895 results about "Microwave signals" patented technology

The invention provides a broadband tunable low-phase-noise photo-generated microwave signal source and device, and relates to the technical field of photo-generated microwaves. According to the invention, a low-frequency optical pulse and a high-frequency microwave signal are respectively input into the electro-optical sampling phase-locked loop; and the electro-optical sampling phase-locked loop determines the synchronization error of the optical pulse and the microwave signal based on the phase difference between the optical pulse center point and the microwave signal zero crossing point. And taking the synchronization error as a feedback signal, and continuously adjusting the frequency and the phase of the microwave signal by the voltage-controlled oscillation module until the frequency and the phase are synchronized with the Nth harmonic of the optical pulse. By setting different initial frequencies of the voltage-controlled oscillation module, microwave signals with different integral multiple optical pulse frequencies can be obtained, and broadband tuning of photo-generated microwave signals is realized. Furthermore, the repetition frequency of the frequency comb is locked through beat frequency of two beams of reference laser and two adjacent comb teeth, the stability of the reference laser is transmitted to the optical pulse, and the stability of the reference laser is further transmitted to the microwave signal through synchronization of the optical pulse and the microwave signal, so that the phase noise of the photo-generated microwave signal source is reduced.

The invention relates to the technical field of quantum sensing and ocean detection, and discloses an ocean magnetic field sensor based on an NV color center and an ocean magnetic field measuring method.The sensor comprises a cylindrical pressure-resistant cabin, an optical platform arranged in the pressure-resistant cabin and a main control panel; a laser, a beam shaping unit, a dichroscope, a beam shaping lens group, an objective lens, a diamond NV color center chip, a plano-convex lens I, a band-pass filter and a photoelectric detector are mounted on the optical platform; two microstrip loop antennas are mounted on the outer side of the diamond NV color center chip; an FPGA + ARM dual-core processor, a digital lock-in amplifier and two microwave signal generators are installed on the main control board, and the microwave signal generators are connected with the microstrip loop antenna and achieve electromagnetic coupling with the diamond NV color center chip. The invention has the advantages of high sensitivity, good long-term stability and strong anti-interference capability, and provides a new generation of quantum sensing solution for applications such as ocean geomagnetic monitoring and underwater target identification.

The invention relates to the technical field of microwave remote sensing monitoring, in particular relates to microwave remote sensing monitoring applied to the internal temperature of a coal storage yard, and particularly discloses a coal pile multi-frequency-band microwave remote sensing monitoring method and a coal pile multi-frequency-band microwave remote sensing monitoring system. The system comprises a multi-band microwave transmitting and receiving module, a signal data processing module, a data fusion and inversion model, a data storage module, a visual early warning control system and the like. Microwave signals of the surface layer and / or the shallow layer of the coal pile are detected through high-frequency-band microwaves; temperature distribution data in the coal pile are analyzed through inversion calculation of a pre-established data fusion and inversion model, laser spectrum data of the coal pile are obtained through detection of laser equipment, and harmful gas concentration data and corresponding position data are obtained. The method and the system can be used for early warning and monitoring the internal temperature and the spontaneous combustion point of the coal pile of the coal storage yard, and can effectively and accurately monitor.

The invention provides a microwave superheterodyne frequency sweep measurement system based on Rydberg atoms, and belongs to the technical field of microwave frequency measurement. The laser module excites detection light of 780 nm and coupling light of 480 nm, and the two beams of light are reversely input into the atomic gas chamber through the dichroscope; signal microwaves are generated by a radio frequency signal source and are radiated to the position of the atomic gas chamber through the horn antenna; local oscillation microwaves are generated by the microwave module and are also radiated to the position of the atomic gas chamber through the horn antenna; the atomic gas chamber serves as a mixer to form a difference frequency signal; the spectrum analyzer is used for monitoring low-frequency difference frequency signals generated in the frequency mixing process in real time and recording signal intensity in real time. According to the invention, high-precision and wide-band microwave frequency measurement is realized, continuous and smooth frequency sweeping response can be provided in a frequency range, and absolute frequency detection of microwave signals is realized under the condition that a complex frequency comb technology is not introduced. The hardware architecture is simplified, the automation degree is improved, and integration, popularization and application are facilitated.

The invention discloses a full-locking integrated microcavity optical comb based on coherent population trapping spectral lines, and belongs to the technical field of integrated microcavity optical combs. The full-locking integrated micro-cavity optical comb comprises a laser generation module, a frequency reference subsystem and a micro-cavity optical comb system. The laser generation module is used for generating two paths of laser, the frequency reference subsystem modulates one path of laser, a modulated optical signal is emitted into the atomic gas chamber system, and after transmission light is demodulated and subjected to phase-locked amplification processing, an optical frequency signal and a microwave signal which are locked to an atomic spectral line are obtained; and the optical frequency signal is fed back to the laser generating module to realize optical frequency locking. And the microcavity optical comb system adopts a microwave signal generated by the frequency reference subsystem as a frequency reference, and modulates the other path of laser to serve as pump light to enter the optical microcavity, so that optical comb output of a soliton state in the optical microcavity is realized. According to the invention, a single quantum system is taken as a reference, the problem of full locking of the micro-cavity optical frequency comb is effectively solved, and the system integration degree is relatively high.

The invention discloses an implementation method of a quantum logic gate and a quantum computer system. The method comprises the following steps: preparing a quantum bit to a preset initial quantum state; according to the Hamiltonian corresponding to the quantum logic gate, respectively generating microwave signals corresponding to each segment in the Hamiltonian; the Hamiltonian of the quantum logic gate comprises at least two segments, and the at least two segments are used for enabling quantum bits to generate at least one polarity reversal in evolution; the generated microwave signals corresponding to all the segments are spliced; and applying a spliced microwave signal to the quantum bits in the initial quantum state, so that the quantum bits evolve from the initial quantum state to a target quantum state. According to the invention, the quantum bit can generate at least one polarity change in evolution, partial phase dispersion is offset by using the polarity characteristic of 1 / f noise, decoherence is inhibited, and the fidelity of the single-bit quantum logic gate is further improved.

The invention provides an online monitoring method for a curing process of a resin-based composite material, and belongs to the technical field of curing monitoring of composite materials. In the curing process of the resin-based composite material, a conductive patch is placed on the surface of the resin-based composite material to form a laminated structure consisting of the conductive patch, a dielectric layer containing resin and a high-reflection substrate, and the curing process of the resin-based composite material is deduced in real time by using a microwave signal to radiate the laminated structure and monitoring peak valley characteristics and temperature changes of a reflection signal. According to the method, a microwave signal is utilized to irradiate a laminated structure, and the curing process of the resin-based composite material is judged by monitoring the peak valley characteristics and temperature change of a reflected signal in real time. The in-situ online curing process monitoring method based on the microwave signal and the conductive patch film sensor not only can realize real-time online monitoring of the resin curing key point and the curing degree, but also has the remarkable advantages of being capable of adjusting the monitoring position in real time, realizing curing degree field monitoring and the like.

The invention discloses a high-isolation waveguide three-way power dividing and combining network structure which comprises a waveguide three-way power divider and a waveguide three-way power combiner, and an amplifier is connected between the waveguide three-way power divider and the waveguide three-way power combiner. The waveguide three-way power divider comprises a power divider upper waveguide cavity and a power divider lower waveguide cavity which are symmetrically arranged, and the power divider upper waveguide cavity and the power divider lower waveguide cavity are connected through screws. The waveguide three-path power combiner comprises a combiner upper waveguide cavity and a combiner lower waveguide cavity which are symmetrically arranged, and the combiner upper waveguide cavity and the combiner lower waveguide cavity are connected through screws. Microwave signals are distributed by the waveguide three-way power distributor, amplified by the amplifier, and then combined by the three-way power combiner. By constructing a brand-new three-path power division and synthesis network architecture, the problem of mutual load traction of amplifiers in a traditional non-isolated network is solved, and the stability of power synthesis is improved.

The invention provides a high-sensitivity superconducting magnetic detection device and method based on an NV color center under high pressure and low temperature. The high-sensitivity superconducting magnetic detection device comprises a microwave emission module, an optical excitation module, an imaging module, a fluorescence collection module, a data collection and control module, a diamond anvil cell, a low-temperature test module and a magnet module. The method has the beneficial effects that the diamond injected with the NV color center serves as the anvil cell of the diamond anvil cell, and high-pressure and low-temperature conditions are synchronously obtained in liquid helium and liquid nitrogen temperature zones; according to the invention, in-situ pressure measurement can be realized under high pressure, and ruby or Raman standard pressure is not needed; a sample is placed in the diamond anvil cell, the diamond anvil cell is placed in the low-temperature cavity, the lowest temperature of 4K and in-situ pressurization can be realized by using the low-temperature test module, and the quality of a microwave signal transmitted by the low-temperature semi-steel cable is higher and the loss is smaller by using the low-temperature semi-steel cable. And the superconducting property of the material at low temperature and high pressure is quantitatively tested under the condition of high integration.

The invention belongs to a testing and processing method, and provides a single-probe non-contact dielectric material testing and processing integrated system and a single-probe non-contact dielectric material testing and processing integrated method in order to solve the technical problems of poor real-time performance and controllability and low production efficiency of the existing dielectric material testing and processing technology. Comprising a controllable objective table, a resonant cavity single probe assembly, a programmable multi-way switch and a control unit, a single epitaxial microwave resonant cavity probe is adopted as a core component, and rapid switching and regulation of the resonant cavity single probe assembly, a vector network analyzer and a program control microwave signal generation and regulation device are realized through the programmable multi-way switch. By means of the testing and processing integrated system, non-contact type dielectric constant dynamic measurement and microwave processing can be alternately completed.

The invention relates to a method for processing medical images of human tissue of an area of a patient's body and in particular of the breast by means of a medical imaging device (1) comprising a microwave probe array consisting of K>1 probes spaced apart from one another, the array comprising P>1 different configurations defining transmitting probes and receiving probes for one or more position(s) around the area, in which the transmitting probes are configured to transmit microwave signals so as to illuminate an area of the body and the receiving probes are configured to receive microwave signals after scattering and reflection in the area, the probes being capable, in a complementary manner, of being configured to transmit and receive simultaneously.

A quantum sensing module, a quantum current transformer, and a current measurement method, the quantum sensing module comprising a quantum probe (1), a laser module (2), a microwave module (3), a photoelectric detection module (4), a lock-in amplifier (5), a frequency locking module (6), and a data processing module (7); the quantum probe (1) comprises a diamond sensing unit (11) and a microwave radiator (12); the laser module (2) is configured to output an excitation laser; the microwave module (3) is configured to output a microwave signal; the photoelectric detection module (4) is configured to receive photoluminescence generated by the diamond sensing unit (11) and convert same into an output voltage signal; the lock-in amplifier (5) comprises a modulating unit and a demodulating unit; the frequency locking module (6) comprises a PID control unit and a frequency acquiring unit. The quantum current transformer comprises a quantum sensing module, which is configured to measure a current in a conductor. The current measurement method is applied to the quantum current transformer to obtain current information within the conductor. This improves magnetic detection efficiency and increases current measurement precision.

The invention discloses a wellhead water content measuring method based on a double-frequency microwave directional antenna sensor, and the double-frequency microwave directional antenna sensor comprises two first microwave directional antennas, two second microwave directional antennas, an annular disc and a pipe body, the annular disc is annular, the annular disc is sleeved outside the pipe body and is fixedly installed with the pipe body, and the pipe body is fixedly installed on the annular disc. The two first microwave directional antennas are located above the annular disc, and the two second microwave directional antennas are located below the annular disc; the two sides of the pipe body in the radial direction are each provided with one first microwave directional antenna, and the two sides of the pipe body in the radial direction are each provided with one second microwave directional antenna. Dielectric constants and dielectric losses of oil and water are remarkably different, so that phase deviation occurs when a high-frequency microwave signal is propagated in an oil-water mixed medium, and the water content in oil-water two-phase flow is obtained by analyzing phase voltage signals with different frequencies through a double-frequency microwave directional antenna sensor.

The microwave detection robot comprises a first mounting seat, an electric telescopic rod is hinged to the first mounting seat, a second mounting seat is hinged to the output end of the electric telescopic rod, and machine body assemblies are mounted on the second mounting seat and the first mounting seat; the double-body assembly is designed, the robot is attached to a to-be-detected surface through airflow generated by a first impeller, negative pressure suction force is generated in a ring groove through a second impeller, and the negative pressure suction force is transmitted to the moving wheel assembly through a pipeline structure, so that the road holding force of the moving wheel assembly is enhanced, and the load capacity of the robot is improved; the angle between the two machine body assemblies is adjusted through the electric telescopic rods, so that the robot has the obstacle crossing ability, and the adaptability of the robot during operation in the complex environment is improved; the environment compensation module adopts an intelligent algorithm to compensate original microwave signals, so that the problem of low detection result precision caused by environmental factor interference is solved.

The invention discloses a Rydberg atom-based microwave regulation multi-channel frequency hopping device, which comprises an atomic gas chamber, probe light enters and passes through the atomic gas chamber from one end of the atomic gas chamber and then is reflected to a photoelectric detector through a polarization splitting prism, and coupled light is reflected by a reflector and then is transmitted to the photoelectric detector. The coupling light passes through the polarization splitting prism and enters the atomic gas chamber from the other end of the atomic gas chamber, and the coupling light reflected by the reflector and the probe light are overlapped in optical path and opposite in propagation direction; a local oscillator microwave signal generator and an auxiliary microwave signal generator are arranged on one side of the atomic gas chamber, the local oscillator microwave signal generator and the auxiliary microwave signal generator emit microwave signals into the atomic gas chamber, and the other side of the atomic gas chamber receives radio frequency signals to be measured; the invention further discloses a microwave regulation and control multi-channel frequency hopping method based on the Rydberg atoms. By reasonably configuring the frequency of the auxiliary microwave signal and the frequency of the local oscillation microwave signal, flexible frequency hopping of cesium Rydberg atoms in six different channels is achieved.

The invention discloses a vibration displacement sensor system for bridge operation monitoring and a use method thereof, and belongs to the technical field of bridge engineering. The system comprises data acquisition ends and data receiving and processing ends, the data acquisition ends are fixed to bridge piers, bridge abutments or the side faces of beam slabs, each data acquisition end comprises a capacitive acceleration sensor, a microwave signal antenna, a double-lithium battery pack and a solar cell panel, and the data receiving and processing ends are installed at stable positions of the two banks of a bridge. Comprising a multi-channel microwave receiving module, an edge computing unit, a 4G / 5G / LoRa / NB-IoT multi-network transmission module and a phase difference computing module. According to the invention, the problems of insufficient stability and poor environmental adaptability of existing data transmission are solved. According to the invention, through integration of temperature compensation, anti-interference communication, intelligent power supply optimization and rapid installation design, high-precision, all-weather and low-power-consumption monitoring is realized.

The invention belongs to the technical field of multi-frequency-band rapid switching devices, and particularly relates to a microwave signal generator multi-frequency-band rapid switching device which comprises a shell and a first through groove, the first through groove is formed in the top face of the shell and communicates with an inner cavity of the shell, and an exhaust fan and a first dustproof net are fixedly connected into the first through groove; the first dustproof net is located above the first through groove, and two second through grooves communicating with the outside are formed in the inner wall of the shell. The fixing support is fixedly connected to the shell, two third through grooves are formed in the two sides of the fixing support correspondingly, the two third through grooves communicate with the two second through grooves correspondingly, two fixing frames are fixedly connected to the inner walls of the two third through grooves correspondingly, and the sides, close to each other, of the two fixing frames communicate with the two second through grooves correspondingly; two bidirectional ventilation exhaust fans are rotationally connected to the two ends respectively; according to the invention, the problem that the service life of the multi-frequency-band rapid switching device is possibly reduced because heat in the multi-frequency-band rapid switching device cannot be rapidly dissipated is solved.

The application provides a current measurement device based on diamond NV color centers, which comprises a microwave source circuit unit configured to output a microwave signal; a diamond NV color center optical fiber probe group unit comprising a plurality of optical fibers, the top end of each optical fiber being provided with a diamond NV color center, and the top end of the plurality of optical fibers having different distances from a wire to be measured; the diamond NV color center optical fiber probe group unit is configured to receive the microwave signal and feed back the microwave signal to the microwave source circuit unit, so that the microwave source circuit unit outputs a microwave signal with a desired frequency according to the feedback to match the energy level resonance frequency of the diamond NV color center under different magnetic field strengths; and a current measurement unit configured to measure the current according to the energy level resonance frequency of the diamond NV color center. According to the embodiment of the application, the magnetic field generated by a larger current wire can be detected by using a lower frequency microwave signal through simultaneous detection of a plurality of diamond NV color centers spaced apart from the wire to be measured by a specific distance.

The invention discloses a rectangular waveguide sealing window structure for realizing broadband transmission, which belongs to a microwave signal detection device and comprises a first rectangular waveguide cavity, a second rectangular waveguide cavity and a rectangular dielectric block arranged between the first rectangular waveguide cavity and the second rectangular waveguide cavity, the first rectangular waveguide cavity comprises a first rectangular waveguide shell and two first stepped transition structures embedded into an inner cavity of the first rectangular waveguide cavity, and the second rectangular waveguide cavity comprises a second rectangular waveguide shell and two second stepped transition structures embedded into the second rectangular waveguide shell. The opposite side faces of the two first stepped transition structures and the two second stepped transition structures are provided with identical tooth-shaped steps, the second rectangular waveguide shell is further internally provided with an installation cavity communicated with the second I-shaped sliding groove, the two waveguide cavities are connected through screws, and the rectangular dielectric block is fixedly installed in the installation cavity. The vertically symmetrical multi-stage stepped impedance matching network provided by the invention realizes excellent transmission performance with low voltage standing-wave ratio in a wide frequency band, and is suitable for a millimeter wave system with high power and wide frequency band.

The invention discloses a microwave power test method and platform and a multi-channel microwave power consistency control method. The microwave power test method comprises the following steps: firstly, adjusting the test environment temperature or the preheating time of a microwave signal source until the test environment temperature is within a preset temperature range and the preheating time of the microwave signal source meets a preset time range, then setting test parameters of the microwave signal source, and then starting from the initial power; adjusting the current output power of the microwave signal source according to the power step length, and controlling the microwave signal source to output a microwave signal to the to-be-detected detection module according to the current output power; the method comprises the steps that a microwave signal source is connected with a detection module to be tested, output voltage of the detection module to be tested is obtained, the output voltage is processed and stored, when current output power of the microwave signal source reaches end power, a test end signal is displayed, test is stopped, and input power test data and corresponding output voltage test data of the detection module to be tested are obtained. According to the invention, the efficiency and reliability of microwave power testing can be effectively improved.

The invention relates to a sweep frequency optical frequency comb generation system and a generation method. Fourier mode locking is realized through a Fourier mode locking photoelectric oscillator system. The sweep frequency optical frequency comb generation system is a closed Fourier mode-locked laser loop which is composed of a first optical amplifier, an optical fiber isolator, a broadband filter, a polarization controller, a thin film lithium niobate optical chip, a signal generator, a dispersion compensation optical fiber and a first optical coupler; and a photoelectric oscillator loop is formed by a second optical coupler, a single-mode delay optical fiber, a second optical amplifier, a photoelectric detector, a narrow-band filter, a low-noise amplifier and an electric power divider. Time domain active mode locking and Fourier mode locking are carried out on the laser resonant cavity at the same time, synchronous modulation of multiple optical frequency comb modes is achieved, sweep frequency optical frequency comb signals with high repetition frequency, high modulation speed, high coherence length and high output power are generated, and tunable optical frequency comb and high-quality high-frequency microwave signal output can be provided at the same time.

The invention relates to the technical field of microwave photonics, and discloses a full-band noise microwave source system and a microwave signal generation method. An optical reference unit is used for generating an optical reference signal; the photoelectric phase detection unit is connected with the optical reference unit and is used for receiving the optical reference signal and a feedback signal sent by the microwave oscillation unit and outputting a beat frequency electric signal for reflecting a phase error; the servo control unit is connected with the photoelectric phase detection unit and the microwave oscillation unit and is used for separating the beat frequency electric signal into a low-frequency control signal and a high-frequency control signal; the microwave oscillation unit is connected with the servo control unit and outputs a target microwave signal in response to the low-frequency control signal and the high-frequency control signal. A beat frequency electric signal is separated into a low-frequency path and a high-frequency path by using the servo control unit, so that targeted suppression of phase noise of different frequency bands in a single signal source is realized.

The invention relates to a Rydberg atomic communication receiving system and method based on AT split peak value analysis, and belongs to the technical field of quantum communication. The system comprises a detection laser, a coupling laser, an AOM / EOM, a function generator, a high-frequency signal generator, a cesium atom gas chamber, a photoelectric detector, a lock-in amplifier, a data acquisition module and a microwave signal output module. The AOM / EOM modulates the frequency of the detection laser; the microwave signal output module generates an AM modulation microwave signal and transmits the AM modulation microwave signal to the cesium atom gas chamber, so that the target Rydberg state atoms generate an AT splitting effect to calibrate system parameters; the photoelectric detector and the lock-in amplifier obtain a first harmonic component based on the transmission light. During communication, the system is arranged in a microwave electric field received by communication, and the data acquisition and processing module outputs AM modulation microwave signals received by the recovered cesium atom gas chamber based on calibrated system parameters and phase locking. The method solves the problem of signal distortion existing in EIT-AT direct communication transmission and the problem of tedious operation of a heterodyne method.

The invention discloses a microwave photon beam forming network architecture based on a switch switching type optical adjustable true delay line and a phased array radar system thereof. According to the framework, microwave signals are modulated in an optical domain, and the characteristics of a plurality of adjustable delay paths in a single-channel switch switching type delay line are utilized, so that delay difference adjustment of multiple paths of optical signals is realized, the number of delay lines and delay units is greatly reduced, and meanwhile, high-precision and broadband beam-strabismus-free beam forming is supported; through two-stage or multi-stage delay configuration, the network can flexibly meet the broadband delay compensation requirements of different array antenna units, has low complexity and strong dynamic reconfigurable capability, is suitable for realization of a large-scale photonic integrated chip, reduces the number of delay lines by about 50%, does not generate frequency dispersion, and is suitable for large-scale photonic integrated chips. The system complexity, the cost and the power consumption can be remarkably reduced, and the method is particularly suitable for broadband phased array systems of millimeter waves, satellite communication, radar detection and the like.

The invention discloses an intelligent monitoring method and device based on multi-modal information fusion, and the method comprises the steps: (1) collecting multi-modal data; (2) carrying out self-adaptive preprocessing on the microwave signal; (3) video image self-adaptive preprocessing; (4) multi-domain feature extraction; and (5) carrying out weighted fusion classification output. The method and the system are suitable for monitoring main grain storage pests such as maize weevil and grain beetles in the scenes of national grain depots and civil granaries, can realize real-time identification, positioning and counting of pests from the surface layer of a grain pile to the depth of 0.5 m, and solve the problems of insufficient performance of a single-mode sensor (vision, radar and acoustics) and poor adaptability of a multi-mode fusion environment in the prior art. The method adapts to intelligent transformation of the existing granary, and meets the requirements of high precision, full coverage and strong robustness of modern grain storage.

The invention relates to a magnetic field sensor (10), comprising: an excitation light source (6) for emitting excitation light (4), a measurement region (7) which has colour centres (3) in a crystal (1), preferably NV centres in a diamond, which emit fluorescent light (5) when excited with the excitation light (4), a detector (8) for detecting the fluorescent light (5) from the measurement region (7), a microwave emitter (11) for applying a microwave field (9) to the measurement region (7), a signal generator (14) which is designed to generate a microwave signal (15) for the microwave emitter (11) and has two frequency components (fsb-(t), fsb+,π(t)) phase-shifted in relation to one another by π, in order to simultaneously excite magnetic field resonances at two different resonant frequencies (f-, f+) in the crystal (1) in order to determine a magnetic field (B), and an evaluation device (12) which has a demodulator (13) for forming a demodulated magnetic resonance signal from the detected fluorescent light (5) of the measurement region (7), wherein the evaluation device (12) is designed to determine a detuning (∆B) of the resonant frequencies (f-, f+) due to a change in the magnetic field (B), and to generate a frequency shift (∆f) of the microwave signal (15) according to the magnetic-field-related detuning (∆B) of the resonant frequencies (f-, f+). The magnetic field sensor (10) is designed to determine, in a temperature calibration step, a temperature-related detuning (∆T) of the resonant frequencies (f-, f+) and to take same into account in the frequency shift (∆f) of the microwave signal (15) in order to determine the magnetic field (B). The invention further relates to an associated method for calibrating the temperature of a magnetic field sensor (10).

The quantum current transformer based on the optical fiber isolation microwave transmission comprises a high-voltage primary side which comprises a magnetic shielding ring and an NV color center magnetic sensing probe module, and a magnetic sensing probe is arranged in the magnetic shielding ring; at the low-voltage secondary side, the microwave system is used for generating radio-frequency signals in a preset frequency range and transmitting the radio-frequency signals to the NV color center magnetic-sensing probe module, the laser system is used for generating continuous laser and transmitting the continuous laser to the NV color center magnetic-sensing probe module, and the microwave system and the laser system are used in cooperation to drive the NV color center to generate fluorescence signals representing the magnetic field intensity. A fluorescence signal is transmitted to the data processing system to calculate to-be-detected current information; wherein the microwave system is connected with the NV color center magnetic sensing probe module through an optical fiber, the microwave system modulates the radio frequency signal into an optical signal, transmits the optical signal to the NV color center magnetic sensing probe module, and restores the optical signal into the radio frequency signal in the NV color center magnetic sensing probe module to be received. According to the transformer, stable transmission of microwave signals under the high-low voltage isolation condition is achieved, the design is reasonable and exquisite, and the measurement precision is high.

The invention discloses a photon-assisted microwave signal time-frequency amplitude-phase measurement system and method, and the system is characterized in that a pulse light source outputs a light pulse which enters an input end dispersive medium to complete pulse broadening, and then the light pulse enters an electro-optical modulation module; meanwhile, the power divider receives the microwave signal and divides the microwave signal into two paths to be input into an upper sub-modulator and a lower sub-modulator of the electro-optical modulation module so as to modulate optical pulses; a modulated optical signal output by the electro-optical modulation module passes through an output end dispersive medium to complete a time convolution process, then the output optical signal is divided into two paths through the optical coupling module, the two paths sequentially pass through the polarization controller, the polarization beam splitter, the photoelectric detector, the analog-to-digital converter and the digital signal processor, position information and amplitude information of an electric pulse are collected, and the position information and the amplitude information of the electric pulse are obtained. And obtaining time, amplitude, frequency and phase information of the microwave signal. The time, frequency, amplitude and phase information of the microwave signals can be measured at the same time, complex back-end processing is not needed, and the processing speed is high.

The invention discloses a modularized microwave signal source, which belongs to the technical field of microwave communication and comprises a radio frequency front-end module, a lower variable intermediate frequency and mixing filter module, an upper variable intermediate frequency and mixing filter module, an amplitude control module and a power supply control board for supplying power to and controlling the modules in a distributed manner, each module is arranged in an independent cavity with an electromagnetic shielding structure; the modular microwave signal source adopts a secondary mixing superheterodyne scheme as a basic microwave link, and adopts a primary mixing scheme as a millimeter wave extension link. The modularized microwave signal source is divided into a plurality of standardized modules which can be independently detached and have subdivided functions, so that the problems of difficulty in maintenance, fixed design and high cost of a traditional high-integration-level microwave component are solved, and the high performance, high maintainability, strong reusability and wide-frequency-band coverage effect of the microwave signal source are realized.

The invention relates to the technical field of structural health monitoring and safety evaluation, and discloses an acoustic emission-microwave fused concrete crack resistance monitoring method, which comprises the following steps: S1, data acquisition: acquiring an acoustic emission signal and a microwave signal of a concrete structure; s2, a signal preprocessing step: performing noise reduction, feature extraction and environment compensation on the acoustic emission signal and the microwave signal; and S3, data fusion: fusing the acoustic emission signal and the microwave signal by adopting a Bayesian optimization method. The invention further provides an acoustic emission-microwave fusion concrete anti-cracking performance monitoring device and an acoustic emission-microwave fusion concrete anti-cracking performance monitoring system. Through dynamic monitoring adjustment, an environment correction prediction model and a structural stability evaluation method, accurate tracking of crack propagation, intelligent prediction of long-term trend and quantitative evaluation of bearing capacity are realized, and the real-time performance, accuracy and comprehensiveness of structural health monitoring are improved.