4D-LASER SCANNING FOLLOWED
BY
INTERNAL COMPUTER MODEL GENERATION
Ph. Hartl, A. Wehr Institute of Navigation, University Stuttgart
,
Germany, Commission V
G. Pritschow, M. Ioannides Institute for Control Technology for Machine
Tools and Manufacturing Systems, University
Stuttgart, Germany, Commission V
ABSTRACT:
A 4D-laser mapper has been developed, which samples synchronously Cartesian coordinates
with sub millimeter accuracy and the laser intensity reflected from the target's surface.
The array of point measurements data are processed by a program module so that the’
geometry of the object’s surface is described. These transformed data can well be used by
normed interfaces e.g. IGES and VDAFS and linked to CAD/CAM-system for further processing.
By imploying the 4D-laser mapper and the special post processing software the process from
carrying out the measurement to storing valid CAD/CAM-data of any object lasts only
minutes.
The 4D-laser mapper and the new program module will be presented. Typical measurement and
manufacturing results will be shown and discussed with respect to application in CAD/CAM.
KEYWORDS: Laser Mapper, CW Semiconductor Laser, 3D-Measurements, 3D-Reconstruction,
Dublicating Milling Machine, Sculptured Surfaces, CAD/CAM/CAP/CAQ
1. INTRODUCTION
universitily of the quality control loop could be
improved drastically, so that the manufacturing
loop could be accelerated and rationalized. This
would result in reduced manufacturing costs and
The rapid changing market and the steadily raising
quality requirements demand very flexible and fast
process and quality control loops. This is import-
ant especially regarding the improvement of quali-
ty standards new and advanced measurement and ma-
nufacturing strategies must be developed. Flex-
ible, high precision and robust sensors are re-
quired for the registration of measured values.
These devices should operate directly at the
manufacturing machine and should be linked with
Computer Aided Design (CAD) / Computer Aided Manu-
facturing (CAM) systems by a well defined hard and
software interface, in order to obtain a direct
connection to higher level Computer Integrated
Manufacturing (CIM) systems. Only in this case
@ = very high
® = high
Q = middle
©" optical
Q = very low
non contacting sensors
new products could be delivered on the market in
shorter intervals.
Today non-contacting and contacting (tactile)
sensors are used in the production measuring tech-
nique of the machine-tool and molding industry (s.
fig. 1-1). The non-contacting measuring systems
can be classified in optical and acoustical
methods. If the measurement is carried out by
optical means, laser triangulation, holography,
interferometry or photogrammetrical methods are
employed. Acoustical range measurement are re-
Scanning Methods
daz m RAT TE
contacting sensor
i
acoustic !mechanical
Ne tar Pu
mechanical scarining sensor
Triangulation Holography Interferometry Photogrammetry Ultrasonics
n ra
LL
accuracy
resolution
range
technical expense
of the instrument
cost$
vibration
sensitivity,
sensitivity to ;
dust, coolant drains
data errors
appl. with refl.
- objects
Realization in
product.- machines
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Fig. 1-1: Overview of Current Digitizing Methods