Laser radiation detector using polyvinylidene fluoride film

A pyroelectric radiation detector comprising:

• a temperature sensitive element made of a polarized polyvinylidene fluoride film having first and second surfaces;
• a directionally deposited graphite layer, well thermally and electrically contacted with said temperature sensitive element, said graphite layer having first and second sides and having a configuration of a planar plate having an area in the range of 2 mm.sup.2 to 36 cm.sup.2, and a thickness in the range of 50 to 200 .mu.m, said polarized polyvinylidene film having an area larger than said graphite layer;
• a first electrode comprised of a stripe-shaped metal frame well electrically contacted with said graphite layer on said first side thereof;
• a second electrode comprised of a copper-coated board plated with gold or silver well electrically contacted with said graphite layer on said second side thereof;
• and
• a metal housing shielding the whole said detector.

A pyroelectric radiation detector comprising:

• a temperature sensitive element made of a polarized polyvinylidene fluoride film having first and second surfaces;
• a directionally deposited graphite layer, well thermally and electrically contacted with said temperature sensitive element, said graphite layer having first and second sides and having a configuration of a conical cavity having a calibre, vertex angle, and wall thickness ranging from 5 to 60 mm, 22.5.degree. to 60.degree., and 150 to 300 .mu.m, respectively, said polarized polyvinylidene film being coextensive with the outer surface of said conical cavity;
• a first electrode comprised of a metal ring well electrically contacted with said graphite layer on said first side thereof;
• a second electrode comprised of a silver film well electrically contacted with said graphite layer on said second side thereof;
• and
• a metal housing shielding the whole said detector.