A. A. Tikhomirov

Analyzing natural gas by spontaneous Raman scattering spectroscopy

The use of multipass optical systems as well as the compression of the gaseous test medium to increase the signal intensity of the spontaneous Raman scattering of light has been experimentally studied. A description of a prototype developed for a natural-gas analyzer based on spontaneous Raman scattering spectroscopy is presented. A technique is described for calculating the composition of natural gas from its spectrum. The results are compared with chromatographic-analysis data.

Raman gas-analyzer for analyzing environmental and technogenic gas media

The improvement of the sensitivity of the Raman gas-analyzer using a multireflection optical system and gas media compression has been studied. It was shown that both methods have a high efficiency. However, when gas is compressed, one must take into account the variations in position and form of Q branches for molecular vibrational bands and the variations in their differential cross sections. Methods for further improving the Raman gas analyzer sensitivity are given.

Determination of calibration parameters of an optoelectronic precipitation gage

The main parameters of optical channels of an optoelectronic dual-channel precipitation gage are described, as well as results of laboratory experiments and preliminary field tests. A procedure is suggested for calculating the calibration parameters using 5.01-mm steel balls; it allows minimizing the error caused by imperfections in the optical system of the device. The results of liquid volume measurements show that the laboratory precipitation measurement error does not exceed 5%. Preliminary results of field measurements are shown in the form of size distributions of precipitation particles, variations in the intensity, and the total precipitation calculated.

Detection of microstructure characteristics of liquid atmospheric precipitation with the optical rain gage

The described optical rain gage is intended for the measurement and analysis of shadow images of precipitation particles. The device operation capabilities are exemplified in the study of the microstructure of liquid atmospheric precipitation that fell in Tomsk on August 26–27, 2014.

A field version of the AMK-03 automated ultrasonic meteorological complex

In this paper, a new field version of the automated ultrasonic meteorological complex AMK-03 is described. This complex is intended for measuring instant values of the main meteorological variables, such as air temperature, horizontal and vertical components of the wind speed and direction, relative humidity, and atmospheric pressure. These data are obtained and processed with 40 Hz sensors and then accumulated in a logger. In this complex, data acquisition via eight extra sensors (including soil and/or water temperature sensors) is foreseen. The data are recorded onto changeable flash cards (whose capacity is at least 256 Mb). To the logger data decoding and processing, special software is developed. The complex is supplied with batteries that provide its autonomic operation for at least 96 hours. Together with its transportation case, its weight does not exceed 19 kg. The AMK-03 complex has been registered in the State Register of the Measuring Instruments of Russia.

Metrological support of ultrasonic thermoanemometers for measurement of pulsation properties of meteorological parameters

Metrological support of production and exploitation of ultrasonic thermoanemometers (anemometers/thermometers) (UTA) for measurement of meteorological parameters of the atmospheric boundary layer is considered in this work. Necessary UTA tests are described: in an wind tunnel, zero wind chamber, climatic chamber, and in a pressure chamber. Parameters of the ADS-60 wind tunnel, which has been designed at Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch, Russian Academy of Sciences, are given. ADS-60 was designed for testing UTA against rules of Russian Federal Service for Hydrometeorology and Environmental Monitoring for wind velocity. A mobile complex designed for checking technical parameters of UTA in field conditions is described.

Multilevel ultrasonic complexes for monitoring of meteorological and turbulent parameters in the ground atmosphere

The multilevel ultrasonic complexes created in IMCES SB RAS for automatic monitoring of meteorological and turbulent parameters in the ground atmosphere are described in this article. The results of measurements which demonstrate their opportunities for scientific research of the atmosphere are given in this article as well.

Some results of operation of the spatially distributed measuring meteorological system based on the network of ultrasonic automatic weather stations

Described is the measuring meteorological system consisting of four AMK-03 automatic weather stations located at the distance of several tens of kilometers from each other in the vicinity of Tomsk; controllers for transferring meteorological data via Internet; the server for data acquisition; and the special software. Presented are the examples of synchronous measurements of major meteorological parameters at the stations, their correlation analysis for four periods of weekly observations, and functions of spatiotemporal cross-correlation. The system is a prototype for the realization of the technology of mesoscale monitoring of the atmospheric surface layer.

Laser rangefinder monitoring of hydro-technical utility positions (the case of Ust-Kamenogorsk shipping lock)

A laser rangefinder system for monitoring Ust-Kamenogorsk shipping lock’s wall deviations caused by seasonal thermal deformations and dynamic loads related to the lock filling/emptying is described, as well as the results of 8.5-year observations. The Ust-Kamenogorsk shipping lock has a high-head single-lift chamber 47 m in depth. A trend toward a decrease in the chamber width with a rate of ~2.2 mm/year in the upper part of the lock is ascertained. The effect of the chamber filling/emptying on the dynamics of wall deviations is studied.

Correlation features for rows averaged values of meteorological parameters obtained from measurements in regional network of the automated ultrasonic weather stations

Numerical estimates and analysis are presented of correlations within surface layer for averaged (over periods from 1 to 20 minutes) values of meteorological parameters obtained as a result of measurement data processing. The measurement data are acquired form information-measuring system which includes several spatially separated automated ultrasonic weather stations located in Tomsk suburbs.