46results about How to "Reduce multiple reflections" patented technology

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.

In a photo-detection type ultrasonic receiving apparatus, the image quality of ultrasonic image has been enhanced by reducing multiple reflection of the ultrasonic wave. The ultrasonic receiving apparatus according to the present invention includes an ultrasonic detecting element for modulating light on the basis of a received ultrasonic wave, a backing portion directly or indirectly connected to the ultrasonic detecting element propagating the ultrasonic wave to be applied to the ultrasonic detecting element, the backing portion having optical transmissibility and guiding the light used for detecting ultrasonic wave, and a photoelectric conversion unit that detects the light output from the ultrasonic detecting element.

A probe and an antenna reduces the multiple reflection of electromagnetic waves. The probe includes: a waveguide; and a resonance unit entirely or partially disposed in the inside of the waveguide and comprising a conductor.

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.

The invention relates to an instantaneous remote-sensing polarization imaging device based on a microwave plate array and a realizing method thereof. The microwave plate array is used for performing polarization modulation on a remote sensing image which is acquired by a telescope. Then the remote sensing image is converted to two-dimensional light intensity distribution through a unidirectional polaroid. Data inversion is performed on the two-dimensional light intensity for obtaining the polarization information of the remote sensing image. The used microwave plate array is manufactured through ultrafast laser microprocessing. Four different kinds of phase modulations are introduced to each micro area of the image. After the polarization information is converted to the light intensity through the polaroid, the Stocks vector of the area can be calculated, thereby obtaining the complete polarization information of the whole image. The instantaneous remote-sensing polarization imaging device can perform dynamic target remote-sensing measurement, and furthermore realizes complete polarization measurement with high time resolution and high space resolution.

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 relates to a patterned substrate which comprises a basic substrate. The front of the basic substrate is etched to form a patterned projection arranged in an array mode. The patterned substrate is characterized in that the patterned projection comprises a plurality of projections, the widths of the projections are progressively decreased from bottom to top, the width of the bottom of an upper projection is as same as that of the top of a lower projection, and the uppermost projection of the patterned projection is multilaterally conical, multilaterally cylindrical, multilaterally trapezoidal or multilaterally square table-shaped. The basic substrate is a sapphire substrate, a silicon carbide substrate or a silicon substrate. The patterned projection and the basic substrate are made of the same materials. The uppermost projection of the patterned projection and the basic substrate are made of different materials, the projections below the uppermost projection of the patterned projection and the basic substrate are made of the same materials, and the uppermost projection of the patterned projection is made of SiO2, Si3N4, ZnO2, Si or GaAs. A reflecting surface is added, multiple reflection of light inside the patterned substrate is decreased, and the light extraction efficiency of a chip can be effectively improved.

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.

In a photo-detection type ultrasonic receiving apparatus, the image quality of ultrasonic image has been enhanced by reducing multiple reflection of the ultrasonic wave. The ultrasonic receiving apparatus according to the present invention includes an ultrasonic detecting element for modulating light on the basis of a received ultrasonic wave, a backing portion directly or indirectly connected to the ultrasonic detecting element propagating the ultrasonic wave to be applied to the ultrasonic detecting element, the backing portion having optical transmissibility and guiding the light used for detecting ultrasonic wave, and a photoelectric conversion unit that detects the light output from the ultrasonic detecting element.

A solid-state imaging device includes plural photosensitive elements 32, signal reading circuits and first type wiring 41 and 42. The photosensitive elements 32 are formed and arranged in a two-dimensional array state ion a light-receiving portion area of a semiconductor substrate 50. The signal reading circuits are formed so as to correspond to the respective photosensitive elements 32. Each signal reading circuit detects a captured image signal corresponding to signal charges of the photosensitive elements 32. The signal charges are accumulated in response to an amount of received light which comes from an object. The first type wiring 41 and 42 are formed of a high-concentration impurity diffused layer, are formed in one direction along a surface of the light-receiving portion area, and are connected to plural ones of the signal reading circuits which are provided along the one direction.

An ultrasonic flow sensor for use in a fluid medium is described. The ultrasonic flow sensor includes at least two ultrasonic converters which are situated in a flow tube offset relative to one another, longitudinally with respect to a flow of the fluid medium. The ultrasonic flow sensor also includes a reflection surface, the ultrasonic converters being set up to exchange ultrasonic signals via simple reflection on the reflection surface. In addition, a deflection device is provided between the ultrasonic converters which is set up to essentially suppress parasitic ultrasonic signals, which are reflected from the reflection surface and which strike the deflection device, by deflection away from the ultrasonic converters.

The invention discloses welding seam tracking and detecting equipment. The equipment comprises an imaging device, a structured light generator and an optical device, wherein the imaging device is used for imaging a welding seam; the structured light generator is used for generating structured light; and the optical device can reflect and refract light so as to split the structured light emitted from the structured light generator into refracted light and reflected light which irradiate to the welding seam. By using the welding seam tracking and detecting equipment of the invention, a structured light splitting effect is achieved by adopting the reflection and refraction properties of the optical device, so as to split the structured light, and detect and track a curve welding seam with complex shapes.

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.

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.

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 relates to an ultrasonic energy transducer with continuously changed acoustic impedances, which comprises a bake lining and a piezoelectric material layer which are sequentially overlapped, wherein an acoustic impedance continuous change layer is arranged between the piezoelectric material layer and a working medium. The ultrasonic energy transducer with continuously changed acoustic impedances can realize the acoustic matching among different acoustic impedances by only one acoustic impedance continuous change layer so as to ensure that the structure of the ultrasonic energy transducer is greatly simplified, and multiple reflection among structure layers does not exist, thereby improving the emission efficiency of acoustic energy.

A spectroscopic unit and spectroscopic device according to the present invention are provided with a filter that is provided with a plurality of optical filter elements disposed in order from the entrance side to the exit side of light under measurement and has different transmission wavelengths corresponding to entrance positions along a first direction. A first optical filter element from among the plurality of optical filter elements is tilted with respect to a second optical filter element disposed adjacently to the first optical filter element as a result of the first optical filter element being rotated by a prescribed angle with a third direction that is perpendicular to both the first direction and s second direction from the entrance side to the exit side as the axis of rotation thereof or being rotated by a prescribed angle with the first direction as the axis of rotation thereof.

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.

The invention discloses welding seam tracking and detecting equipment. The equipment comprises an imaging device, a structured light generator and an optical device, wherein the imaging device is used for imaging a welding seam; the structured light generator is used for generating structured light; and the optical device can reflect and refract light so as to split the structured light emitted from the structured light generator into refracted light and reflected light which irradiate to the welding seam. By using the welding seam tracking and detecting equipment of the invention, a structured light splitting effect is achieved by adopting the reflection and refraction properties of the optical device, so as to split the structured light, and detect and track a curve welding seam with complex shapes.

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.

An ultrasonic flow sensor for use in a fluid medium is described. The ultrasonic flow sensor includes at least two ultrasonic converters which are situated in a flow tube offset relative to one another, longitudinally with respect to a flow of the fluid medium. The ultrasonic flow sensor also includes a reflection surface, the ultrasonic converters being set up to exchange ultrasonic signals via simple reflection on the reflection surface. In addition, a deflection device is provided between the ultrasonic converters which is set up to essentially suppress parasitic ultrasonic signals, which are reflected from the reflection surface and which strike the deflection device, by deflection away from the ultrasonic converters.