258 results about "Cavity resonance" patented technology

Optical semiconductor device with resonant cavity tunable in wavelength, application to modulation of light intensity.This device comprises a resonant cavity (2) delimited by two mirrors (4, 6) and at least one super-lattice (14) that is placed in the cavity and is formed from piezoelectric semiconducting layers, and means (20) of injecting charge carriers into the super-lattice. The optical properties of this super-lattice can thus be modified and the wavelength of cavity resonance modes can be offset. The invention is particularly applicable to optical telecommunications.

A sensing and control system and method is disclosed, which utilizes cavity resonance and waveguide measurements to directly monitor process state variables or detect changes in the state of a system and provide direct in situ feedback control top optimize the process. The same system may be used to monitor a number of different process parameters including the composition, amount, distribution, and physical or chemical properties of a material, or to monitor the state or health of a system or sub-system. The system is broadly applicable to wide range of systems and process including ranging from engines and exhaust systems to production plants.

Provided is a low-noise pneumatic tire for reducing a cavity resonance sound generated inside the tire. An inner liner layer is made of a thermoplastic resin or a thermoplastic elastomer composition formed by blending the thermoplastic resin with an elastomer. Multiple types of convex portions differing from each other in protruding height h are formed on at least a region of an inner wall surface of the inner liner layer, the region corresponding to a tread portion. Each of the convex portions has a strip shape, protrudes from the inner liner layer, and extends in a tire width direction. The convex portions are intermittently arranged in a tire circumferential direction.

Disclosed is an electromagnetic wave transmission device with regulative and controllable magnetic field based on sub-monolayer wavelength metal grating; the device comprises a sub-monolayer wavelength metal grating and magnetoactive medium filled in the slit of the sub-monolayer metal grating; the metal part of the device and the magnetoactive medium have the same thickness, the thickness at least meets and supports the lowest-level Fabry-Perot cavity resonance demand of the designed work wavelength in the grating slit; the period and slit of the grating are shorter than the wavelength of the electromagnetic wave. By changing the size of the additional magnetic field, the propagation constant of the waveguide mode in the metal grating slit can be regulated to change the electromagnetic transmission characteristic of the device and realize the purpose of initial regulation of polarization-independent electromagnetic wave transmission spectrum and the electromagnetic wave transmission spectrum magnetic field.

The disclosure describes an absorption spectroscopy method for sensing hydrogen gas in a sample atmosphere and an associated hydrogen sensor. A light beam, having a wavelength corresponding to a vibrational transition of hydrogen molecules from a ground vibration state to any excited rotational vibration state via a quadrupole interaction, is introduced into an optical cavity adapted to receive a sample atmosphere to be tested for the presence of hydrogen gas. The light is introduced into the cavity in an off-axis alignment to systematically eliminate cavity resonances, while preserving the absorption signal amplifying properties of such cavities. Hydrogen absorption is measured is terms of cavity output, as in the ICOS technique.

The invention provides a thin broadband sound-absorbing structure. The structure comprises a sound-absorbing material, a support and at least two layers of mechanical impedance plates, wherein the sound-absorbing material is installed on the inner side of one end of the support, a supporting plate is arranged on the inner wall of the other end of the support, each of the mechanical impedance plates consists of a back plate and sticky elastic rings at two ends of the back plate, adjacent back plates are not in contact, sticky elastic rings are stuck to the supporting plate through an adhesive, the sticky elastic rings, the support inner wall and the back plates are attached tightly, a hollow is formed among the sound-absorbing material and the mechanical impedance plates, and the back plate on the outermost side is recessed towards the support end face by certain distance. Mechanical impedance is coupled to a traditional sound-absorbing material and a cavity resonance absorption mechanism, a novel thin broadband sound-absorbing mechanism is formed, the structure thickness is not increased basically based on the acoustic performance, the middle/high-frequency sound absorption performance is good, the low-frequency sound absorption effect is improved greatly and the sound-absorbing structure of which the thickness is thin and the sound-absorbing frequency band is wide is produced.

Frequency selection surface with dual band pass can be utilized as frequency range multiplexer to apply to antenna in multiple frequencies in comm. system of satellite, radar etc. identical periodic outer square annular slot units and periodic inner square annular slot units are etched on up and low metal surfaces of base plate so as to form periodic dual square annular slot array in two layers. A series of metalized through holes with even interval surrounding each doublelayer square annular periodic slot unit are set up on laminated base plate so as to form integrated wave-guide cavity on base plate equivalent to traditional metal cavity. Comparing with frequency selection surface in dual frequency composed of periodic patches or slots in two different sizes, the new structure introduces cavity resonance mode, realizes unilateral drooping characteristic in dual frequency so as to raise selectivity characteristic greatly, and provides good stability for angle and polarizability.

An electronic calibration circuit for calibrating a network analyzer. The electronic calibration circuit comprises at least one port for coupling the electronic calibration circuit to the network analyzer. A plurality of switching circuits coupled to the port are operable to provide a plurality of impedance states for electronically calibrating the network analyzer, wherein a transmission line couples at least two of the plurality of switching circuits, the transmission line short enough to reduce interactions of impedance mismatches and to reduce transmission loss. The port and the plurality of switching circuits are comprised within an integrated circuit having a package size small enough to avoid cavity resonance at a high frequency.

A purpose of the present invention is to provide a rim wheel and a tire rim assembly which are capable of effectively reducing cavity resonance of a tire, and accordingly, enhancing quietness and riding comfort. A plurality of cap members 20 is arranged on an outer circumferential surface of a rim 16 in a circumferential direction thereof, diaphragms are disposed inwardly of each cap member 20, and a plurality of sub-air chambers 32 is formed between the rim 16 and the cap members 20 in a rim circumferential direction. The tire main air chamber 18 is connected to the sub-air chambers 32 through communicating holes 24 formed on the cap members 20. The sub-air chambers 32 and the communicating holes 24 constitute a Helmholtz resonance noise absorber that can absorb vibration with specified frequencies. Further, since the sub-air chamber 32 is not formed in a continuous annular shape in a tire circumferential direction, occurrence of cavity resonance can be suppressed and a substantial reduction in noise can be secured.

The invention provides a low-frequency broadband Helmholtz underwater acoustic transducer, and belongs to the technical field of underwater acoustic transducers. The transducer comprises a III flextensional transducer and two rigid cylindrical shells arranged at two ends of the III flextensional transducer, wherein the two cylindrical shells and a concave cylindrical radiant plate of the III flextensional transducer form a Helmholtz resonant cavity. According to the invention, two kinds of low-frequency resonance modes commonly used in the underwater acoustic transducer are utilized, namely, a fluid cavity resonance mode and a bending resonance mode, and broadband transmission can be formed by coupling the two kinds of vibration, so that the transducer is enabled to have the characteristics of small size, low frequency, high power, broadband transmission and the like. The low-frequency broadband Helmholtz underwater acoustic transducer can be applied to the fields of low-frequency active sonar, remote underwater acoustic communication, low-frequency underwater acoustic experiments, marine environment monitoring and the like.

A family of Radar energy Absorbing Deformable Low Drag Vortex Generators (RAD-LDVG) is described herein. This family of devices are fabricated in such a way that it can conform to aircraft surface features while reducing radar returns from structural details. Vortex generators (VGs) are typically used to reattach or smooth gross flowfields over aircraft surfaces. By doing so, an airfoil or wing can maintain attached flow at higher angles of attack and/or higher lift coefficients than one without the VGs. These devices are also used to reattach and/or smooth flows that encounter crossflow-induced instabilities and/or adverse pressure gradients on the upper surfaces of wings or near aircraft boattails. Other uses include reduction of buffet, vibration, flutter, cavity resonance or general bluff-body pressure drag reduction. Although conventional rigid VGs do generate vortical aerodynamic structures, two major problems are often experienced: i.) the inability to conform to curved surfaces, ii.) the generation of radar cross-section spikes produced by the VGs themselves.

The invention provides an OLED (organic light emitting diode) device package structure and a method for manufacturing the same. The method includes forming an organic layer with regular array structures on an OLED component by the aid of mold plates with array protrusions; sequentially forming a protective layer, a barrier layer, a stress layer and a flat layer by the aid of further deposition processes; forming protrusions with regular array structures on the flat layer. The OLED device package structure and the method have the advantages that internal total reflection effects and micro-cavity resonance effects of an OLED device can be reduced by the aid of refraction effects of the protrusions and various film layers, and accordingly the light emergent efficiency of the OLED device can be improved; the protective layer can protect the array structures of the organic layer against being damaged; the barrier layer can prevent the OLED device from being eroded by water and oxygen, and accordingly the quality of the OLED device can be further improved; the OLED device can be normally used even in certain curled and bent states owing to the stress layer.

A smart bottle comprising a lid and container body includes an actuator, a drinking interface, a sensor including a microphone, a processor including an antenna and a battery disposed in the smart bottle. The smart bottle utilizes the various components to perform acoustic measurements of a resonating cavity to measure liquid consumption of a user in one or more drink events.

Cavity resonance is prevented from being produced in a microphone case by strong electromagnetic waves of a cellular phone level in a boundary microphone provided with a flat microphone case having a relatively large internal space. In the boundary microphone including the microphone case 1 made up of a flat metallic base part 10 the upper surface of which is open and a metallic microphone cover 20 having a large number of openings (sound wave introduction holes), which is attached to the base part 10 so as to cover the upper surface of the base part 10, in which at least a microphone unit 31 and a circuit board 30 on which a predetermined electric circuit is formed are housed in the microphone case 1, the space in the microphone case 1 is filled with a filler (for example, a metallic wool material or a conductive sponge material) 50 having electric conductivity, permeability, and elasticity in combination.

Methods and structures for providing single-color or multi-color photo-detectors leveraging cavity resonance for performance benefits. In one example, a radiation detector (110) includes a semiconductor absorber layer (210, 410A, 410B, 610, 810, 1010, 1030, 1210, 1230) having a first electrical conductivity type and an energy bandgap responsive to radiation in a first spectral region, a semiconductor collector layer (220, 630, 830, 1020, 1040) coupled to the absorber layer (210, 410A, 41013, 610, 810, 1010, 1030, 1210, 1230) and having a second electrical conductivity type, and a resonant cavity coupled to the collector layer (220, 630, 830, 1020, 1040) and having a first mirror (240) and a second mirror (245).

The invention relates to a laser frequency converting, scanning and locking technology, in particular to a double-wavelength external cavity resonance laser frequency converting device with a tunable wavelength, solving the problem that a device capable of scanning the output frequency of frequency converting laser obtained on the basis of a double-wavelength external cavity resonance technology is not proposed at present. The double-wavelength external cavity resonance laser frequency converting device with a tunable wavelength comprises a function generator, a first laser arranged at a signal output end of the function generator, a first matched lens, a first 1/2 wave plate, a second laser, a second matched lens, a second 1/2 wave plate, a non-linear crystal and a 8-shaped annular cavity. The invention solves the problem that a device capable of scanning the output frequency of frequency converting laser obtained based on the double-wavelength external cavity resonance technology is not proposed at present, and a method and the device of the invention are suitable for various converting processes of various frequency including sum frequency, frequency multiplication, difference frequency, and the like.

A package structure for a wireless communication module is disclosed and includes: a substrate having an upper surface defining a supporting region, an annular ground pad surrounding the supporting region, and at least one auxiliary ground pad formed in the supporting region; at least one chip mounted on the supporting region and electrically connected to the substrate; and a shielding lid having a receiving space for receiving the chip, a ground end surface electrically connected to the annular ground pad of the substrate, and at least one auxiliary ground portion electrically connected to the auxiliary ground pad for forming at least one auxiliary ground pathway to adjust the characteristic of the enhanced peak generated by the cavity-resonance effect of the shielding lid. Thus, the enhanced peak can be shifted out of a regulated frequency range of the EMI shielding test, so that the yield thereof can be increased.

The invention discloses a method and a device for realizing wave absorbing of graphene at a visible light waveband, and belongs to the field of photoelectric detection and micro-nano optical, mechanical and electrical systems. A multi-groove structure provided by the invention is a periodic micro-structure, a primitive cell (a basic unit of the structure) of the periodic micro-structure is formedby a plurality of narrow metal grooves with the same width and different depths, a dielectric coating layer is filled into the grooves and above the grooves, and the graphene is deposited above the dielectric coating layer. For TM polar incident light waves, due to a cavity resonance effect of the grooves, the grooves with different depths correspond to different graphene light absorption wavelengths, and broadband absorption of the graphene at the visible light waveband can be realized through combination of the grooves with the different depths. In addition, an absorption spectrum of a waveabsorber is insensitive to the change of an incident angle, and even the incident angle is obviously changed, the graphene still has excellent broadband light absorption performance; and the method and the device have an application prospect in the fields such as light modulators, solar cells, touch screens, biological sensing and the like.

The invention discloses a Fabry-Perot resonator cavity resonance luminescence cantilever beam system. The system mainly consists of an photoelectric conversion component, a substrate, a fixed Fabry-Perot resonator cavity mirror, a resonator cavity inner light source, a sample chamber, a movable Fabry-Perot resonator cavity mirror, a resonator cavity outer light source, upper piezoelectric ceramics for excitation, a silicon micro-cantilever beam, lower piezoelectric ceramics for excitation and a probe. The Fabry-Perot resonator cavity resonance luminescence cantilever beam system can emit variable resonance frequency light which is modulated by vibration; and can detect spectral components of samples to be detected and cantilever beam flexure and deformation ability which is caused by external factors. Furthermore, the system can be applied to various technical fields, such as sensing and detection of chemical constituents and molecular biosamples, measurement of ultra-precision mechanical surface contour, physical spectrum constituent analysis and the like.

A pneumatic tire provided with a noise damper in the tire cavity, which can maintain high-speed durability and productivity while also reducing cavity resonance, comprising a tread having a width TW in contact with the ground during travel, in which a noise damper made of a sound-absorbing material is attached to the tire internal surface in order to reduce cavity resonance, wherein the noise damper is at least one continuous ribbon made of a sound-absorbing material and having a width W and a thickness E, which is fixed over an attachment width Wc to the tire internal surface over a range of at least 30% of the inside of the tread in the radial direction, the start end and terminal end which are the two ends of the continuous ribbon are disposed in such a way as to be offset from each other in the axial direction, and the continuous ribbon forms, together with the tire internal surface, a continuous groove having a groove width D which is at least equal to 10% of the width W of the continuous ribbon.

The invention provides a loudspeaker box. The loudspeaker box comprises a shell and a loudspeaker unit which is contained in a shell. The loudspeaker unit comprises a diaphragm for vibration to produce sound. The diaphragm and the shell are spaced to form a front sound cavity. The loudspeaker box also comprises a sound outlet channel by which the front sound cavity and the outside world are communicated. The front sound cavity and the sound outlet channel form a front cavity of the loudspeaker box. The loudspeaker box also comprises a through hole formed corresponding to the front cavity area, a plurality of mounting holes arranged around the periphery of the through hole, and an elastic cover plate which covers the through hole. A plurality of columnar connecting elements stretch from the elastic cover plate and face the inner surface of the front cavity. The mounting holes and the columnar connecting elements are in one-to-one correspondence and matching connection. The Young modulus or strength of the elastic cover plate is smaller than the Young modulus or strength of the shell. According to the loudspeaker box provided by the invention, the front cavity resonance can be weakened, a resonance peak can be reduced, and the distortion is improved.

Provided is a metal casing structure capable of avoiding a cavity resonance at 10 GHz and 20 GHz by controlling an eigenmode frequency in an inner space of a casing without involving an increase in cost, and a 10 Gbit/s optical transceiver module which achieves reduction in unnecessary electromagnetic waves and cost. In the optical transceiver module, a metal casing having a cavity therein is formed by an upper casing (100) and a lower casing (101), a metal partition wall (103, 104) is provided on at least one of the upper casing (100) and the lower casing (101) near a central portion of the casing in a direction parallel to a direction connecting a front and a rear thereof, and a length of a gap between the partition wall (103, 104) and a printed circuit board (102) is adjusted.

The invention relates to a selection surface for three-band high performance frequency based on adjacent unit perturbance. The traditional selection surface has low selectivity, bad performance stability, as well as large volume. Two sides of a medium substrate of the invention are plated with metal layers, the whole medium substrate is opened with multiple groups of metal through holes arranged as squares with different sizes, so as to form multiple groups of integrated waveguide cavities with adjacent high-frequency and low-frequency substrates. An upper metal layer and a lower metal layer of the corresponding cavity are etched with square annular gaps with same high-frequency and low-frequency; compared with the common dual frequency band frequency selection surface composed by two periodic patches or gaps with different sizes, because the new structure introduces the cavity resonance mode, thereby realizing the characteristic of single side sudden drop of pass-band, and greatly improving the selection characteristic of pass-band, meanwhile, conveniently realizing the selection surface of multi pass-band frequencies with ultra-narrow frequency intervals, and the performance has good stability to incident wave angle and polarizability.