45results about How to "Reduce multiple reflections" patented technology

The invention relates to a system and method for the removal of wrinkles and/or provide the rejuvenation of the human skin by use of ultrasound. The method comprises determining a 3D image of a region of the skin using ultrasound, determining a focal depth of the ultrasonic beam for different locations of the skin based on the 3D image, performing the treatment by heating the skin at different locations using an ultrasonic beam, and adjusting the focal depth of the ultrasonic beam according to the determined focal depths during the process of heating the skin at different locations.

A method for attenuating multiple reflections in seismic signals includes coherency filtering the seismic signals. The seismic signals are low pass filtered and high pass filtered seismic signals at a frequency selected such that substantially only multiple reflections exist in the seismic signals above the frequency. A mask is generated having unity value where the high pass filtered signal amplitude exceeds a selected threshold. The mask has unity zero value for all other filtered signals. The mask value is multiplied by the low pass filtered signals. The multiplied signals are added to the high pass filtered signals and a coherency filter is applied to remove remaining primary energy to generate a model of the multiple reflections. The multiple reflection model is subtracted from the coherency filtered seismic signals.

The invention relates to an optical light guide element (1) having a first end section (8) with a light entrance area (6) designed for facing a light-transparent opening (50) and having a second end section (9) with a light exit area (7) designed for facing a light sensor (52), wherein the light entrance area (6) is defined by a surface area on the optical light guide element (1) which faces the light-transparent opening (50) and the first end section (8) forms an inclined surface area (2) which has an acute angle with the surface area of the light entrance area (6).

The invention discloses a sub-arc-second large-aperture compact optical structure for detecting dim point targets. The sub-arc-second large-aperture compact optical structure comprises a lens drum, as well as an optical system and an image surface which are arranged inside the lens drum, wherein the optical system comprises a first aperture correcting lens, a secondary reflector, a second aperture correcting lens, a first view field correcting lens, a second view field correcting lens and a main reflector; the axle centers of the first aperture correcting lens, the secondary reflector, the second aperture correcting lens, the first view field correcting lens, the second view field correcting lens and the main reflector are sequentially arranged in the same straight line; the secondary reflector is clung to the side surface of the first aperture correcting lens; the coverage range of the side surface of the first aperture correcting lens of the secondary reflector meets the imaging requirement; a circular hole is formed in the center of the main reflecting lens; the first view field correcting lens and the second view field correcting lens are arranged in the range limited by an opening of the circular hole; the image surface is arranged at the center of the side surface of the main reflector. The measurement accuracy of the sub-arc-second large-aperture compact optical structure is superior to the sub-arc-second grade; the optical aperture is equivalent to the total optical length; the structure is compact in structure and is suitable for detection of the dim point targets such as super-high-accuracy star sensors and space fragments.

The invention relates to a microscopic polarization imaging device based on a microwave sheet array, which comprises a laser source, a microscope objective, a microscope eyepiece, a microwave sheet array, an one-way polaroid, an imaging lens and an area-array camera which are orderly arranged in parallel, wherein a sample to be measured is placed on a focal distance position of the microscope objective between the laser source and the microscope objective, the microscope objective and the microscope eyepiece magnify images which are formed through the sample to be measured, the microwave sheet array is arranged on a focal distance position of the microscope eyepiece, the magnified images are polarized and modulated, a two dimensional polarization distribution of the images of the one-way polaroid is converted to be a two-dimensional light strength distribution, and the two-dimensional light strength distribution is distributed and coupled into the area-array camera through the imaging lens. The invention further relates to an implement method of the microscopic polarization imaging device based on the microwave sheet array. The microscopic polarization imaging device based on the microwave sheet array and the implement method thereof can measure dynamic conditions, and achieves complete polarization state measurement of microscope images in high time and space resolution.

The invention discloses a solar light condensed heat collector and a method for designing the solar light condensed heat collector. A paraboloid main reflector is arranged. A vacuum heat collecting pipe is installed on the symmetrical axis of the cross section of the paraboloid main reflector and on the inner side of the focal line of the paraboloid main reflector. An even light reflector is installed on the outer side of the focal line of the paraboloid main reflector. The even light reflector and an opening of the paraboloid main reflector are oppositely arranged and fixedly connected. According to the solar light condensed heat collector and the method for designing the solar light condensed heat collector, the vacuum heat collecting pipe is arranged below the position of the focal line of the paraboloid main reflector, the even light reflector is additionally arranged and opposite to the opening of the paraboloid main reflector, solar radiation energy can be distributed at the bottom and the top of a heat absorption pipe, solar energy flux density distribution on the wall face of the heat absorption pipe is homogenized, the temperature gradient and the highest temperature of the wall face of the heat absorption pipe are reduced, a series of problems caused by uneven energy flux density can be avoided from the source, and safety performance of the vacuum heat collecting pipe is improved.

The aim of the present invention is a sub-reflector of a dual-reflector antenna comprising:

a first end having a junction of a first diameter, adapted for coupling to the end of a waveguide,

a second end, having a second diameter greater than the first diameter,

a convex reflective internal surface placed at the second end having an axis of revolution,

an external surface of the same axis, joining the two ends,

a dielectric material extending between the first and the second ends and limited by the internal surface and the external surface,

In accordance with the invention, the external surface has a convex profile described by a polynomial equation of the sixth degree of the formula: y=ax⁶+bx⁵+cx⁴+dx³+ex²+fx+g where a is not zero.

The invention discloses an opened type loudspeaker device, comprising a bracket, a vibration film with an inner hole at a center, a voice coil, a positioning support chip for supporting the voice coil, and a magnetic path system, wherein the bracket is concave inwards to form a cavity with a volume; an outer end of the vibration film is connected with an external part of the bracket; an inner end of the vibration film is connected with a coil frame of the voice coil; the voice coil is arranged in the magnetic path system; and the positioning support chip is located between the vibration film and the bracket. The opened type loudspeaker device is characterized in that: the vibration film is provided with at least one through hole capable of effectively releasing an air pressure in a small air chamber when the vibration film vibrates; at least one opening is arranged on a wall of the bracket; and an edge of the opening extends outwards to form an annular wall. The opened type loudspeaker device disclosed by the invention can normally carry out sound production without mounting a traditional box body, so as to simplify a loudspeaker, remove the sound pollution of the box body, improve the sound quality, simplify the assembly process and optimize the cost.

A transparent layered element includes two transparent external layers having substantially the same refractive index and each having a smooth external main surface, and a central layer intermediate between the external layers, the central layer including at least one transparent layer of refractive index different from that of the external layers or a metal layer. All the contact surfaces between two adjacent layers of the layered element, one of the two layers of which is a metal layer, or that are two transparent layers of different refractive indices, being textured and parallel to one another, the diffuse light reflection of the layered element on the side of at least one of the external layers having at least one maximum in a direction different from the direction of specular reflection. In addition, the surface of the layered element is divided into a plurality of pixels of same size.

The invention discloses a low-scattering broadband dual-polarized probe antenna based on a reverse four-ridge structure. The low-scattering broadband dual-polarized probe antenna comprises a circularopening waveguide, an axial ripple, the reverse four-ridge structure, a bottom supporting block and a feed coaxial line. A first end of the circular opening waveguide is closed, and the second end isprovided with an opening. The openings are arranged in the two ends of the axial ripple. The reverse four-ridge structure is a cross-shaped structure; an outer side of each ridge plate comprises a curve changing section and an impedance adjusting section; an outer ridge line of the curve change section is a three-order Bessel function; and the outer ridge line of the impedance adjusting section isa straight line. The bottom supporting block is a cross-shaped structure composed of four trapezoidal blocks, and the reverse four-ridge structure is connected with the circular opening waveguide through the bottom supporting block. And the feed coaxial line is electrically connected with the reverse four-ridge structure through a through hole in a side wall of the circular opening waveguide. Inthe invention, a bandwidth of the circular opening waveguide antenna is improved, and the antenna has advantages of a high cross polarization identification degree, a high port isolation degree, a smooth in-band gain change and a low scattering effect.

An ultrasonic diagnosis apparatus according to an embodiment includes a controller (18), a processor (12), and an image generator (15). The controller (18) selects at least one transducer element in a reception aperture formed of a transducer element group arranged in a predetermined direction, based on at least one of a deflection angle of an ultrasonic wave, an angle between the predetermined direction and a direction indicating a boundary of a structure, and an angle between a direction perpendicular to a normal direction where the predetermined direction intersects with a center of the transducer element group and the direction indicating the boundary. The processor (12) performs processing such that a signal intensity of a reception signal generated in the at least one transducer element is reduced, to output the reception signal of the reception aperture. The image generator (15) generates ultrasonic image data, based on the reception signal.

The invention discloses a radiation cooling coating and a preparation method thereof, and relates to the technical field of coatings. Wherein the radiation cooling coating comprises the following components in parts by weight: 5-7 parts of polysiloxane resin, 20-25 parts of reflective powder, 18-22 parts of hydrophobic modified silicon dioxide, 1-3 parts of fibers, 40-50 parts of a solvent and 0.25-0.7 part of a curing agent. In the technical scheme provided by the invention, the polysiloxane resin has good corrosion resistance, ultraviolet resistance and hydrophobicity, so that the service life of the radiation cooling coating is longer; meanwhile, the polysiloxane resin and the silicon dioxide have a large number of silicon-oxygen bonds and have absorption peaks in the wave band of 8-14 microns, so that the radiation rate is excellent, and through the synergistic effect of the polysiloxane resin and the silicon dioxide, the radiation cooling performance is excellent; the reflective powder has excellent retroreflection performance, and by adding the reflective powder, the absorbed sunlight can be retroreflected into extremely cold space, so that multiple reflections of the sunlight among urban high-rise buildings are effectively reduced, and the heat island effect is further reduced.

An ultrasonic flow meter (100) includes a housing (108) for attaching to a fluid pipe (160). A first piezoelectric element (128) coupled to a transmitter (Tx 111) and receiver (Rx 112) is configured to emit ultrasonic waves in an axial direction perpendicular to a horizontal plane defined by the piezoelectric element. A lens combination is in a lower housing portion (108b) positioned radially outside the first piezoelectric element including a refocusing lens (130) that is ring-shaped configured for redirecting received radial ultrasonic waves to travel in an axial direction perpendicular to the horizontal plane and has a thickness profile configured to act as a matching layer for reducing multiple reflections within the lower housing portion. A second lens (140) that is disc-shaped below the refocusing lens is configured for redirecting the radial ultrasonic waves to travel in the axial direction.

The invention discloses a modified graphite-based functional filler, a thermal interface material and preparation methods of the modified graphite-based functional filler and the thermal interface material, the modified graphite-based functional filler comprises vermicular expanded graphite, and the surface of the vermicular expanded graphite is provided with a chemical active coating; the chemical active coating is used for introducing an active group to improve the polarity of the vermicular expanded graphite; the thermal interface material comprises the modified graphite-based functional filler and liquid rubber; and the problem that application of an existing thermal interface material is limited due to the fact that the existing thermal interface material cannot achieve multi-coupling balance of the flexible characteristic, the heat conduction performance and the electromagnetic shielding effectiveness is solved.