in comparison with the prototype ob-. It is more sensitive and allows you to distinguish 0 columnar (i.e. elongated) crystals from crystals of another form. It can be used to remotely emit a composition of not only natural clouds, but also artificial aerosol formations.

Claims (1)

METHOD FOR DETERMINING THE PHASE STATE OF CLOUDS AND AEROSOL MEDIA, including irradiating the test medium with polarized radiation, receiving and recording the first echo signal, characterized in that, in order to increase the measurement sensitivity and the range of measured parameters, the test medium is irradiated with circularly polarized radiation, and registration of the second echo in the plane orthogonal to the plane of reception of the first echo, equalize the amplitude of the echo signals, change the polarization of the radiation radiation to a linear one with a plane of polarization parallel to one of the receiving planes, determine the intensities of both echo signals and their ratio, which is used to judge the phase state of clouds and aerosol media.