| 摘要 |
The invention relates to an electronic distance measuring apparatus for surveying, e.g. for measuring the distance from the apparatus to an object. The apparatus comprises: a) an objective lens ( 101 ), defining an optical axis (OA), b) at least two sources ( 111, 112 ) of structured light for transmitting beams (lambda<SUB>1</SUB>, lambda<SUB>2</SUB>) of separate wavelengths towards said object, said beams on reflection from said object received by the objective lens ( 101 ), (c) at least two receivers ( 141, 142 ) arranged outside a beam path ( 109 ) as defined by the objective lens ( 101 ), and adapted to receive said received beams (lambda<SUB>1</SUB>, lambda<SUB>2</SUB>) of structured light. Optical means comprising at least two dichroic surfaces ( 121 a, 122 a) are each arranged at a tilt angle (alpha<SUB>1</SUB>, alpha<SUB>2</SUB>) with respect to said axis (OA), said optical axis (OA) passing through said surfaces, at least one of said dichroic surfaces arranged on a plate ( 121, 122 ), said at least two dichroic surfaces ( 121 a, 122 a) adapted to reflect at least one of said received structured light beams (lambda<SUB>1</SUB>, lambda<SUB>2</SUB>), respectively, towards said receivers ( 141, 142 ).
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