An imaging method by means of hologram matrix - Experimental study of image reproduction

A method of two-dimensional imaging by means of a hologram matrix is presented. The method differs from conventional holography in that its matrix, containing the most elementary information of a target, permits high resolution by means of confocal processing by a computer in which the synthetic beams from the transmitters and receivers are both focused at a common image point. An ultrasound experiment was carried out for several model targets in order to verify theoretical resolutions of twice the wavelength for an orthogonal arrangement of the transmitting and receiving arrays. The resolutions came close to theoretical values as long as the number of points composing the target was not too large. Phase and amplitude compensation effects in each antenna channel of the array are also discussed.