Laser rangefinder of relatively eye-safe wavelength range
heading:
| Dzyubenko, MI, Kolenov, IV, Pelipenko, VP, Dakhov, NF, Degtyarev, AV |
Organization: O.Ya. Usikov Institute for Radiophysics and Electronics of NASU V.N. Karazin Kharkiv National University Kharkiv National University of Radio Electronics E-mail: mid41@ukr.net |
| https://doi.org/10.15407/rej2021.01.041 |
| Language: ukranian |
Abstract: Subject and Purpose. The development and prototype making of a laser rangefinder operating in the 1.50…1.70 μm spectral region is reported. This wavelength region is attractive to both laser producers and laser users for, first of all, relative eye-safety of radiation. Methods and Methodology. The paraxial scheme of rangefinder construction is used, involving a software-controlled power supply of laser radiation with technical arrangements providing its adaptation to varying operating conditions. The alignment of the transceiver channels is provided with laser beam visualization methods. Results. A pulsed laser rangefinder operating at a 1.54 μm wavelength has been developed, a prototype has been made. The rangefinder essentially consists of the transmitting and receiving channels and the visual channel for targeting. The radiation source is a pulsed laser on ytterbium-erbium glass with semiconductor diode pumping and modulated Q-factor. The laser provides a 6 mJ power pulse of 25 ns duration and 5 mrad radiation divergence. A laser light spot of a required aperture is formed using a Galilean telescope system. For the photodetector of the reflected radiation, a pin-photodiode with a photosensitive area diagonal of 0.3 mm and a 2.5 ns time resolution is used. The echo signal processing module has been developed and performed, providing a high-precision registration of a time delay between the starting and reflected pulses. An effective method with the use of a charge-coupled device and an LCD monitor has been proposed and implemented for the alignment of all the three rangefinder channels. The rangefinder can operate in a single-pulse or repetitive-pulse mode with a probing pulse repetition rate of 1 Hz. Conclusion. A pulsed laser rangefinder operating in a relatively eye-safe spectrum region has been developed, a prototype has been made. The field tests have shown that the created rangefinder measures an object distance within 140…7 000 m with a measurement error no worse than 3 m. |
| Keywords: channel alignment, diode pumping, imaging channel, transceiver channels, ytterbium-erbium laser |
Manuscript submitted 11.06.2020
Radiofiz. elektron. 2021, 26(1): 41-48
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