Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent
1984-04-09
1986-08-26
Church, Craig E.
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
371 16, G01J 532
Patent
active
046084924
ABSTRACT:
The present invention provides a photodosimeter for use by sunbathers and the like and which activates an alarm when a predetermined radiation dosage has been received by the user. The photodosimeter includes a photocell mounted within the housing and exposed to sunlight through a housing opening. This photocell generates an analog output signal proportional to the radiation which impinges upon the photocell. An A/D converter converts the analog signal to a digital signal which is connected to a microprocessor which periodically samples the output from the converter and updates a cumulative radiation dosage counter in memory. When the cumulative radiation dosage exceeds a user settable maximum an alarm is activated. The microprocessor is further programmed to test a plurality of electrical conditions of the photodosimeter and to activate the alarm by a fail safe conduit in the event that one or more conditions are unsatisfied. Specifically, the microprocessor compares the determined radiation dosage to ensure that it falls between 0 and a predetermined maximum amount which are indicative of a nonfunctioning and overload conditions, respectively. The microprocessor further compares the read radiation dosage with the previous maximum amount and, if the current radiation dosage is less than a predetermined percentage, for example 25%, of the maximum amount, indicative that the photocell has been covered or obscured, activates the alarm. Still other electrical conditions of the photodosimeter are reiteratively checked by the microprocessor.
REFERENCES:
patent: 3710115 (1973-01-01), Jubb
patent: 3878496 (1975-04-01), Erickson
patent: 3917948 (1975-11-01), Strutz
patent: 4065672 (1977-12-01), Harpster
patent: 4279254 (1981-07-01), Boschetti et al.
patent: 4317167 (1982-02-01), Hartig et al.
patent: 4428050 (1984-01-01), Pellegrino et al.
patent: 4535244 (1985-08-01), Burnham
Church Craig E.
Hannaher Constantine
Teledyne Industries Inc.
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