51 results about "Coherent wave" patented technology

A method and apparatus for treating in situ biologic tissue include identifying a patient with a condition susceptible to treatment by forming a lesion in the tissue and accessing a surface of the tissue. A lesion formation tool is positioned against the accessed surface. The tool includes an optical fiber for guiding a coherent waveform of a selected wavelength to a fiber tip for discharge of light energy from the fiber tip. The wavelength is selected for the light energy to penetrate a full thickness of the tissue to form a volume of necrosed tissue through the thickness of the tissue. The tool further includes a guide tip coupled to the fiber tip. The guide tip is adapted to have a discharge bore aligned with the fiber tip to define an unobstructed light pathway from the fiber tip to the tissue surface. The guide tip is further adapted to be placed against the tissue surface with the guide tip slidable along the tissue surface in atraumatic sliding engagement with the discharge bore opposing the tissue surface. The lesion formation tool is manipulated to draw the guide tip over the tissue surface in a pathway while maintaining the discharge bore opposing the tissue surface to form a transmural lesion in the tissue extending a length of the pathway.

A coherent radiation imaging system that produces digital images with a reduced amount of speckle. Radiation from a long coherence length source is used to form an image of a sample. The output coherent wave is temporally divided into a plurality of wavelets. The spatial phase of each wavelet is then modulated a known and different amount. Each phase modulated wavelet illuminates the sample and is perturbed by its interaction with the sample. A spatial phase map of each perturbed wavelet is then created and converted to a sample image with an image reconstruction program. The plurality of sample images thus formed is statistically averaged to form a final averaged image. The high frequency speckle that is not optically resolvable tends to average to zero with continual statistical averaging, leaving only the optically resolvable lower frequency phase information.

A coherent radiation imaging system that produces digital images with a reduced amount of speckle. Radiation from a long coherence length source is used to form an image of a sample. The output coherent wave is temporally divided into a plurality of wavelets. The spatial phase of each wavelet is then modulated a known and different amount. Each phase modulated wavelet illuminates the sample and is perturbed by its interaction with the sample. A spatial phase map of each perturbed wavelet is then created and converted to a sample image with an image reconstruction program. The plurality of sample images thus formed is statistically averaged to form a final averaged image. The high frequency speckle that is not optically resolvable tends to average to zero with continual statistical averaging, leaving only the optically resolvable lower frequency phase information.

A system and method for providing coherent sources for phased arrays are provided. One method includes providing a plurality of transceivers configured to transmit signals and defining an array of nodes. The method also includes providing a plurality of beacons at different frequencies to one of aim or focus phase coherent energy generated by the transmitted signals from the plurality of transceivers, wherein the phase coherent energy is transmitted at a direction and a frequency determined with phase conjugation and independent of the location of the plurality of beacons.

A coherent radiation imaging system that produces digital images with a reduced amount of speckle. Radiation from a long coherence length source is used to form an image of a sample. The output coherent wave is temporally divided into a plurality of wavelets. The spatial phase of each wavelet is then modulated a known and different amount. Each phase modulated wavelet illuminates the sample and is perturbed by its interaction with the sample. A spatial phase map of each perturbed wavelet is then created and converted to a sample image with an image reconstruction program. The plurality of sample images thus formed is statistically averaged to form a final averaged image. The high frequency speckle that is not optically resolvable tends to average to zero with continual statistical averaging, leaving only the optically resolvable lower frequency phase information.

The disclosure relates to the field of holographic technology, and specifically provides a method for manufacturing an interference fringe mold and a mold and replication method thereof. The method comprises the following steps: (1) composite coherent wave sensitive material on the surface of a three-dimensional mold; (2) record interference fringes through a three-dimensional optical path, so that the composite sensitive material layer of the three-dimensional mold is loaded with interference fringes; the recording method of the three-dimensional optical path is as follows: The characteristics of recording information content Set up a suitable three-dimensional space optical path, and record information on the sensitive material layer according to requirements; (3) Repeat the three-dimensional mold with interference fringes for multiple inverse copies, and finally obtain an interference fringe mold with a certain hardness. It solves the problems in the prior art that the holographic illusion pattern is deformed or disappears due to the deformation of the plane template into a three-dimensional template to copy interference fringes, and the copied holographic illusion image has only a single viewing direction and a narrow viewing angle.

The invention provides an active and passive ultrasonic composite imaging method and system for focused ultrasonic irradiation on phase change nanometer liquid drops. After passive ultrasonic originalradio frequency signals are subjected to time delay compensation processing, a cross-correlation coefficient matrix and a passive amplitude coherent wave beam forming energy matrix are obtained respectively through two complementary square wave apodizing functions and an amplitude coherent coefficient; after the two matrixes are subjected to point multiplication, a high-resolution passive ultrasonic imaging result is obtained; phase change microbubble group mother wavelets are constructed through a phase change microbubble group vibration model; active wave beam forming radio frequency signals obtained after the mother wavelets are used for performing time delay superposition on the active ultrasonic original radio signals are subjected to continuous wavelet transformation to obtain a high-contrast active ultrasonic imaging result; and a composite image is obtained after the high-resolution passive and high-contrast active ultrasonic imaging results are compounded. The method and thesystem can be used for performing whole-process monitoring on cavitation activities in the focused ultrasonic irradiation process of the phase change nanometer liquid drops and the residue phase change microbubbles when the irradiation is stopped.