bpzle 0 Posted April 13, 2010 I'm not too sharp with math... Anyone have some sort of online calculator to get me an idea of approximate coverage with IRs... I know I shouldn't trust spec sheets, but I'd like to at least get an idea... I need to know how wide the throw will be at various distances from an illuminator, dependent on the angle rating of course... Share this post Link to post Share on other sites
Soundy 1 Posted April 19, 2010 Would really depend on the design of the specific illuminator - the LEDs used, reflector/lens design, how the LEDs themselves are mounted and positioned... manufacturer data sheets are your best bet. Share this post Link to post Share on other sites
rory 0 Posted April 19, 2010 They will differ by brand and model just as cameras do (get what you pay for) but this is an example for what use to be 2 popular IR illuminators, Again, wont apply to other models. Share this post Link to post Share on other sites
bpzle 0 Posted April 19, 2010 Thanks for the replies. I guess I'm just looking for a simple geometry calculator... Something where I can punch in the angle degree and know the width of the throw at various lengths... surely something like this exists? Share this post Link to post Share on other sites
Soundy 1 Posted April 19, 2010 That's just it though - the width of the beam at a given distance will depend on the unit's design. There is no "universal calculator". What you're looking for is really just basic geometry - the beam pattern can be thought of as a triangle, so if you know the width at a given distance, you can calculate the width at another distance. You can use standard Pythagorean math (a^2 + b^2 = c^2), or basic sin/cos calculations. Or just think of it as a simple ratio: if the beam is 10' wide at 20' from the source, it will be 20' wide at 40' from the source. Inverse-square law then states the light level will be 1/4 of what it was at 20'. Share this post Link to post Share on other sites
