Title :
Synthetic-aperture optical imaging system using digital phase conjugation
Author_Institution :
Fac. of Eng., Takushoku Univ., Tokyo, Japan
Abstract :
A basic experiment which examines an image reconstruction algorithm is reported. In this experiment, the object-wave field data are collected by irradiating He-Ne laser light from each point on the aperture, superposing the reflected wave with the reference wave on the other aperture, and then detecting the resulting fringe pattern with a CCD array sensor. Next, the array data are processed on a computer to accomplish the following: first, to estimate the complex-amplitude of the wave field for each of the fringe patterns; secondly, to obtain the wave field, which may backpropagate to focus at a point on the object, by repeating the irradiation of the received and phase-conjugated wave between the two apertures; and finally, to form an image of the object by scanning the focused point in the azimuth directions. This algorithm requires only the information of the lateral spacings of receiving array elements in addition to the array data
Keywords :
computerised picture processing; optical radar; CCD array sensor; He-Ne laser; azimuth directions; complex-amplitude; digital phase conjugation; fringe pattern detection; image reconstruction algorithm; lateral spacings; object-wave field data; phase-conjugated wave; receiving array elements; reference wave; reflected wave; synthetic aperture optical imaging system; Apertures; Azimuth; Charge coupled devices; Focusing; Image reconstruction; Optical arrays; Optical imaging; Phase estimation; Phased arrays; Sensor arrays;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150937
