Patent US3795918A successfully refreshed from Google Patents.
US3795918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic ratio instrument for remote temperature measurement
Assignee: Mirion Technologies Capintec Inc
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Filing: 1972-01-31
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Granted: 1974-03-05
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Expires: 1992-01-31
Abstract
Abstract An all electronic instrument for non-contact temperature measurement independent of target emissivity based on measuring the ratio of light energy in two adjacent spectral bands by means of a reference light cell and a measurement light cell switchably connected to a common amplifier chain provided with electronic gain control servoed by the resultant output of the reference light cell.
Inventors
- 👤 J Sunderland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:45
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
239 words
An instrument for remotely measuring the unknown temperature of a target, said instrument comprising: optical means for receiving continuous light energy being emitted by said target over an unbroken range of frequencies, and for separating said light energy into two predetermined wave lengths; first and second means operatively located for receiving said light energy and for substantially linearly converting said light energy into electrical energy; first amplifier means including AGC means for controlling the output thereof; second amplifier means including a feedback loop and an AGC means for controlling the output thereof; third amplifier means including an energy reference and feedback circuit for generating an output signal to control the AGC means of said first and second amplifier means; fourth amplifier means including an output zero and gain adjustment circuit; two position switching means operatively coupling said first and second amplifier means in circuit selectively with said first means and said third amplifier means to generate the AGC control signal and said second means and said fourth amplifier means to generate by said sequence of switching an output signal indicative of the temperature of the unknown target based on the ratio of energy emitted at said two predetermined wave lengths; means coupling the output of said third amplifier means with the AGC means of said first and second amplifier means; and means receiving the output from said fourth amplifier means for indicating the said temperature of the unknown target.
Claim 2
Dependent Claim
239 words
An instrument for remotely measuring the unknown temperature of a target, said instrument comprising: optical means for receiving continuous light energy being emitted by said target over an unbroken range of frequencies, and for separating said light energy into two predetermined wave lengths; first and second means operatively located for receiving said light energy and for substantially linearly converting said light energy into electrical energy; first amplifier means including AGC means for controlling the output thereof; second amplifier means including a feedback loop and an AGC means for controlling the output thereof; third amplifier means including an energy reference and feedback circuit for generating an output signal to control the AGC means of said first and second amplifier means; fourth amplifier means including an output zero and gain adjustment circuit; two position switching means operatively coupling said first and second amplifier means in circuit selectively with said first means and said third amplifier means to generate the AGC control signal and said second means and said fourth amplifier means to generate by said sequence of switching an output signal indicative of the temperature of the unknown target based on the ratio of energy emitted at said two predetermined wave lengths; means coupling the output of said third amplifier means with the AGC means of said first and second amplifier means; and means receiving the output from said fourth amplifier means for indicating the said temperature of the unknown target.
Claim 3
Dependent Claim
23 words
An instrument as in claim 1 wherein said first and second converting means each includes a large surface area, light sensiTive silicon diode.
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |