59results about How to "Broadband" patented technology

The invention provides a magnetic drive peak force modulated atomic force microscope and a multi-parameter synchronous measurement method thereof, relates to the technology of measurement of the material surface topography and mechanical properties under the micro-nano scale, and aims at solving the problems that the driving frequency range of the probe in the conventional method based on the force-displacement curve is limited and integrally driving the probe interferes the movement of the probe cantilever and influences the measurement accuracy under the liquid environment. A coil is arranged in a sample table. The probe tip is provided with magnetic particles which are magnetized along the length direction of the probe or have the magnetized component of the direction. Firstly the PSD voltage curve U<free> of vibration of the probe in the free state is acquired, then the PSD voltage curve U<inden> of the tip position when the probe intermittently contacts the sample is acquired, the voltage curve U<Force> of the probe under stress is acquired by U<free> and U<inden>, and the force-displacement curve is acquired according to all the curves so as to acquire the mechanical properties of the material through combination of the corresponding contact mechanical model. The driving frequency range of the probe is wide and the measurement accuracy is high so as to be suitable for the research of polymer composite material or biological cells.

The invention relates to a non-contact transmission friction-electromagnetic composite wave energy collector adapted to complex excitation. The device collector comprises a floating ball, a rocker, alifting rod and a frequency-increasing electromagnetic power generation assembly, the floating ball is rigidly connected with the top of the rocker; the bottom end of the rocker is connected with thelifting rod through a universal joint; an electret rolling ball capable of rolling is arranged in the floating ball; a metal pole I and a metal pole II are arranged on the lower surface in the floating ball; the lifting rod is arranged in a lifting sleeve; a spring is arranged between the lifting rod and the lifting sleeve; a driving permanent magnet combination is arranged on the lifting rod; thelower end of the lifting sleeve is connected with a frequency-increasing electromagnetic power generation assembly, the frequency-increasing electromagnetic power generation assembly is provided witha driven permanent magnet combination, the driving permanent magnet combination is in magnetic coupling connection with the driven permanent magnet combination, the driven permanent magnet combination is in mechanical transmission connection with a power generation permanent magnet, and the power generation permanent magnet is correspondingly provided with a power generation induction coil. The collector can effectively work in a marine all-weather climate environment, adapts to complex wave excitation, and has a frequency increasing function and high reliability.

The invention discloses a piezoelectric composite material for a broadband transducer, and belongs to the technical field of the piezoelectric material. The piezoelectric composite material comprises a piezoelectric crystal and polymers; wherein, the piezoelectric crystal is divided into an upper part and a lower part; the upper part of the piezoelectric crystal is provided with a plurality of piezoelectric crystal pillars which are uniformly arranged; the lower part of the piezoelectric crystal is a piezoelectric substrate; the heights of the piezoelectric crystal pillars present periodical differences, so that the thickness of the substrate is not uniform; the polymers are filled between the piezoelectric crystal pillars; and the polarization direction of the piezoelectric crystal pillars and the piezoelectric substrate is along the thickness direction of the piezoelectric composite material. Due to the different resonance frequencies of the piezoelectric crystalline pillars, the bandwidth of the piezoelectric composite material can be increased by changing the heights of the piezoelectric crystal pillars. The Q value of the piezoelectric composite material can reach below 10, and the composite material is applicable to the preparation of the broadband transducer.

The invention discloses an impedance transformer network circuit structure. Three JFET tubes are cascaded to form a source follower, two triodes are cascaded to form a buffer, the input capacitance of the source follower and the output capacitance of the buffer can be reduced, the bandwidth is increased at the same time, the external interference is reduced, the isolation degrees between channels is improved, and the occurrence of high-frequency oscillation is inhibited.

The invention relates to an optical system for a star sensor. The optical system is applied to high-precision star sensors. The optical system is of an improved peaceful structure and consists of six lenses, wherein the six lenses are all spherical lenses; an aperture diaphragm is arranged on first glass; the first glass is made of fused quartz, can be used for correcting aberration and can be used as protective glass of the optical system. The optical system has the characteristics of wide spectrum, large visual field, relative large aperture and the like; the distortion is very low in relatively large spectral range and visual fields, concentration ratios of discs of confusion of each visual field are uniformly distributed, and the imaging quality is good. The optical system can work in a temperature range from -40 DEG C to 50 DEG C, has good image quality and defocusing amount at each temperature point and can meet attitude measurement requirements of the high-precision star sensors working at severe space temperature environments.

The invention discloses an ultra-micro capsule material, a preparation method and application thereof. The ultra-micro capsule material is of a core-shell structure; the core-shell structure is composed of rare earth cobalt magnet R2Co17 micron-order particles which are adopted a core and protonated polypyrrole which is adopted as a shell. The preparation process of the ultra-micro capsule material includes the following steps that: a rare earth cobalt magnet R2Co17 block is ground and ball-milled, so that rare earth cobalt magnet R2Co17 micron-order particles can be obtained; the rare earth cobalt magnet R2Co17 micron-order particles are added into protonated pyrrole monomer; and an ammonium persulfate oxidizing agent is added into the protonated pyrrole monomer, and a newly obtained mixture is stirred, so that the ultra-micro capsule material can be obtained. The high-complex magnetic permeability rare earth cobalt magnet and the high-complex permittivity protonated polypyrrole are composited, so that the wave absorbing property of the ultra-micro capsule material in a microwave S-band can be effectively improved.

The invention belongs to the technical field of phase shifters, and particularly relates to an adjustable broadband photonic RF phase shifter based on a highly nonlinear fiber loop. A first continuous wave laser is connected with a signal generator. The signal generator is connected with a first polarization controller through a first erbium-doped fiber amplifier and a first band-pass filter. A second continuous wave laser is connected with a second polarization controller through a second erbium-doped fiber amplifier, a second band-pass filter and an attenuator. The first polarization controller and the second polarization controller are connected with the highly nonlinear fiber ring through a coupler. The highly nonlinear fiber ring is connected to a photodetector through a third erbium-doped fiber amplifier and a third band-pass filter. The photodetector is connected with an oscilloscope. The problems of bandwidth limitation and narrow phase shift tuning range existing in the operation of the conventional radio frequency phase shifter can be solved. The adjustable broadband photonic RF phase shifter based on the highly nonlinear fiber loop is mainly used for photon phase shifting.

The invention discloses a differential linear piezoelectric motor and a working method thereof. A driving foot on a motor stator comprises two groups of symmetric piezoelectric stacking layers parallel with a guide rail, and one group of piezoelectric stacking layers vertical to the guide rail, so as to respectively provide slight vibration in parallel with and vertical to the guide rail direction for the stator driving foot. The differential linear piezoelectric motor has the advantages that by utilizing symmetric periodic signals to excite piezoelectric stacking layer parallel with the guide rail direction, and rectangular wave signals to excite the piezoelectric stacking layer vertical to the guide rail direction, the friction driving characteristic between the motor stator and a rotor has obvious difference between the driving phase and the return phase, so that the movement distance of the motor in the driving phase is greater than the movement distance in the return phase; because the motor has obvious different differential friction characteristic in the frequency range of 0 to 1KHz, when the driving frequency is changed from low frequency to high frequency, the positioning accuracy of the motor is gradually changed from nanometer level to micrometer level, and the macro-micro combined positioning platform with complicated structure may be replaced.

The invention discloses a reflective type wireless optical-fiber communication system. The reflective type wireless optical-fiber communication system comprises a plane mirror, a convex lens, a reflective type modulator, a silicon light cell panel, a demodulation and amplification circuit and a loudspeaker. Sunlight irradiates the plane mirror, plane mirror reflected light forms a convergent light beam through the convex lens, the convergent light beam irradiates the reflective type modulator to form an optical carrier wave of an optical modulation signal, the optical carrier wave irradiates the silicon light cell panel, the silicon light cell panel generates a corresponding electrical signal to be connected to the demodulation and amplification circuit, the signal after demodulation reduction and amplification is connected to the loudspeaker through the demodulation and amplification circuit, and the loudspeaker can play an amplified sound signal. The reflective type wireless optical-fiber communication system has the advantages of low cost, energy conservation, environmental protection, the wide frequency band, simple and flexible erecting, high anti-interference performance, good transmission secrecy performance and the like.

The invention relates to a graphene wave-absorbing metamaterial for an encrypted computer display. The metamaterial structure comprises a plurality of periodically arranged metamaterial structure units, each meta-material structure unit comprises a meta-material structure I and a meta-material structure II. The metamaterial structure I comprises a first conductive layer and a first dielectric layer; the first conductive layer is arranged on the first dielectric layer; the first conductive layer is provided with a double-L-shaped structure which is symmetrical about the center of the metamaterial structure unit. The metamaterial structure II comprises a second conducting layer and a second dielectric layer, the second conducting layer is arranged on the second dielectric layer, the second conducting layer is provided with four L-shaped structures which are symmetrical about the center of the metamaterial structure unit, and the edges of the L-shaped structures are parallel to the edgesof the corresponding metamaterial structure units respectively; the thickness is small, the absorption rate of electromagnetic waves with the working frequency band ranging from 8.25 GHz to 17.35 GHzis higher than 90%, and the average transmittance of visible light bands is 85%; the invention relates to the technical field of electromagnetic protection.

The invention relates to the technical field of dispersion type spectra, in particular to a wide-spectrum high-resolution spectral dispersion method and device. The device comprises a first dispersionsystem, an image slicer, a first light condensation module, a second collimation module, a second dispersion system and a detector which are sequentially arranged along a light path; a point target is introduced into a spectrograph system through an optical fiber, enters the first dispersion system after being collimated for light splitting and is imaged on a plane of the image splitter after being condensed, light of different spectra is split through the image splitter and reflected at different angles, convergence and collimation are achieved, secondary light splitting is performed after the light enters the second dispersion system, and the light is imaged on the face of a detector. Wide-spectrum high-resolution spectral dispersion can be achieved, and the method and device are applicable to the fields of material composition analysis, astronomical optic signal detection, atmosphere wind speed measurement and the like.

The invention relates to a lens structure, a lens antenna and electronic equipment. According to the lens structure, the artificial surface plasmon waveguide can be generated by utilizing a pluralityof pairs of second slots, by setting the gradual change rule of the number of the second slots of an inter-layer or intra-layer slot units, a phase delay distribution rule is obtained to realize a beam convergence function, and the dielectric loss of electromagnetic waves in the waveguide transmission process is low, so that the lens antenna with lower loss, higher efficiency and larger broadbandcan be realized in practical application. In addition, through the dielectric layers and the conductive layers which are alternately laminated, the assembly and preparation of the low-cost lens can berealized.

The invention provides a Fourier overlapping correlation imaging system and method based on computational ghost imaging. The system comprises a spatial filter, a spatial light modulator, an imaging module, a high speed light sensitive array, a processing module which is used for calculating the image of the corresponding position of each single pixel detector and using the image as the low-resolution image of tilted plane wave illumination whose light source is the single pixel detector, and a calculation module. The calculation module is used for carrying out Fourier transforming on the low-resolution image to acquire the move and low-pass filter of a spectrum corresponding to a target high-resolution image at the incident angle and the numerical aperture of the objective lens, splicing the overlapped relevant parts of the spectrum of the low-resolution image to acquire the spectrum of the target high-resolution image, and using a phase recovery algorithm to acquire the target high-resolution image. According to the invention, the image acquisition efficiency of the whole imaging system can be improved; measurement of a wider spectrum than an ordinary array sensor is realized; compression reconstruction of an image is realized; and the rate of single imaging is improved.

The application relates to a lens structure, a lens antenna and electronic equipment. The lens structure can generate artificial surface plasmon waveguides by using multiple pairs of second conductive sheets. By setting the gradual change law of the number of second conductive sheets in the interlayer or intralayer waveguide structure, the phase delay distribution law is obtained to realize the beam Convergence function, and the dielectric loss of the electromagnetic wave along the waveguide is low, so the lens antenna with smaller loss, higher efficiency and wider bandwidth can be realized in practical applications. In addition, by alternately stacking dielectric layers and waveguide layers, low-cost lens assembly can also be achieved.

The invention discloses a multichannel fiber bragg grating chromatic dispersion compensator. Gratings carved on fibers serving as base materials are interleaved amplitude sampling gratings, and the interleaved amplitude sampling gratings comprise multiple grating periods with different central wavelengths in a sampling period; and the gratings with different central wavelengths are written, and when the chirp of the grating periods with different central wavelengths synchronizes, the obtained chirp of spectra is the sum of the chirp of each central wavelength. By utilizing the method, the energy utilization ratio of the gratings can be improved effectively, and a reflecting channel with high energy efficiency is obtained; and the interleaved amplitude sampling gratings have the effect of chromatic dispersion superposition, so that the small chirp of each grating with different central wavelengths occurs so as to obtain large chromatic dispersion and avoid the superimposing phenomenon of the adjacent spectra caused by overlarge chirp coefficients. The invention provides the chromatic dispersion compensator with narrow band, wide broadband and high energy efficiency, and provides a new concept for the design of different grating chromatic dispersion compensators.