view release on metacpan or  search on metacpan

FresnelZone.pm  view on Meta::CPAN

It takes the first two arguments only: distance in miles and frequency in GigaHertz

 my $fzr_in_feet = fresnelMi($Mi,$GHz);

=head2 EXPORT

None by default. You can export any of the 3 functions as in the synopsis example.

=head2 VARIABLES

These variables are used when using miles/feet instead of kilometers/meters to modify the input for the formula and the output for the user:

   $Math::FresnelZone::KILOMETERS_IN_A_MILE  (Default is 1.609344)
   $Math::FresnelZone::FEET_IN_A_METER (Defualt is 3.280839)

Feel free to change them if you need more or less than six decimal places and/or want really inaccurate results :)

=head1 SEE ALSO

To find out more about the fresnel zone (pronounced fray-NELL) you can google the man who this formula/zone is named after to learn more: Augustin Jean Fresnel.

Mr. Fresnel was a French physicist who supported the wave theory of light, investigated polarized light, 
and developed a compound lens for use in lighthouses (IE the "Fresnel lens") (1788-1827).

Also googling the phrase "Fresnel Zone" turns up some interesting glossary refernces to what the fresnel zone is.

Here is a link to an image illustrating what a fresnel zone is and the formula:
L<http://drmuey.com/images/fresnelzone.jpg>

=head1 AUTHOR

Daniel Muey, L<http://drmuey.com/cpan_contact.pl> 

=head1 COPYRIGHT AND LICENSE

Copyright 2004 by Daniel Muey