US3659941A
Expired / Lapsed
US
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Infra-red spectrometers
Assignee: Cameca SAS
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Filing: 1970-07-09
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Granted: 1972-05-02
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Expires: 1990-07-09
Abstract
Abstract In a two-channel spectrometer, the output signal of the opticoelectrical detector is integrated, while one of the two channels is illuminated, for a duration To at the end of which the integrated signals reaches a value E, one of the two values To and E being predetermined; the output signal of the detector is thereafter integrated, while the other channel is illuminated, for a duration T1 at the end of which the integrated signal reaches the aforesaid value E; T1/To is the transmission coefficient of the first channel relatively to the other one, and a signal function of T1/To is applied to the recorder.
Inventors
- 👤 Mathias Tong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:32
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/30; G01J3/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
319 words
An infra-red spectrometer comprising: a source of radiation for supplying a beam; an optico-electrical receiver having an output, for supplying an electrical signal which is a function of the intensity of the radiation received by said receiver; a sample channel for receiving a sample and a reference channel; optical switching means, having two states, for optically coupling, selectively through said sample channel or through said reference channel, said source to said receiver; a wavelength selector located for operating a wavelength selection on the beam directed from said source to said receiver for both states of said switching means; measurement means for successively (i) setting said optical switching means to one of its states referred to as its first state, for coupling said source to said receiver through one of said channels, referred to as the first measurement channel; (ii) integrating the output signal from said receiver for a duration To at the end of which the integrated signal reaches a value E, one of the two quantifies To and E being predetermined, and generating and storing a signal representative of the other one of said two quantities; (iii) setting said optical switching means to its other state, referred to as its second state, for coupling said source to said receiver through the other one of said channels, referred to as the second measurement channel, and (iiii) integrating the output signal from said receiver for the duration T1 at the end of which the corresponding integrated signal has reached said value E, and generating a signal proportional to said duration T1; a recorder having first and second inputs; means for applying to said first input of said recorder a signal which is a function of the wavelength selected by said wavelength selector; and further means coupled to said measurement means, for supplying said second input of said recorder with a signal which is a predetermined function of the ratio T1/To.
Claim 2
Dependent Claim
319 words
An infra-red spectrometer comprising: a source of radiation for supplying a beam; an optico-electrical receiver having an output, for supplying an electrical signal which is a function of the intensity of the radiation received by said receiver; a sample channel for receiving a sample and a reference channel; optical switching means, having two states, for optically coupling, selectively through said sample channel or through said reference channel, said source to said receiver; a wavelength selector located for operating a wavelength selection on the beam directed from said source to said receiver for both states of said switching means; measurement means for successively (i) setting said optical switching means to one of its states referred to as its first state, for coupling said source to said receiver through one of said channels, referred to as the first measurement channel; (ii) integrating the output signal from said receiver for a duration To at the end of which the integrated signal reaches a value E, one of the two quantifies To and E being predetermined, and generating and storing a signal representative of the other one of said two quantities; (iii) setting said optical switching means to its other state, referred to as its second state, for coupling said source to said receiver through the other one of said channels, referred to as the second measurement channel, and (iiii) integrating the output signal from said receiver for the duration T1 at the end of which the corresponding integrated signal has reached said value E, and generating a signal proportional to said duration T1; a recorder having first and second inputs; means for applying to said first input of said recorder a signal which is a function of the wavelength selected by said wavelength selector; and further means coupled to said measurement means, for supplying said second input of said recorder with a signal which is a predetermined function of the ratio T1/To.
Claim 3
Dependent Claim
182 words
A spectrometer as claimed in claim 1, wherein, E being the predetermined quantity, said measurement means comprises a two-position integrator having an integration input coupled to the output of said receiver, said integrator having a measurement position in which it integrates the signal applied to its integration input and a storage positiOn; first and second two-position time-measuring devices, respectively associated with said first and second measurement channels, each of said time-measurement devices having a measurement position in which it delivers an electrical signal which is a function of the time elapsed since it was placed in this position and a storage position; means for simultaneously placing in the measurement position said integrator and said first time-measurement device, and for placing said last-mentioned device in the storage position when the output signal from said integrator has reached said value E; means for resetting to zero said integrator; means for simultaneously placing in the measurement position said integrator and said second time-measurement device, and placing said latter device in the storage position when the output signal from said integrator has reached said value E.
Claim 4
Dependent Claim
64 words
A spectrometer as claimed in claim 2, wherein each of said two time-measurement devices is constituted by a two-position integrator having an integration input and having a measurement position in which it integrates the signal applied to its integration input and a storage position and means for supplying said input of this integrator with a constant voltage while it is in the measurement position.
Claim 5
Dependent Claim
219 words
An infra-red spectrometer, as claimed in claim 3, wherein said means for supplying the integration input of the integrator forming part of said second time-measurement device comprises: a constant voltage source; first and second further two-position integrators, said further integrators having respective integration inputs and respective outputs, each of said further two-position integrators having a measurement position in which it integrates the signal applied to its integration input and a storage position, said integration input of said first further integrator being coupled to said output of said integrator forming part of said first time-measurement device, said integration input of said second further integrator being coupled to said constant voltage source, and said output of said second further integrator being coupled to the integration input of said integrator forming part of said second time-measurement device; means for simultaneously placing in the measurement position said first and second further integrators while said first time-measurement device is in the storage position; and means for placing said second further integrator in the storage position when the integrated signal from said first further integrator has reached a predetermined value, for supplying said integration input of said integrator forming part of said second time-measurement device when the latter is in the measurement position; whereby this last mentioned device directly supplies a signal proportional to T1/To.
Claim 6
Dependent Claim
178 words
An infra-red spectrometer as claimed in claim 1, wherein, To being the predetermined quantity, said measurement means comprises: first and second two-position integrators having respective integration inputs, each of said integrators having a measurement position in which it integrates the signal applied to its integration input and a storage position; a switch for coupling said output of said receiver selectively to said integration input of said first integrator or to said integration input of said second integrator; a two-position time measurement device having a measurement position in which it delivers an electrical signal which is a function of the time elapsed since it was placed in this position and a storage position; means for setting said first integrator to its measurement position for a predetermined duration To, and thereafter to its storage position; means for simultaneously setting said second integrator and said time measurement device to their respective measurement positions and means for setting said time measurement device to its storage position upon the output signal of said second integrator reaching the value stored in said first integrator.
References Cited (Backward Citations)
US3102921A
Cited
US3428401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |