50results about How to "Wide spectrum range" patented technology

The invention discloses a tunable fiber F-P cavity filter, which comprises a packaging box (1), a semiconductor refrigeration device (12), a structural block (4), piezoelectric ceramics (10), a temperature measurement element (8), a heat-resistant material (9), a jacket (6), a first optical fiber (2), a second optical fiber (13) and an F-P cavity, wherein the packaging box (1) consists of a metal or ceramic material; the semiconductor refrigeration device (12) is fixed in the packaging box (1); the structural block (4), the piezoelectric ceramics (10), the temperature measurement element (8) and the heat-resistant material (9) are fixed on the semiconductor refrigeration device (12); the jacket (6) is sealed through an epoxy resin pasting material and is fixed on the structural block (4) provided with a spherical through hole; the first optical fiber (2) is fixed in the jacket (6) through a first optical-fiber contact pin (5); the second optical fiber (13) is fixed in the jacket (6) through a second optical-fiber contact pin (7); and the F-P cavity is formed by the first optical fiber (2) and the second optical fiber (13) of which the end faces are coated with films. The tunable fiber F-P filter provided by the invention has the advantages of high resolution, large dynamic range, fast response, stable work and the like, and the performance of the F-P filter is greatly improved.

The invention provides a device and a method used for measuring film thickness. The device comprises a collimating lens, a first half-transmitting half-reflecting mirror, a field lens, a second half-transmitting half-reflecting mirror, a collection optical fibre, a picture sensor, a computer and a beam split unit, wherein the beam split unit is used for carrying out beam split treatment on the light collected by the collection optical fibre so as to obtain light of each wavelength in a separate manner; and the computer is used for obtaining the intensity of the light with different wavelengths so as to obtain the film thickness of an analyte through calculating. The device provided by the invention has the advantages that the beam split unit is used for carrying out beam split treatment on the light collected by the collection optical fibre so as to obtain the light of each wavelength in the separate manner, the spectral range of a sample point of the device used for measuring film thickness is enlarged, and the distinguishability is improved; and furthermore, the quantity and position of the sample points can be controlled in a flexible manner through the position adjustment of an optical fibre probe, so that the flexibility of processing data is improved and the high-precision film thickness measurement is realized.

The invention discloses a light, conducting and shielding composite material and a preparation method thereof. The light, conducting and shielding composite material is composed of fluoroplastic, carbon nano tubes and hollow glass beads in a weight ratio of (20-60):(0.5-20):(0.5-40), wherein the fluoroplastic is foamed, and the carbon nano tubes are arranged in the fluoroplastic and are of a network structure. The preparation method of the light, conducting and shielding composite material comprises the following steps: firstly uniformly mixing the fluoroplastic, an etching phase, the carbon nano tubes and the hollow glass beads, so as to obtain a mixture; then mixing the mixture in a torque rheometer, so as to obtain a mixed material; and then carrying out hot pressing on the mixed material on a plate vulcanization machine, so as to obtain a composite board, then soaking the composite board in a solvent for removing the etching phase, and drying, so as to obtain the target product, namely the light, conducting and shielding composite material. The light, conducting and shielding composite material has the advantages of light weight, reliable electromagnetic shielding performance, good mechanical properties, simple technology, no pollution, low cost and applicability in large-scale industrial production, and can be easily and widely applied to electronic equipment and intensive systems in the fields of spaceflight, aviation, automobiles and the like.

A cable-fault on-line detection device based on a wide-band chaotic signal and a detection method thereof are disclosed. An electrical chaotic source, a power divider, a data acquisition card and a computer are included. An output terminal of the electrical chaotic source is connected to an input terminal of the power divider. An output terminal of the power divider comprises a low power signal output terminal and a high power signal output terminal. The low power signal output terminal is connected to an analog quantity input terminal of the data acquisition card. The high power signal output terminal is connected to an input terminal of a T-shaped connector. One output terminal of the T-shaped connector is connected to the analog quantity input terminal of the data acquisition card. The other output terminal of the T-shaped connector is connected to a detected cable and then is connected to the analog quantity input terminal of the data acquisition card. A digital quantity output terminal of the data acquisition card is connected to an input terminal of the computer. The detection device takes a chaotic signal generated by a single-stage Colpitts circuit as a detection signal. A chaotic signal correlation method is used to measure a fault point of the cable so that cable open circuit point positioning is realized.

