公开(公告)号：US3913061A

公开(公告)日：1975-10-14

申请号：US35423673

申请日：1973-04-25

Applicant: STANFORD RESEARCH INST

Inventor： GREEN PHILIP S

IPC: A61B8/00 ,  G01N29/04 ,  G01N29/28 ,  G02B7/18 ,  G10K11/30 ,  G10K11/06

CPC classification number: G10K11/30 ,  G02B7/1805

Abstract: Composite acoustic imaging and image deflection system adapted for use in a fluid medium and utilized for forming acoustic images with incident acoustic waves and at the same time deflecting or sweeping the image so formed over an image field so that the entire compressional acoustic image field of interest is swept by a line (in practice a linear array of transducers for converting the incident acoustic image compressional field to an equivalent electrical signal) contained in a plane which includes the axis of the incident acoustic image field. The imaging and image deflection system includes a composite lens assembly which incorporates two or more lens elements with a fluid filler medium contained therebetween to provide the focusing action and a pair of refracting prisms disposed between the lens elements (in the fluid medium) and mounted for counterrotation relative to each other, each in its own plane, to provide image deflection. In other embodiments the lens elements and prisms are combined by providing proper lens contours for prismatic lenses, e.g., by providing focusing lens contours on one side of each element and the slanting plane surface of a prism on the other face and providing means to counterrotate the lens elements so that the combined lens and prism elements perform both the focusing and image deflection functions. In order to reduce the radius of curvature of the lens elements and/or the slope of the sides of prisms to such an extent that mode conversion at liquid/solid interfaces is substantially eliminated while providing the required imaging and deflection (refraction), the materials of the lens, prisms and entrained liquid media are so selected that the velocity of propagation of acoustic waves in the medium at least on one side of the lens assembly is intermediate the velocity of propagation in the filler medium and the medium of the lenses and prisms.

公开(公告)号：US4016750B1

公开(公告)日：1994-04-05

申请号：US62959475

申请日：1975-11-06

Applicant: STANFORD RESEARCH INST

Inventor： GREEN PHILIP S

IPC: A61B8/00 ,  A61B8/08 ,  A61B8/14 ,  G01N29/06 ,  G01N29/44 ,  G01S7/52 ,  G01S15/89 ,  H04N7/18 ,  G01N29/00

CPC classification number: G01S15/8954 ,  A61B8/08 ,  G01N29/0609 ,  G01N29/0645 ,  G01N29/343 ,  G01N29/4454 ,  G01N29/4463 ,  G01S7/52046 ,  G01S7/52047

公开(公告)号：US3886490A

公开(公告)日：1975-05-27

申请号：US36387673

申请日：1973-05-25

Applicant: STANFORD RESEARCH INST

Inventor： GREEN PHILIP S

IPC: G01S7/52 ,  G01H3/12 ,  G01S15/89 ,  H04R1/44 ,  H04B11/00

CPC classification number: G01H3/125

Abstract: A compressional acoustic image field propagating in a fluid filled container is converted to electrical impulses which in turn provide a means for converting the incident compressional image field to a visual representation by locating a linear array of piezoelectric elements in intimate coupling contact with a thin, acoustically transparent window upon which the acoustic image field impinges. Coupling between the acoustic image field and the array of transducers is improved by providing a thin layer of coupling liquid on the outside of the window (the side in contact with the transducer array). The linear array effectively sweeps the entire compressional acoustic image field of interest mechanically moving the entire array back and forth (in a direction orthogonal to the linear array) across the window.