Difference Holography

Collins, Leland F.

doi:10.1364/ao.7.000203

Cited by 25 publications

(1 citation statement)

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“…(iv) Collins (1968) has shown that by altering the relative phase between the object beam and the reference beam by 180" between the two exposures necessary for a frozen fringes hologram, those parts of the object which remained undistorted or stationary will vanish on reconstruction. This phase shifting may be accomplished by varying the pressure in an air cell; by utilization of this device, wide variations in the relative phase may be produced if necessary.…”

Section: Modijicationsmentioning

confidence: 99%

Vibration analysis by holography

Fryer¹

1970

Rep. Prog. Phys.

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Contents 1. Introduction . 2. Holography in general . 2.1. Theory , 2.2. General holographic techniques . 2.3. Holographic recording media . 2.4. Techniques for maximum light utilization 3.1. Theory , 3.2. The basic stroboscopic method and its uses . 3.3. Live and frozen fringe techniques. 3.4. Strobing techniques . 3.5. Advantages of the stroboscopic method 3.6. Disadvantages of the stroboscopic method 4.1. Theory .4.2. Advantages and disadvantages of the time-averaged method 4.3. Modifications . 4.4. An application of time-averaged holography. 5 . Alterations in sensitivity, and related methods . 5.1. Methods for increasing sensitivity . 5.2. Methods for reducing sensitivity . 5.3. Related methods of vibration analysis . 5.4. Conclusion..

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Section: Modijicationsmentioning

confidence: 99%