Patent US4094608A successfully refreshed from Google Patents.
US4094608A
Expired / Lapsed
US
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Spectrometer of the electro-opto-acoustic type with capacitor-type detection
Assignee: ELSCINT IMAGING Inc
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Filing: 1976-10-14
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Granted: 1978-06-13
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Expires: 1996-10-14
Abstract
Abstract A spectrometer generally of the electro-opto-acoustic type, using a capacitor type detection instead of acoustic detection. A holder with a sample carrier having a dielectric and with a conducting backing plate on one surface of the sample carrier and a transparent conducting coating and an electrical potential on the opposite surface, with the potential applied after sample accumulation. A source for directing a beam of radiation onto the sample for cyclically heating the sample and varying the spacing between the metal backing plate and conducting coating, and an ac detector circuit connected to the backing plate providing an ac signal varying with the spacing and hence with the composition of the sample.
Inventors
- 👤 Robert A. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/1702
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
84 words
In a spectrometer, the combination of: a holder having a conducting sheet with a sample carrier including an electrical insulator on said conducting sheet, a conducting layer on the surface of said sample carrier spaced from said sheet, and an electrical potential on said conducting layer; a radiation source providing a beam of radiation directed onto said sample carrier; and an ac detector circuit connected to said conducting sheet and providing an output varying as a function of the condition of said sample carrier.
Claim 2
Dependent Claim
84 words
In a spectrometer, the combination of: a holder having a conducting sheet with a sample carrier including an electrical insulator on said conducting sheet, a conducting layer on the surface of said sample carrier spaced from said sheet, and an electrical potential on said conducting layer; a radiation source providing a beam of radiation directed onto said sample carrier; and an ac detector circuit connected to said conducting sheet and providing an output varying as a function of the condition of said sample carrier.
Claim 3
Dependent Claim
22 words
The apparatus as defined in claim 1 wherein said electrical potential is provided by a dc source connected to said conducting layer.
Claim 4
Dependent Claim
23 words
The apparatus as defined in claim 1 wherein said electrical potential is provided by a plurality of electrostatic charges at said conducting layer.
Claim 5
Dependent Claim
41 words
The apparatus as defined in claim 3 wherein said conducting sheet of said holder is in two separate pieces electrically insulated from each other, with one piece connected to said ac detector circuit and the other piece connected to circuit ground.
Claim 6
Dependent Claim
26 words
The apparatus as defined in claim 1 including a heatsink, with said holder carried on said heatsink with said conducting sheet in engagement with said heatsink.
Claim 7
Dependent Claim
38 words
The apparatus as defined in claim 1 wherein said detector circuit includes a resistor and a capacitor connected in parallel between said conducting sheet and circuit ground, and an amplifier having its input connected to said conducting sheet.
Claim 8
Dependent Claim
33 words
The apparatus as defined in claim 6 wherein said detector circuit further includes a demodulator having the amplifier output connected as an input and providing a demodulated output signal for storage and/or recording.
Claim 9
Dependent Claim
27 words
The apparatus as defined in claim 1 including a beam splitter and a radiation detector positioned to receive radiation from said source scattered by said beam splitter.
Claim 10
Dependent Claim
23 words
The apparatus as defined in claim 8 including a computer having the radiation detector output and the ac detector circuit output as inputs.
Claim 11
Dependent Claim
16 words
The apparatus as defined in claim 1 including modulation means for modulating said beam of radiation.
Claim 12
Dependent Claim
25 words
The apparatus as defined in claim 1 including means for moving said beam relative to said holder for deflecting the beam across the sample carrier.
Claim 13
Dependent Claim
23 words
The apparatus as defined in claim 1 wherein the sample is carried in said electrical insulator on said conducting sheet of said holder.
Claim 14
Dependent Claim
27 words
The apparatus as defined in claim 1 wherein the sample is carried in a layer attached to said electrical insulator on said conducting sheet of said holder.
Claim 15
Dependent Claim
28 words
The apparatus as defined in claim 1 wherein said holder includes a retainer shell carried on said conducting sheet and defining a sample space over said electrical insulator.
Claim 16
Dependent Claim
29 words
The apparatus as defined in claim 1 wherein said sample carrier includes a material which reacts with a sample to produce a change in color of the sample carrier.
Claim 17
Dependent Claim
41 words
The apparatus as defined in claim 1 wherein said conducting sheet of said holder is in two separate pieces electrically insulated from each other, with one piece connected to said ac detector circuit and the other piece connected to circuit ground.
Claim 18
Dependent Claim
58 words
The apparatus as defined in claim 1 wherein a first portion of said sample carrier has been exposed to a sample and a second portion of said sample carrier has not been exposed to the sample, and including means for moving said beam relative to said holder for cyclically deflecting the beam onto said first and second portions.
Claim 19
Dependent Claim
24 words
The apparatus as defined in claim 17 including a known amount of a known constituent in said second portion for purposes of instrument calibration.
Claim 20
Dependent Claim
64 words
The apparatus as defined in claim 17 wherein said conducting sheet of said holder is in two separate pieces electrically insulated from each other, with one piece connected to said ac detector circuit and the other piece connected to circuit ground, and with said first portion of said sample carrier overlying one piece of said sheet and said second portion overlying the other piece.
Claim 21
Dependent Claim
24 words
The apparatus as defined in claim 1 including a known amount of a known constituent in said sample carrier for purposes of instrument calibration.
Claim 22
Dependent Claim
14 words
The apparatus as defined in claim 1 wherein said radiation source includes a laser.
Claim 23
Dependent Claim
14 words
The apparatus as defined in claim 1 wherein said radiation source includes a monochromator.
Claim 24
Independent Claim
86 words
A method of analyzing a sample including the steps of: collecting the sample in a sample carrier; providing a conducting backing sheet for one surface of the sample carrier; after collection of the sample providing an electrical potential on a conducting layer at the opposite surface of the sample carrier; directing a beam of radiation onto the sample to cyclically heat the sample and vary the spacing between the electrical potential and the backing sheet; and producing an ac signal varying with the variation in spacing.
Claim 25
Independent Claim
86 words
A method of analyzing a sample including the steps of: collecting the sample in a sample carrier; providing a conducting backing sheet for one surface of the sample carrier; after collection of the sample providing an electrical potential on a conducting layer at the opposite surface of the sample carrier; directing a beam of radiation onto the sample to cyclically heat the sample and vary the spacing between the electrical potential and the backing sheet; and producing an ac signal varying with the variation in spacing.
Claim 26
Dependent Claim
31 words
The method as defined in claim 23 including sensing radiation of the beam scattered by an element in the beam, and producing another signal varying with the intensity of the scattering.
Claim 27
Dependent Claim
16 words
The method as defined in claim 23 including producing the beam of radiation with a monochromator.
Claim 28
Dependent Claim
18 words
The method as defined in claim 23 including producing the beam of radiation with a substantially monochromatic laser.
Claim 29
Dependent Claim
14 words
The method as defined in claim 23 including amplitude modulating the beam of radiation.
Claim 30
Dependent Claim
14 words
The method as defined in claim 23 including wavelength modulating the beam of radiation.
Claim 31
Dependent Claim
16 words
The method as defined in claim 23 including cyclically moving the beam relative to the carrier.
Claim 32
Dependent Claim
38 words
The method as defined in claim 23 including collecting the sample in only a first portion of the sample carrier, and cyclically deflecting the beam of radiation onto the first portion and a second portion of the carrier.
Claim 33
Dependent Claim
29 words
The method as defined in claim 30 including introducing a known amount of a known constituent in the second portion of the sample carrier for purposes of instrument calibration.
Claim 34
Dependent Claim
25 words
The method as defined in claim 23 including introducing a known amount of a known constituent in the sample carrier for purposes of instrument calibration.
Claim 35
Dependent Claim
25 words
The method as defined in claim 23 including producing the electrical potential at the sample carrier by exposure to a source of positive electrostatic charges.
Claim 36
Dependent Claim
25 words
The method as defined in claim 23 including producing the electrical potential at the sample carrier by connecting the conducting layer to a dc source.
Claim 37
Dependent Claim
26 words
The method as defined in claim 23 wherein the sample is collected in a material which reacts with the sample to produce a change in color.
References Cited (Backward Citations)
US2870338A
Cited
US3493484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |