Navigation Links
NIST tests underscore potential hazards of green laser pointers
Date:3/20/2013

Using a low-cost apparatus designed to quickly and accurately measure the properties of handheld laser devices, National Institute of Standards and Technology (NIST) researchers tested 122 laser pointers and found that nearly 90 percent of green pointers and about 44 percent of red pointers tested were out of compliance with federal safety regulations. The NIST test apparatus was designed so that it can be replicated easily by other institutions.

As NIST researchers reported at a conference on March 20, 2013,* both red and green laser pointers often emitted more visible power than allowed under the Code of Federal Regulations (CFR), and green pointers often emitted unacceptable levels of infrared light as well.

Anecdotal reports of green laser hazards have previously appeared in scientific journals and the media, but the new NIST tests are the first reported precision measurements of a large number of handheld laser devices. The NIST tests point out that many red laser pointers are alsounexpectedlyout of compliance with federal regulations. "Our results raise numerous safety questions regarding laser pointers and their use," the new paper states.

The NIST tests were conducted on randomly selected commercial laser devices labeled as Class IIIa or 3R and sold as suitable for demonstration use in classrooms and other public spaces. Such lasers are limited under the CFR to 5 milliwatts maximum emission in the visible portion of the spectrum and less than 2 milliwatts in the infrared portion of the spectrum. About half the devices tested emitted power levels at least twice the CFR limit at one or more wavelengths. The highest measured power output was 66.5 milliwatts, more than 10 times the legal limit. The power measurements were accurate to within 5 percent.

According to the American National Standards Institute (ANSI), laser devices that exceed 3R limits may be hazardous and should be subject to more rigorous controls such as training, to prevent injury.**

NIST is a non-regulatory agency with decades of experience providing industry, research and military agencies with laser power measurements traceable to international standards. NIST also has a history of innovation in devices for making such measurements. Technical staff from NIST's Laser Radiometry Project built the laser pointer test bed and collaborated with the NIST Office of Safety, Health and Environment on the tests. NIST has provided its data on laser pointer power measurements to the Food and Drug Administration, which regulates laser product safety.

Green lasers generate green light from infrared light. Ideally, the device should be designed and manufactured to confine the infrared light within the laser housing. However, according to the new NIST results, more than 75 percent of the devices tested emitted infrared light in excess of the CFR limit.

NIST Laser Safety Officer Joshua Hadler designed the measurement test bed.*** The system consists of a laser power meter and two optical filters to quantify the emissions of different wavelengths of visible and infrared light. The power meter and filters were calibrated at NIST. Lens holders ensure repeatable laser alignment, and an adjustable aperture contains the laser light around the output end of the laser.

"The measurement system is designed so that anyone can build it using off-the-shelf parts for about $2,000," Hadler says. "By relying on manufacturers' traceability to a national measurement institute such as NIST, someone could use this design to accurately measure power from a laser pointer."


'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related medicine news :

1. Scientists make older adults less forgetful in memory tests
2. Multiple Tests Needed to Spot Infections in Newborns: Study
3. Family practice offers genetic tests to predict effective psychiatric meds, a CAMH study
4. Maglev tissues could speed toxicity tests
5. Study: Transparent pricing doesnt curb doctors use of high-cost hospital imaging tests
6. AuDNet Pushes for Professional Hearing Tests for All Troops Returning from the Middle East.
7. US Drug Watchdog Now Urges All Zimmer, Stryker, Biomet, Wright and DePuy Metal Hip Implant Recipients to Get Blood Tests
8. New Golf Strength and Flexibility Tests from Somax Performance Institute
9. Combining diagnostic tests more accurate at predicting Alzheimers
10. US Drug Watchdog Now Urges All DePuy ASR And DePuy Pinnacle Hip Implant Recipients To Get Blood Tests And To Call Them For The Names Of The Best Law Firms-Get Compensated
11. Prenatal tests more informative using microarray technology, find GW researchers
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NIST tests underscore potential hazards of green laser pointers
(Date:2/19/2017)... ... ... Braun Industries will be participating as an exhibitor at EMS Today 2017. ... 23-25, 2017 at the Calvin L. Rampton Salt Palace Convention Center in Salt Lake ... on display. , “JEMS is a leader in EMS news and education. ...
(Date:2/19/2017)... ... February 19, 2017 , ... ... in better care, and MEDfx and the Delaware Health Information Network (DHIN) have ... As the nation’s first state-wide health information exchange, DHIN stores and shares real-time ...
(Date:2/18/2017)... ... February 17, 2017 , ... ... Axendia, **FDAnews Free Webinar**, March 1, 2017 — 1:30 p.m. – 2:30 ... regulatory burden? Pay dividends in enhanced and predictable product performance? Streamline processes ...
(Date:2/18/2017)... ... 17, 2017 , ... Butler Mobility invited Ken Matthews to visit its manufacturing ... Ken was impressed with the safety and reliability of the Stannah Stairlift as ... show. This endorsement by Ken Matthews can be heard on News Radio WHP ...
(Date:2/18/2017)... ... February 17, 2017 , ... Park Cities Pet Sitter ... Show on the Pet Life Radio network. The episode, which was posted this ... topics including: what factors led to Park Cities Pet Sitter’s being awarded the 2017 ...
Breaking Medicine News(10 mins):
(Date:2/16/2017)... Research and Markets has announced the addition of ... report to their offering. ... Traditional medical devices include devices (e.g., ... implantables, large endoscopes, needle based drug delivery, lab based diagnostics ... to three decades for the treatment and management of various ...
(Date:2/16/2017)... -- DaVita Inc. (NYSE: DVA ) today announced ... Net income attributable to DaVita Inc. for ... million, or $0.80 per share and $880 million, or $4.29 ... to DaVita Inc. for the quarter and year ended December ... million, or $0.98 per share, and $789 million, or $3.85 ...
(Date:2/16/2017)... 16, 2017  Aralez Pharmaceuticals Inc. (NASDAQ: ... today announced that executive management will participate in the ... February 22-23, 2017. Adrian Adams , Chief Executive ... 1:35 p.m. local time on Wednesday, February 22, 2017. ... the event may be accessed from the Investors section ...
Breaking Medicine Technology: