Ferroelectric optical image comparator

Patent Application · Wed Aug 30 00:00:00 EDT 1989

OSTI ID:5933346

Butler, M A; Land, C E; Martin, S J; Pfeifer, K B

The property of ferroelectric ceramics such as lead lanthanum zirconate titanate (PLZT) to store information has been known for many years. This relates to the property of ferroelectric ceramic materials to become permanently polarized when an electric signal is applied to the material. A ferroelectric optical image comparator has a lead lanthanum zirconate titanate thin-film device which is constructed with a semi-transparent or transparent conductive first electrode on one side of the thin film, a conductive metal second electrode on the other side of the thin film, and the second electrode is in contact with a nonconducting substrate. A photoinduced current in the device represents the dot product between a stored image and an image projected onto the first electrode. One-dimensional autocorrelations are performed by measuring this current while displacing the projected image. 5 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC04-76DP00789
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7400851
• Application Number: ON: DE91011597; PPN: US 7-400851
• OSTI ID: 5933346
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
42 ENGINEERING
36 MATERIALS SCIENCE
MEMORY DEVICES
DESIGN
CERAMICS
ELECTRO-OPTICAL EFFECTS
ELECTRODES
FERROELECTRIC MATERIALS
IMAGES
INVENTIONS
PHOTOCURRENTS
PHOTOSENSITIVITY
PLZT
POLARIZATION
SPATIAL RESOLUTION
SUBSTRATES
THIN FILMS
USES
CURRENTS
ELECTRIC CURRENTS
FILMS
LANTHANUM COMPOUNDS
LEAD COMPOUNDS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RESOLUTION
SENSITIVITY
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONATES
ZIRCONIUM COMPOUNDS
440600* - Optical Instrumentation- (1990-)
426000 - Engineering- Components
Electron Devices & Circuits- (1990-)
360603 - Materials- Properties