The disclosed communication system is capable of simultaneous transmitting full color mixed from lasers in each color with wave band in 1mm - 10nm. Infrared, red, orange, yellow, green, cyan, blue, purple, and ultra violet lasers are as light source of carrier wave for transmission, and light source of local oscillation for reception. Independent mixer is utilized for encoding and hybrid transmission, and prism / grating array / filtering lens are utilized for demodulation so as to realize full spectral communication with mass data stream above trillion bits. The invention is applicable to point-to-point, ring-to-ring, FSO, and each network communication such as battlefield, disaster occasion, special urgency condition etc. or network communication between buildings and metropolitan area network etc.

The invention relates to a power capacitor possessing a noise shield device. The power capacitor possessing a noise shield device comprises a power capacitor and a shell. A bottom of the shell is equipped with a bottom shielding layer. A shape of the bottom shielding layer matches with the shape of the shell bottom. A shell top is provided with a head cover shielding layer. The shape of the head cover shielding layer matches with the shape of the shell top. The bottom shielding layer is installed on the bottom out of the shell or the bottom in the shell. The head cover shielding layer is installed on the top out of the shell or the top in the shell. The bottom shielding layer and the head cover shielding layer are made of foamed aluminium. Materials of the bottom shielding layer and the head cover shielding layer are light and have characteristics of sound absorption and sound insulation, energy absorption and electronic shielding electromagnetic wave. A frequency spectrum scope of the absorbed noise is wide. Ventilation and heat dissipation of the power capacitor can not be influenced. A noise level of the power capacitor can be reduced. A structure is simple and compact. Installation and usage are convenient. A shielding effect is good. A service life is long. Usage costs are low. The power capacitor is safe and reliable.

The invention provides a terahertz spectrum analyzer which comprises a laser, three optical fiber couplers which are a first optical fiber coupler, a third optical fiber coupler and a fourth optical fiber coupler, an optical switch, a frequency shift ring, three optical delay lines which are a second optical delay line, a third optical delay line and a fourth optical delay line, a photoelectric detector, two photoelectric converters with terahertz detection antennas, two terahertz focusing elements and a terahertz optical splitter. In the acceleration of a terahertz electric field, photon-generated carriers are in accelerated motion to generate current which is proportional to the electric field amplitude of a terahertz wave, current is measured respectively, then square and sum are calculated, the radiation power of the terahertz wave is obtained, the frequency of the terahertz wave is obtained from the time sequence of the current, and the spectrum of the terahertz wave can be obtained. The terahertz spectrum analyzer has the advantages of wide spectral range, high spectral resolution and important scientific significance and application value and works at a room temperature.

The invention relates to a compound semiconductor photocatalyst and a preparation method thereof, and particularly relates to a silver sulfide / zinc sulfide compound semiconductor photocatalyst with ultraviolet light catalytic activity and a preparation method thereof. The invention aims at solving the problems of complex preparation method, high production cost, long degradation reaction time and poor catalyst stability of a conventional ZnS compound photocatalyst. The silver sulfide / zinc sulfide compound semiconductor photocatalyst with ultraviolet light catalytic activity is prepared by ZnS powder, deionized water, AgNO3 and hexadecyl trimethyl ammonium bromide. The method comprises the following steps: firstly, mixing the ZnS powder, deionized water, AgNO3 and hexadecyl trimethyl ammonium bromide to obtain gray black solution; secondly, heating at constant temperature for reaction; and thirdly, obtaining the silver sulfide / zinc sulfide compound semiconductor photocatalyst with ultraviolet light catalytic activity through filtering and drying. The preparation method is mainly used for preparing the silver sulfide / zinc sulfide compound semiconductor photocatalyst.

The invention discloses a vehicle position information transmission method based on a relay transmission node. The method comprises the steps that a vehicle-mounted mobile terminal collects vehicle position information and monitors system information sent by a base station; the relay transmission node monitors system information sent by the base station; in response to the monitored system information sent by the base station, the relay transmission node sends a random access preamble to the base station; in response to receiving the random access preamble, by the base station, a random accessresponse is sent to the relay transmission node; in response to receiving the random access response, by the relay transmission node, an RRC connection establishment request message is sent to the base station on the resource indicated by the uplink grant; in response to the received RRC connection establishment request message, the base station sends an RRC connection establishment completion message to the relay transmission node; the monitored system information sent by the base station is responded and a cache state report is sent to the relay transmission node by the vehicle-mounted mobile terminal; and the relay transmission node judges the transmission mode of the relay transmission node.

Embodiments of the invention provide a graphene-based photodetector comprising a graphene nano-belt, a positive electrode, a negative electrode, a positive electrode nano-wire, a negative electrode nano-wire, a positive nano-comb and a negative nano-comb, wherein the positive nano-comb and the negative nano-comb are lapped on the graphene nano-belt, the positive nano-comb is connected to the positive electrode through the positive electrode nano-wire, the negative nano-comb is connected to the negative electrode through the negative electrode nano-wire, each of the positive nano-comb or the negative nano-comb comprises a comb end and a comb body, and the comb end has a cross-sectional width greater than that of the comb body, thereby realizing higher sensitivity and wider spectrum detection range.

The invention provides a monochrome LED for plant illumination and a plant illumination lamp. The monochrome LED for plant illumination includes a substrate, a blue light chip and a fluorescent adhesive layer. The fluorescent adhesive layer includes package adhesive and fluorescent powder mixed in the package adhesive. The fluorescent powder includes fluoride red powder and nitride red powder. Thechemical formula of the fluoride red powder is K<2>Si<x>Mn<1-x>F<6>, wherein 0.05<=x<=0.1. The chemical formula of the nitride red powder is SrEuCa<1-a-b>AlSiN<3>, wherein 0.05<=a<=0.1, and 0.008<=b<=0.08. By mixing the fluoride red powder and the nitride red powder into the fluorescent powder and using the blue light chip to excite the fluorescent powder, monochrome illumination light witha wide spectrum range can be obtained, and monochrome light can be supplemented to plants to promote the growth of plants.

The invention belongs to the technical field of vibration environment testing and particularly relates to a general change-over vibration test clamp for a dynamoelectric vibrator. The general change-over vibration test clamp for a dynamoelectric vibrator comprises an installing plate and a back structure. The front surface of the installing plate is provided with four T-shaped grooves used for connecting with a to-be-tested test product. The four T-shaped grooves are also provided with installing holes. The surface of the installing plate is embedded with an M12 steel sleeve and an M20 steel sleeve. The invention solves the problem that as differences in shape and installing mode of vibration test products are large, some test products cannot be normally installed on the vibration platform, achieves connection between vibration test products of different shapes and installing modes and the vibration platform, supports a serial of vibration tests of vibration test pieces, and has certain versatility. The clamp primary frequency is high, the spectral range for vibration testing is wide, the dynamoelectric vibrator output is effectively reduced, and the practicality is strong.

The invention relates to the technical field of MEMS light modulators, in particular to an MEMS blazed grating light modulator and an array. The shutter type MEMS large-rotation-corner adjustable blazed grating light modulator comprises a silicon substrate, an insulating layer, a movable frame, flexible beams, a grating mirror plane, double-layer comb tooth drive structures, an elastic cantilever beam, a bias voltage exerting device and a plurality of columns, wherein the insulating layer, the movable frame, the flexible beams, the grating mirror plane, the double-layer comb tooth drive structures, the elastic cantilever beam, the bias voltage exerting device and the columns are arranged on the silicon substrate. One side of the grating mirror plane is fixed to the surface of the substrate through supporting beams and two of the columns, and the other side of the grating mirror plane is connected with the movable frame through a deformation beam and driven by the double-layer comb tooth drive structures. The bias voltage exerting device can exert drive voltages at different levels and different frequencies between movable teeth and fixed teeth, and therefore the movable teeth can deflect and move to drive the movable frame, and the movable frame pulls the grating mirror plane to defect through the deformation beam. Due to the structure, an MEMS blazed grating has the advantages of being large in rotation angle, adjustable in continuous analog, good in controllable capacity, high in diffraction efficiency, high in tuning efficiency and capable of preventing adhesion failure.

The invention discloses an optical fiber grating temperature detecting method and a device in the technical field of sensors. The method comprises the steps as follows: first, compositing optical signals in a set optical band to obtain a composite optical signal; then, importing the composite optical signal into an optical fiber grating temperature sensor to get a center wavelength optical signal; next, using an AOTF acousto-optic tunable filter to demodulate the center wavelength optical signal to obtain a demodulated center wavelength optical signal; and finally, working out the temperature measured by the optical fiber grating temperature sensor according to the demodulated center wavelength optical signal. According to the invention, optical signals of a set optical band are provided by a composite light source, and the spectral range of optical signals is expanded; and the AOTF acousto-optic tunable filter is adjusted by a radio frequency drive controller, a demodulated center wavelength signal corresponding to the set band can be extracted from optical signals returned by the optical fiber grating temperature sensor, the spectrum identification range of optical signals is expanded, and the requirements of a large-scale temperature sensing monitoring system can be met.

The dry-type high-frequency high-voltage transformer structure (1) of the present invention is characterized by comprising an EE-type magnetic core (2), a square skeleton (3), a square coil (4) and afixed support device (6) and further comprising a lead-out copper bar or copper wire (7) of the coil, wherein the EE magnetic core (2) is formed by installing two E-type magnetic cores (21) in such away that the openings of the two E-type magnetic cores are opposite to each other and the two E-type magnetic cores are aligned in the vertical direction; the square skeleton (3) sleeves the central pillar of the EE-type magnetic core (2); the square coil (4) is a vertical structure and is formed by winding a combination of a low-voltage coil (41) and a high-voltage coil (42) around the square skeleton (3); and the high-voltage coil ( 42) and the low-voltage coils are alternately wound around the square skeleton (3). The dry-type high-frequency high-voltage transformer structure solves the performance defects of low transmission capacity, low step-up voltage, low efficiency, incapability of long-term operation and low reliability in the current high-frequency and high-voltage fields such that a high-frequency and high-voltage power supply can be used widely and reliably.

Disclosed is a method for generating a frequency doubling Ince-Gaussian light beam. Based on a nonlinear optical calculation holographic theory, phase and amplitude information of an IG light beam areintroduced to a hologram definition equation, and a hologram carrying IG light beam optical filed distribution is made by MATLAB programming; by adopting a mask-free photoetching method, the hologramis transferred to an LN crystal thin film to prepare a hologram domain structure in the LN crystal thin film; the surface of the LN crystal thin film is plated with a layer of metal Cr by adopting anelectron beam evaporation method, and then stripping is performed to form a patterned electrode needed by polarization; preparation of the domain structure is realized by adopting a probe pressurizing method; and femtosecond laser is pumped to the domain structured LN crystal thin film to generate the frequency doubling light beam in first-order diffraction position of a far field. By virtue of the method, processes of light beam shaping and frequency conversion are realized synchronously, and advantage of integration is realized.

A data signal transmission method comprises the following steps: a sending end acquires a data signal and an analog audio signal; the sending end carries out spread spectrum processing on the data signal to obtain a spread spectrum signal; the sending end synthesizes the spread spectrum signal and the analog audio signal into a mixed signal and sends the mixed signal to a receiving end; and the receiving end receives the mixed signal and carries out inverse spread spectrum processing on the mixed signal to obtain the data signal. Bandwidth of the data signal is less than a threshold. In addition, the invention also provides a data signal transmission system, a signal transmission control method and a system. According to the above data signal transmission method and the system, during data signal transmission, the interference with the analogue audio signal is little, and noises generated during data signal transmission can be reduced. The above signal transmission control method and the system can be adopted to minimize the interference with the analogue audio signal during data signal transmission.

The embodiment of the invention provides a seismic data low-frequency compensation method and device based on sparse envelope, a processor and a storage medium. The method comprises the following steps: constructing a Ricker matching wavelet dictionary; establishing a sparse decomposition and matching wavelet set of the seismic data; reconstructing a matched wavelet signal; determining a residual error of the matched wavelet signal and a corresponding residual error envelope; determining band-pass filtering of the residual envelope; determining a combination of data-driven low frequency compensated seismic data. Aiming at the problem that an inversion result is unstable due to the fact that seismic data low-frequency information for interpretation and inversion is lost under the limitation of a detector technology, the method is directly based on data driving and is combined with a signal reconstruction method of a sparse representation theory and an envelope ultra-low frequency characteristic in a signal modulation and demodulation theory, on the basis of keeping the original real information of the signal, the low-frequency component of the signal is compensated, the spectral range is widened, the multiplicity of the subsequent inversion interpretation work can be effectively reduced, the acquisition cost is saved, and the interpretation precision is improved.

The invention discloses a coal mine personnel and vehicle safety management and control system and method based on UWB and Beidou positioning, and the system is characterized in that a UWB positioning base station is connected with an Internet of Things gateway to form a wireless network, and is used for detecting a positioning vehicle-mounted terminal and a positioning work card which enter a network setting range; the positioning vehicle-mounted terminal and the positioning work card are connected in a wireless mode and used for achieving distance measurement, a UWB positioning switch and a Beidou positioning module are arranged in the positioning work card, the positioning work card is connected with the UWB positioning base station through the UWB positioning switch or the Beidou positioning module, and the UWB positioning base station is connected with the positioning system server through the Internet of Things gateway. The alarm information can be automatically and accurately pushed, field personnel are intelligently prompted to pay attention to risk prevention, and safety accidents are reduced.

The invention discloses a fan and electronic equipment. The technical problem that the noise of a fan in the prior art is too large is solved. The fan comprises a base, a stator and an impeller. The stator is fixedly arranged on the surface of the base. The impeller is rotatably arranged on the periphery of the stator and comprises at least two fan blades including a first fan blade and a second fan blade, and the first fan blade and the second fan blade are different in structure. Due to the fact that the impeller comprises the two fan blades different in structure, the frequency spectrum of sound waves of the noise of the fan is partially offset and is distributed within the wider range, the peak value of the sound waves under the single frequency spectrum is lowered, and then the technical effect of lowering the fan noise is achieved.

The present injvention belongs to the field of optical communication technology. According to the intercoupling theory between photon crystal defect states said invention researches the relationshipobetween defect layer thickness and transmission spectrum, relationship between number of periods of structure between defect layers and transmission spectrum and influence of defect with different quantitites to the performance of device so as to design the invented plane optical delay device. Said invneted plane optical delay device is characterized by that several defect states can be introduced into polycrystal Si / noncrystal SiO2 multilayer membrane, and the intercoupling between defect states can be used to broaden the transmission spectrum of device and can meet the basic requirements ofhigh-speed optical communication.

The invention discloses a high-voltage pulse signal generator and circuit and a circuit parameter calculation method thereof. A high-voltage direct current source uses a charging resistor to charge amain capacitor via a wave head adjusting resistor. The main capacitor, the wave head adjusting resistor, a wave tail adjusting resistor, a primary storage capacitor and a controllable trigger switch form a primary microsecond pulse loop to generate wavefront-adjustable microsecond pulse wave; the primary storage capacitor, a steepening switch, a secondary storage capacitor, and a wave modulation resistor form a secondary nanosecond pulse output loop to output a high-voltage nanosecond pulse wave; according to the capacitance value of a load inlet, a proper wave adjusting resistor is selected and frequency domain distribution of the output pulse is adjusted. The circuit has advantages of large output pulse spectrum range and high voltage; and the first-end voltage pulse frequency spectrum range of the converter transformer is large and the distribution is uniform. The amplitude of the output voltage can be controlled via the input. The circuit is suitable for the high-voltage pulse generator of the transformer time domain characteristics measurement.

The invention discloses an optical frequency comb generation device, which comprises a tunable laser, a micro-nano optical fiber and a peanut-shaped resonant cavity, laser emitted by the tunable laser is coupled into the peanut-shaped resonant cavity through the micro-nano optical fiber and forms an optical frequency comb, and the peanut-shaped resonant cavity is prepared by melting and compressing a single-mode optical fiber twice. The outline of the peanut-shaped resonant cavity is in axial symmetry, the peanut-shaped resonant cavity comprises a first bottle-shaped optical microcavity and a second bottle-shaped optical microcavity which are coaxially arranged in the axial direction of the peanut-shaped resonant cavity, and the first bottle-shaped optical microcavity and the second bottle-shaped optical microcavity are partially overlapped in the axial direction. The invention also provides a light source frequency stabilization system and a method of the atomic magnetometer. The comb tooth interval of the optical frequency comb obtained by the optical frequency comb generation device is as low as 0.1-1GHz, dispersion is easy to adjust, and the light source frequency stabilization system and method of the atomic magnetometer based on the optical frequency comb generation device realize high-precision and high-frequency-stability light source output of the atomic magnetometer.

The invention discloses a self-excited converter, and belongs to the technical field of power supplies. The self-excited converter is invented to generate stable and higher oscillation frequency by adding a resistor, an inductor and a capacitor on the basis of the prior art and creating a wiring method among the resistor, the inductor, the capacitor and a switching tube, so that ripple voltage output by an output end is lower, the size of a high-frequency transformer can be reduced, and the manufacturing cost is reduced.

