Richard Farrar

Life, Technology and Everything...

  • Home
  • About
    • Musical Interests
      • Tap Thru’ – Band
      • RedStick – Duo
    • PhD Thesis
    • Patent
    • Digital Radio Design
    • Privacy Policy
    • Cookie Policy
    • Terms of Use
  • Podcasts
    • The PlantAdvice Gardening Podcast
  • Podcast Equipment
  • Podcasting Resources  
    • Top Podcast Directories
    • Featured Podcast Widget for WordPress
    • Skype Interview Guidelines for Guests
  • Archives
    • Polls Archive
  • Contact

Covert Marking Patent

US Patent 6,100,967

This is a patent that I co-authored during my time working for a small Laser firm based in South Wales.

The patent was developed during some tests using a Carbon Dioxide Laser to mark certain transparently coated materials. When the Laser power was turned down, no obviously visible mark was made, but if viewed under polarised light, a legible mark became clearly visible.

The patent expands on this principle of monitoring marks covertly via polarised light, which could have numerous security based applications.

patentMonitoring of Covert Marks

Richard Farrar and Barry Hood

A method and apparatus for monitoring a body having a reflective surface, a coating layer of material transparent to visible light present on the surface and producing a covert optical discontinuity in an imagewise distribution on the layer, the imagewise distribution is such that it is visible via polarised light and viewing through a polarised filter.

[PDF : covert_marks_us.pdf 261 kB]

BBC Radio Interview on Podcasting

Listen to my interview on BBC radio about podcasting and how long a podcast should be:

https://www.richardfarrar.com/audio/BBC-interview.mp3

Topics

  • Blogging
  • Life
  • Podcasting
  • Technology
  • Web Technology

About Me

Richard Farrar

Hi, I'm Richard; an Electronic Engineer by trade, self confessed Geek, Blogger and Podcaster, although as often the case life has the habit of taking us on unplanned journeys... Read More ›

Popular Posts

  • Embedding Album Art in MP3 Files
  • How to Check if your Speakers are Wired Correctly
  • Song Capacity Calculator for MP3 Players
  • What is Joint Stereo?
  • What are ID3 Tags in MP3 Files?

Find Me Online

  • Twitter
  • YouTube
  • RSS Feed

Copyright © 2023
All details subject to change without notice. E&OE. All rights reserved.