Interlocks | previous | next | feedback |
Definition: safety devices for automatically switching off a laser power or interrupting a laser beam
The interlock of a laser is a mechanism which can contribute to laser safety by automatically switching off the laser or by blocking a laser beam, e.g. when a protective box or a door is opened. Commercial lasers often have interlock connections on the back side of the laser driver (i.e. the electronic controls). This is suitable for connecting some device which recognizes potentially dangerous situations:
- An electrical contact may be installed at a door, such that people entering that door are protected.
- A light curtain or a laser scanner may be used to monitor the presence of persons in a dangerous area.
- A people counter at some entry can fulfill the same purpose. It counts the persons entering or leaving the dangerous area.
In some cases, numerical pads allow legitimate (and correspondingly informed) users to override the interlock if they know a certain code.
As interlocks can be annoying in real life, they are often manipulated, particularly in research labs. Therefore, their usefulness for laser safety should not be overestimated.
See also: laser safety
Since October 2008, the Encyclopedia of Laser Physics and Technology is also available in the form of a two-volume book. Maybe you would enjoy reading it also in that form! The print version has a carefully designed layout and can be considered a must-have for any institute library, laser research group, or laser company.
You may order the print version via Wiley-VCH.
