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:10/12/2017)... , ... October 12, 2017 , ... The American College ... to Carol Friedman, PhD, FACMI, during the Opening Session of AMIA’s Annual Symposium in ... , In honor of Morris F. Collen, a pioneer in the field of medical ...
(Date:10/12/2017)... ANGELES (PRWEB) , ... October 12, 2017 , ... ... Parsa Mohebi Hair Restoration, has recently contributed a medical article to the newly ... on cosmetictown.com. Dr. Mohebi’s article spotlights the hair transplant procedure known as ...
(Date:10/12/2017)... , ... October 12, 2017 , ... On Saturday, October ... treadmill relay – Miles by Moonlight to raise money for the American Heart Association ... more. , Teams will work together to keep their treadmills moving for 5 ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... in property taxes a year. In some states—like New York, New Jersey, Massachusetts, ... contrast, many overseas retirement havens have extremely low property-tax rates, which contributes to ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... content management, presents its enhanced Pepper Flow promotional review platform at the ... Pepper Flow’s increased insight-driven capabilities help marketers streamline the medical, legal, and ...
Breaking Medicine News(10 mins):
(Date:10/11/2017)... FRISCO, Texas , Oct. 11, 2017 /PRNewswire/ ... healthcare services, has amplified its effort during National ... patients about hereditary cancer risks. ... Journal of Clinical Oncology calculated that more than ... to have inherited mutations in BRCA1 or BRCA2 and ...
(Date:10/7/2017)... , Oct. 6, 2017   Provista, a ... than $100 billion in purchasing power, today announced a ... information. The Newsroom is the online home ... trends, infographics, expert bios, news releases, slideshows and events. ... to a wealth of resources at their fingertips, viewers ...
(Date:10/4/2017)... 4, 2017 OBP Medical , ... medical devices, today announced regulatory approval from ... (or Agência Nacional de Vigilância Sanitária (ANVISA)) to ... surgical retractor with integrated LED light source and ... and exposure of a tissue pocket or cavity ...
Breaking Medicine Technology: