| http://www.w3.org/ns/prov#value | - Long range light pen apparatus for weapons training, comprising a two-element optic system having a first bi-convex lens and a second bi-concave lens; a photodiode optically downstream from said lenses for providing a current signal at its output in response to the light; and circuitry including means coupled to said output of said photodiode for converting said current signal to a voltage signal
|
