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Featured researches published by Rolf K. Mueller.


Journal of the Optical Society of America | 1972

Fresnel-Zone-Plate Spectrometer with Central Stop*

P. N. Keating; Rolf K. Mueller; Takeo Sawatari

The marked chromatic aberration of a Fresnel-zone-plate lens can be used as a variable narrow-band optical filter, and thus a holographic spectrometer. The filtering properties of the zone plate are analyzed, with particular emphasis on the effect of a central stop over the low-order rings. It is shown that the central stop can markedly improve the rejection of frequencies outside the pass band without significant degradation of the spectrometer resolution.


Archive | 1970

An Underwater Viewing System Using Sound Holography

Harry Robert Farrah; Emanuel Marom; Rolf K. Mueller

A proposed operational underwater acoustical imaging system using sound holography is described. The performance of the imaging system depends on operational requirements of the user, physical constraints caused by space and power limitations, and the characteristics of each of the essential elements of the system. Each of these factors is discussed from a systems standpoint, with particular emphasis on the performance requirements of the necessary acoustical array, electronic processing, and optical reconstruction and display techniques. A brief summary is given of the status of current developmental programs at Bendix aimed at satisfying the above system requirements.


Archive | 1974

Complex On-Axis Holograms and Reconstruction without Conjugate Images

P. N. Keating; R. F. Koppelmann; Rolf K. Mueller; R. F. Steinberg

Holograms representing both real and imaginary parts have been obtained with an on-axis reference from an experimental acoustical underwater viewing system and digitally reconstructed to yield only the real image. The absence of both the conjugate imagery and dc and autoconvolution terms allows maximum efficiency in utilizing the relatively limited amount of sampling often available for microwave and acoustic radiation and reduces conjugate image noise. Improved imagery of underwater targets which has been obtained in this way with relatively light sampling (20 × 20) is presented.


Archive | 1975

MAXIMIZATION OF RESOLUTION IN THREE DIMENSIONS

P. N. Keating; R. F. Koppelmann; Rolf K. Mueller

The maximization of resolution in three dimensions (range and two lateral dimensions) is discussed, with emphasis on sampled acoustical holograms. An analysis of holography using wide-bandwidth biphase-coded acoustical signals is presented, and experimental results showing substantial increases in range resolution without significant loss of image quality are presented. It is shown that in order to maximize the lateral resolution it is necessary to have a larger number of picture elements in the image intensity display than in the sampled hologram. Experimental results clearly illustrating this point are presented.


Archive | 1970

INTERROGATING TIRE PRESSURE INDICATOR

Rolf K. Mueller; William G. Wolber


Archive | 1980

Low angle radar processing means

Takeo Sawatari; P. N. Keating; R. F. Steinberg; Rolf K. Mueller


Archive | 1970

Holographic system for forming images of both stationary and moving objects

Harry Robert Farrah; Emanuel Marom; Rolf K. Mueller


Archive | 1971

HOLOGRAM SYNTHESIS USING A DISPLACEABLE REFERENCE POINT SOURCE

Rolf K. Mueller; Emanuel Marom


Archive | 1969

Electronic simulation of variable inclination reference beam for acoustical holography

Harold L Chambers; Emanuel Marom; Rolf K. Mueller


Archive | 1972

Method and apparatus of synthesizing a hologram

Rolf K. Mueller; Emanuel Marom

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