CA2407533C - Optical telemeter - Google Patents
Optical telemeter Download PDFInfo
- Publication number
- CA2407533C CA2407533C CA002407533A CA2407533A CA2407533C CA 2407533 C CA2407533 C CA 2407533C CA 002407533 A CA002407533 A CA 002407533A CA 2407533 A CA2407533 A CA 2407533A CA 2407533 C CA2407533 C CA 2407533C
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- Canada
- Prior art keywords
- target illumination
- deflection element
- illumination apparatus
- optical telemeter
- laser diode
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/002—Active optical surveying means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Semiconductor Lasers (AREA)
- Glass Compositions (AREA)
- Liquid Crystal (AREA)
- Measurement Of Optical Distance (AREA)
- Surgical Instruments (AREA)
- Laser Surgery Devices (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photoreceptors In Electrophotography (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
In order to improve target illumination, a light source (2) of an emitter, which has a laser diode (3) configured as an edge emitter with a wavelength of 1'550 nm, has beam forming optics (4) mounted downstream in relation thereto , which comprise a cylindrical lens (7) and a first deflection element (8) wit h three fields having different diffraction structures. Said deflection elemen t deflects partial beams exiting from successive segments of the emission edge to three fields of a second deflection element (10) which are located next t o one another and crosswise in relation to the first fields and which also hav e different diffraction structures. Said deflection element directs the partia l beams to the aperture of a collimator (1) in such a way that the partial bea ms substantially fill said aperture. The first deflection element (8) and a mou nt (6) for the cylindrical lens (7) are integral and, alike the second deflecti on element (10), are made of plastic. Both parts are glued to opposite sides of the frontal areas of a block (5) made of glass.
Description
11, UKI. ZUU1 14:40 UU413 3yy1U49 IVtt, ylb4 ~, Lb/4U
DESCRIPTION
OPTICAL TELEMETER
Technical field The invention relates to an optical telemeter such as employed for instance in the surveying of piots of land and buildings.
Prior art Optical telemeters of this kind have been known for somc timc alrcady. The lascr diodcs used as light sources have the disad.vantage, however, that the light beam exiting at the emission edge has a very long and narrow cross section. This lcads to poor target illumination, since only parn of the light beam strikes the target thus detracting from the range and from measuring accuracy. Moreover, reflection of parts of the beam missing the target at other objects, which for instance are more distant, may acutely disturb the mcasurcrnents, Aescrfiptlon of the invention The iztvenxion is based on the task to specify an optical telemeter of the above kind providing a better target illumination than known tclcmctcrs of this kind_ The advantages attained by the invention chiefly reside in a decisive improvement of range, i.e., the maximum distance that can be measured or, for a given range, in an increased rrteasuring accuracy.
Brief description of the drawings zn the following, the invention is described in greater detail with the aid of figures representing mcrcly one embod7snent.
11, UK I, 1UV1 14: 4U UU4'Lj jyy I U4y Ivh(, y I b4 ~, (y/4U
DESCRIPTION
OPTICAL TELEMETER
Technical field The invention relates to an optical telemeter such as employed for instance in the surveying of piots of land and buildings.
Prior art Optical telemeters of this kind have been known for somc timc alrcady. The lascr diodcs used as light sources have the disad.vantage, however, that the light beam exiting at the emission edge has a very long and narrow cross section. This lcads to poor target illumination, since only parn of the light beam strikes the target thus detracting from the range and from measuring accuracy. Moreover, reflection of parts of the beam missing the target at other objects, which for instance are more distant, may acutely disturb the mcasurcrnents, Aescrfiptlon of the invention The iztvenxion is based on the task to specify an optical telemeter of the above kind providing a better target illumination than known tclcmctcrs of this kind_ The advantages attained by the invention chiefly reside in a decisive improvement of range, i.e., the maximum distance that can be measured or, for a given range, in an increased rrteasuring accuracy.
Brief description of the drawings zn the following, the invention is described in greater detail with the aid of figures representing mcrcly one embod7snent.
11, UK I, 1UV1 14: 4U UU4'Lj jyy I U4y Ivh(, y I b4 ~, (y/4U
Figure 1a schematically shows a lateral view of an emitter of a telemeter according to the invention.
Figure 1b schematically shows a top view of the emitter according to Figure I
a, Figure 3 shows a top view in bearxi direction of a first deflection element of the emitter according to Figures 1 a, b, Figure 4 shows a top view counter to the beam direction of a second deflection element of the emitter according to Figures 1 a, b, and Figure 5 shows the target ill **-+*+Ation attained by the emitter according to Figures 1a, b.
Ways to practice the invention An optical telemeter according to the invention comprises an emitter as well as a receiver tkaat, in known manncr. can for instancc be built up with optics and avalanche photodiodes, and further cormprises an electronic control and evaluating unit also of known design controlling the emission of light pulses by the emitter and evaluating the output signal of the receiver. The distan,ce can be measured by transit-time deterznina.txon or by the phasc-xnatching technique.
The emitter has a collimator 1 and a light source 2 put in front of it which is composed of a laser diode 3 and beam forming optics 4. The laser diode 3 is an edge emitter emitting electromagnetic waves in the infrared, preferably at a wavelength between 850 nm and 980 nm or a wavelength % = 1,550 z1um. The emai,ssion edge has a Iength between 30 m and g00 m while its width is between 1 zn and 3 m. The emission edge may bc intcrruptcd in its lomgiltudinal direction. For im.stance, instead of one laser diode 3 a linear array of laser diodes having edge lengths of for instance 50 .m and distanccs bctw-ccn succcssive edges of 100 m could be provided. The numerical aperture corresponding to the sine of half the angular aperture has a valuc of 0.1 parallel to the emission cdge and of 0.6 to 0.7 transverse 21. UKI. 1UU1 14;4U 0041j jyylU4y irR. y io(+ 0. )viI+u to this edge. The product of these two quantities, knowrx as space bandwith product (SBP), in a direction transverse to the emission edge approximately corresponds to the wave-lcngth, and thus is practically monomodal (transverse nnodo of 0), i.c_, it is closc to a fundamental limiting value that cannot be exceeded, while parallel to the emission edge it is larger than this limiting valuc by a factor of 10 to 100. Even in this dixectilon. the 5BP
cannot be altered by conventional refracting elements such as lenses, but with the aid of elements based on diffraction or refraction of light, it can be lowered very close to the emission edge by rearrangement in a direction parallel to the emission edge but instead be enhanced in a direction tzazasvexse to ihis edge, and thus the light beam can be more strongly collimated.
This xs the purposc of the bcam forming optics 4 con-iprising a parallclcpipcdal block 5 consistiaag of a transparent material, preferably glass, with a first front face turned toward the ].ascr diodc 3 and an opposite second front face turned toward the eollimator 1_ The grst front face supports a mount 6 of plastic holding a cylindrical lens 7 at its terminal zones.
The cylindrical lens 7 has a czzculax cross section, its diameter is about 60 xn_ It is oriented parallel to the emission edge of laser diode 3 and spaced apart from tlus diode by about 10 l.tm, The beam exiting from the emission edge which for laser diodes of the kind employed has a large transverse radiation angle of about 80 is madc parallel by it.
The diameter of the cylindrical lens and its distance from the emission edge may also be much larger than the given values, but for small valucs, particularly for values of at most 65 tn and at most 15 zn, respectively, the overlap of the -fractions coherently radiated from successive rcgions of the edge is very small so that the losses caused by this overlap are also kept low.
Downstream of the cylindrical lens 7 a~iurst detXection element S is arranged which is integral with the mount 6 and has a structured surface that is essentially plane and parallel to the first front face of block 5. Parallel to the emission edge it is divided into three successi,vc fZclds 9a, b, c having different steppcd diffraction structures.
The second, opposite front face of block 5 suppports a second deflection element 10 consisting of plastic and comprising a structurcd surface essentially plane and psrallel to the second front face that is divided into three successive fields 11 a, b, c transverse to the emission edge also having different stepped ditf~eaction struetures.
21, OKT, 2002 14;40 00413 j991049 iN K. y 10 4 4 PCT/EP 01l02204 The upper field 9a of the first deflection element 8 has a structuee such that it deflects the partial bcam cxiting from an uppcr scgmcnt of the emission odgc and striking it to the lcft-hand field 11a (looking in beam direction) of the second deflection element 10 where the beazn is insignificantly deflected so that it will strike the collimator 1 and approximately fill the left-hand third of the collimator's aperture. In exactly corresponding manner, the lower field 9c of the first deflection element 8 deflects the paztial beam exiting from a lower segment of the exnassion edge and striking it, to the right-hand field 11c (looking in beam direction) of the second deflection element 10, where this beam, too, is deflected precisely in the corresponding way and then fills approximately the right-hand third of thc aperture of collimator 1. The central third of the collimator is filled by the partial beam exiting from a slightly shorter central segnent of the emission edge and passing without deflection through the unstxuctured central fields 9b and 11b of the first deflection element 8 and second deflection clement 10, zespectively.
'T'hus, the three partial beams are so deflected in different ways by the first deflection element 8 that they strike the second deflection element 10 side by side (when looking in a direction tzansverse to the emission edge), hence their projections onto a plane formed by thc dircctions of the exnission edge and of the bcam csscntially coincide. In the second de#Xection element 10 they are then so deflected in different ways that they strike the collimator 1 as if they all came from a line parallel to the emission edge in the focal plane of collimator 1 or, stated differently, in such a way that their back extrapolation will lead to such a line, and tbat each partial beam fills approximately one third of the aperrture of collimator 1. The three successive segments of the emission edge are imagcd onto a ncarly square field, and indeed in such a way that they are superimposed in the far field (Figure 5). This secures an excellent target illumination.
At wavelengths between 850 mzza a.xid 950 nm the beam can be collimated very strongly, allowing a range scan with high lateral resolution. Wavelengths around 1,550 nm are also very advantageous, since then the upper limit of the admissible single-pulse energy which is defined in terms of safety to the eyes has a value of about 8 mJ and thus is higher by a facto,t of about 16,000 than at wavelengths between 630 and 980 nm. By employing this 11, UKI. 1UUZ 14;4U UU4'Lj jyylU4y IVtt. ylb4 5. ~L/4U
'= WO 01/84077 5 PCT/EP 01/02204 factor at least in part, which becomes possible because of better beam concentration according to the invention, one can very substantially increase the range or, for a given range, raise the sensitivity.
The mount 6 and the first deflection element 8 that is integral with it, as well as the second deflection element 10, each are produced by one of the replication techniques as described in M. T. Gale, 'Replication', in H. P. Herzig (editor), 'Micro-Optics', Taylor & Francis 1997, pp. 153-177, for instance by etching of a cylinder or piston of quartz and by hot ombossing, injcction molding, or casting followed by UV curing, and are then bonded to block 5. The defuntion of the diffraction structures can be performed with known computer programs. The rcplication tecbnique allows large numbers of parts to be fabricated at favorable cost. Since the mount 6 is also made by this teehnique, a very precise positioning of cylindrical lens 7 is possible. The tolerated va,riation of distance between the lens and the first defleotion element 8 is a fcw micrometers. Using soldering and active adjustment as described i.zx DE-A- 197 51352, the laser diode 3 can then be bonded in such a way to the beam forming optics 4 that the tolerated variation of mounting between it and the cylindrical lens 7 is about 0.5 zn.
Various modifications of the embodiment described are possible. Thus, the cylindrical lens may bc fastened with cement directly to the laser diode. The first deflection element and the second deflection element may also consist of glass, and for instance be madc by an etching process. They may also be etched directly into the block separating them. The number of fields in the deflection elements may be two, four or morc, instcad of three. The beam forming optics may consist of refracting elements, for instance prisms and plates.
Finally, laser diodes having wravelengt.hs particularly between 600 nm and 1,000 nm, arnd more particularly between 630 nm and 980 zum which are outside the regions indicated above can be cmploycd.
List of reference symbols 1 Collimator 2 Light source 11, UKI, 2UU1 14.41 UU42j jyy IU4y iyrc. y 104 0. 7)/4u ' CA 02407533 2002-10-25 3 Laser diode 4 Beam forming optics Block 6 Mount 5 7 Cylindricallerxs 8 first deflection element 9a,b,c Fields second deflection element 11 ab,c Fields
Figure 1b schematically shows a top view of the emitter according to Figure I
a, Figure 3 shows a top view in bearxi direction of a first deflection element of the emitter according to Figures 1 a, b, Figure 4 shows a top view counter to the beam direction of a second deflection element of the emitter according to Figures 1 a, b, and Figure 5 shows the target ill **-+*+Ation attained by the emitter according to Figures 1a, b.
Ways to practice the invention An optical telemeter according to the invention comprises an emitter as well as a receiver tkaat, in known manncr. can for instancc be built up with optics and avalanche photodiodes, and further cormprises an electronic control and evaluating unit also of known design controlling the emission of light pulses by the emitter and evaluating the output signal of the receiver. The distan,ce can be measured by transit-time deterznina.txon or by the phasc-xnatching technique.
The emitter has a collimator 1 and a light source 2 put in front of it which is composed of a laser diode 3 and beam forming optics 4. The laser diode 3 is an edge emitter emitting electromagnetic waves in the infrared, preferably at a wavelength between 850 nm and 980 nm or a wavelength % = 1,550 z1um. The emai,ssion edge has a Iength between 30 m and g00 m while its width is between 1 zn and 3 m. The emission edge may bc intcrruptcd in its lomgiltudinal direction. For im.stance, instead of one laser diode 3 a linear array of laser diodes having edge lengths of for instance 50 .m and distanccs bctw-ccn succcssive edges of 100 m could be provided. The numerical aperture corresponding to the sine of half the angular aperture has a valuc of 0.1 parallel to the emission cdge and of 0.6 to 0.7 transverse 21. UKI. 1UU1 14;4U 0041j jyylU4y irR. y io(+ 0. )viI+u to this edge. The product of these two quantities, knowrx as space bandwith product (SBP), in a direction transverse to the emission edge approximately corresponds to the wave-lcngth, and thus is practically monomodal (transverse nnodo of 0), i.c_, it is closc to a fundamental limiting value that cannot be exceeded, while parallel to the emission edge it is larger than this limiting valuc by a factor of 10 to 100. Even in this dixectilon. the 5BP
cannot be altered by conventional refracting elements such as lenses, but with the aid of elements based on diffraction or refraction of light, it can be lowered very close to the emission edge by rearrangement in a direction parallel to the emission edge but instead be enhanced in a direction tzazasvexse to ihis edge, and thus the light beam can be more strongly collimated.
This xs the purposc of the bcam forming optics 4 con-iprising a parallclcpipcdal block 5 consistiaag of a transparent material, preferably glass, with a first front face turned toward the ].ascr diodc 3 and an opposite second front face turned toward the eollimator 1_ The grst front face supports a mount 6 of plastic holding a cylindrical lens 7 at its terminal zones.
The cylindrical lens 7 has a czzculax cross section, its diameter is about 60 xn_ It is oriented parallel to the emission edge of laser diode 3 and spaced apart from tlus diode by about 10 l.tm, The beam exiting from the emission edge which for laser diodes of the kind employed has a large transverse radiation angle of about 80 is madc parallel by it.
The diameter of the cylindrical lens and its distance from the emission edge may also be much larger than the given values, but for small valucs, particularly for values of at most 65 tn and at most 15 zn, respectively, the overlap of the -fractions coherently radiated from successive rcgions of the edge is very small so that the losses caused by this overlap are also kept low.
Downstream of the cylindrical lens 7 a~iurst detXection element S is arranged which is integral with the mount 6 and has a structured surface that is essentially plane and parallel to the first front face of block 5. Parallel to the emission edge it is divided into three successi,vc fZclds 9a, b, c having different steppcd diffraction structures.
The second, opposite front face of block 5 suppports a second deflection element 10 consisting of plastic and comprising a structurcd surface essentially plane and psrallel to the second front face that is divided into three successive fields 11 a, b, c transverse to the emission edge also having different stepped ditf~eaction struetures.
21, OKT, 2002 14;40 00413 j991049 iN K. y 10 4 4 PCT/EP 01l02204 The upper field 9a of the first deflection element 8 has a structuee such that it deflects the partial bcam cxiting from an uppcr scgmcnt of the emission odgc and striking it to the lcft-hand field 11a (looking in beam direction) of the second deflection element 10 where the beazn is insignificantly deflected so that it will strike the collimator 1 and approximately fill the left-hand third of the collimator's aperture. In exactly corresponding manner, the lower field 9c of the first deflection element 8 deflects the paztial beam exiting from a lower segment of the exnassion edge and striking it, to the right-hand field 11c (looking in beam direction) of the second deflection element 10, where this beam, too, is deflected precisely in the corresponding way and then fills approximately the right-hand third of thc aperture of collimator 1. The central third of the collimator is filled by the partial beam exiting from a slightly shorter central segnent of the emission edge and passing without deflection through the unstxuctured central fields 9b and 11b of the first deflection element 8 and second deflection clement 10, zespectively.
'T'hus, the three partial beams are so deflected in different ways by the first deflection element 8 that they strike the second deflection element 10 side by side (when looking in a direction tzansverse to the emission edge), hence their projections onto a plane formed by thc dircctions of the exnission edge and of the bcam csscntially coincide. In the second de#Xection element 10 they are then so deflected in different ways that they strike the collimator 1 as if they all came from a line parallel to the emission edge in the focal plane of collimator 1 or, stated differently, in such a way that their back extrapolation will lead to such a line, and tbat each partial beam fills approximately one third of the aperrture of collimator 1. The three successive segments of the emission edge are imagcd onto a ncarly square field, and indeed in such a way that they are superimposed in the far field (Figure 5). This secures an excellent target illumination.
At wavelengths between 850 mzza a.xid 950 nm the beam can be collimated very strongly, allowing a range scan with high lateral resolution. Wavelengths around 1,550 nm are also very advantageous, since then the upper limit of the admissible single-pulse energy which is defined in terms of safety to the eyes has a value of about 8 mJ and thus is higher by a facto,t of about 16,000 than at wavelengths between 630 and 980 nm. By employing this 11, UKI. 1UUZ 14;4U UU4'Lj jyylU4y IVtt. ylb4 5. ~L/4U
'= WO 01/84077 5 PCT/EP 01/02204 factor at least in part, which becomes possible because of better beam concentration according to the invention, one can very substantially increase the range or, for a given range, raise the sensitivity.
The mount 6 and the first deflection element 8 that is integral with it, as well as the second deflection element 10, each are produced by one of the replication techniques as described in M. T. Gale, 'Replication', in H. P. Herzig (editor), 'Micro-Optics', Taylor & Francis 1997, pp. 153-177, for instance by etching of a cylinder or piston of quartz and by hot ombossing, injcction molding, or casting followed by UV curing, and are then bonded to block 5. The defuntion of the diffraction structures can be performed with known computer programs. The rcplication tecbnique allows large numbers of parts to be fabricated at favorable cost. Since the mount 6 is also made by this teehnique, a very precise positioning of cylindrical lens 7 is possible. The tolerated va,riation of distance between the lens and the first defleotion element 8 is a fcw micrometers. Using soldering and active adjustment as described i.zx DE-A- 197 51352, the laser diode 3 can then be bonded in such a way to the beam forming optics 4 that the tolerated variation of mounting between it and the cylindrical lens 7 is about 0.5 zn.
Various modifications of the embodiment described are possible. Thus, the cylindrical lens may bc fastened with cement directly to the laser diode. The first deflection element and the second deflection element may also consist of glass, and for instance be madc by an etching process. They may also be etched directly into the block separating them. The number of fields in the deflection elements may be two, four or morc, instcad of three. The beam forming optics may consist of refracting elements, for instance prisms and plates.
Finally, laser diodes having wravelengt.hs particularly between 600 nm and 1,000 nm, arnd more particularly between 630 nm and 980 zum which are outside the regions indicated above can be cmploycd.
List of reference symbols 1 Collimator 2 Light source 11, UKI, 2UU1 14.41 UU42j jyy IU4y iyrc. y 104 0. 7)/4u ' CA 02407533 2002-10-25 3 Laser diode 4 Beam forming optics Block 6 Mount 5 7 Cylindricallerxs 8 first deflection element 9a,b,c Fields second deflection element 11 ab,c Fields
Claims (16)
1. Optical telemeter target illumination apparatus, comprising:
at least one light source for target illumination, and a collimator collimating radiation emitted by said light source prior to target illumination, said light source being arranged in front of said collimator, said light source comprising at least one laser diode having an emission edge, said emission edge including successive segments, said light source having beam forming optics mounted downstream of said at least one laser diode for illuminating said collimator, said light source generating offset partial beams, wherein said offset partial beams are emitted from the successive segments of the emission edge of the at least one laser diode, the offset partial beams being parallel to the emission edge and overlapping, said beam forming optics comprising a first deflection element based on diffraction or refraction of light and a second deflection element based on diffraction or refraction of light, each of said first and second deflection elements having plane surfaces divided into at least two fields.
at least one light source for target illumination, and a collimator collimating radiation emitted by said light source prior to target illumination, said light source being arranged in front of said collimator, said light source comprising at least one laser diode having an emission edge, said emission edge including successive segments, said light source having beam forming optics mounted downstream of said at least one laser diode for illuminating said collimator, said light source generating offset partial beams, wherein said offset partial beams are emitted from the successive segments of the emission edge of the at least one laser diode, the offset partial beams being parallel to the emission edge and overlapping, said beam forming optics comprising a first deflection element based on diffraction or refraction of light and a second deflection element based on diffraction or refraction of light, each of said first and second deflection elements having plane surfaces divided into at least two fields.
2. Optical telemeter target illumination apparatus according to claim 1 wherein said at least one laser diode emits with a wavelength between 850 nm and 980 nm.
3. Optical telemeter target illumination apparatus according to claim 1 wherein said at least one laser diode emits with a wavelength of approximately 1,550 nm.
4. Optical telemeter target illumination apparatus according to claim 1 wherein said beam forming optics comprise a cylindrical lens immediately following after said at least one laser diode, said cylindrical lens having an axis that is parallel to the emission edge of said at least one laser diode.
5. Optical telemeter target illumination apparatus according to claim 4 wherein the diameter of said cylindrical lens is less than or equal to 65 µ.
6. Optical telemeter target illumination apparatus according to claim 4 wherein the distance between the emission edge and said cylindrical lens is less than or equal to 15 µ.
7. Optical telemeter target illumination apparatus according to claim 1 wherein said first deflection element deflects the partial beams in different ways in a direction transverse to the emission edge and also in a direction parallel to the emission edge, wherein the partial beams strike the second deflection element substantially side by side, the second deflection element orienting the partial beams as beams originating from a line in a focal plane of the collimator.
8. Optical telemeter target illumination apparatus according to claim 7, wherein the fields of each of said first and second deflection elements are oriented parallel to the emission edge and contain different diffraction structures, and wherein the number of fields of the second deflection element corresponds to the number of fields of said first deflection element, the fields of the second deflection element containing different diffraction structures.
9. Optical telemeter target illumination apparatus according to claim 7, wherein said beam forming optics comprise a block of transparent material with a first front face to which said first deflection element is fastened and an opposite second front face to which said second deflection element is fastened.
10. Optical telemeter target illumination apparatus according to claim 7, wherein said first deflection element and the said second deflection element are made of a plastic.
11. Optical telemeter target illumination apparatus according to claim 9 wherein said cylindrical lens is tied to a mount fastened to the first front face of said block.
12. Optical telemeter target illumination apparatus according to claim 11 wherein said first deflection element is integral with said mount.
13. Optical telemeter target illumination apparatus according to claim 11 wherein said at least one laser diode is fastened to said block by soldering.
14. Optical telemeter target illumination apparatus according to claim 4 wherein said cylindrical lens is fastened to said at least one laser diode with cement.
15. Optical telemeter target illumination apparatus according to claim 1 wherein said beam forming optics is designed to superimpose the partial beams in a far field.
16. Optical telemeter target illumination apparatus according to claim 1 wherein said beam forming optics is designed for imaging the partial beams in the far field onto a nearly square field.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00108836.8 | 2000-04-26 | ||
| EP00108836A EP1150097A1 (en) | 2000-04-26 | 2000-04-26 | Optical rangefinder |
| PCT/EP2001/002204 WO2001084077A1 (en) | 2000-04-26 | 2001-02-28 | Optical telemeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2407533A1 CA2407533A1 (en) | 2002-10-25 |
| CA2407533C true CA2407533C (en) | 2008-08-05 |
Family
ID=8168556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002407533A Expired - Lifetime CA2407533C (en) | 2000-04-26 | 2001-02-28 | Optical telemeter |
Country Status (8)
| Country | Link |
|---|---|
| EP (2) | EP1150097A1 (en) |
| JP (1) | JP4753341B2 (en) |
| AT (1) | ATE297544T1 (en) |
| AU (2) | AU5616701A (en) |
| CA (1) | CA2407533C (en) |
| DE (1) | DE50106457D1 (en) |
| NO (1) | NO334674B1 (en) |
| WO (1) | WO2001084077A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2001298040B2 (en) * | 2001-10-17 | 2007-05-24 | Leica Geosystems Ag | Optical telemeter |
| EP1882899A1 (en) | 2006-07-17 | 2008-01-30 | Leica Geosystems AG | Electro-optical distance meter |
| DE102012100746B4 (en) * | 2012-01-31 | 2022-10-06 | Leuze Electronic Gmbh & Co. Kg | Transmission unit for an optical sensor |
| CN107346062B (en) * | 2017-08-04 | 2023-05-02 | 大连理工大学 | Method for collimating diode laser beam |
| CN109975784B (en) * | 2019-03-21 | 2021-08-17 | 深圳市速腾聚创科技有限公司 | Collimating device, transmitting system and laser radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH670896A5 (en) * | 1986-08-13 | 1989-07-14 | Zellweger Uster Ag | |
| JPS63247716A (en) * | 1987-04-03 | 1988-10-14 | Fuji Xerox Co Ltd | Beam converter |
| DE3827458C3 (en) * | 1988-08-12 | 1998-04-09 | Michael H Dipl Ing Korte | Method and device for determining the spatial coordinates of any measuring point |
| JP2896782B2 (en) * | 1988-12-30 | 1999-05-31 | 株式会社トプコン | Pulse type lightwave distance meter |
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| US5557475A (en) * | 1994-07-12 | 1996-09-17 | Coherent, Inc. | Optical system for improving the symmetry of the beam emitted from a broad area laser diode |
| DE19500513C1 (en) * | 1995-01-11 | 1996-07-11 | Dilas Diodenlaser Gmbh | Optical arrangement for chip formed multiple semiconductor laser array |
| DK0803075T3 (en) * | 1995-01-11 | 2003-03-31 | Ullmann Christoph Dr | Optical device for use in a laser diode system |
| DE19645150C2 (en) * | 1996-10-28 | 2002-10-24 | Fraunhofer Ges Forschung | Optical arrangement for symmetrizing the radiation from laser diodes |
| US6044096A (en) * | 1997-11-03 | 2000-03-28 | Sdl, Inc. | Packaged laser diode array system and method with reduced asymmetry |
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-
2000
- 2000-04-26 EP EP00108836A patent/EP1150097A1/en not_active Ceased
-
2001
- 2001-02-28 EP EP01929368A patent/EP1287312B1/en not_active Expired - Lifetime
- 2001-02-28 AT AT01929368T patent/ATE297544T1/en not_active IP Right Cessation
- 2001-02-28 DE DE50106457T patent/DE50106457D1/en not_active Expired - Lifetime
- 2001-02-28 AU AU5616701A patent/AU5616701A/en active Pending
- 2001-02-28 CA CA002407533A patent/CA2407533C/en not_active Expired - Lifetime
- 2001-02-28 JP JP2001581055A patent/JP4753341B2/en not_active Expired - Lifetime
- 2001-02-28 AU AU2001256167A patent/AU2001256167B2/en not_active Expired
- 2001-02-28 WO PCT/EP2001/002204 patent/WO2001084077A1/en active IP Right Grant
-
2002
- 2002-10-24 NO NO20025113A patent/NO334674B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU2001256167B2 (en) | 2005-06-16 |
| NO20025113L (en) | 2002-12-13 |
| DE50106457D1 (en) | 2005-07-14 |
| NO20025113D0 (en) | 2002-10-24 |
| CA2407533A1 (en) | 2002-10-25 |
| JP4753341B2 (en) | 2011-08-24 |
| AU5616701A (en) | 2001-11-12 |
| NO334674B1 (en) | 2014-05-12 |
| ATE297544T1 (en) | 2005-06-15 |
| EP1287312B1 (en) | 2005-06-08 |
| EP1150097A1 (en) | 2001-10-31 |
| EP1287312A1 (en) | 2003-03-05 |
| WO2001084077A1 (en) | 2001-11-08 |
| JP2004518107A (en) | 2004-06-17 |
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Effective date: 20210301 |