US3670570A
Expired / Lapsed
US
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Light intensity calorimeter
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1971-04-30
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Granted: 1972-06-20
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Expires: 1991-04-30
Abstract
Abstract A calorimeter for measuring high-energy pulsed laser light. The light is absorbed by a suitable liquid which causes a molecular expansion. The liquid may be permitted to expand and the change of volume may be measured by a capillary tube. Alternatively, if the liquid is not permitted to expand, the rising pressure may be measured. This obviates the usual waiting period needed for a temperature equilibrium to be reached in conventional calorimeters.
Inventors
- 👤 Robert A Briones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:46
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/003; G01J; G01J5/00; G01J5/38; G01J5/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A radiant energy calorimeter comprising: a. a closed container containing a radiant energy absorbing liquid having a substantial molecular expansion upon absorption of heat due to radiant energy; b. a source of radiant energy impinging on the liquid in said container for imparting pulsed radiant energy thereto, thereby to increase the pressure of the liquid; and c. a pressure transducer communicating with the interior of said container for measuring the pressure increase caused by the molecular expansion imparted to the liquid by the pulsed energy of said rAdiant source.
Claim 2
Dependent Claim
89 words
A radiant energy calorimeter comprising: a. a closed container containing a radiant energy absorbing liquid having a substantial molecular expansion upon absorption of heat due to radiant energy; b. a source of radiant energy impinging on the liquid in said container for imparting pulsed radiant energy thereto, thereby to increase the pressure of the liquid; and c. a pressure transducer communicating with the interior of said container for measuring the pressure increase caused by the molecular expansion imparted to the liquid by the pulsed energy of said rAdiant source.
Claim 3
Dependent Claim
24 words
A light energy calorimeter as defined in claim 1 which further comprises a dye mixed with said liquid to increase the light absorption thereof.
Claim 4
Dependent Claim
49 words
A light energy calorimeter as defined in claim 1 wherein means are provided for imparting a known amount of energy to said liquid and including a heating element disposed in said container and means for supplying thereto a pulse of known electric energy so as to calibrate said calorimeter.
Claim 5
Dependent Claim
33 words
A light calorimeter as defined in claim 1 wherein said vessel is coated at least partially with a light reflecting material, thereby to minimize reradiation of the light energy absorbed by said liquid.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |