Laser Innovations - Manufacturer of Entertainment Laser Systems

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		You are here: Products > Projection Heads > ScanFail Detection ScanFail Detection Our Commitment To Safety All new Laser Innovations systems which are used to audience scan are fitted with scan fail detection. OLDER INSTALLATIONS CAN BE UPGRADED Please Contact Us For Details The Scan Fail Detector was designed by Dave Hickford of Laser Innovations for use in its own products and by ELA members. The ELA organisation has been set up to promote the safe use of Lasers for entertainment. Over the past 25 years the laser industry has had an excellent safety track record with no proven injuries. However, as always, safety to the public and operators is regarded as paramount. Utilising the vast experience of its members, many with more than 15 years experience in the laser light show industry, ELA will continue to further promote lasers for entertainment, and is committed to developing a working code of practice for the industry. The development of the Scan Fail Detector (SFD) was a particular goal for us and ELA, with the aim of being able to offer it to all members, to be incorporated into their own type of optical scanning systems, and has been designed with this foremost in mind. Research by Laser Innovations has proved that this may not be possible in all cases, as the SFD cannot be guaranteed to work with all early makes of scanning amplifier designs. For example, amplifiers which are not capable of fast enough response times will register as an error, forcing the scanning output to be blanked. The design has been tested on Cambridge Technologies 6210, 6800, Laser Innovations 6800 amplifiers and also its 3 axis G120 amplifier. Description The card contains all the electronics to detect system faults, but requires integrating into the blanking or shutter system of the scanning head. The Scan Fail Detector is capable of detecting four types of error. These are: (A) Scanner failure causing positional feedback error. (B) Minimum size scan error (effect too small) (C) Operator tried to put a single beam outside a pre-defined area. (D) Failure of the power supplies to the control and scanning equipment. The design incorporates an error detection stage which compares the drive waveform against the positional feedback signal produced by the galvanometer when it's moving. If any difference is detected (after the galvanometer has reached its position) this will cause an error, forcing the on-board relay contacts to open. The design also incorporates a minimum size detector, which is set to prevent small size scans (i.e. less then 10% of maximum scan angle) from being projected. Attempting to project beams will cause the relay contacts to open and the beam terminated. However, this function can be overridden (for beam positioning to mirrors etc. outside the non-scan area) by electrically defining a window. Pre-setting left/right and up/down points will allow the minimum size limits to be exceeded. The cost of this board for ELA Members is Ł75.00 Non-members Ł375.00
Last Updated: 18th March 2008

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