FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring equipment, in particular, to control the composition of the air and can be used as part of environmental and meteorological monitoring systems. A method for monitoring changes in the composition of the air environment is proposed, in which the gaseous environment is monitored in remote areas of the space for the placement of measuring units, including radio wave propagation channels, which are sources of obtaining the required information. The operation of all pairs of measuring units is synchronized via the VHF communication channel and the local data are combined into a common monitoring system by supplying control signals in the form of modulating sub-tone frequency oscillations. The signal is emitted on the controlled path and received in the repeater unit, where in the controlled phase shifter, synchronized with the reference generator, the signal is transformed in frequency and emitted in the direction of the measuring station. As a result of homodyne frequency conversion of the original and secondary received signals, a low-frequency signal is obtained, which is converted into a signal proportional to the phase incursion of the signal corresponding to the change in the composition of the air medium using a phase detector synchronized with the reference generator. The signal is fed to the deciding unit, where signals proportional to changes in humidity and air temperature are also fed. In the decision block, the meteorological component of the medium under study is subtracted from the signal from the output of the phase detector. At the output of the decisive unit, a signal is received, proportional exclusively to the change in the content of gases in the air, which have a harmful effect on living organisms. The received signal is fed to the processing unit, if the frequency of the subtone signal coincides with the tuned frequency of the measuring station, then the signal containing information about the change in the composition of the air in the investigated area is transmitted to the control unit.
EFFECT: invention is aimed at ensuring the protection of sensors from dust, moisture, vapors, short time for establishing readings and the ability to monitor changes in the composition of the air on long routes.
1 cl, 2 dwg
