Patent US3590640A successfully refreshed from Google Patents.
US3590640A
Expired / Lapsed
US
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Holographic pressure sensor
Assignee: CHAIN LAKES RES CORP
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Filing: 1969-04-24
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Granted: 1971-07-06
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Expires: 1989-04-24
Abstract
Abstract A pressure sensor consisting essentially of a deformable diaphragm having a side subjected to the action of a fluid, liquid or gas, whose pressure is sought to be measured. The other side of the diaphragm is illuminated by an image of the diaphragm at rest which is reconstructed from a hologram. The interference of the light from the reconstructed hologram image of the diaphragm and the light reflected from the actual diaphragm creates interference fringes whose number and arrangement provide an indication of the pressure of the fluid. A detector, such as a photocell, is coupled to a meter for providing a visual quantitative information of the pressure of the fluid.
Inventors
- 👤 Ivan Cindrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:49
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0076; G01L9/0077; G01B; G01B9/00; G01B9/02; G01B9/021; Y; Y10; Y10S; Y10S359/00; Y10S359/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
In a fluid pressure sensor, a deformable diaphragm, means for subjecting a face of the diaphragm to a fluid under pressure so as to elastically deflect said diaphragm proportionally to the pressure of said fluid, a hologram of said diaphragm in its undistorted state, means for reconstructing an image of said diaphragm from said hologram and for projecting said image upon said deflected diaphragm so as to cause optical interference fringes to appear on said diaphragm wherein the uMber and arrangement of said fringes provide an indication of the pressure of said fluid.
Claim 2
Dependent Claim
93 words
In a fluid pressure sensor, a deformable diaphragm, means for subjecting a face of the diaphragm to a fluid under pressure so as to elastically deflect said diaphragm proportionally to the pressure of said fluid, a hologram of said diaphragm in its undistorted state, means for reconstructing an image of said diaphragm from said hologram and for projecting said image upon said deflected diaphragm so as to cause optical interference fringes to appear on said diaphragm wherein the uMber and arrangement of said fringes provide an indication of the pressure of said fluid.
Claim 3
Dependent Claim
31 words
The fluid pressure sensor of claim 1 further comprising detector means supplying an output signal as a function of the number of said fringes in a predetermined area of said diaphragm.
Claim 4
Dependent Claim
30 words
The fluid pressure sensor of claim 1 further comprising detector means supplying an output signal as a function of the average light reflected by a predetermined area of said diaphragm.
Claim 5
Dependent Claim
17 words
The fluid pressure sensor of claim 2 wherein said output signal is converted in units of pressure.
Claim 6
Dependent Claim
17 words
The fluid pressure sensor of claim 3 wherein said output signal is converted in units of pressure.
Claim 7
Independent Claim
80 words
A method for measuring the pressure of a fluid comprising subjecting a face of a diaphragm to fluid under pressure so as to elastically deflect said diaphragm proportionally to the pressure of said fluid, and projecting on said diaphragm a reconstructed image from a hologram of said diaphragm in its undistorted state so as to cause interference fringes to appear on said diaphragm, wherein the number and arrangement of said fringes provides an indication of the pressure of said fluid.
Claim 8
Independent Claim
80 words
A method for measuring the pressure of a fluid comprising subjecting a face of a diaphragm to fluid under pressure so as to elastically deflect said diaphragm proportionally to the pressure of said fluid, and projecting on said diaphragm a reconstructed image from a hologram of said diaphragm in its undistorted state so as to cause interference fringes to appear on said diaphragm, wherein the number and arrangement of said fringes provides an indication of the pressure of said fluid.
Claim 9
Dependent Claim
20 words
The method of claim 6 further comprising counting the number of said fringes in a predetermined area of said diaphragm.
Claim 10
Dependent Claim
19 words
The method of claim 6 further comprising detecting the average light reflected by a predetermined area of said diaphragm.
Claim 11
Dependent Claim
14 words
The method of claim 7 wherein said counting is converted in units of pressure.
Claim 12
Dependent Claim
15 words
The method of claim 8 wherein said average light is converted in units of pressure.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |