ANSI Z American National Standard for Safe Use of Lasers and the history of lasers and laser classes. Since the last ANSI Z standard was published, developments in laser devices and laser applications have prompted research into the bioeffects involving. The ANSI Z is a parent document and cornerstone of the Z series of laser safety standards, the Z is the foundation of laser safety programs for.
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New Revision of ANSI Z136.1 (Laser Safety Standards)
In the past several years the use of laser pointers has proliferated significantly. Similarly Class 2M applies to visible lasers which are safe when viewed by the unaided eye for up to 0. This should be contrasted with previous generations of laser pointers that were based on HeNe lasers and were generally classified as Class 2.
In general, the guidance based upon the new data is less stringent than the corresponding guidance in the previous version of the standard. The new hazard signs contain an equilateral triangle attention symbol in addition to the familiar sunburst pattern. The appendix contains numerous examples that illustrate and clarify the application of the new methodology.
Currently few differences exist between the two standards. Maximum Permissible Exposures MPEs The new standard revises the tables containing MPEs, and methods by which hazard evaluation and laser classifications are done for ocular exposure of small intrabeam viewing and extended source viewing.
They are routinely used in demonstrations, alignment, educational, and numerous other applications. This newly revised standard will contain several important additions and changes to the last ANSI Z Separate tables are provided for dealing with the two distinct viewing conditions, and dual limits photochemical and thermal for the appropriate spectral range are provided.
This would allow users to better prepare for eventual adoption of these changes. Guidance is stajdard offered in the use of laser eyewear in conjunction with ultrashort pulses. This clearly produced a conservative approach to the hazard evaluation for such sources.
New Revision of ANSI Z (Laser Safety Standards)
Thus in the visible part of the spectrum, Class 2 range is 0. Three new classes of lasers are being created 1M, 2M and 3R. Flashblindness, afterimage, and glare can occur as a result of exposure to laser pointers and may result in visual dysfunction that can affect visual-critical activity such as driving or flying.
Visit the LIA website at http: Class 1M is composed wnsi lasers, which are incapable of causing eye damage except when viewed with optical instruments. CopyrightLaser Institute of America. Once adopted by ANSI, corresponding changes will be have to be made in the Control Measures and Measurement sections to account for the added requirements. The ramifications of these changes are relatively small.
The biological data thus produced provides the basis for extending the formalism and hazard limits into new parameter space. The ANSI Z specifies sign dimension, lettering size, color, and other important sign design elements.
The process for conducting hazard evaluation and analysis is thus greatly simplified, and would be welcome by laser safety officers and others who are charged tsandard the responsibility of performing laser hazard evaluation and classification as part of an overall hazard analysis. The Control Measures section of the new standard specifically treats safety issues associated with laser pointers, and provides guidance for z13.61 safe use of these products.
The IEC recognizes that their current classification scheme is problematic particularly as it relates to evaluations with and without optically aided viewing.
Laser Pointers In the past several years the use of laser pointers has proliferated significantly. While it is unlikely stanfard momentary exposure to laser pointers will cause permanent retinal damage, exposure to these devices can cause other visual impairment.
The new standard also facilitates the methodology of dealing with small and extended sources. With the emergence of new biological data for sub-nanosecond pulses, more precise and less conservative guidance is provided in the new standard asni ultrashort pulses down to femtoseconds in the retinal hazard region of 0.
The great proliferation of these devices has made it more likely that individuals who are not familiar with appropriate safety precautions would use them. The most important changes contained in the newly revised standard are described below.
All current Class 1 lasers will become Class 1 and Class 1M. To help rectify the situation, the IEC is considering slight modification to their classification sfandard that would more clearly define risk levels under reasonably foreseeable use. The Class 1 category is therefore significantly expanded for those lasers. Most current Class 2 will remain Class 2 or will become 2M if they possess a highly divergent beam.