US3719076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the holographic analysis of oscillating objects
Assignee: BBC Brown Boveri AG Switzerland
•
Filing: 1971-06-23
•
Granted: 1973-03-06
•
Expires: 1991-06-23
Abstract
Abstract A method and apparatus for holographic analysis of oscillating objects, in which the recording laser beam, either before or after being split into reference and object beams, is amplitude modulated according to the function: WHERE Z0 IS AN ADJUSTABLE AMPLITUDE, omega IS THE ANGULAR FREQUENCY OF OSCILLATION OF AN OBJECT, phi IS A PHASE CONSTANT, AND N IS THE ORDINAL NUMBER OF THE GREATEST AMPLITUDE OF THE OSCILLATING OBJECT TO BE DETECTED.
Inventors
- 👤 F Mottier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:03
CPC Classifications
G; G03; G03H; G03H1/00; G01; G01H; G01H9/00; G03H1/04; G03H1/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
91 words
A method for the holographic analysis of an oscillating object, comprising directing a laser beam at said object as well as at a holographic plate, said plate also being impinged by reflections of said beam from said object, and amplitude modulating at least a portion of said beam substantially in accordance with the function: where zo is a freely selectable amplitude, omega is the angular frequency of the oscillating object, phi is a phaseconstant, and n is the ordinal number of the greatest amplitude of the oscillating object to be detected.
Claim 2
Independent Claim
91 words
A method for the holographic analysis of an oscillating object, comprising directing a laser beam at said object as well as at a holographic plate, said plate also being impinged by reflections of said beam from said object, and amplitude modulating at least a portion of said beam substantially in accordance with the function: where zo is a freely selectable amplitude, omega is the angular frequency of the oscillating object, phi is a phaseconstant, and n is the ordinal number of the greatest amplitude of the oscillating object to be detected.
Claim 3
Dependent Claim
52 words
The method according to claim 1, wherein said step of amplitude modulating comprises periodically interrupting said beam by means of strobe pulses derived from a control function zo sin omega t, whereby the beam interruption occurs only when the control function passes through predetermined ranges of values spaced by 2 pi .
Claim 4
Dependent Claim
54 words
The method according to claim 2, wherein said strobe pulses are derived by rectifying and chopping said control function in a modulus of 2 pi to produce a modified saw-tooth wave, and deriving said strobe pulses from said modified saw-tooth wave when said modified saw-tooth wave is passing through a predetermined range of values.
Claim 5
Dependent Claim
15 words
The method according to claim 3, comprising varying the width of said range of values.
Claim 6
Dependent Claim
18 words
The method according to claim 2, further comprising synchronizing said control function with the oscillating of said object.
Claim 7
Dependent Claim
15 words
The method according to claim 5, comprising deriving said control function from said oscillating object.
Claim 8
Dependent Claim
25 words
The method according to claim 1, comprising holographically producing an image of the object in stationary condition, and placing said produced image at said plate.
Claim 9
Independent Claim
102 words
An apparatus for the holographic analysis of an oscillating object, comprising a laser for providing a laser beam, a holographic plate, means for directing said beam on said oscillating object and on said holographic plate, means for directing reflections of said beam from said object onto said plate, and means for modulating at least a portion of said beam substantially in accordance with the function: where zo is a freely selectable amplitude, omega is the angular frequency of the oscillating object, phi is a phase-constant, and n is the ordinal number of the greatest amplitude of the oscillating object to be detected.
Claim 10
Independent Claim
102 words
An apparatus for the holographic analysis of an oscillating object, comprising a laser for providing a laser beam, a holographic plate, means for directing said beam on said oscillating object and on said holographic plate, means for directing reflections of said beam from said object onto said plate, and means for modulating at least a portion of said beam substantially in accordance with the function: where zo is a freely selectable amplitude, omega is the angular frequency of the oscillating object, phi is a phase-constant, and n is the ordinal number of the greatest amplitude of the oscillating object to be detected.
Claim 11
Dependent Claim
44 words
The apparatus according to claim 8, comprising means for deriving a control function zo sin omega t, means for full-wave rectifying said control function, and means for deriving strobe pulses from the rectified control function to produce modulating signals for modulating said laser beam.
Claim 12
Dependent Claim
134 words
The apparatus according to claim 9, wherein said means for deriving strobe pulses comprises an adder having a first input connected to receive said rectified control function, first and second comparators each having first and second inputs, said first input being connected to the output of said adder, means for applying voltages having fixed values of zero and 2 pi to the second inputs of said first and second comparators respectively, a counter having a forward counting input, a backward counting input and an output, means connecting the output, of said first and second comparators to said backward and forward counting inputs respEctively, means for applying the output of said counter to the other input of said adder, and window discriminator means connected to the output of said adder for deriving said strobe pulses.
Claim 13
Dependent Claim
26 words
The apparatus according to claim 9, wherein said means for deriving said control function comprises a sine wave generator and an adjustable phase shifter connected thereto.
Claim 14
Dependent Claim
30 words
The apparatus according to claim 9, wherein said means for deriving said control function comprises pickup means coupled to said object, and adjustable amplifier means connected to said pickup means.
Claim 15
Dependent Claim
46 words
The apparatus according to claim 10, wherein said window discriminator means is connected to said means for deriving strobe pulses to provide an output as long as the input to the discriminator means is within a predetermined voltage range disposed with respect to a given level.
Claim 16
Dependent Claim
19 words
The apparatus according to claim 13, comprising means for adjusting the position and the width of said voltage range.
Claim 17
Dependent Claim
16 words
The apparatus according to claim 13, wherein said given voltage level is the level pi .
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |