Abstract
Performing high-precision linear measurements is one of the main tasks of modern engineering geodesy. Consequently, the development and creation of high-precision laser rangefinders and refractometers with a relative measurement error of not more than 3.10-7, becomes an urgent scientific and technical problem. Wide theoretical and experimental studies in the problem laboratory of geodetic measurements of NUACA have accumulated a sufficient amount of experimental results for the construction of modern high-precision light meter with the determination of the residual part of the phase cycle with an error of 0.03-0.05 mm. The article discusses issues related to improving the accuracy of linear measurements developed in the NUACA of high-precision light rangefinder. A two-phase modulation measurement method is proposed, when signals shifted by 180° are formed optically using a phase plate at λ/2. This modulation method of linear measurements provided the phase error of linear measurements mφ = 0.03-0.05 mm. The article also discusses the issue of reducing the modulation power. For this purpose, it is proposed to install a high-quality buffer Q-resonator between the high-quality light modem and the low-quality microwave oscillator.
Highlights
At the present stage more and more increased requirements for precision geodetic work for such special objects as Comparators, the baseline on the faults of tectonic plates, large space antennas, charged particle accelerators, etc
In foreign high-precision light rangefinders on the compensation method of the light electro-optical modulation, increase of the measurement precision is implemented by rehandling of the minimum demodulated light by small deviation of the modulation frequency taking place in Mekometer ME-3000 and Geomancer GR-204 [1] on the
MHz are compared with a 2-fold decrease in modulation power, i.e. at the same modulation power, and it is seen that the sensitivity at 1200 MHz is greater than 600 MHz, i.e., at the same ODL displacements, the signal reduction is 1.25 times less by 600 MHz
Summary
At the present stage more and more increased requirements for precision geodetic work for such special objects as Comparators, the baseline on the faults of tectonic plates, large space antennas, charged particle accelerators, etc. The use of the specified range-finders on various linear measurements showed the feasibility of introducing them into the work of building national geodetic networks “0” — classis for performing measurements on the base lines with an error ms = (0.1 + 2 10-7S) mm [2]. In the Russian Federation, the ME-5000 optical rangefinder [4] was used to study the deformation on the Sami Fault (Khibiny)
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