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US4475816A
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Method for determining in situ the absorption coefficient of particulate media using pulsed laser technique
Assignee: United States Department of the Navy
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Filing: 1980-02-15
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Granted: 1984-10-09
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Expires: 2000-02-15
Abstract
Abstract A true indication of a fluid's absorption coefficient takes into effect the contributing factors of absorption and particle multiple scattering. A pulsed optical source transmits radiation through a relatively large volume of a certain particulate fluid medium. A detector or irradiance meter is gated so as to provide waveforms on a monitor which are characteristic of the absorption and multiple scattering of the medium. Using the transmittance and multiple line spread of the received signal a nearly real-time in situ analysis can be performed to provide scientists, communications specialists, etc. with the capability to anticipate operational parameters.
Inventors
- 👤 Gregory C. Mooradian
- 👤 Larry B. Stotts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:12
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A method for determining in situ the true absorption coefficient of a particulate media comprising: pulsing a beam of optical radiation through a wide path in the particulate medium; locating a radiation detector to receive the radiation at the end of the wide path; actuating the detector for predetermined intervals to pass signals each representative of both the absorption and particulate multiple scattering of the particulate media as the beam passes therethrough; and monitoring the magnitudes of the representative signals by comparing the representative signals to known values to determine the absorption coefficient.
Claim 2
Independent Claim
93 words
A method for determining in situ the true absorption coefficient of a particulate media comprising: pulsing a beam of optical radiation through a wide path in the particulate medium; locating a radiation detector to receive the radiation at the end of the wide path; actuating the detector for predetermined intervals to pass signals each representative of both the absorption and particulate multiple scattering of the particulate media as the beam passes therethrough; and monitoring the magnitudes of the representative signals by comparing the representative signals to known values to determine the absorption coefficient.
Claim 3
Independent Claim
109 words
A method for determining in situ the true absorption coefficient of a particulate media comprising: pulsing a beam of optical radiation through a wide path in the particulate medium, the step of pulsing includes the diffusing of the beam for radiation through the particulate media; locating a radiation detector to receive the radiation at the end of the wide path; actuating the detector for predetermined intervals to pass signals each representative of both the absorption and particulate multiple scattering of the particulate media as the beam passes therethrough; and monitoring the magnitudes of the representative signals by comparing the representative signals to known values to determine the absorption coefficient.
Claim 4
Independent Claim
109 words
A method for determining in situ the true absorption coefficient of a particulate media comprising: pulsing a beam of optical radiation through a wide path in the particulate medium, the step of pulsing includes the diffusing of the beam for radiation through the particulate media; locating a radiation detector to receive the radiation at the end of the wide path; actuating the detector for predetermined intervals to pass signals each representative of both the absorption and particulate multiple scattering of the particulate media as the beam passes therethrough; and monitoring the magnitudes of the representative signals by comparing the representative signals to known values to determine the absorption coefficient.
References Cited (Backward Citations)
US3519354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |