166 results about "Microwave detection" patented technology

The invention relates to the technical field of radiator monitoring, and particularly discloses a radiator heat dissipation performance dynamic test system, which is characterized in that a heat source simulation body is arranged on a heat transfer interface of a radiator, and a high-fidelity dynamic electric power load is applied to the heat source simulation body to simulate an actual working condition; radiating a microwave detection signal to a space where the heat source simulator is located and receiving a multi-path scattering response signal; the three-dimensional dielectric constant dynamic distribution of the heat source simulation body is reconstructed by solving the inverse scattering problem fused with the space-time constraint; according to the material dielectric constant-temperature relation mapping, three-dimensional temperature field dynamic distribution is generated; and finally, intelligently identifying and extracting a migration track and a temperature change curve of the highest temperature point in the space from the continuous time sequence temperature field data, and taking the migration track and the temperature change curve as a direct evaluation basis for the dynamic heat dissipation performance of the radiator. According to the method, lossless, full-field, real-time visualization and quantitative analysis of the migration process of the dynamic hot spots in the hidden heat source are realized, and the authenticity of the dynamic heat test is improved.

The invention discloses a cable trench fireproof cover plate performance detection device and method based on multi-band electromagnetic waves. The device comprises a microwave detection module, a terahertz imaging module, a high-precision two-dimensional mechanical scanning platform, a synchronous control and data fusion unit and a comprehensive data analysis platform. The microwave module is used for transmitting and receiving 1-10GHz electromagnetic waves to realize deep structure detection; the terahertz module works at a frequency band of 0.1-3 THz and is used for acquiring near-surface time-domain spectral information. And the scanning platform drives the modules to perform two-dimensional rasterization scanning on the surface of the cover plate. And the synchronous control and data fusion unit coordinates the time sequence action of each module to ensure the time-space consistency of data acquisition. And the comprehensive data analysis platform performs fusion processing on the multi-source data through an inversion and imaging algorithm to generate a comprehensive evaluation report covering internal macroscopic defects, near-surface microdefects and coating thickness. According to the invention, through collaborative integration of microwave and terahertz technologies, multi-scale and integrated nondestructive testing and performance evaluation of the fireproof cover plate from a deep layer to a surface layer are realized.

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 relates to the technical field of defect detection, in particular to a defect detection method and system based on a microwave frequency crystal resonator, and the method comprises the steps: forming a microwave probe through a microwave frequency crystal resonator array, placing a to-be-detected material below the microwave probe, and setting a scanning area and scanning step lengths in two directions on the surface of the material; controlling the probe to perform point-by-point scanning according to step length, and collecting a plurality of reflection coefficients of each sampling point to form an echo signal matrix; performing singular value decomposition on the matrix, applying an adjustable coefficient to a first singular value and a second singular value, and adaptively selecting an optimal coefficient according to imaging quality to reconstruct an echo signal; performing two-dimensional Fourier transform on the reconstructed matrix, constructing a spatial filter in combination with probe spacing and defect depth to perform phase compensation, performing two-dimensional Fourier transform to obtain a defect image, and performing threshold segmentation on the defect image to obtain a binary image only containing defects; and analyzing the connected regions to obtain the gravity center position of each defect and the defect area determined by the pixel number and the single pixel area. The problems of serious clutter interference, insufficient defect imaging contrast ratio, difficulty in quantitative evaluation of defect size and the like in the existing microwave detection can be solved.

The invention relates to the technical field of polyethylene pipeline welded joint defect detection, in particular to a polyethylene pipeline welded joint microwave detection device and method based on a separable annular guide rail. The detection device comprises a profile support, an axial movement control device, a separable annular guide rail assembly and a circumferential detection device. The detection method comprises the steps that the clamping jaw type control mechanism drives the motor to be connected with the semi-annular guide rail; the ultrasonic distance sensor array measures the relative position of the annular guide rail and the polyethylene pipeline in real time, and a distance model of the annular guide rail and the polyethylene pipeline is established; calculating the adjusting distance of the microwave probe, and pushing the microwave probe by an electric push rod according to the adjusting distance; performing axial line scanning analysis to obtain an axial coordinate of the welding joint; different scanning modes such as spot scanning are executed according to different detection signals; the electric push rod adaptively adjusts the distance of the microwave probe according to the distance model. The device has the characteristics of stability, reliability, high adaptability to pipelines with different pipe diameters, high detection efficiency and the like.

The invention discloses a complementary split ring type antenna sensor for noninvasive blood glucose multi-frequency detection. The complementary split ring type antenna sensor comprises a metal radiation layer, a dielectric layer and a microstrip transmission line, the invention provides a detection method based on a microwave detection (MDT) principle, and the detection method comprises the following steps of: firstly, carrying out a microwave detection (MDT) on the basis of the microwave detection (MDT) principle; the device has the advantages of noninvasive property, high penetrating power, real-time continuous monitoring and the like. According to the present invention, by using a complementary split ring (CSRR) structure, the size design of the antenna sensor is significantly reduced, and a plurality of different resonance modes are successfully excited. A multi-frequency detection mode is adopted, and the robustness and sensitivity of blood glucose concentration detection are improved. The antenna sensor is compact in structure, simple in manufacturing process and low in cost, and has high application value in the field of medical detection. The antenna sensor provided by the invention can monitor the blood glucose concentration in real time, and has the capability of resisting environmental interference (pressure deformation).

The invention discloses a liquid food pollutant microwave sensing detection method and system based on machine learning, and the method specifically comprises the steps: building a theoretical model for microwave detection of liquid food pollutants, and designing an antenna unit structure; defining a detection area on the conveyor belt and setting a sampling point position, calculating a phase difference from each antenna unit to the sampling point position, and designing a compensation phase of each antenna unit; an array antenna is built in the simulation software, and the focusing effect of the array antenna is verified; the FPGA control panel is designed for the array antenna, the upper computer is used for controlling the working state of each antenna unit, and the upper computer, the FPGA control panel and the antenna board are integrated to form the detection device. Testing the food before and after being polluted, and constructing a test data set of scattering parameters of the food before and after being polluted; and establishing a machine learning model to detect whether pollutants exist in the liquid food or not and the pollution type. According to the invention, the success rate of food pollutant detection is improved, the detection range is wider, and the detection capability is stronger.

The invention provides a microwave detection method and device for PE pipe hot-melting weld defects, and the method comprises the following steps: 1) taking a hot-melting weld of a PE pipe and a base material near the weld as detection objects, and carrying out axial and circumferential microwave scanning to obtain a reflection coefficient of each position point; 2) carrying out two-dimensional space Fourier transform on the reflection coefficient of each position point; 3) carrying out phase correction on the converted data in the depth direction; 4) carrying out two-dimensional space inverse Fourier transform on the corrected data to obtain a reflection coefficient of the target; 5, image reconstruction is carried out on the reflection coefficient of the target, and information of the defects in the PE pipe hot-melt welding seam is obtained.According to the scheme, the method has the advantages that the defects can be detected, the defect positions can be determined, and conclusion obtaining does not excessively depend on personnel skills.

The application discloses an online grain moisture detection device and method, which comprises a rack, a volume standard mechanism installed on the rack, a horizontal conveying belt, a baffle, a stepping motor and a plurality of partitions, the stepping motor is connected with the horizontal conveying belt and drives the horizontal conveying belt to move, the baffle is located on both sides of the horizontal conveying belt, the plurality of partitions are arranged on the horizontal conveying belt and respectively enclosed with the baffle to form closed cavities, a microwave detector is installed above the volume standard mechanism, a quantitative feeding mechanism is connected with the volume standard mechanism through a material distributing mechanism, the material distributing mechanism is arranged in an inclined mode, and a controller is connected with the quantitative feeding mechanism, the material distributing mechanism, the stepping motor and the microwave detector respectively. The application further discloses an online grain moisture detection method.

A concrete structure reinforcement corrosion detection method based on a random forest algorithm and microwave scattering parameters comprises the following steps: building a microwave detection platform, and carrying out fixed frequency sweep detection on a reinforced concrete structure to obtain S parameter data with reinforcement corrosion condition information; dividing the S parameter data into a training set and a test set; extracting frequency and S parameter data of the reinforcing steel bars under different corrosion degrees, and training the random forest algorithm model by taking the frequency and S parameter data as input features and the reinforcing steel bar corrosion depth as output features; and performing microwave detection on the reinforced concrete structure, and inputting the obtained frequency and S parameter data into the trained random forest algorithm model to obtain the corrosion depth of the reinforcing steel bar. According to the concrete structure reinforcement corrosion detection method based on the random forest algorithm and the microwave scattering parameters, prediction of the reinforcement corrosion depth is achieved, and the method has the advantage of being high in accuracy.

The present application belongs to the technical field of concrete preparation detection, and particularly relates to a concrete aggregate water content detection device, which comprises a base and a rack installed above the base. A controller is installed on the side wall of the rack. The device further comprises a through hole opened in the top of the base, a support seat slidably connected inside the through hole, and a weighing mechanism installed inside the through hole for supporting the support seat. A flat hopper is arranged above the base and located on the side of the feed end direction of the support seat. The rack is provided with an adjusting drive mechanism for driving the vertical movement of the flat hopper. A microwave detection unit is arranged on one side of the flat hopper. The present application can perform online detection of the water content of concrete aggregate, improve the detection accuracy by combining weight detection and thickness control, reduce single detection interference error by cross verification of multiple sensing data, and improve data reliability to support subsequent dynamic batching.

1. Name of the product in this design: Sensor. 2. Application of this design: To achieve automatic control of lighting fixtures by detecting human and vehicle activities or light through microwave detection, for use in tri-proof lamps, incandescent lamps, fluorescent lamps, LED lamps, etc. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention provides a cold welding and over-welding microwave detection method and device for a PE pipe hot-melt weld, and the method comprises the steps: carrying out the axial microwave scanning of the PE pipe weld meeting the requirements across the weld to obtain a series of reference comparison data, scanning the base metal of the to-be-detected PE pipe weld to obtain the parameters of the base metal, carrying out the circumferential scanning, and carrying out the welding of the to-be-detected PE pipe weld; the method comprises the following steps of: finding out a corresponding suspected point, axially scanning the suspected point to obtain a target data matrix for judging cold welding and over welding, solving a measurement parameter by combining a corresponding algorithm, comparing the measurement parameter with an optimal parameter of a normal PE pipe welding seam, and making a final judgment according to a comparison result. The provided device is used for guaranteeing the detection precision, and the detection method and device can accurately identify cold welding and over-welding defects, can be suitable for PE pipes of different manufacturers and different specifications, and are higher in identification efficiency.

The utility model provides an intelligent device based on microwave detection, the intelligent device based on microwave detection comprises a mounting plate and an antenna, the mounting plate is provided with a metal surface formed on one surface of the mounting plate and is provided with an antenna port, the antenna is arranged in the antenna port, and an expansion reference ground can be formed by means of the metal surface. Therefore, the reference ground area of the antenna is expanded, and the occupied area of the antenna on the mounting plate can be reduced.

This invention discloses a microwave detection method for wellbore rock humidity in gas drilling, comprising the following steps: S1: Establishing a near-bit annular space microwave propagation model based on the annular structure of the gas drilling well and the properties of the rock wall interface; S2: Establishing a microwave reflection coefficient calculation model for the wellbore rock wall interface based on the near-bit annular space microwave propagation model; S3: Establishing a quantitative calculation model for the change in microwave reflection coefficient of the wellbore rock wall under low humidity conditions near the drill bit, based on the microwave reflection coefficient calculation model; S4: Establishing a simulation model for microwave reflection of the wellbore rock wall under low humidity conditions based on the quantitative calculation model; S5: Performing simulations across the entire frequency band according to the simulation model to determine the most reasonable band for the microwave detection method of wellbore rock humidity in gas drilling. This invention enables effective ultra-fast dynamic monitoring of humidity changes during drilling in low humidity ranges.

The invention relates to an online detection device and method for the moisture content of an aromatic line of a cigarette filter stick. The device comprises a guide assembly, one end of which is used for guiding an incense line impregnated with perfume from a perfume barrel, and the other end of which is used for guiding the incense line out to a filter stick forming cigarette gun; the guide assembly is used for folding the incense lines into a plurality of strands of non-intersecting incense lines and conducting the incense lines; the microwave resonant cavity is used for transmitting a microwave detection signal with a preset microwave frequency to an incense line area in the cavity; the radio frequency detection module is used for detecting a microwave response signal of the incense line area aiming at the microwave detection signal and acquiring a water content map of the incense line according to the microwave response signal; the data processing module is used for comparing the water content map of the incense line with a standard water content map corresponding to a preset microwave frequency to obtain the water content of the incense line in the incense line area; according to the water content of the incense lines in the incense line area and the length of the incense lines in the incense line area, the water content of the incense lines in the incense line area is obtained. The device can improve the detection accuracy of the water content.

The invention provides a self-adaptive anti-interference composite induction alarm method, and relates to the technical field of self-adaptive anti-interference, and the method comprises the steps: carrying out the modal decomposition of a vibration signal through a vibration decomposition model, calculating a vibration signal decomposition optimization index, carrying out the optimization of a parameter of a recognition model according to the vibration signal decomposition optimization index, and carrying out the recognition of the vibration signal. The method comprises the following steps: acquiring target characteristics of a modal component, calculating dynamic unfamiliar attributes in a time period formed by multiple window times through a sliding window method, detecting a to-be-early-warned region by setting microwave emission initial parameters, performing time-frequency domain analysis on an echo signal, and calculating the detection quality of the echo signal, thereby realizing early warning of the to-be-early-warned region. The method comprises the following steps: optimizing microwave emission parameters through a microwave optimization model, obtaining an optimal echo signal, establishing a feature recognition model, respectively outputting feature recognition data, carrying out composite early warning, and automatically adjusting diffraction waves for detection when an obstacle shielding a microwave signal appears in microwave detection.

This invention discloses a method for monitoring the hydration process of concrete using near-field microwaves, relating to the field of concrete forming monitoring. The invention first prepares concrete samples according to the specified method for the corresponding concrete. Then, the probe of the near-field microwave detection device is inserted 0.5-1 mm below the sample surface to obtain the resonant frequency fr, quality factor Q, phase P, and transmission coefficient S. 21 The curves corresponding to fr(t), Q(t), P(t) and S are... 21 (t); Differentiating each curve yields f'(t), Q'(t), P'(t), and S'(t); Zeros in f'(t), Q'(t), P'(t), and S'(t) represent critical points of state change during concrete hydration. Zeros in f'(t), Q'(t), P'(t), and S'(t) are determined respectively; the critical points of state change during concrete hydration are determined by averaging one or more of the curves f'(t), Q'(t), P'(t), and S'(t). Compared with existing technologies, this invention has the advantages of simple operation, low cost, adjustable detection accuracy, fast response speed, in-situ detection capability, and strong universality.

The application provides an anti-interference microwave detection method and a microwave detection device, wherein the anti-interference microwave detection method can avoid using multiple filtering methods to accurately eliminate interference signals in the corresponding Doppler intermediate frequency signals, which have any frequency relationship with the local oscillator signal of the microwave detection device, such as the same frequency, adjacent frequency and multiple frequency, so as to guarantee the integrity of the Doppler intermediate frequency signals and the accuracy of the feedback of the Doppler intermediate frequency signals to the movement of the object in the corresponding detection space, which is beneficial to realize the combined detection of action characteristics such as human movement, micro movement, breathing and heartbeat, and the detection function of the microwave detection device is rich and suitable for intelligent detection applications with multiple functions.

The application discloses a kind of microwave perception detection method and system of liquid food pollutant based on machine learning, specifically: the theoretical model of microwave detection liquid food pollutant is established, antenna unit structure is designed;Detection area is demarcated on conveyor belt and sampling point position is set, the phase difference of each antenna unit to sampling point position is calculated, and the compensation phase of each antenna unit is designed;Array antenna is built in simulation software, and the focusing effect of array antenna is verified;FPGA control board is designed for array antenna, and the working state of each antenna unit is controlled using host computer, and the detection device is formed by integrating host computer, FPGA control board and antenna board;Test food before and after being contaminated, and construct the test data set of scattering parameters before and after food contamination;Machine learning model is established to detect whether liquid food is contaminated and the type of pollution.The application improves the success rate of food pollutant detection, and the detection range is wider and the detection capacity is stronger.

