Pyroelectric detector and vidicon

• US 4,492,857 A
• Filed: 09/07/1982
• Issued: 01/08/1985
• Est. Priority Date: 09/09/1981
• Status: Expired due to Fees

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Peuzin, Jean C., Gauthier, Sylviane, Averbuch, Marie-Therese, Nicolau, Ion F., Durif-Varambon, Andre
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Gatto, James
• Application Number:
  US06/415,702
• Time in Patent Office: 854 Days
• Field of Search: 250/211 R, 252/62.9 R, 423/299, 423/306, 423/508
• US Class Current: 250/214.1
• CPC Class Codes: H01J 29/458 pyroelectrical targets; targets for infrared or ultraviolet or X-ray radiations
• CPC Class Codes: H10N 15/15 Thermoelectric active materials

Abstract

The invention relates to an ammonium phosphotellurate pyroelectric vidicon and detector.

The pyroelectric detector comprises a dielectric material inserted between two parallel electrodes, said material being a monodomain ferroelectric monocrystal having a polaraaxis, wherein the said material is ammonium phosphotellurate of chemical formula:

Te(OH.sub.6), 2[NH.sub.4 H.sub.2 PO.sub.4 ], [(NH.sub.4).sub.2 HPO.sub.4 ].

Claims

1. A pyroelectric radiation detector comprising a dielectric material inserted between two parallel electrodes, said material being a monodomain ferroelectric monocrystal having a polar axis, wherein the said material is ammonium phosphotellurate of chemical formula:

space="preserve" listing-type="equation">Te(OH).sub.6, 2[NH.sub.4 H.sub.2 PO.sub.4 ], [(NH.sub.4).sub.2 HPO.sub.4 ].

2. A pyroelectric detector according to claim 1, wherein the polar axis of the monocrystal is perpendicular to the faces of the latter in contact with the electrodes.

3. A pyroelectric detector according to claim 1, wherein the polar axis of the monocrystal is inclined by an angle α

relative to the normal to the faces of the monocrystal placed in contact with the electrode.

4. A pyroelectric detector according to claim 3, wherein the angle α

is 10° and

80°

C.

5. A pyroelectric vidicon comprising a dielectric material inserted between a parallel grid and electrode, said material being able to emit, after radiation absorption, a signal detected point-by-point by means of an electron beam and being a monodomain ferroelectric monocrystal having a polar axis, wherein the material is ammonium phosphotellurate of chemical formula:

space="preserve" listing-type="equation">Te(OH).sub.6, 2[NH.sub.4 H.sub.2 PO.sub.4 ], [(NH.sub.4).sub.2 HPO.sub.4 ].

6. A pyroelectric vidicon according to claim 5, wherein the polar axis of the monocrystal is perpendicular to the faces of the latter in contact with the grid and the electrode.

7. A pyroelectric vidicon according to claim 5, wherein the polar axis of the monocrystal is inclined by an angle α

relative to the normal to the faces of the monocrystal in contact with the grid and the electrode.

8. A pyroelectric vidicon according to claim 7, wherein the angle α

is between 10° and

80°

.