70 results about "Frequency effect" patented technology

Acoustic sensing utilizing a cantilever structure coupled about at least one side of said cantilever to a base substrate, wherein said cantilever includes a piezoelectric section and has at least one acoustic wave device on a portion of the cantilever, wherein a flexure of the cantilever produces force-frequency effects measurable by the acoustic wave device. According to one embodiment, the cantilever sensor uses the flexure-frequency effect as measured by an acoustic wave device to sense a target matter. According to one embodiment, a sensing material is disposed on at least a portion of at least one surface of the cantilever.

A means is provided to estimate the amount of frequency deviation experienced in a precision resonator resulting from the effects of previous thermal history, acceleration, or aging by determining the differential effect of the perturbing condition on different resonant modes in the same resonator or on different resonators exposed to the same environment. The measurements may be made simultaneously, or sequentially against an independent frequency source. Residual frequency hysteresis effects may be determined in connection with an independent temperature sensor if the exact temperature in not known.

The invention relates to a high-speed calculation correlated imaging system and method based on a preset modulatable light source.The imaging system comprises the light source, an electro-optical modulator array modulating system, a single-point light intensity detector, a data collecting module and a data synchronizing and processing module; the electro-optical modulator array modulating system is used for performing random binary intensity modulation on light emitted by the light source to form a light field with intensity distributed in a random fluctuation mode in free space; the single-point light intensity detector is used for detecting total light intensity obtained after the light field is reflected or transmitted by a target object to be detected and converting the total light intensity into electric signals related to the total light intensity; the data collecting module is used for obtaining the electric signals and obtaining total light intensity fluctuation information, the data synchronizing and processing module is used for controlling data synchronization between the electro-optical modulator array modulating system and the data collecting module and then conducting correlation calculation to obtain an image of the target object to be detected.The electro-optical modulator array modulating system is used for modulating light, the modulation speed is high, the refreshing frequency effect of the preset light source is improved, the refreshing frequency is at least improved to megahertz order, and imaging result and imaging quality are improved.

The present invention provides a multilayered chip capacitor (MLCC) comprising internal electrodes and external electrodes formed to be perpendicular to the internal electrodes, whereby parasitic capacitance is reduced, resulting in no parallel resonance frequency effects. In addition, the MLCC has a capacitor structure, which provides a first surface and a second surface formed in a stacking direction of the dielectric layers in the capacitor body as a top surface and a bottom surface. Hence, in the thin capacitors having the same size, the number of internal electrode layers is increased, thereby reducing the ESR and ESL. Further, the PCB having an embedded MLCC is easily manufactured.

The invention discloses a medical B-ultrasound front-end excitation device, comprising a FPGA-based transmitted beam main control unit, a multi-channel high-voltage switch circuit, a level conversion and high-voltage driving pulse circuit, a high-voltage excitation generating circuit, an isolation diode bridge and the control signal circuit thereof. In the invention, an apodization bipolar transmission circuit is adopted, thereby overcoming the characteristics of the beam and the limitation of the spectrum transmitted by the traditional B-ultrasound front-end system which uses unipolar high-voltage pulse. By using a energy distribution apodization excitation technology which is near Gaussian shape, the characteristics and side lobe suppression of the transmitted beam are effectively improved; thereby not only improving the utilization of transmission energy, but also effectively improving the detection penetration when the transmission high-pressure is unchanged. The excitation device can obtain obvious variable frequency effect, and improve the image resolution, so that the image is more uniform and finer, and the overall performance of the system is enhanced.

The invention discloses a sub-ultrasonic high-frequency fatigue testing machine. An energy converter used as a driving force source, the energy converter, a tested sample and a driven amplitude transformer form a resonance system, and a prearranged static loading mechanism provides static load for a test piece. The energy converter can be a full-wavelength energy converter or a half-wavelength energy converter. The energy converter converts an electric signal into mechanical vibration under the driving of an external alternating voltage, so the whole system is in a resonance state, and the tested sample has resonance vibration and a stress, thereby the fatigue detection can be realized. The energy converter can be a piezoelectric energy converter or a giant magnetostrictive energy converter. The sub-ultrasonic high-frequency fatigue testing machine allows the sub-ultrasonic high-frequency fatigue tests of the test piece under different stress ratios to be carried out according to the system prearrangement state; compared with traditional high-frequency fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantages of simple structure, small volume, test period shortening, high efficiency and energy saving; and compared with present ultrasonic fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantage of reduction of the frequency effect and the dimension effect to the material fatigue performances.

Provided are a pilot frequency scheduling method for a multiple-input-multiple-output system, and a cooperative device. The method comprises: determining an initial user sequence; according to the initial user sequence, conducting tabu search so as to obtain an optimized user sequence; and according to the optimized user sequence, conducting pilot frequency scheduling on UEs in L cells, wherein UEs of the same user combination belonging to the optimized user sequence in the L cells share the same section of pilot sequence. In the embodiments of the present invention, by searching for a plurality of user combinations of the L cells so as to obtain an optimized user sequence of the L cells and conducting pilot frequency scheduling on UEs of the L cells according to the optimized user sequence, a good pilot frequency scheduling effect can be obtained in the case where the algorithm complexity is relatively low, thereby taking account of the calculation overhead and comprehensive pilot frequency effect of a multiple-input-multiple-output system in balance.

The invention discloses a compact type optical difference-frequency THz source, which comprises a dual-wavelength laser and a difference-frequency device, wherein the dual-wavelength laser and the difference-frequency device are sequentially arranged. The dual-wavelength laser comprises a pump source, a laser reflective mirror, a laser crystal, a Q switch and a laser output mirror, wherein the above parts are arranged in turn. The difference-frequency device comprises a laser focusing lens and a difference frequency crystal, wherein the laser focusing lens and the difference frequency crystal are arranged in turn. The pump laser emitted by the pump source is injected into the laser crystal. Through the energy level transition process, activated particles inside the laser crystal are transited into the upper level to generate the laser oscillation inside an oscillation cavity formed by the laser reflective mirror and the laser output mirror. The laser crystal is composed of two crystals used for generating the laser oscillation at two wavelengths. By means of the Q switch, the loss of the oscillation cavity is adjusted, so that the pulse laser can be outputted. The outputted laser is injected into the difference frequency crystal after being focused through the laser focusing lens to generate the difference frequency effect, generate and output terahertz waves. The compact type optical difference-frequency THz source is compact in structure, and can be applied to small-cost, miniaturized and portable demand scenarios.

The invention discloses a broad-tuning waveguide terahertz radiation source. The broad-tuning waveguide terahertz radiation source comprises a laser pump source, a dual-wavelength parametric oscillator, a cylindrical lens and a panel waveguide, wherein the laser pump source outputs 532nm Q-switched pulses to the dual-wavelength parametric oscillator, the dual-wavelength parametric oscillator generates dual-wavelength pulses which are within the range, wherein the center of the range is a degeneracy point, and the radius of the range is 1064nm, the dual-wavelength pulses are focused through the cylindrical lens, and are coupled to a core layer of the panel waveguide, narrow-linewidth THz waves are generated through the second-order non-linear difference frequency effect, a THz radiation mode is generated through the Cherenkov phase matching mode, and sidewise coupling output is achieved. Due to the fact that the structure is adopted, the tuning range is expanded, broadband tuning within the range from 0.1THz to 7THz can be achieved, high-efficiency coupling of the THz waves is achieved, coherent THz radiation output with broad tuning and the narrow linewidth is finally achieved, and the broad-tuning waveguide terahertz radiation source can be widely applied to the fields such as the biomedicine imaging field, the high-resolution spectral analysis field, the material detection field and the medical diagnosis field.

The invention relates to a terahertz radiation source based on intracavity optical parameters and a difference frequency effect. The terahertz radiation source comprises a pump light source, a first KTP crystal 9, a second KTP crystal 10 and a periodically poled crystal 12. The pump light source is an optical parametric oscillator composed of the two KTP crystals, two beams of difference frequency light are generated and enter the periodically poled crystal 12, and terahertz waves are generated in a difference frequency light resonant cavity on the basis of the optical difference frequency effect. The two beams of difference frequency light can each serve as pump light to motivate the periodically poled crystal 12, a cascaded optical parameter effect occurs in the difference frequency light resonant cavity, and the terahertz waves are generated. In the whole terahertz wave generation process, the difference frequency light can motivate the periodically poled crystal 12, and the terahertz waves are generated under the cascaded optical parameter effect; one pump photon can generate multiple terahertz photons, and terahertz wave output energy and optical conversion efficiency are effectively improved.

The invention discloses a Terahertz radiation source based on an optical parameter effect and an optical difference frequency effect. The Terahertz radiation source comprises a pumping source, a telescope beam shrinking system, a first reflecting mirror, a first optical beam scanner, a resonant cavity consisting of two optical glasses, a reflecting mirror group and a second optical beam scanner. A MgO:LiNbO3 crystal is arranged in the resonant cavity, and a silicon prism is arranged on the side face of the MgO:LiNbO3 crystal. The Terahertz radiation source is simple in structure, and the parameter process and the difference frequency process can be achieved at the same time in the low-cost MgO:LiNbO3 crystal. The acquiring mode of two difference frequency beams in the difference frequency process is simple, and the entire system is compact in structure, good in stability and low in cost. The incident angle of pumping light is changed by changing the direction of the optical beam scanners, so that the included angle of the pumping light and the axis of a Stokes optical resonant cavity is changed, and thus frequency tuning output of THz waves can be achieved. The tuning mode is simple, and operation is flexible. The pumping light is recycled, due to the fact that the optical parameter process and the optical difference frequency process are achieved at the same time, the output power of the THz waves can be effectively improved, and the optical conversion efficiency of the THz waves is improved.

The invention discloses a frequency stabilization type photoproduction microwave signal source based on an optical microcavity, and relates to the field of optical communication devices. The frequency stabilization type photoproduction microwave signal source comprises an optical loop and an optical coupler, wherein the optical loop is mainly composed of the optical microcavity, a band-pass filter, an optical amplifier and an optical coupler. The optical microcavity is used for forming periodic comb filtering with fixed frequency space; the band-pass filter is used for selecting two optical signals with adjacent frequencies from multi-frequency optical signals output from the optical microcavity; the optical amplifier is used for generating optical power gains in the optical loop, achieving hot shooting of the two optical signals with the adjacent frequencies, and forming double-frequency lasers; the optical coupler is used for outputting part of optical power coupling of the double-frequency lasers; a photoelectric detector is used for receiving the double-frequency lasers output by the optical couplers and obtaining photoproduction microwave signals with an optical beat frequency effect. By means of the frequency stabilization type photoproduction microwave signal source, the frequency stability of the microwave signals is improved, and the phase noise of the photoproduction microwave signals is restrained.

The invention provides a method for implementing multi-azimuth electromagnetic wave low-frequency conversion by using a Dirac point difference frequency effect. A beam of waves with Dirac point frequency illuminates a photonic crystal array along the vertical direction; another beam of waves without Dirac point frequency penetrates in the photonic crystal array along different directions and is in a transmission state; the two beams of waves are superposed in the photonic crystal array so that difference frequency oscillation is caused; light wave energy is re-distributed; two beams of waves are converted into two beams of low-frequency signals with the same frequency along different azimuths under the effect of a difference frequency effect; and the two beams of low-frequency signals are transmitted outwards. By the method, the difference frequency effect is achieved by two beams of high-frequency incident light coming from different azimuths creatively, multi-azimuth low-frequency outgoing waves with the same frequency are obtained, and a machining process is simplified. The method has the advantages of low loss, low cost, high conversion efficiency, easiness and convenience in operation and the like, and is suitable for performing low-frequency oscillation conversion on any materials with Dirac point characteristics. Electromagnetic waves and sound waves which correspond to photonic crystal energy band structures are in a frequency conversion range.

The invention relates to a multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment. The method is operated in a multi-user relay communication system based on NOMA and SWIPT cognitive radio environment and comprises a main user PU, m relays R1 to Rm, two secondary user sending ends ST1 and ST2 and a secondary user receiving end SR, and the main user PU is in a communication state all the time; and the number of accessible system users is increased, and the frequency effect and the energy efficiency of the system are improved. A traversal optimal solution solving method is adopted, a complex non-convex problem is converted into a linear programming problem easy to solve, and finally the reachable rate of weak users in the secondary network is maximized.

A method for adding sound effect process function of a Bluetooth stereo device is provided in the present invention, adding a digital signal process technology to the Bluetooth stereo device and adding a sound effect process module for processing stereo sound source series flow, adding special sound effect series flow into the form of the sound source series flow after subband coding (Subband coding, SBC) decoding received by the Bluetooth stereo device, sound effect process function containing super bass process function, sound effect simulating various sound fields and process function of the dynamic equalizer, wherein the super bass process bases on using human ear lost basic frequency effect, and the simulating various sound fields bases on the rebound of sound in space, sound positioning process technology and sound effect simulating technology etc., leading the stereo sound effect to be perfect while process sound effect process.

The invention discloses an ultra-short-pulse laser frequency-doubled continuous attenuator, which comprises an optical system, a liquid crystal modulator, a liquid crystal voltage control system, a focusing device and a frequency-doubled crystal. The optical system is used for performing beam expanding on an ultra-short-pulse laser and dividing the laser into at least four beams of parallel light; the liquid crystal modulator is used for performing phase modulation on one beam of parallel light; the liquid crystal voltage control system is used for adjusting voltage applied to the liquid crystal modulator; and the focusing device and the frequency-doubled crystal are used for performing focusing and frequency doubling on the modulated parallel light. In the ultra-short-pulse laser frequency-doubled continuous attenuator, the sum frequency effect of the ultra-short-pulse laser is utilized to modulate frequency-doubled light intensity thereof; and in the process of generating frequency-doubled light by the ultra-short-pulse laser, the frequency-doubled efficiency in the frequency-doubled crystal is controlled so as to realize continuous modulation on the frequency-doubled light intensity of the ultra-short-pulse laser. The ultra-short-pulse laser frequency-doubled continuous attenuator has the advantages of simple structure, capability of preventing the pulse widths and shapes of pulsed light from being changed, uniform light spot quality, no damage to attenuation devices and capability of performing continuous adjustment on the strength of ultra-short pulses.

The invention discloses a laser phase modulation method capable of effectively suppressing an amplitude frequency effect. The laser phase modulation method comprises the following steps: (a) firstly, inputting single-frequency continuous laser generated by a single-longitudinal-mode laser to an amplitude modulator; (b) secondly, loading a microwave signal source to the amplitude modulator, and performing amplitude modulation on a direct current voltage source; (c) thirdly, inputting single-frequency pulse light output by the amplitude modulator to a phase modulator for spectrum widening; (d) finally, loading modulation of a non-sinusoidal radio frequency signal source to the phase modulator to obtain a Gaussian spectrum light pulse, wherein the non-sinusoidal radio frequency signal source is formed by reshaping a sinusoidal radio frequency signal proportionally. According to the laser phase modulation method capable of effectively suppressing the amplitude frequency effect, provided by the invention, the modulation of the non-sinusoidal radio frequency signal source is loaded to the phase modulator to obtain the Gaussian light pulse, so that the amplitude frequency effect after transmission and amplification can be better suppressed, and the flatness of spectral lines output by a system is greatly improved.

The present invention proposes a simulation method for the working effect of frequency equipment in a virtual complex electromagnetic environment, which can quickly build a virtual complex electromagnetic environment close to actual combat in the simulation software system, and carry out communication confrontation training and radar in complex electromagnetic environments for troops. Confrontation training, etc. provide a simulation training environment similar to actual combat. It can also reduce the link of preprocessing the electromagnetic information sent by the frequency-using equipment (electromagnetic radiation source) distributed in the entire combat space, simplify the procedures and steps of constructing the virtual complex electromagnetic environment, reduce the utilization rate of memory, and improve the efficiency of the virtual complex electromagnetic environment. Calculation efficiency of environmental influence on frequency equipment.

The invention relates to a visible light communication color shift keying modulation method based on multi- pulse positions. According to the method, a method integrated with multi- pulse position combinations and color shift keying modulation is applied to visible light communication modulation for the first time, and the position combination identification problem of the color shift keying modulation when not all of three colour lights transmit power is solved. According to the method, artificial pseudo-noise acts in identifying the time slot pulse position combinations of the three colour lights, and in a symbol cycle, the light colours tend to be white light. According to the pulse time slot position combinations of multi-color lights introduced into the method, information can be transmitted through different pulse time slot position combinations of the three colour lights. Compared with traditional color shift keying and pulse position modulation, the method has the advantage that the frequency effect is at least doubled. Utilization of the artificial pseudo-noise in the method is that judgment is carried out based on a maximum likelihood estimation algorithm, and through adoption of dual-threshold judgment, the system has relatively good anti-interference performance.

The invention discloses a supercontinuum variable frequency laser based on PPLN crystals. The laser is composed of a near infrared supercontinuum pumping source, a lens group, PPLN crystals, a temperature control system, a precision adjusting frame and an off-axis parabolic reflector; the lens group is a collimation focusing system formed by a first lens and a second lens; the output end of the near infrared supercontinuum pumping source is located at the focus of the incident surface of the first lens; the PPLN crystals are located in the temperature control system, and the incident end faceis located at the focus of the incident surface of the second lens; the focus of the off-axis parabolic reflector is located at the focus of the incident surface of the second lens, and a center smallhole is coaxial with the output end of the near infrared supercontinuum pumping source, the center of the first lens, the center of the second lens and the centers of the PPLN crystals. According tothe laser, output optical spectrum simultaneously covering visible light, near infrared and middle infrared wave ranges can be achieved by using the near infrared supercontinuum pumping source, the double frequency, sum frequency and difference frequency effects among the PPLN crystals, self-phase position modulation and a stimulated Raman scattering effect. The structure of the laser is compact and the adjustment is simple.

The invention provides a hybrid pre-coding optimization method based on a millimeter wave massive-MIMO (Multiple-Input Multiple-Output) system. The method comprises the following steps: step S1: establishing a hybrid pre-coding MIMO model based on GMD (Geometric Mean Decomposition); step S2: establishing a Saleh-Valenzuela millimeter wave channel model; step S3: obtaining a system frequency effectformula in a downlink transmission scene of a single user in a single cell of the millimeter wave massive-MIMO system; step S4: performing conversion on the GMD by using an SVD (Singular Value Decomposition) mode; step S5: obtaining a system frequency effect optimized objective function analysis formula based on the GMD; step S6: obtaining an optimized objective function; step S7: determining ananalog pre-coding scheme according to the optimized objective function; and step S8: configuring the millimeter wave massive-MIMO system. The hybrid pre-coding optimization method based on the millimeter wave massive-MIMO system provided by the invention utilizes the GMD mode to decompose a channel into equal-gain sub-channels, so as to simplify the coding and decoding complexity, reduce the system coding and decoding complexity, and improve the system frequency effect.

A system and method for relieving high blood sugar factor of diabetes includes an electric energy wave generator with a frequency effect level control formulation. The frequency effect level control formulation includes a control of a single frequency effect level and a control of a multi-frequency modulation effect level and controls and emits a single frequency electric energy wave to a diabetic patient's body in the single frequency effect level according to the frequency effect level control formulation and controls and emits a multi-frequency electric energy wave in a multi-frequency modulation effect level, so as to reduce and eliminate a high blood sugar factor of the diabetic patient's body by the electric energy wave.

A beat frequency cancellation circuit, for an amplifier, includes a coupling device connected between two signal processing paths of the amplifier for compensating for beat frequency effects of output signals between the signal processing paths.

The invention discloses a crystalless metering SoC chip and a clock acquisition method thereof. The method comprises: receiving training bytes sent by an external main control MCU through a serial port UART; Count the time interval Tref between two falling edges to obtain the count value Nrc; use Fideal and Nrc to calculate the estimated baud rate Fibaud of the training byte sent by the external master MCU, and obtain the training byte sent by the external master MCU by looking up the table The actual baud rate Fbaud, the time interval Tref is obtained according to Fbaud; the actual clock frequency Frc of the RC clock module is calculated by using Nrc and Tref, and the clock frequency of the RC clock module is adjusted according to the difference between Frc and the preset clock frequency Fideal to obtain the RC clock The adjusted clock frequency Frcc of the module. The method realizes that the crystal-free metering SoC chip itself can obtain the clock frequency without using an external crystal to provide the clock frequency, thereby reducing the system cost and improving the reliability of obtaining the clock frequency.

The invention relates to a power scheduling driving cabin cruise simulation method and system. The method comprises the steps that a driving cabin simulation teaching plan is firstly established, and load flow information, topological information, parameter information and graphic information for power grid operation are stored in the driving cabin simulation teaching plan; then load flow calculation is performed on the load flow information, the topological information and the parameter information, frequency calculation with the fixed step is performed by adopting an alternating algorithm after load flow dynamic calculation and new power grid load flow injection after frequency effect influence is calculated so as to perform the next time of load flow calculation and frequency calculation; results of load flow calculation and frequency calculation and the corresponding graphic information in the driving cabin simulation teaching plan are sent to a power scheduling driving cabin simulation state; a simulation cruise is completed by a data analysis processing module and a main interface of the power scheduling driving cabin simulation state; and a trainer operating stand is arranged so that the load flow information or the topological information of the power grid are updated. The method provides an important means for enhancing level of business via repeated work practice to scheduling personnel.

C20H18N2O2 nonlinear optical crystal and preparation method and application thereof. The crystal does not have a center of symmetry, belongs to an orthorhombic system, and has space group Pna21 and cell parameters as below. The crystal can be grown by a spontaneous crystallization evaporation method and a spontaneous crystallization cooling method, has the characteristics of fast growth and low cost; and high-quality crystals with large size are easy to grow. The obtained C20H18N2O2 crystal has the advantages of large nonlinear optical effect, powder-fold frequency effect intensity of 2-3 times OH1, chemical stability and no deliquescence, suits the need of infrared band laser frequency conversion, and can be used to produce non-linear optical device, such as a device which uses at least one beam incident electromagnetic radiation passing through at least one C20H18N2O2 nonlinear optical crystal and generates at least one bundle of output radiation with frequency different from that of the incident electromagnetic radiation.