The laser generation wavelengths were calibrated by experimental measurement of the transmission spectra of the gas mixture in the cell. The program for automatic formation of the tuning curve of a laser with parametric generation of light and the program for automatic measurement of the dependence of the pulse energy on the generation wavelength were developed. Using the developed programs, a number of experiments were carried out to measure the efficiency of laser radiation generation, based on the results of automatically generated tuning curves. The control program for the spectrograph for recording lidar signals with its use were developed, and a test recording of the emission spectrum of a laser diode were carried out.
Within the RSF project 21-79-10051, we created and put into the operation the mobile lidar for monitoring of tropospheric ozone at the sensing wavelengths of 299/341 nm. A technical description of the mobile lidar system is presented. The measurements of tropospheric ozone are carried out in the altitude range from 0.1 to 12 km. First ozone profiles, retrieved in 2022 and 2023, are presented.
Lidar returns of a mobile three-channel IR lidar system which is currently designed are simulated in the spectral ranges informative for sounding greenhouse gases (CH4, CO2, and H2O) along horizontal and slant tropospheric paths. The configuration of the lidar system is described.
The results of the calculation of atmospheric transmission spectra and modeling of lidar signals in the informative range of greenhouse gases sounding (CO2, H2O) on horizontal tropospheric paths by using a two-channel infrared lidar system under development are presented. It is shown that the spectral range of operation of the lidar system 4878–4894 cm-1 (2043–2050 nm) is preferable for simultaneous probing of CO2 and H2O, in which the level of lidar signals is in the range of 10-6 –10-10 W and exceeds the equivalent noise power photodetector. Several configurations of the lidar system with the generation of nanosecond radiation pulses in the selected informative range of sounding the trace gases under study are proposed.
The results of computer simulation of the overlap function for a biaxial lidar scheme with different diameters of the receiving part photosensitive zone of the optical system are presented. It is shown at what sizes of the photosensitive zone the full overlap of the telescope field of view and the laser beam is ensured sounding path of up to 1 km. The length of the "dead" zone, when the laser beam propagates parallel relative to the optical axis of the telescope is estimated.
A stationary lidar system for atmospheric gas analysis in the spectral ranges of 1800–2120 and 2120–2550 nm has been developed and is being modernized. Variants of the technical design of the near-infrared lidar system are presented. Tuning curves of the lidar radiation source and echo signals on the surface horizontal sounding paths were obtained.
The calibration of a mobile IR laser source of a DIAL system near ~ 3400 nm for the study of methane in the atmosphere has been carried out. The technical characteristics of the IR lidar have been determined. The first test experiments to collect the atmospheric response at the calibrated wavelengths (3428.428 and 3431.708 nm) of methane sounding using a mobile IR OPO laser source were carried out.
The concept of an airborne IR differential absorption lidar for the study of methane in the atmosphere (in particular, in the Russian sector of the Arctic) is presented. The description of the main nodes and elements of the transceiver part of the IR lidar is given. The results of calculation of informative methane sensing wavelengths for polar latitudes are presented.
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