US3578864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor stress transducer
Assignee: IMO Industries Inc
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Filing: 1968-09-16
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Granted: 1971-05-18
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Expires: 1988-09-16
Abstract
Abstract A semiconductor stress transducer in which a coherent light beam from a semiconductor diode laser is photomixed with the light beam from a control semiconductor diode laser. Means are provided for detecting a difference in frequencies of the light beams. The detecting means senses optical heterodyning or homodyning of the photomixed beams and indicates the magnitude of the frequency differential as a measure of stress applied to the transducer.
Inventors
- 👤 Bernd Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:15
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/0607; G; G01; G01B; G01B11/00; G01B11/16; G02; G02F; G02F2/00; G02F2/002; H01S5/062; H01S5/06209; H01S5/0622
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
The transducer of claim 1, wherein said detecting means includes means for photomixing said first and second light beams and means for sensing optical heterodyning or homodyning of said photomixed beams.
Claim 2
Dependent Claim
30 words
The transducer of claim 1 wherein the wavelengths of said first and second light beams are substantially the same in the absence of applied stress on said first diode laser.
Claim 3
Dependent Claim
18 words
The transducer of claim 1, wherein said second diode laser is disposed proximate to said first diode laser.
Claim 4
Dependent Claim
27 words
The transducer of claim 1, wherein said detecting means is responsive to said difference in frequencies of said light beams to indicate the magnitude of said difference.
Claim 5
Dependent Claim
35 words
The transducer of claim 1, wherein said detecting means comprises: a semiconductor diode sensor that yields a signal in response to pulsed impingement of light thereon; and means to indicate the magnitude of said signal.
Claim 6
Dependent Claim
46 words
The transducer of claim 1, wherein said sensing means comprises: means for photomixing said first and second light beams; means for generating a signal in response to impingement of heterodyne or homodyne light pulses of said photomixed beams; and means indicating the magnitude of said signal.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |