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is sometimes irrelevant for this purpose and can often be detected even without an IMU. A special Z+F high speed 2D laser scanner (2x 500 profiles/sec) is in use at the Metropolitan Transport Association in New York City, US.


Z+F PROFILER® 9012 features Zoller + Fröhlich provides an extremely fast rotating profiling 2D laser scanner with the Z+F PROFILER®


affordable and compact. It is absolutely safe to use due to its laser class 1 classification.


The synchronisation capabilities of the system system offer the user more secure options by using PPS, odometer- and line-syncronisation signals. The Z+F PROFILER®


9012 has a simple memory


concept (USB-based) and does not require expensive RAID storage systems. In addition to a web interface, the controlling and configuration of the Z+F PROFILER®


9012 could be integrated


individually in client’s software, with help of the Z+F SDK. Hence, the Z+F PROFILER®


9012 is an open and free


configurable laser scanner. The recorded data can be displayed in real time and current status messages can be queried. This provides additional opportunities for quality assurance during the data recording.


The spindle head of the Z+F PROFILER®


9012, turns with staggered 9012 which is


rotation frequencies of 50Hz, 100Hz and 200Hz (profiles per second). So even at high vehicle speeds, relatively small profile distances can be achieved with a high resolution. As an example: even at a speed of 70km/h, profiles with a distance of ~10cm can be recorded. Additionally, the resolution (number of pixels per profile) can be freely chosen between 5120, 10240, 20480 Pixel/360°. Usually a common time signal is used, when the multiple data streams of different sensors are synchronised (sometimes also with different data rates). This could be a GPS signal with a corresponding PPS pulse (PPS = pulse per second) or a simple linear counter with a different, but constant defined time interval.


The Z+F PROFILER® 9012 can receive TE_forgetrack_dis 25/4/12 14:21 Page 1


these signals and combine them with the recorded data stream of the laser measurements. It can also generate its own signals, which can be used in other sensors for data syn-chronisation. A specific type of synchronisation is used, when two Z+F PROFIL-ER® 9012 operate in parallel to each other in a way, so that the two spanned planes of the laser beams absolutely coincide with each other. This arrangement could


create the risk of measurement errors, if the outgoing laser beam of scanner one returns directly into the receiver optics of the second scanner. For this reason, the Z+F PROFILER®


9012 is equipped with


an additional synchronisation interface, which allows matching up the two motor controllers. In this case, the positions of the two spindles of the laser scanners are synchronised in such a way that they have an offset of 90° and thus do not affect the individual measurements of each scanner.


Key features of the Z+F PROFILER® 9012 laser scanner • laser class 1 – certified eye safety • 360° field of view • data storage (internal 128GB + external 2x32GB USB)


• various synchronisation interfaces a) external time synchronisation by using a simple time stamp


b) external time synchronisation with help of a GPS/PPS signal


c) external odometer signals d) internal framesync-signal /linesync- signal


• synchronisation of two parallel operating Z+F PROFILER®


systems. • 9012


Tel: +49 (0) 7522 9308-261 Visit: www.zofre.de or www.zf-laser.com


Multidisciplined contractor with extensive experience in the rail, light rail & tram industry throughout the UK


We provide the following services: 


    


For full details ring Linda on 01992 500900 or email training@forgetrack.co.uk


3rd/4th Rail Installation & Maintenance P-Way & Technical Services Civil Engineering


OLE Installation & Maintenance Telecoms & Communications


Plant & Operator Hire (RRV MEWPs, haulage, etc.) With offices in London,Manchester & Newcastle


Unit 8, Fleetway Business Park, 14-16 Wadsworth Road, Perivale, UB6 7LD


Tel: 020 8998 0010 Fax: 020 8998 6901 Email: enquiries@pod-trak.com


February 2014 Page 153


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