US3831436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-purpose real-time holographic polariscope
Assignee: Individual
•
Filing: 1973-02-23
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Granted: 1974-08-27
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Expires: 1993-02-23
Abstract
Abstract A modification of a real-time holographic interferometer to permit the observation of a complete set of interference patterns from a single reference hologram. The apparatus consists of a conventional off-axis transmission holographic set-up with the addition of several polarization optical elements to alter the polarization of the light at various stages of a procedure to study an object. These elements are adjusted so as to produce circularly polarized light for recording the reference hologram. After producing the hologram these elements are readjusted to any desired state of polarization and the corresponding interference pattern is observed in real-time and may be changed at any time to view a different type of interference pattern.
Inventors
- 👤 R Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:21
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/021; Y; Y10; Y10S; Y10S359/00; Y10S359/902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A method of investigating the characteristics of a birefringent object through the use of a modified real time holographic interferometer comprising the steps of: illuminating an object at a reference state with circularly polarized light in said modified interferometer such that a hologram is recorded; inducing a change in the physical state of said object; reilluminating said recorded hologram in said modified interferometer with plane polarized light; rotating the plane of polarization of said reilluminating light so that different characteristics of said birefringent object can be observed.
Claim 2
Independent Claim
87 words
A method of investigating the characteristics of a birefringent object through the use of a modified real time holographic interferometer comprising the steps of: illuminating an object at a reference state with circularly polarized light in said modified interferometer such that a hologram is recorded; inducing a change in the physical state of said object; reilluminating said recorded hologram in said modified interferometer with plane polarized light; rotating the plane of polarization of said reilluminating light so that different characteristics of said birefringent object can be observed.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the plane of polarization of said reilluminating light is rotated to be parallel to one of the principal indices of refraction.
Claim 4
Dependent Claim
92 words
In an off-axis real time holographic interferometer having a beam splitter for splitting an input light source into a reference and an object beam wherein said reference beam and said object beam interfere to form a diffraction pattern at a holographic plate, the improvement comprising: a first polarizer disposed between said beam splitter and said light source; a first waveplate disposed between said beam splitter and said first polarizer; a second polarizer disposed between said holographic plate and, an observer; a second waveplate disposed between said second polarizer and said holographic plate.
Claim 5
Dependent Claim
92 words
In an off-axis real time holographic interferometer having a beam splitter for splitting an input light source into a reference and an object beam wherein said reference beam and said object beam interfere to form a diffraction pattern at a holographic plate, the improvement comprising: a first polarizer disposed between said beam splitter and said light source; a first waveplate disposed between said beam splitter and said first polarizer; a second polarizer disposed between said holographic plate and, an observer; a second waveplate disposed between said second polarizer and said holographic plate.
Claim 6
Dependent Claim
80 words
In an off-axis real time holographic interferometer having a beam splitter for splitting a plane polarized input light source into a reference and an object beam wherein said reference beam and said object beam interfere to form a diffraction pattern at a holographic plate, the improvement comprising: a first waveplate disposed between said beam splitter and said light source; a polarizer disposed between said holographic plate and, an observer; a second waveplate disposed between said polarizer and said holographic plate.
Claim 7
Dependent Claim
80 words
In an off-axis real time holographic interferometer having a beam splitter for splitting a plane polarized input light source into a reference and an object beam wherein said reference beam and said object beam interfere to form a diffraction pattern at a holographic plate, the improvement comprising: a first waveplate disposed between said beam splitter and said light source; a polarizer disposed between said holographic plate and, an observer; a second waveplate disposed between said polarizer and said holographic plate.
Claim 8
Dependent Claim
17 words
The method of claim 1, further including the step of: obstructing the reference beam of said interferometer.
Claim 9
Dependent Claim
13 words
The combination of claim 3, further including: means to obstruct said reference beam.
Claim 10
Dependent Claim
13 words
The combination of claim 4, further including: means to obstruct said reference beam.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |