Electronic device for reading information stored in a substance

Details Electronic device for reading information stored in a substance Electronic device for reading information stored in a substance

1996-04-04

1998-02-10

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

25037009, 250591, G01J 144

Patent

active

057172153

ABSTRACT:
An electronic apparatus comprising a material having photoconductivity, an energy bandgap, and trap levels. The material is typified by a thin film of polycrystalline diamond. The material is illuminated with first light having photon energies smaller than the energy bandgap of the material. Then, the material is illuminated with second light having photon energies greater than the energy bandgap of the material to thereby induce a photocurrent. The amount of the first light can be known by measuring the induced photocurrent.

REFERENCES:
patent: 3375372 (1968-03-01), Miyashita
patent: 3576546 (1971-04-01), Heyman et al.
patent: 5300784 (1994-04-01), Fender et al.
patent: 5327373 (1994-07-01), Liu et al.
patent: 5469424 (1995-11-01), Inushima et al.

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