Browse Prior Art Database

Laser Safety System

IP.com Disclosure Number: IPCOM000076377D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Hayes, LP: AUTHOR

Abstract

Energy detectors used in conjunction with manufacturing and laboratory laser setups, can activate emergency shutters and thereby prevent inadvertent exposure to high-energy levels.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 80% of the total text.

Page 1 of 2

Laser Safety System

Energy detectors used in conjunction with manufacturing and laboratory laser setups, can activate emergency shutters and thereby prevent inadvertent exposure to high-energy levels.

In a permanent setup, a beam of light from laser 1 passes through shutter 2 to various components 3, 4, 5 or 6, such as lenses, filters, splitters, mirrors or gratings to finally converge on a work station 8. An intensity-sensing device 9 is placed in the work plane so as to continuously monitor a sample of the beam energy. If placement of sensor 9 at the work plane is inconvenient, a beam splitter 11 may be used to divert an appropriate sample of the light to a more convenient location, such as 12. The sensor is wired to control circuits 13 which include sensitivity adjustment, bandwidth and degating circuits and which produce an output signal to close shutter 2. Any intrusion into the optical path or disturbance of the components, decreases the energy reaching sensor 9 and produces a signal to close shutter 2. Control circuits 13 can be adjusted to provide a time delay, if necessary, before actuation of the shutter in the event of recurring, short interruptions.

In a laboratory laser setup, a safety device is worn by an observer, as shown in Fig. 2. An extension 20 is provided on the bow 21 of safety glasses or goggles which supports an energy detector 22. Lens 23 partially reflects light energy to the detector, which produces a signal on circuit lines 24 which ar...