Patent US3851970A successfully refreshed from Google Patents.
US3851970A
Expired / Lapsed
US
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Instrument for measuring ultra-violet light
Assignee: Biviator AG
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Filing: 1973-01-03
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Granted: 1974-12-03
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Expires: 1993-01-03
Abstract
Abstract The present invention relates to an instrument for the measure of the intensity of ultra-violet radiation with an optical and photoelectrical converter, an infrared filter of at least 6 mm and an ultra-violet filter of at least 2 mm thickness, the totality of the filters and converters possessing together a spectral sensitivity only for the wavelength domain of 300 to 315 nm, and an amplifier connecting the converters to an indicator instrument such that output readings are given in Mu W/cm2 linearly in the range of at least 100 nW/cm2 to 1 mW/cm2.
Inventors
- 👤 K Adler
- 👤 G Ducommon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:20
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/429
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
An instrument for the measure of the intensity of ultraviolet radiation comprising an optical converter for converting ultra-violet radiation into visible radiation, a photoelectric converter disposed adjacent said optical converter for transforming said visible radiation into an electrical signal, at least one infrared filter and at least one ultra-violet filter disposed one behind the other and having surfaces with dimensions such that the measuring cell has an aperture angle of at least 30*, said filters mounted in front of said optical converter and characterized in that said infrared filter has a thickness of at least 6 mm and said ultra-violet filter a thickness of at least 2 mm, said filters and said converters cooperatively exhibiting a spectral sensitivity only in the effective wavelength domain between 300 and 315 nm, and an amplifier, connecting the measuring cell with an indicator instrument, said amplifier having a transfer function coacting with the non-linear electrical signal from said photoelectric converter such that the reading from said indicator instrument is given in Mu W/cm2 linearly in the range of at least 100 nW/cm2 to 1 mW/cm2.
Claim 2
Dependent Claim
181 words
An instrument for the measure of the intensity of ultraviolet radiation comprising an optical converter for converting ultra-violet radiation into visible radiation, a photoelectric converter disposed adjacent said optical converter for transforming said visible radiation into an electrical signal, at least one infrared filter and at least one ultra-violet filter disposed one behind the other and having surfaces with dimensions such that the measuring cell has an aperture angle of at least 30*, said filters mounted in front of said optical converter and characterized in that said infrared filter has a thickness of at least 6 mm and said ultra-violet filter a thickness of at least 2 mm, said filters and said converters cooperatively exhibiting a spectral sensitivity only in the effective wavelength domain between 300 and 315 nm, and an amplifier, connecting the measuring cell with an indicator instrument, said amplifier having a transfer function coacting with the non-linear electrical signal from said photoelectric converter such that the reading from said indicator instrument is given in Mu W/cm2 linearly in the range of at least 100 nW/cm2 to 1 mW/cm2.
Claim 3
Dependent Claim
25 words
An instrument according to claim 1 wherein said amplifier has an input impedance which is much higher than the internal resistance of the photoelectric converter.
Claim 4
Dependent Claim
42 words
An instrument according to claim 1 further including an electrical device connected to the output of said amplifier for integrating the radiation intensity output signal therefrom and for triggering the generation of an electrical pulse when a predeterminated radiation dose is reached.
References Cited (Backward Citations)
US3062958A
Cited
US3366789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |