US3901599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analysis of pulverulent material using a laser beam subjected to variable refraction to produce pulses
Assignee: Centre dEtudes et de Recherches de lIndustrie des Liants Hydrauliques
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Filing: 1973-07-18
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Granted: 1975-08-26
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Expires: 1993-07-18
Abstract
Abstract The analysis is performed using a laser generator which is controlled, e.g. by a variable refractive index device, to cause a laser beam pulse to be emitted. The beam vaporizes some of the pulverulent material, the pulse being of a duration short enough to prevent fractional distillation of the pulverulent material. Light intensity measuring means are used to observe the relative intensities of spectral lines in the light emitted by the vaporized pulverulent material.
Inventors
- 👤 Jean Paul Meric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/718
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
Apparatus for the analysis of pulverulent material comprising; a laser generator for producing a laser beam to impinge on the pulverulent material for vaporizing some of the pulveralent material, said laser generator including a pair of opPosite end mirrors at least one of which is semi-transparent; variable means disposed between said mirrors in the path of the laser beam for producing short pulses of high intensity of said laser beam which achieve vaporization of the pulveralent material without fractional distillation, said variable means comprising a sealed housing containing a fluid and having ends which are transparent to the laser beam and means in said housing externally stimulated for producing standing pressure waves in the fluid accompanied by a refractive index gradient, and light intensity measuring means for observing the relative intensities of spectral lines in light emitted by the vaporized pulverulent material.
Claim 2
Dependent Claim
142 words
Apparatus for the analysis of pulverulent material comprising; a laser generator for producing a laser beam to impinge on the pulverulent material for vaporizing some of the pulveralent material, said laser generator including a pair of opPosite end mirrors at least one of which is semi-transparent; variable means disposed between said mirrors in the path of the laser beam for producing short pulses of high intensity of said laser beam which achieve vaporization of the pulveralent material without fractional distillation, said variable means comprising a sealed housing containing a fluid and having ends which are transparent to the laser beam and means in said housing externally stimulated for producing standing pressure waves in the fluid accompanied by a refractive index gradient, and light intensity measuring means for observing the relative intensities of spectral lines in light emitted by the vaporized pulverulent material.
Claim 3
Dependent Claim
37 words
Apparatus as recited in claim 1, wherein said variable means is operable cyclically such that the emission of the laser beam is for a period of time which is short relative to the period of cyclical variation.
Claim 4
Dependent Claim
37 words
Apparatus as recited in claim 1, wherein said wave producing means comprises a cylinder of piezo-electric material encircling the optical path, and, on the cylinder, electrodes connectable to an oscillatory voltage source for energizing the piezo-electric material.
Claim 5
Dependent Claim
20 words
Apparatus are recited in claim 1, wherein the light intensity measuring means comprises means for measuring substantially the whole spectrum.
Claim 6
Dependent Claim
43 words
Apparatus as recited in claim 1, wherein the light intensity measuring means comprises a diffraction grating for separating the frequency components of a spectrum, and a plurality of photomultipliers arranged to detect and measure the intensity of a respective plurality of the components.
Claim 7
Dependent Claim
27 words
Apparatus as recited in claim 5, wherein the measuring means also comprises means for measuring substantially the whole spectrum to provide a reference for the measuring means.
Claim 8
Dependent Claim
71 words
Apparatus as recited in claim 1, and additionally comprising a first container for containing pulverulent material, further containers, means for apportioning the material from the first container amongst the further containers, means for compacting the pulverulent material in the further containers, and means for conveying the further containers successively past the compacting means and past a station where the laser beam can impinge upon the pulverulent material contained in the container.
Claim 9
Dependent Claim
50 words
Apparatus as recited in claim 7, and additionally comprising means for synchronizing the operation of the apportioning means, the compacting means, the conveying means and the laser generator, so that the apportioning means, the compacting means and the laser generator operate only when further containers are respectively in predetermined positions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |