• Home
  • The Group
  • R & D
  • Media
  • Library
  • Career
  • Contact

VACUUM TECHNOLOGY

Premier vacuum science and cutting-edge technology

THIN FILM TECHNOLOGY

Precision equipment and deposition processes

THIN FILMS & OPTICS

Precision components and Nano technology coatings

CUSTOM PROJECTS

Engineering project Management & Process technology

  • Home
  • Thin Films & Optics
  • Thin film coatings
  • NIR Filters
  • Thin film coatings
    • UV Curing
    • Optical Filters
    • Laser Mirrors
    • Anti Reflection Coatings
    • Beam splitters
    • Metallic coatings
    • Optical windows
    • NIR Filters
    • EMI Shielding Coatings
    • Infrared coatings
    • Decorative Coatings
    • Thin Film Circuits
    • ITO Coatings
    • Hard Coatings
    • Operation theatre reflectors
  • Horology
  • Deposition Materials & Consumables
  • Optics Fabrication Laboratory
  • Lithography

Share

Bookmark and Share

Follow

 

NIR Filters

Near Infrared transmitting filters reflect virtually all visible light while allowing only near infrared photons to pass through them.

NIR FILTERS FOR NEAR INFRARED ILLUMINATION

NIR filter for near IR illuminationA popular and sometimes inexpensive method for performing night vision is by near infrared illuminations. In this mehtod, a standard high power lamp that is covered by the near infrared filter designed to pass the lamp's near infrared radiation and block the visible light component is used. Providing supplemental infrared illumination of an appropriate wavelength not only eliminates the variability of available ambient light, but also allows the observer to illuminate only specific areas of interest while eliminating shadows and enhancing image ontrast.

The supplemnetal near infrared lighting not only improves the quality of image intensifier devices but also permits the use of solid state cameras, which also have the ability to convert near infrared images to visible.

 

NIR FILTERS FOR OPTHALMIC DEVICES

NIR filter for opthalmic lensesOpthalmic deviceslike "iris scanners" use near Infrared (NIR) imaging by emitting 750nm wavelength low-power light. This is done because dark-brown eyes, possessed by the majority of the human population, reveal rich structure in the NIR but much less in the visible band (400  700nm), and also because NIR light is invisible and unintrusive. A further important reason is that by allowing only this selected narrow band of illuminating light back into the camera via NIR filters, most of the ambient corneal reflections from a bright environment are blocked from contaminating the iris patterns

Print

Contact

T: +91 80 41931000 / 1090

F: + 91 80 2839 4874

E: infotfd@hhv.in

Online Enquiry

Enquiry Form

 

* mandatory fileds

 
 

All rights reserved © 2014 HHV Ltd.

Home  |  Privacy Policy  |  Diclaimer

Created by Intellimedia