Measuring laser shows accurately
In order to prevent eye damage at laser shows, adherence to threshold values is essential. Until now, measurements have been costly and only carried out in individual cases, as a result of which the threshold values are generally exceeded. The new Laser Show Risk Analyzer (LASRA) provides organisers and authorities with an important tool with which to assess laser shows and compliance with the Sound Levels and Laser Ordinance (SLO).
Although fascinating, laser shows are not always harmless. In order to avoid serious eye damage, threshold values have been stipulated by law and are required to be adhered to by laser show organisers. Laser show measurements have demonstrated that the threshold values are often exceeded many times over. Moreover, the number of laser shows has significantly increased in recent years on account of the declining prices for suitable systems.
Up to now, it has been very difficult to assess the risk potential of a complete laser show. For this reason, the Federal Institute of Metrology (METAS) has developed a new assessment system in collaboration with the Federal Office of Public Health (FOPH): the Laser Show Risk Analyzer (LASRA). LASRA measures the planned laser show in real time at the venue. Should the show exceed the threshold value, solutions can be sought in conjunction with the organisers. Minor technical adjustments are often sufficient to minimise the risk and adhere to the SLO threshold values. In this way, safe laser shows can be achieved and bans avoided.
The LASRA hardware consists essentially of a photo sensor which initially measures the intensity of the lasers used. The LASRA software then directly analyses the program used to control the laser show. From this, LASRA determines whether the threshold values are being adhered to. LASRA was intensively tested during the pilot phase in recent months. The device worked reliably, was well received by organisers and authorities and is already attracting international interest.
Last modification 25.06.2020