TO INCREASE LIGHT EFFICIENCY FRESNEL LENS DESIGN WITH TOTAL INTERNAL REFLECTION STRUCTURE FOR NEAR INFRARED SENSORS
Recently, the development of Fresnel lens for NIR(Near Infrared) is increasing. Near infrared, also called NIR (Near Infrared), has various applications. Used in ADAS, Internet of Thing (IoT), Time of Flight (ToF), beauty and healthcare.
In addition, the demand in the sensor sector is steadily increasing. FresnelFactory Inc. also recently received a request for the development of Fresnel lens that condense the light emitted from the LED with NIR-sensor(Photodiode).
Through optical simulation, Fresnel Factory designed fresnel lens for NIR sensors that increases the light collection efficiency by 37%.
| Without lens | Only fresnel lens | Compared to the without lens | |
| Illuminance | 11.9574mW | 16.4180mW | 37% increase |
However, these was a mechanical problem with the lens mounting. So FresnelFactory Inc designed a Fresnel lens with TIR(Total Internal Reflection) structure that considered not only the light collecting efficiency but also the mechanical problem.
The Fresnel lens with TIR structure increases the light collecting efficiency by 46%
| Without lens | TIR + Fresnel lens | Compared to the without lens | |
| Illuminance | 11.9574mW | 17.5180mW | 46% increase |
This lens was developed to condense the light from the LED with NIR-sensor(Photodiode). However, when used in a laser, the efficiency is reduced.
FresnelFactory Inc. is a professional optics company that performs optical design that considers the optical needs of customer and mechanical problems.
In addition, as it has several optical materials, it is possible to respond quickly to the production stage.
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Ashton Myung Joong KIM
CEO of FresnelFactory Inc.
USA : +1 415 779 5317
MOBILE : +82 10-5248-4630