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US4229733A
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US
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Exposure detecting device
Assignee: Individual
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Filing: 1978-08-10
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Granted: 1980-10-21
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Expires: 1998-08-10
Abstract
Abstract An exposure detecting device comprising a radiation detector means providing an output signal responsive to the intensity of received ultraviolet radiation, a storage means receiving the output signal of said detector means and providing an output signal which increases as a function of the signal received and its duration, and decreases in the absence of a received signal as a predetermined function of time. A sensitivity control means provides a reference signal, and comparing means receives the output signal of said storage means and the reference signal of said sensitivity control means and delivers an output signal when the storage means output signal exceeds a predetermined value with respect to the reference signal. Alarm means is activated upon receiving an output signal from said comparing means providing an alarm.
Inventors
- 👤 Thomas N. Tulenko
- 👤 Carmen A. Di Camillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:28
CPC Classifications
G; G01; G01W; G01W1/00; G01W1/12; G01D; G01D1/00; G01D1/04; G08; G08B; G08B21/00; G08B21/18; G08B21/182
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
167 words
An exposure detecting device for determining the safe limit for exposure of a subject to ultraviolet radiation comprising a radiation detector means for sensing radiation received by a subject and providing an output signal responsive to the intensity of received ultraviolet radiation, a storage means receiving the output signal of said detector means and providing an output signal which increases as a function of the received output signal and its duration, and decreases in the absence of a received signal as a predetermined function of time corresponding to the recovery rate of the subject to the radiation, a sensitivity control means providing a reference signal related to the sensitivity of the subject to the radiation, comparing means receiving the output signal of said storage means a reference signal from said sensitivity control means and delivering an output signal when the storage means output signal exceeds a predetermined value with respect to the reference signal, and alarm means activated upon receiving an output signal from said comparing means.
Claim 2
Dependent Claim
167 words
An exposure detecting device for determining the safe limit for exposure of a subject to ultraviolet radiation comprising a radiation detector means for sensing radiation received by a subject and providing an output signal responsive to the intensity of received ultraviolet radiation, a storage means receiving the output signal of said detector means and providing an output signal which increases as a function of the received output signal and its duration, and decreases in the absence of a received signal as a predetermined function of time corresponding to the recovery rate of the subject to the radiation, a sensitivity control means providing a reference signal related to the sensitivity of the subject to the radiation, comparing means receiving the output signal of said storage means a reference signal from said sensitivity control means and delivering an output signal when the storage means output signal exceeds a predetermined value with respect to the reference signal, and alarm means activated upon receiving an output signal from said comparing means.
Claim 3
Dependent Claim
30 words
The exposure detecting device of claim 1 in which said detector means is a voltage generating cell, and said storage means is a capacitor which is charged by said cell.
Claim 4
Dependent Claim
22 words
The exposure detecting device of claim 2 in which the capacitor has a charging time constant which exceeds its discharging time constant.
Claim 5
Dependent Claim
48 words
The exposure detecting device of claim 3 including a unidirectional conducting device connected in a series circuit with said cell and capacitor and providing a low forward resistance during the charging of said capacitor by said cell and a high reverse resistance during the discharge of said capacitor.
Claim 6
Dependent Claim
31 words
The exposure detecting device of claim 4 in which the cell is a selenium solar cell and said unidirectional device include a diode element and a series connected current limiting resistance.
Claim 7
Dependent Claim
27 words
The exposure detecting device of claim 1 in which said sensitivity control means provides a selected one of a plurality of reference signals to said comparing means.
Claim 8
Dependent Claim
26 words
The exposure detecting device of claim 6 in which said sensitivity control means includes a switch element for selecting one of said plurality of reference signals.
Claim 9
Dependent Claim
30 words
The exposure detecting device of claim 6 in which said comparing means is an operational amplifier and said alarm means is an audible alarm which is energized by said amplifier.
Claim 10
Dependent Claim
46 words
The exposure detecting device of claim 6 in which the detector means is a voltage generating cell, the storage means is a capacitor means which is charged by said cell, and the time constant for charging the capacitor exceeds the time constant for discharging the capacitor.
Claim 11
Dependent Claim
48 words
The exposure detecting device of claim 9 including a unidirectional conducting device connected in a series circuit with said cell and capacitor and providing a low forward resistance during the charging of said capacitor by said cell and a high reverse resistance during the discharge of said capacitor.
Claim 12
Independent Claim
125 words
A method of detecting on a current basis the safe limit of exposure to ultraviolet radiation of a subject's skin by taking into account the recovery of the subject in the absence of the radiation, which includes the steps of sensing the intensity and duration of radiation to which a subject is exposed, providing a signal having a value which increases as a function of intensity and duration of the radiation to which the subject is exposed, and decreases in the absence of radiation as a predetermined function of time corresponding to the recovery rate of the subject to the radiation exposure, and providing an alarm when the signal exceeds a reference value for indicating that the safe limit for radiation exposure has been reached.
Claim 13
Independent Claim
125 words
A method of detecting on a current basis the safe limit of exposure to ultraviolet radiation of a subject's skin by taking into account the recovery of the subject in the absence of the radiation, which includes the steps of sensing the intensity and duration of radiation to which a subject is exposed, providing a signal having a value which increases as a function of intensity and duration of the radiation to which the subject is exposed, and decreases in the absence of radiation as a predetermined function of time corresponding to the recovery rate of the subject to the radiation exposure, and providing an alarm when the signal exceeds a reference value for indicating that the safe limit for radiation exposure has been reached.
Claim 14
Dependent Claim
21 words
The method of claim 11 in which the signal decreases in the absence of radiation as an exponential function of time.
Claim 15
Dependent Claim
30 words
The method of claim 11 in which the reference value of the signal for providing the alarm is adjusted to correspond to the sensitivity of the subject to ultraviolet radiation.
Claim 16
Dependent Claim
30 words
The method of claim 12 in which the reference value of the signal for providing the alarm is adjusted to correspond to the sensitivity of the subject to ultraviolet radiation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |