Гетеродинный светодальномер

Abstract

In this paper, we consider the possibilities and ways to improve the accuracy of linear measurements and reduce modulation power, as well as their implementation in the construction of a new high-precision laser rangefinder. To do this, it is necessary to implement the transition to a new method of the modulation method that occurs when the operating point of the light modem goes over to the average linear portion of the modulation characteristic of light (MHS). In this case, the dependence of the amplitude-modulated reception light on the distance is characterized by a first-order Bessel function J1 (x) instead of J0 (x), which takes place at the compensation method of the extremum. In addition, such a transition leads not only to a decrease in modulation power, but also to nonlinear distortions and spreads of the modulation phase. All this leads to the fact that there is an increase in the accuracy of linear measurements by almost an order of magnitude. The phase error m? of linear measurements is estimated at hundredths of a millimeter, 0,015–0,02 mm. However, for the implementation of this method, there are difficulties associated with the process of phase detection of the receiving modulated light. There are no photoelectric multipliers operating at a frequency of 600–1200 MHz. The proposed work provides a schematic diagram of the heterodyne laser range finder, which makes it possible to realize the operation of a light-range meter with circular polarization of light by using an auxiliary generator-heterodyne.