US5313065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optic radiation monitor
Assignee: McDermott Technology Inc
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Filing: 1992-09-01
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Granted: 1994-05-17
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Expires: 2012-09-01
Abstract
Abstract Scintillating optical fiber is used in a probe for detecting radiation. The scintillating optical fiber is fused to an extension fiber leading to optoelectronics such as p-intrinsic n-photodiodes or avalanche photodiodes. The fibers are housed in a durable probe body for penetration into the ground. When radiation is present, dopants in the scintillating fiber emit visible light through the extension fiber to the optoelectronics. Amplifiers are provided for monitoring the light intensity transmitted along the fibers and for triggering an alarm circuit signaling the presence of radiation at the probe.
Inventors
- 👤 Stuart E. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:12
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/201; G01T1/2008; G01T1/203
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A sensor for detecting the presence of underground radiation, comprising: a probe for penetrating an underground area of possible radiation; a scintillating optical fiber housed within the probe for emitting light when exposed to radiation at the underground area, said scintillating optical fiber having a plurality of sections housed within the probe, each section of the scintillating optical fiber emitting a different wavelength corresponding to a selected radiation, said probe being provided with a plurality of windows such that each window is aligned with a corresponding section of the scintillating optical fiber, said windows providing energy discrimination; a non-scintillating extension fiber having one end connected to the scintillating optical fiber for passing light emitted by the scintillating optical fiber; photodetection means operatively connected to an opposite end of the extension fiber for receiving emitted light originating from the scintillating optical fiber and passed through the extension fiber, the photodetection means being for converting the light into a signal; and electronic means for receiving the signal from the photodetection means and for indicating the presence of radiation at the underground area.
Claim 2
Dependent Claim
180 words
A sensor for detecting the presence of underground radiation, comprising: a probe for penetrating an underground area of possible radiation; a scintillating optical fiber housed within the probe for emitting light when exposed to radiation at the underground area, said scintillating optical fiber having a plurality of sections housed within the probe, each section of the scintillating optical fiber emitting a different wavelength corresponding to a selected radiation, said probe being provided with a plurality of windows such that each window is aligned with a corresponding section of the scintillating optical fiber, said windows providing energy discrimination; a non-scintillating extension fiber having one end connected to the scintillating optical fiber for passing light emitted by the scintillating optical fiber; photodetection means operatively connected to an opposite end of the extension fiber for receiving emitted light originating from the scintillating optical fiber and passed through the extension fiber, the photodetection means being for converting the light into a signal; and electronic means for receiving the signal from the photodetection means and for indicating the presence of radiation at the underground area.
Claim 3
Dependent Claim
14 words
The sensor according to claim 1, wherein the photodetection means comprises a p-intrinsic-n photodiode.
Claim 4
Dependent Claim
14 words
The sensor according to claim 1, wherein the photodetection means comprises an avalanche photodiode.
Claim 5
Dependent Claim
34 words
The sensor according to claim 1, wherein the probe has a top and a bottom, the top located at the extension fiber, the bottom located at an opposite end of the scintillating optical fiber.
Claim 6
Dependent Claim
64 words
The sensor according to claim 1, wherein each section of the scintillating optical fiber is arranged in order of increasing emitting wavelength such that the section with the shortest emitting wavelength is positioned at an end of the probe nearest the extension fiber and the section with the longest emitting wavelength is positioned at an end of the probe furthest from the extension fiber.
Claim 7
Dependent Claim
57 words
The sensor according to claim 5, wherein a dichroic mirror is provided between each section of the scintillating optical fiber, each dichroic mirror having spectral characteristics such that it reflects the wavelength emitted by the adjacent section nearer to the extension fiber and passes the longer wavelength emitted by the adjacent section further from the extension fiber.
Claim 8
Dependent Claim
35 words
The sensor according to claim 1, including light dispersive means connected to the extension fiber for receiving various emitted wavelengths of light and for dispersing each emitted wavelength of light to a corresponding photodetection means.
References Cited (Backward Citations)
US4267446A
Cited
US4361765A
Cited
US4598202A
Cited
GB2163252A
Cited
US4788436A
Cited
JPS63307382A
Cited
JPH0274890A
Cited
US4931646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |