Patent US3628034A successfully refreshed from Google Patents.
US3628034A
Expired / Lapsed
US
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Device to detect motion and measure speed from the delayed fluorescence of aromatic compounds
Assignee: EIDP Inc
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Filing: 1970-06-26
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Granted: 1971-12-14
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Expires: 1990-06-26
Abstract
Abstract Motion is detected or speed is measured by producing an image of the moving object or series of objects in a material which displays the phenomenon of delayed fluorescence and measuring the intensity of the delayed fluorescence, or modulating the intensity of the imaging light and measuring the phase shift of the resulting modulation of the delayed fluorescence. A device for the above comprises a crystalline material which displays the phenomenon of delayed fluorescence, a light source directed at this crystalline material, and a photomultiplier tube to measure the intensity of the delayed fluorescence, or a mechanical chopper to modulate the intensity of the imaging light and two photomultiplier tubes, a tracking filter and a digital phase meter to measure the phase shift of the resulting modulation of the delayed fluorescence.
Inventors
- 👤 Vladimiro Ern
- 👤 Richard E Merrifield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:55
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6408; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/347; G01P; G01P3/00; G01P3/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A device for detecting motion comprising a crystalline material in which radiation can produce triplet excitons which subsequently generate delayed fluorescence by mutual annihilation, optical means for directing light onto said crystalline material, first mounting means holding said crystalline material and said optical means in fixed relation, means for periodically modulating the intensity of said light, second mounting means holding said modulating means in the path of said light, and means for measuring the phase shift of the resulting time modulation of the delayed fluorescence with respect to that of the exciting light.
Claim 2
Independent Claim
93 words
A device for detecting motion comprising a crystalline material in which radiation can produce triplet excitons which subsequently generate delayed fluorescence by mutual annihilation, optical means for directing light onto said crystalline material, first mounting means holding said crystalline material and said optical means in fixed relation, means for periodically modulating the intensity of said light, second mounting means holding said modulating means in the path of said light, and means for measuring the phase shift of the resulting time modulation of the delayed fluorescence with respect to that of the exciting light.
Claim 3
Dependent Claim
13 words
The device of claim 2 wherein said optical means is a laser device.
Claim 4
Dependent Claim
17 words
The device of claim 2 wherein said optical means comprises a laser device and a lens system.
Claim 5
Dependent Claim
17 words
The device of claim 1 wherein said optical means comprises a laser device and a beam-bending mirror.
Claim 6
Dependent Claim
35 words
The device of claim 1 wherein said crystalline material is selected from the group consisting of anthracene, 9,10-diphenylanthracene, 2-chloroanthracene, 2,t-butylanthracene, 1,8-dichloroanthracene, 1,5-dichloroanthracene, 4,5-iminophenanthrene, phenanthrene, 4,5-methylenephenanthrene, naphthalene, 1,4-dibromonaphthalene, pyrene, p-terphenyl, transstilbene, 4,4''-dimethoxystilbene, 9,9-bianthryl, tetracene and 2-bromofluorene.
Claim 7
Dependent Claim
11 words
The device of claim 5 wherein said crystalline material is anthracene.
Claim 8
Dependent Claim
27 words
The device of claim 1 wherein said modulating means is a mechanical chopper consisting essentially of a wheel with a cutout sector rotating at a constant speed.
Claim 9
Dependent Claim
35 words
The device of claim 1 wherein said modulating means is a mechanical chopper consisting essentially of a linear polarizer rotating at a constant speed and placed in between two fixed polarizers set for maximum transmission.
Claim 10
Dependent Claim
24 words
The device of claim 1 wherein said measuring means consists essentially of two photomultiplier tubes, a tracking filter and a digital phase shift meter.
Claim 11
Dependent Claim
21 words
The device of claim 9 wherein said crystalline material is directly attached to the face of one of said photomultiplier tubes.
References Cited (Backward Citations)
US3052405A
Cited
US3175093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |