Holographic depth correction

Claim 2

Apparatus for constructing a hologram by probing an object with wave energy having a first wavelength, said hologram to be used to reconstruct an image of the object by using wave energy of a second shorter wavelength, comprising: A. means for deriving first electrical information in terms of a complex set of phase shifts of said wave energy having a first wavelength holographically representing the object, B. means responsive to said first electrical information for multiplying each of said phase shifts by the ratio of said first wavelength to said second wavelength to provide additional electrical information holographically representative of said object in terms of the set of said multiplied phase shifts, and C. means responsive to said additional electrical information for constructing said hologram from said multiplied phase shifts.

Claim 3

Apparatus according to claim 1 wherein said wave energy having a first wavelength is ultrasonic energy and said wave energy of a second shorter wavelength is visible light energy.

Claim 4

Apparatus according to claim 1 wherein said wave energy having a first wavelength is microwave energy and said wave energy of a second shorter wavelength is visible light energy.

Claim 5

Apparatus for deriving phase only holograms by the use of wave energy at a first longer wave length to obtain a first complex set of phase shifts holographically representative of an object from which said wave energy is reflected and by processing the information representative of said first set of phase shifts to multiply the first phase shifts by a constant factor to obtain and holographically record data represented by second phase shifts of a magnitude which would exist if the wave energy reflected from the object were of a second shorter wavelength, comprising: A. means for generating a series of first pulses of wave energy, said pulses containing a burst of said wave energy at a first high frequency, said first frequency having a value such that, when directed through a wave-transmitting medium by which said object is surrounded, wave energy of said first longer wavelength results, B. means for transmitting said first pulses through said medium toward said object, C. means for independently receiving said wave energy reflected from said object at each of a plurality of detection points to obtain a corresponding plurality of signals bearing information holographIcally descriptive of said object in terms of said first phase shifts a4 each of said detection points, D. means for generating a first reference signal having a phase at least partially controlled by the phase of the high-frequency wave energy in each of the received reflected first pulses, E. means for generating a second reference signal having a phase controlled by the phase of the transmitted wave energy, and F. means for sampling and recording phase differences between the first reference signal and the second reference signal at a series of predetermined times when each of said phase differences are substantially equal to the respective phase shifts received at each of said detection points multiplied by the ratio of said first wavelength to said second wavelength

Claim 6

Apparatus for deriving phase only holograms by the use of wave energy at a first longer wave length to obtain a first complex set of phase shifts holographically representative of an object from which said wave energy is reflected and by processing the information representative of said first set of phase shifts to multiply the first phase shifts by a constant factor to obtain and holographically record data represented by second phase shifts of a magnitude which would exist if the wave energy reflected from the object were of a second shorter wavelength, comprising: A. means for generating a series of first pulses of wave energy, said pulses containing a burst of said wave energy at a first high frequency, said first frequency having a value such that, when directed through a wave-transmitting medium by which said object is surrounded, wave energy of said first longer wavelength results, B. means for transmitting said first pulses through said medium toward said object, C. means for independently receiving said wave energy reflected from said object at each of a plurality of detection points to obtain a corresponding plurality of signals bearing information holographIcally descriptive of said object in terms of said first phase shifts a4 each of said detection points, D. means for generating a first reference signal having a phase at least partially controlled by the phase of the high-frequency wave energy in each of the received reflected first pulses, E. means for generating a second reference signal having a phase controlled by the phase of the transmitted wave energy, and F. means for sampling and recording phase differences between the first reference signal and the second reference signal at a series of predetermined times when each of said phase differences are substantially equal to the respective phase shifts received at each of said detection points multiplied by the ratio of said first wavelength to said second wavelength

Claim 7

Apparatus according to claim 4 wherein said means for generating a first reference signal comprises: A. a first oscillator for generating said first reference signal, B. means for controlling the first oscillator to cause the initial phase of said first reference signal to be synchronized with the phase of the high frequency wave energy in the transmitted first pulses, and C. means for controlling the frequency of said first oscillator to lock the phase of a later portion of the first reference signal to said high-frequency wave energy in the received reflected wave energy, and wherein said means for generating a second reference signal comprises: D. a seCond oscillator for generating said second reference signa , and E. means for controlling said second oscillator to cause said second reference signal to be locked in phase and frequency to the transmitted first pulses.

Claim 8

Apparatus according to claim 5 wherein said means for controlling the first oscillator to cause the initial phase of said first reference signal to be synchronized with the phase of the high frequency wave energy in the transmitted first pulses comprises means to cause said initial phase of the first reference signal to be synchronized with the phase of the high frequency wave energy in a delayed Version of the transmitted first pulses.

Claim 9

Apparatus according to claim 5 wherein said means for controlling the first oscillator to cause the initial phase of said first reference signal to be synchronized with the phase of the high frequency wave energy in the transmitted first pulses comprises means to cause said initial phase of the first reference signal to be synchronized with the phase of the high-frequency wave energy in a non-delayed version of the transmitted first pulses.

Claim 10

Apparatus according to claim 4 for use with ultrasonic acoustic holography wherein said means for generating a first reference signal comprises: A. a first oscillator for generating a first reference signal at a given high frequency which would have a wavelength in said medium similar to the wavelength of light, and B. means for triggering said first oscillator to begin oscillation at a given phase relationship with said received reflected pulses, and wherein said means for generating a second reference signal comprises: C. a second oscillator for generating a second reference signal at said given high frequency, and D. means for triggering said second oscillator to begin oscillation at said given phase relationship with said transmitted pulses.