Radiant energy – Photocells; circuits and apparatus – Housings
Patent
1976-02-13
1977-06-14
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Housings
250215, H01J 502, H01J 3912
Patent
active
040299597
ABSTRACT:
A plant light sensor adaptor for converting a plant soil moisture monitoring device into a plant light sensing device is provided. The plant soil moisture monitoring device includes first and second metal electrodes and an indicator coupled to the electrodes for sensing and indicating current flow due to the electro-galvanic response produced by the difference in the redox potential in the first and second metal electrodes, which current flow is controlled by the moisture content of the plant soil under test. The adaptor includes a reference member having a receiving portion for receiving the first and second metal electrodes, the receiving portion including first and second spaced apart electrically isolated contacts, the receiving portion being constructed and arranged to bring the first and second contacts respectively into electrical contact with the first and second metal electrode, and photosensitive circuitry coupled to the respective first and second spaced apart electrically isolated contacts, the photosensitive circuitry being adapted to detect the luminous flux incident thereon and in response thereto apply through the respective first contact and electrode, and through the respective second contact and electrode current signal representative of the luminous flux detected by the photo-sensitive circuitry, whereby the indicator senses and indicates the luminous flux detected by the photosensitive circuitry.
REFERENCES:
patent: 3383979 (1968-05-01), Gibson
patent: 3487221 (1969-12-01), Frank
Cottingham Hugh
Scrocco Joseph
BHN, Inc.
Moore David K.
Smith Alfred E.
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