Patent US2786794A successfully refreshed from Google Patents.
US3590255A
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US
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Analysis system
Assignee: THERMO JARRELL ASH Corp WALTHAM MA A CORP OF
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Filing: 1969-02-28
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Granted: 1971-06-29
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Expires: 1989-02-28
Abstract
Abstract An analysis system includes an analysis cell and a radiation source which generates a characteristic radiation. An optical system passes radiation from the source along a first path through the analysis cell for sensing by a sensor and passes radiation from the source along a second path outside of the analysis cell, for sensing by a second sensor. An optical modulator channels the radiation in each path alternately to the sensors so that each sensor alternately produces an output proportional to the radiation from the corresponding source in each path and means responsive to the optical modulator provides an accurately predetermined portion of the output signal from each sensor in each cycle of the optical modulator.
Inventors
- 👤 Stanley B Smith Jr
- 👤 James E Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:22
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/3103
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
166 words
A spectoranalysis system comprising an analysis cell, two radiation sources, each said source generating a characteristic radiation, two radiation sensors, an optical system for passing radiation from each source along a first path through said analysis cell for sensing by said sensors and passing radiation from each source along a second path outside of said analysis cell for sensing by each of said sensors, an optical modulator for channeling radiation energy from said sources in each of said first and second paths alternately to said sensors so that each sensor alternately produces an output proportional to the radiation from the corresponding source in each said first and second paths, means responsive to said optical modulator for providing and accurately predetermined portion of the output signal from each sensor in each cycle of said optical modulator and circuitry responsive to the outputs of said sensors for establishing a signal ratio as a function of the effect of said analysis cell on the radiation from said radiation sources.
Claim 2
Dependent Claim
166 words
A spectoranalysis system comprising an analysis cell, two radiation sources, each said source generating a characteristic radiation, two radiation sensors, an optical system for passing radiation from each source along a first path through said analysis cell for sensing by said sensors and passing radiation from each source along a second path outside of said analysis cell for sensing by each of said sensors, an optical modulator for channeling radiation energy from said sources in each of said first and second paths alternately to said sensors so that each sensor alternately produces an output proportional to the radiation from the corresponding source in each said first and second paths, means responsive to said optical modulator for providing and accurately predetermined portion of the output signal from each sensor in each cycle of said optical modulator and circuitry responsive to the outputs of said sensors for establishing a signal ratio as a function of the effect of said analysis cell on the radiation from said radiation sources.
Claim 3
Dependent Claim
73 words
The system as claimed in claim 1 wherein said optical modulator is a rotatable chopper device disposed between said cell and said sensors, said chopper device including two opposed reflecting surfaces for concurrently reflecting radiation in said first and second paths to said sensors in a first position of said chopper device, the radiation in said first and second paths passing diRectly to opposite sensors in a second position of said chopper device.
Claim 4
Dependent Claim
19 words
The system as claimed in claim 1 wherein said optical modulator is disposed between said cell and said sensors.
Claim 5
Dependent Claim
132 words
The system as claimed in claim 1 wherein said circuitry includes a source of clock pulses, a counter responsive to said clock pulses and said optical modulator responsive means, and circuitry responsive to said counter for gating the output signals from said sensors during a time interval corresponding to a predetermined number of clock pulses during each cycle of said modulator. 5 The analysis system as claimed in claim 1 wherein said optical modulator is a rotatable chopper device that includes an opaque chopping member and said optical modulator responsive means includes a light source and a light sensor, said light source being disposed on one side of the path of said chopping member and said light sensor being disposed on the other side of said chopping member opposite said light source.
Claim 6
Dependent Claim
76 words
The analysis system as claimed in claim 5 wherein said optical modulator responsive means further includes means for biasing said light sensor for linear operation, a switching circuit arranged for switching at a predetermined point in each transition in the output of said light sensor produced by said modulator and capacitive coupling between said light sensor and said switching circuit for coupling the AC component of the output of said light sensor to said switching circuit.
Claim 7
Dependent Claim
32 words
The analysis system as claimed in claim 6 wherein said light sensor is a photosensitive field effect transistor and said switching circuit includes a matched pair of transistors connected in differential arrangement.
Claim 8
Dependent Claim
49 words
The analysis system as claimed in claim 1 and further including pulse source means for pulsing each said radiation source at a unique rate and wherein said sensor output responsive circuitry includes a filter network having a pass band corresponding to the pulsed rate of its associated radiation source.
Claim 9
Dependent Claim
31 words
The analysis system as claimed in claim 8 wherein said sensor output responsive means includes demodulation circuitry responsive to the output of said filter network and to said pulse source means.
Claim 10
Dependent Claim
81 words
The analysis system as claimed in claim 9 wherein said demodulation circuitry comprises four solid state switching devices arranged in bridge configuration, each switching device of a first pair being of NPN configuration and each switching device of the second pair being of PNP configuration, the output circuits of one pair of switching devices being connected to a reference terminal and the output circuits of the other pair of switching devices being connected to the output terminal of the demodulation circuitry.
Claim 11
Dependent Claim
51 words
The analysis system as claimed in claim 9 wherein said modulator responsive means includes gating means responsive to said pulse source means for providing a gating interval to pass an accurately predetermined portion of the output of said demodulation circuitry in each cycle of said modulator for establishing said signal ratio.
Claim 12
Dependent Claim
62 words
The system as claimed in claim 11 wherein said gating means includes a source of clock pulses, a counter responsive to said clock pulses and said optical modulator responsive, means, and circuitry responsive to said counter for gating the output signals from said sensors during a time interval corresponding to a predetermined number of clock pulses during each cycle of said modulator.
Claim 13
Dependent Claim
48 words
The analysis system as claimed in claim 12 wherein said gating circuitry includes a light source and a light sensor, said light source being disposed on one side of said modulator and said light sensor being disposed on the other side of said modulator opposite said light source.
Claim 14
Dependent Claim
76 words
The analysis system as claimed in claim 12 wherein said gating circuitry further includes a modulator sensor means for biasing said modulator sensor for linear operation, a switching circuit arranged for switching at a predetermined point in each transition in the output of said modulator sensor produced by said modulator and capacitive coupling between said modulator sensor and said switching circuit for the AC component of the output of said modulator sensor to said switching circuit.
Claim 15
Dependent Claim
32 words
The analysis system as claimed in claim 14 wherein said modulator sensor is a photosensitive field effect transistor and said switching circuit includes a matched pair of transistors connected in differential arrangement.
Claim 16
Dependent Claim
70 words
A synchronous demodulator circuit comprising four solid state switching devices arranged in bridge configuration, each switching device of a first pair being of NPN configuration and each switching device of the second pair being of PNP configuration, the output circuits of one pair of switching devices being connected to a reference terminal and the output circuits of the other pair of switching devices being connected to the demodulator output terminal.
Claim 17
Dependent Claim
70 words
A synchronous demodulator circuit comprising four solid state switching devices arranged in bridge configuration, each switching device of a first pair being of NPN configuration and each switching device of the second pair being of PNP configuration, the output circuits of one pair of switching devices being connected to a reference terminal and the output circuits of the other pair of switching devices being connected to the demodulator output terminal.
Claim 18
Dependent Claim
109 words
In an analysis system which includes an optical modulator for periodically channeling radiation to a radiation sensor which radiation sensor produces an electrical output as a function of the radiation impinging on said sensor, control circuitry including a modulator sensor for producing an output in synchronism with the cyclical modulation of radiation to said radiation sensor, a source of clock pulses, a counter responsive to said clock pulses and to the output of said modulator sensor, and circuitry responsive to said counter for gating the output signal from said radiation sensor during a time interval corresponding to a predetermined number of clock pulses during each cycle of said modulator.
Claim 19
Dependent Claim
109 words
In an analysis system which includes an optical modulator for periodically channeling radiation to a radiation sensor which radiation sensor produces an electrical output as a function of the radiation impinging on said sensor, control circuitry including a modulator sensor for producing an output in synchronism with the cyclical modulation of radiation to said radiation sensor, a source of clock pulses, a counter responsive to said clock pulses and to the output of said modulator sensor, and circuitry responsive to said counter for gating the output signal from said radiation sensor during a time interval corresponding to a predetermined number of clock pulses during each cycle of said modulator.
Claim 20
Dependent Claim
71 words
The analysis system as claimed in claim 17 and further including means for biasing said modulator sensor for linear operation, a switching circuit arranged for switching at a predetermined point in each transition in the output of said modulator sensor produced by said modulator, and capacitive coupling between said modulator sensor and said switching circuit for coupling the AC component of the output of said modulator sensor to said switching circuit.
Claim 21
Dependent Claim
32 words
The analysis system as claimed in claim 18 wherein said modulator sensor is a photosensitive field effect transistor and said switching circuit includes a matched pair of transistors connected in differential arrangement.
Claim 22
Dependent Claim
147 words
In an analysis system which includes an optical modulator for periodically channeling radiation to a radiation sensor which radiation sensor produces an electrical output as a function of the radiation impinging on said sensor, control circuitry including a modulator sensor for producing an output in synchronism with the cyclical modulation of radiation to said radiation sensor, means for biasing said light sensor for linear operation, a switching circuit arranged for switching at a predetermined point in each transition in the output of said light sensor produced by said modulator and capacitive coupling between said light sensor and said switching circuit for coupling the AC component of the output of said light sensor to said switching circuit, and circuitry responsive to the output of said modulator sensor for gating the output signal from said radiation sensor at a rate corresponding to the cyclical operation of said optical modulator.
Claim 23
Dependent Claim
147 words
In an analysis system which includes an optical modulator for periodically channeling radiation to a radiation sensor which radiation sensor produces an electrical output as a function of the radiation impinging on said sensor, control circuitry including a modulator sensor for producing an output in synchronism with the cyclical modulation of radiation to said radiation sensor, means for biasing said light sensor for linear operation, a switching circuit arranged for switching at a predetermined point in each transition in the output of said light sensor produced by said modulator and capacitive coupling between said light sensor and said switching circuit for coupling the AC component of the output of said light sensor to said switching circuit, and circuitry responsive to the output of said modulator sensor for gating the output signal from said radiation sensor at a rate corresponding to the cyclical operation of said optical modulator.
References Cited (Backward Citations)
US3137758A
Cited
US3415998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |