US4041313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emittance calorimetric method
Assignee: United States Department of the Navy
•
Filing: 1975-11-03
•
Granted: 1977-08-09
•
Expires: 1995-11-03
Abstract
Abstract A precise measurement of the absorption of weakly absorbing optical mater is measured by measuring the temperature rise of the sample when light of the wavelength of interest passes through it. The temperature rise is determined by measuring the emission from the sample due to phonon absorption processes. This emission is of a much longer wavelength than the wavelength of interest. The temperature rise is measured by measuring the rate of increase of the emitted radiation power from the sample at the longer wavelength.
Inventors
- 👤 Roy F. Potter
- 👤 Donald L. Stierwalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:21
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/171
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A method of making a precise measurement of the absorption of weakly absorbing optical materials by measuring the temperature rise of the sample when light of the wavelength of interest passes through said sample, comprising the steps of: a. passing light of a first predetermined wavelength through a sample of the weakly absorbing material; b. measuring the rate of increase in power emitted by said sample at a second predetermined wavelength.
Claim 2
Independent Claim
71 words
A method of making a precise measurement of the absorption of weakly absorbing optical materials by measuring the temperature rise of the sample when light of the wavelength of interest passes through said sample, comprising the steps of: a. passing light of a first predetermined wavelength through a sample of the weakly absorbing material; b. measuring the rate of increase in power emitted by said sample at a second predetermined wavelength.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein said measuring step further comprises the step of filtering the emission radiated from said sample to allow only energy in the spectral region where the sample is a strong emitter.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein the first predetermined wavelength is in the spectrum of light emitted from a laser source.
Claim 5
Dependent Claim
15 words
The method of claim 3 wherein the second predetermined wavelength is in the infrared spectrum.
Claim 6
Dependent Claim
38 words
The method of claim 4 wherein said measuring step further includes the step of detecting the temperature rise of said sample by detecting the rate of increase in power emitted by the sample in the infrared spectral region.
Claim 7
Independent Claim
85 words
A method of measuring the absorption of weakly absorbing optical materials the steps comprising: a. passing a light of a first predetermined wavelength through the sample to cause said sample to increase the amount of energy emitted due to a rise in temperature; b. focusing and filtering the emission of said sample to exclude all radiation other than the energy emitted at a second predetermined wavelength; c. measuring the rate of increase of the emitted radiation power from said sample at said second predetermined wavelength.
Claim 8
Independent Claim
85 words
A method of measuring the absorption of weakly absorbing optical materials the steps comprising: a. passing a light of a first predetermined wavelength through the sample to cause said sample to increase the amount of energy emitted due to a rise in temperature; b. focusing and filtering the emission of said sample to exclude all radiation other than the energy emitted at a second predetermined wavelength; c. measuring the rate of increase of the emitted radiation power from said sample at said second predetermined wavelength.
Claim 9
Dependent Claim
20 words
The method as recited in claim 6 wherein said first predetermined wavelength is in the spectral region of laser emittance.
Claim 10
Dependent Claim
18 words
The method as recited in claim 7 wherein said second predetermined wavelength is in the infrared spectral region.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |