Classifications

• • 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
• • 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
  • G01S7/497—Means for monitoring or calibrating

Definitions

• the invention relates to a flow device for non-contact distance measurement, in particular a hand-held device, according to the preamble of claim 1.
• Such a V screenêt designed as a handheld device also called a distance measuring device, is known for example from DE 198 04 051 A1 or DE 196 52 438 C2.
• the measuring device works according to the principle of running time measurement, in that a light signal or light pulses are emitted from the transmission path to the appropriate object, which is reflected on the object and is picked up again by the measuring device via the reception path, and the transit time of the light signal or the light pulse , that is the time span between transmission time and reception time, is measured. This period is a measure of that
• the transit time can be determined, for example, by correlating the transmit and receive signals.
• the measuring device for contactless distance measurement has the advantage that the components is achieved by the inventive placement that displayed over the entire temperature range of the light spot generated by the optical transmission path • at an appropriate object in the optical receive path is thus seen.
• a temperature-related curvature of the device module carrying the components does not influence the measurement process, and the maximum possible light intensity of the one emitted via the optical transmission path is always transmitted via the optical reception path
• the transmission and reception paths are optically folded in such a way that the transmitter and receiver lie together on a flat fastening surface fixed in the device module.
• the receiving optics can be shorter on the one hand, but on the other hand without the need for additional optical components, such as light guides, transmitters and receivers that significantly reduce the efficiency of the receiving optics, can be installed in the common mounting surface. If the device module bends due to temperature, then the fastening surface fixed to it bends, and the light spot generated by the transmitter on the measurement object and the field of view of the receiver on the measurement object migrate in the same way. The light triangle and field of vision thus remain congruent even when the temperature changes.
• the device module has an optics carrier and a printed circuit board which is fixedly connected to the optics carrier and forms the fastening surface for the optical transmitter and the optical receiver.
• the optical folding of the transmission and reception path is carried out by means of deflecting mirrors arranged in the optics carrier.
• housing the transmitter and receiver, including their electronic components, on a common printed circuit board makes it possible to make contact with the transmitter and receiver and their components that is simple in terms of production technology, and at the same time simple shielding from the outside from the environment is feasible, in particular if, according to an advantageous embodiment of the invention the electronic components are arranged on the underside of the circuit board facing the optics carrier.
• a shielding can then be easily implemented by a shielding layer in the preferably multilayer printed circuit board, which is connected in an electrically conductive manner to the optics carrier at at least one point.
• the printed circuit board extends as parallel as possible to a plane running through the optical axes of the transmission and reception path.
• the deflection mirrors are designed as optical filters in order to limit the bandwidth of the light reflected on the appropriate object and picked up by the optical receiver.
• the transmission and reception paths are separated from one another by chambers and channels formed in the optics carrier, so that, on the one hand, no light from the transmission beam hits the Receiver arrives and on the other hand, the electrical crosstalk of the signals on the transmitting and receiving side is significantly reduced by electrical shielding.
• a closable window is provided in a partition wall of the optics carrier that separates the channel for the transmission path from the channel for the reception path.
• a deflection element is arranged in the channel for the transmission path, which can be pivoted into the transmission path in such a way that a transmission light beam falling on the deflection element is introduced through the window into the reception path.
• the deflection element preferably closes the window in the partition between the two channels in its position pivoted out of the transmission path.
• Fig. 1 is a bottom perspective view of a device module with the
• Fig. 2 shows a section along the line II - !! in Fig. 1,
• FIG. 3 shows a section along the line III-lil in FIG. 2,
• the device module 11 seen in perspective in bottom view in FIG. 1 and in different sectional views in FIGS. 2-4, which is enclosed by a housing after the measuring device has been completely assembled, carries the