The invention discloses a fiber grating acceleration transducer based on a metal bellows structure. The upper end of the metal bellows is arranged on the lower surface of the top in a shell provided with a through hole; the lower end of the metal bellows is provided with a mass block; the lower end of the shell is provided with an end cover which is provided with a through hole and connected witha sealing cover; the lower end of the sealing cover is provided with a transducer joint; a vibration sensing fiber grating is arranged in the metal bellows; the upper part of the fiber of the vibration sensing fiber grating is fixed on the shell; and the lower part of the fiber of the vibration sensing fiber grating passes through a central through hole of the mass block to be fixed on the mass block, and is led out of the through hole on the side wall of the sealing cover and fixed on the side wall of the sealing cover. Compared with the existing acceleration transducer, the fiber grating acceleration transducer disclosed by the invention has the advantages of simple structure, small volume, high sensitivity, wide spectral range and long and thin shape, is easy to assemble in series and the like, and can realize multipoint distribution and dynamic online real-time monitoring.

The invention discloses a low-frequency trapezoidal wave modulated intermediate-frequency pulsed magnetic field fracture treatment device. The low-frequency trapezoidal wave modulated intermediate-frequency pulsed magnetic field fracture treatment device comprises a host and a transducer inductance coil, and is characterized in that the host comprises a microprocessor control unit, a PFC module and a trapezoidal wave modulated intermediate-frequency pulse output unit; the microprocessor control unit is used for controlling the fracture treatment device to work; the PFC module is used for improving the effective utilization rate of a power supply; a low-frequency trapezoidal wave forming module is used for forming trapezoidal waves and storing energy; a trapezoidal wave modulated intermediate-frequency pulse output unit is used for generating low-frequency trapezoidal wave modulated intermediate-frequency pulse for output; and the microprocessor control unit is connected with the PFC module, the low-frequency trapezoidal wave forming unit and the trapezoidal wave modulated intermediate-frequency pulse output unit in sequence separately. According to the low-frequency trapezoidal wave modulated intermediate-frequency pulsed magnetic field fracture treatment device, various physical factors act on a fracture fixing part at the same time, the functions of bones and muscles are enhanced while the fracture is quickly and effectively treated, the fracture is helped to be completely cured, and the function is recovered as before.

The invention discloses a converter valve test system based on high voltage square wave pulse excitation. The system includes a high voltage square wave pulse generating unit, a first voltage dividingunit, a second voltage dividing unit, a standard impedance and data collecting unit and a sample. The present further discloses a converter valve test method based on high voltage square wave pulse excitation. The system is advantaged in that measurement accuracy can be improved through utilizing high-voltage square-wave pulses instead of sinusoidal pulses in a conventional test system, moreover,characteristics of the high-voltage square wave pulses can be utilized to obtain the impedance spectrum information in the higher frequency domain range in the test, and test efficiency is improved.

The invention provides a monochrome LED for plant illumination and a plant illumination lamp. The monochrome LED for plant illumination includes a substrate, a blue light chip and a fluorescent adhesive layer. The fluorescent adhesive layer includes package adhesive and fluorescent powder mixed in the package adhesive. The fluorescent powder includes fluoride red powder and nitride red powder. Thechemical formula of the fluoride red powder is K<2>Si<x>Mn<1-x>F<6>, wherein 0.05<=x<=0.1. The chemical formula of the nitride red powder is SrEuCa<1-a-b>AlSiN<3>, wherein 0.05<=a<=0.1, and 0.008<=b<=0.08. By mixing the fluoride red powder and the nitride red powder into the fluorescent powder and using the blue light chip to excite the fluorescent powder, monochrome illumination light witha wide spectrum range can be obtained, and monochrome light can be supplemented to plants to promote the growth of plants.

The invention discloses a method and a device for searching a downlink synchronous code. The method comprises: each first SYNC_DL code is subjected to frequency translation to correspondingly obtain each second SYNC_DL code; each second SYNC_DL code is adopted to search and calculate the SYNC_DL code in a baseband signal; and each relevant peak value obtained through calculation is compared so as to obtain the SYNC_DL code corresponding to the largest relevant peak value as a search result. With the method, as the SYNC_DL code is subjected to frequency translation, the SYNC_DL code can be searched near a plurality of frequency points. Even if the frequency deviation of the baseband signal is large, and the frequency deviation value always drops near a certain frequency point in the plurality of the frequency points, thereby the baseband signal is searched. The invention also discloses a device for searching the SYNC_DL code.