公开(公告)号：EP1743139A1

公开(公告)日：2007-01-17

申请号：EP05744805.2

申请日：2005-04-29

申请人： Leica Geosystems AG

发明人： HINDERLING,Jürg

IPC分类号： G01C3/00 ,  G01C15/00 ,  G01S5/16 ,  G01S7/481 ,  G01S17/00

CPC分类号： G01S7/4811 ,  G01C3/00 ,  G01C15/002 ,  G01C15/006 ,  G01S7/4818 ,  G01S17/08

摘要： The invention relates a target acquisition device, wherein attenuating filters (18; 19) are mounted upstream and downstream of a receiver (2) and a transmitter (1), respectively, in order to specifically attenuate radiation portions that originate from zigzag reflections. Said filters attenuate radiation by an intensity of at least a factor of 0.7, preferably at least 0.5 or 0.3. Alternatively or additionally thereto, deflection devices such as a mirror (10) or a cubic prism (14) can be configured so as to attenuate radiation. Since zigzag reflected radiation portions pass through the attenuating devices at least twice as often as regular radiation portions, they are attenuated to a correspondingly higher extent. The entrance surface (5) of the receiver can also be surrounded by a conical deflection surface which substantially absorbs any incident light and reflects the rest to directions different from that of the direction of incidence so that no zigzag reflections can occur.

公开(公告)号：EP1743139B1

公开(公告)日：2010-07-07

申请号：EP05744805.2

申请日：2005-04-29

申请人： Leica Geosystems AG

发明人： HINDERLING,Jürg

IPC分类号： G01C3/00 ,  G01C15/00 ,  G01S5/16 ,  G01S7/481 ,  G01S17/06

CPC分类号： G01S7/4811 ,  G01C3/00 ,  G01C15/002 ,  G01C15/006 ,  G01S7/4818 ,  G01S17/08

摘要： The invention relates a target acquisition device, wherein attenuating filters (18; 19) are mounted upstream and downstream of a receiver (2) and a transmitter (1), respectively, in order to specifically attenuate radiation portions that originate from zigzag reflections. Said filters attenuate radiation by an intensity of at least a factor of 0.7, preferably at least 0.5 or 0.3. Alternatively or additionally thereto, deflection devices such as a mirror (10) or a cubic prism (14) can be configured so as to attenuate radiation. Since zigzag reflected radiation portions pass through the attenuating devices at least twice as often as regular radiation portions, they are attenuated to a correspondingly higher extent. The entrance surface (5) of the receiver can also be surrounded by a conical deflection surface which substantially absorbs any incident light and reflects the rest to directions different from that of the direction of incidence so that no zigzag reflections can occur.