Material sensing device

Details Material sensing device Material sensing device

1976-06-16

1978-07-25

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6121, 250229, 307118, 340606, 340617, 340619, G08B 2100

Patent

active

041032926

ABSTRACT:
A material sensing device comprising a flexible or collapsible tube with a light sensitive device therein which receives light through the tube from a spaced apart light emitting device. The signal from the light sensitive device is amplified and used to operate a silicon controlled rectifier that snap actuates a solenoid operated switch. The invention includes an amplifying circuit in which the amplifier is the load for the silicon controlled rectifier and a generally fixed bias is provided to the gate of the SCR with the result that the circuit automatically resets the SCR during normal operation.

REFERENCES:
patent: 781444 (1905-01-01), Moebeck
patent: 3184188 (1965-05-01), Rossire
patent: 3313946 (1967-04-01), Goodwin et al.
patent: 3526775 (1970-09-01), Friedrich et al.
patent: 3550447 (1970-12-01), Beresic
patent: 3697708 (1972-10-01), Beresic

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