LASER RANGEFINDER WITH OPTICAL RADIATION TOTALIZER Russian patent published in 2017 - IPC G01C3/08 

FIELD: measuring equipment.

SUBSTANCE: laser rangefinder with the radiation totalizer contains a receiver and a transmitter including an objective and two emitters in the form of semiconductor laser diodes, the output radiation beams of which are polarized and combined with an optical totalizer. Herewith the optical totalizer is made in the form of a birefringent plane-parallel plate, the radiating laser diode arrays are fixed to the case of the rangefinder together with the objective and birefringent plate from one of its faces at a distance between the radiating areas associated with the thickness h of the birefringent plate by the ratio h=a/tgβ, where β - the refraction angle of the unusual beam, a plane base is fixed perpendicular to the optical axis of the objective, on which the laser diodes are fixed, and a plane-parallel compensation plate of thickness 0<g<n_cA is introduced in front of the laser diode corresponding to the unusual beam, where n_c - the refraction index of the compensation plate, A_o - the astigmatism of the optical system. The focal length f of the lens corresponds to the condition f>g_max/ψ, where g_max - the maximum dimension of the radiating area, ψ - the given maximum divergence of radiation from the first and the second radiating areas in their maximum dimensions. The position of the optical system with respect to the images of the emitting areas corresponds to the conditions A - ϕ₂f²/D₀<Δf<ϕ₁f²/D₀, where ϕ₁ and ϕ₂ - the given maximum divergence of radiation from the first and the second radiating areas in their minimum dimensions, Δf - the focus shift of the optical system relative to the image of the radiating area nearest to the lens, A=A_o-A* - the residual astigmatism of the optical system; A* - the displacement of the optical system focal plane due to the compensation plate.

EFFECT: effective using the total energy of probing radiation, when measuring long distances to targets with small angular dimensions.

3 cl, 3 dwg