• the device module 11 has an optics carrier 14 and a circuit board 15 fastened on the optics carrier 14 by means of screws 16 (FIGS. 3 and 4).
• the circuit board 15 is arranged on the optics carrier 14 as parallel as possible to a plane which runs through the optical axes 121 and 131 (FIG. 2) of the transmission path 12 and reception path 13 and coincides with the leaf plane in FIG. 2.
• the transmission and reception paths 12, 13 are separated from one another by channels and chambers 18-21 formed in the optics carrier 14, in FIG. 3 the transmission channel 18 and the transmission chamber 19, which is oriented at right angles to the transmission channel 18, and in FIG. 4 the reception channel 20 and to see the receiving chamber 21, which is also oriented at right angles to the receiving channel 20.
• the arrangement of the transmission channel 18 and reception channel 20 in the optics carrier 14 can be seen in the sectional view in FIG. 2.
• the components of the optical transmission path 12 include an optical one
• Transmitter 22 which is designed as a collimator 24 with a laser diode 25 and a collimator lens 26 (FIG. 3), a glass cover plate 27, which closes the transmission channel 18 at the front, and a deflection mirror 28 arranged at the other end of the transmission channel 18, which can be adjusted on the optics carrier 14 is held.
• the optical axis 121 of the transmission path 131 can be adjusted via the deflection mirror 28.
• the components of the optical reception path 13 comprise a receiver optics 29 and a receiver 30 arranged downstream thereof, which here is designed as a light detector 31 (FIG. 4).
• the receiver optics 29 consist of a receiver lens with a large end that closes the reception channel 20 on the front Focal length and a deflection mirror 33 placed at the other end of the receiving channel 20, which is held adjustable in the optics carrier 14. Both the focal point and the direction of the optical axis 131 of the reception path 13 can be changed and adjusted via the deflection mirror 33.
• Both the collimator 24 and the light detector 31 are fastened to the printed circuit board 15, specifically on the underside facing the optics carrier 14 and are there with further electronic components, not shown here, of the transmitter 22 and receiver 30, which are also on the underside of the printed circuit board 15 are arranged, contacted.
• the transmitter 22 and receiver 30 and the electronic components are shielded from the outside by a shielding layer (not shown here) in the multilayer printed circuit board 15, which is electrically conductively connected to the optics carrier 14 at at least one point.
• Transmitter 22 and receiver 30 are arranged closely next to one another at a distance transversely to the optical axis 121, 131, the collimator 24 protruding into the detection chamber 19 and the light detector 31 into the receiving chamber 21, so that the transmitter 22 and receiver 30 are optically and electrically shielded from one another ,
• This placement of the transmitter 22 and receiver 30 ensures that a deformation of the optics carrier 14 taking place by the connection of the circuit board 15 and optics carrier 14 at a temperature change, which leads to a curvature of the optics carrier 14 in the direction of the optical axes 121, 131, the optical Axes 121, 131 of transmission path 12 and reception path 13 are deflected in the same direction by the same amount.
• the measurement spot generated by the transmission path 12 is always fully imaged on the light detector 31 in the reception path 13 ′′ on an appropriate object, so that the curvature of the optics carrier 14 does not increase affects the measuring accuracy of the device.
• a deflecting element 36 is pivotally arranged so that it can be pivoted into the beam path in the transmitting channel 18, that is to say in the transmitting path 12, and out of the beam path in the transmitting channel 18, that is to say out of the transmitting path 12. In the pivoted-in position, the deflecting element 36 directs a light beam coming from the deflecting mirror 28 through the window 35 into the

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Optical Radar Systems And Details Thereof (AREA)
• Measurement Of Optical Distance (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=7706635

Family Applications (1)

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• 2001
  • 2001-11-22 DE DE10157378A patent/DE10157378B4/de not_active Expired - Fee Related
• 2002
  • 2002-10-11 EP EP02782714A patent/EP1451607A2/de not_active Withdrawn
  • 2002-10-11 US US10/495,810 patent/US7142288B2/en not_active Expired - Fee Related
  • 2002-10-11 JP JP2003547990A patent/JP2005510739A/ja active Pending
  • 2002-10-11 CN CNB028231813A patent/CN100442079C/zh not_active Expired - Fee Related
  • 2002-10-11 WO PCT/DE2002/003872 patent/WO2003046604A2/de active Application Filing

Non-Patent Citations (1)

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