New Iranian Device Measures Laser Safety Glasses
WANA (Jan 27) – An Iranian researcher has invented a device that measures how much laser light passes through the filters of protective eyewear, helping prevent potential eye damage. The device also has military applications.
Amin Dehghaninejad, a PhD graduate in Atomic–Plasma Physics from Tehran Science and Research University, announced the invention of a new device designed to assess the quality of laser safety glasses.
He said the device can precisely measure the amount of laser light transmitted through the filters of protective eyewear, thereby reducing the risk of eye injuries to users.
Explaining the invention, Dehghaninejad noted that the device is a Mach–Zehnder interferometer operating at a wavelength of 808 nanometers, specifically designed to evaluate the effectiveness of laser protective glasses.
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He highlighted the importance of this wavelength, stating that 808 nanometers is widely used in medical applications, particularly in cosmetic and hair-removal lasers. Using unreliable protective glasses at this wavelength can gradually lead to serious and irreversible eye damage.
According to Dehghaninejad, the device works in conjunction with specialized computer software that calculates the exact amount of light passing through the eyewear filter and determines whether the glasses can fully block the harmful wavelength.
He warned that some protective glasses currently on the market may allow 10 to 30 percent of harmful laser light to pass through. If this is not accurately measured, repeated exposure can significantly increase the risk of eye diseases.
He also emphasised the dual-use capability of the invention, noting that in addition to medical applications, the device can be used for military purposes and serves as a precise and essential quality-control tool for manufacturers of laser protective eyewear.
In closing, Dehghaninejad said the prototype was designed and built for the first time by his three-member research team and has no foreign equivalent. He added that efforts to commercialise the device and obtain the necessary certifications are currently underway.
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