METHOD FOR IDENTIFYING OBJECT IN COHERENT LIGHT Russian patent published in 2017 - IPC G01B11/25 G02B27/30 

FIELD: physics.

SUBSTANCE: method includes forming the first and second light beams with wavelengths λ₁ and λ₂ using the first and second collimators, the optical axes of which form an angle of 90°. A mirror is mounted, provided with an opening with a clear aperture ∅₀ at its center and a reflective layer facing away from the first collimator, behind the first collimator at an angle to its optical axis, with the possibility of a light beam with a wavelength λ₁ passing through a mirror hole. The optical axis of the second collimator is directed through the geometric center of the mirror with the opening. The clear aperture ∅_P of the second collimator is selected equal to 1.5∅₀ of the mirror opening diameter. Starting from the intersection point of the optical axes of the first and second collimators, their optical axes are combined and unidirectional recognition of the object in coherent light beams with wavelengths λ₁ and λ₂ is carried out.

EFFECT: possibility of unidirectional recognition of the object in coherent light beams with two different wavelengths.

3 cl, 2 dwg