公开(公告)号：US4937786A

公开(公告)日：1990-06-26

申请号：US715748

申请日：1985-03-25

Applicant: Venkata Guruprasad

Inventor： Venkata Guruprasad

IPC: G02F1/09 ,  G03H1/02 ,  G11C13/04

CPC classification number: G11C13/043 ,  G02F1/09 ,  G03H1/02 ,  G03H2001/0224 ,  G03H2001/026 ,  G03H2001/0264 ,  G03H2222/31 ,  G03H2240/15 ,  G03H2240/25

Abstract: A hologram transducer using the Faraday effect in magnetic bubble devices for recording and reproducing the amplitude and phase distributions over a section of a beam of coherent light is disclosed. The transducer spatially modulates the intensity, by using linear polarization, and the phase, by using circular polarization, of light transmitted through a magnetic bubble device. Using linear polarization and a single magnetic bubble domain to traverse in a sequence the possible storage positions in the magnetic bubble device, the transducer samples at each of these positions the intensity of the transmitted light. Using in addition a coherent reference beam of light to interfere with the light being measured, the transducer samples the phase in the half range of 0 through .pi. radians at these positions. Further, using a quarter cycle phase shift in the reference beam, the transducer resolves the phase values over the full range of 0 through 2.pi. radians. Because of the localization of the sample values by the magnetic bubbles to the order of the wavelength of the light, optical holograms may be directly recorded as electrical signals by the transducer and the corresponding images reconstructed by the transducer from the electrical signals.

Abstract translation: 公开了一种使用在气泡装置中的法拉第效应的全息图传感器，用于记录和再现相干光束的一部分上的幅度和相位分布。 换能器通过使用线性极化空间调制强度，并且通过使用圆偏振来透射通过磁性气泡装置的光的相位。 使用线性极化和单个磁性气泡域来顺序地遍历磁性气泡装置中的可能的存储位置，这些传感器中的每个位置处的换能器样品都将透射光的强度定位。 另外使用相干参考光束来干扰所测量的光，换能器在这些位置通过π弧度在0的一半范围内对相位进行采样。 此外，使用参考光束中的四分之一周期相移，换能器在0至2 pi弧度的全范围内解析相位值。 由于通过磁性气泡将样本值定位成光的波长的顺序，光学全息图可以被传感器直接记录为电信号，并且由电信号由换能器重建的相应图像。

公开(公告)号：US11169249B2

公开(公告)日：2021-11-09

申请号：US15532974

申请日：2015-02-13

Applicant: Venkata Guruprasad

Inventor： Venkata Guruprasad

IPC: G01S11/02 ,  G01S11/12 ,  G01S11/14 ,  G01S13/34 ,  G01S15/00 ,  G01S17/00 ,  G01S13/00

Abstract: Spectral components of waves having one or more properties other than phase and amplitude that vary monotonically with time at a receiver, and provide retardations or lags in the variation in proportion to the times or distances traveled from the sources of the waves to the receiver. The lags concern the property values at departure from a source and are absent in its proximity. Orthogonality of the lags to modulated information makes them useful for ranging and for separation or isolation of signals by their source distances. Lags in frequencies and wavelengths permit multiplication of capacities of physical channels. Constancy of the lagging wavelengths along the entire path from a source to the receiver enables reception through channels or media unusable at the source wavelengths, as well as imaging at wavelengths different from the illumination.