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

FIELD: measuring equipment.

SUBSTANCE: laser rangemetre with the optical 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 at right angle to each other and combined by the optical totalizer in the form of a birefringent parallel-sided plate. Moreover, laser diodes are installed on the side of its face opposite to the lens, in a plane perpendicular to the optical axis of the lens, the birefringent plate is inclined relative to the line connecting the radiating laser diode areas at and angle γ=γ_n+γ_c, which satisfies condition ⎜X_o(γ)-X_e(γ)⎜≤ΔX_max, where γ_n is a nominal value of the plate inclination angle; γ_c is a constant correction; X_o(γ) and X_e(γ) is the longitudinal position of the foci for the ordinary and extraordinary beam of rays, respectively; ΔX_mac is the maximum allowable distance between the focal planes; Y_o(γ) and Y_e(γ) is the transverse position of the foci for the ordinary and extraordinary beam of rays, respectively; F is a lens focus position on the axis x in the absence of the birefringent plate, wherein X_o(γ)=F+Y_o(γ)/tgγ; X_e(γ)=F+h⋅tgβ/Sinγ+Y_e(γ)/tgγ; Y_o(γ)=h_o*Sin(γ-γ_o*); Y_e(γ)=h_e*Sin(γ-(γ_e*+β)); h_o*=h/Cos(γ_o*); h_e*=h/Cos(γ_e*+β); h is the thickness of the birefringent plate; ; ; n_o and n_e is refractive index of the ordinary and extraordinary beam of rays, respectively, and the distance b between the radiating laser diode areas satisfies the condition; ⎜Y_o(γ)-Y_e(γ)⎜-b=±ΔY_max/2; ΔY_max=Δϕ_maxF; Δϕ_max is the maximum beam width of probing radiation.

EFFECT: exact alignment of foci of ordinary and extraordinary beam of rays.

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