The invention relates to a device (10) for detecting the movement of a person (2) by microwaves for a motor vehicle (1), said device (10) comprising a radiation impedance module (110) configured to be powered by a DC voltage source (30) and comprising a detection antenna (112), a MOSFET transistor (114) and an impedance matcher (116) forming a closed-loop circuit, the closed loop circuit oscillates at a predetermined fixed frequency when the circuit is powered by a voltage provided by the DC voltage source (30).

The invention relates to the technical field of feed detection, and discloses a poultry breeding feed detection device which comprises a detection box body, a throwing feeding mechanism, a pneumatic impurity removal mechanism, an impurity removal port and a microwave detection sensor, and an inclined discharge port is formed in the bottom of the detection box body; the throwing and feeding mechanism is arranged at the upper part of the side wall of the detection box body and is used for feeding the feed into the detection box body according to a motion trail similar to a horizontal throwing motion trail; the microwave detection sensors are oppositely arranged on the two side walls of the detection box body and used for detecting the water content of the feed in the throwing process. The feed is in a discretized throwing state in the detection box body through the throwing feeding mechanism, and accurate moisture detection of the feed under the condition of no background interference is realized in cooperation with the microwave detection sensor arranged perpendicular to the motion trail of the feed.

A device for detecting movement of a person by microwaves for a motor vehicle, the device including a radiating impedance module configured to be powered by a DC voltage supply and including a detection antenna, a MOSFET transistor and an impedance matcher forming a closed-loop electrical circuit oscillating at the predetermined fixed frequency when the circuit is powered by the voltage provided by the DC voltage supply.

This invention relates to the field of microwave detection technology, specifically to a broadband microwave rapid detection method based on atomic level electric field tuning, which mainly solves the problem of detection limitations in traditional Rydberg atom-based microwave information detection. The broadband microwave rapid detection method based on atomic level electric field tuning includes the following steps: 1) First, a probe light and a coupling light are applied sequentially to a Rydberg atom gas cell, and then the microwave to be measured is applied to the Rydberg atom gas cell; 2) A spatial gradient radio frequency electric field is applied within the Rydberg atom gas cell; 3) The spot of the probe light is projected into an optical camera to form an image set, the pixel signals within the image set are merged, and the splitting response of the EIT-AT spectrum is observed. The electric field strength and frequency of the microwave to be measured are calculated. This invention's detection method achieves the requirement for rapid detection of random microwave signals over a wide frequency range.

The invention relates to the field of environment monitoring technology and water quality detection, and discloses a method for detecting the concentration of chloride ions in desulfurization wastewater. The detection method is based on a microwave detection technology, integrates a specific detection system of microwave sensing and precipitation reaction, only consumes a microliter sample in the measurement process, and can accurately test the content change of chloride ions in the desulfurization wastewater without complex operation; the method can realize high-sensitivity, portable and miniaturized detection of chloride ions in desulfurization wastewater, and the detection method has the advantages of complex matrix interference resistance, small sample usage amount, fast response (the detection time is less than or equal to 10s), wide detection range (the Cl <-> concentration is 100-20000 mg / L), corrosion resistance and low cost. By selecting proper precipitation reaction and measurement conditions, specific detection of different ions can be realized, and powerful technical support is provided for the fields of chemical analysis, environmental monitoring and the like.

The utility model discloses asphalt pavement disease detection equipment, which relates to the technical field of road detection and comprises a cart body, a base is mounted at the top of the cart body, a push rod is movably mounted on the base, and a handrail is fixedly mounted at one end, away from the base, of the push rod. A microwave detection device used for detecting pavement diseases is installed in the cart body, when the microwave detection device is used, the control parts are matched with the protection plates, the multiple sets of protection plates can rotate under the action of gravity and elastic force when the cart is in a non-operation state or is loosened, then the protection plates are automatically folded, and the microwave detection device is completely wrapped. According to the microwave detection equipment, the risk that the microwave detection equipment is moved, stored or impacted by hard objects in the intermittent period is effectively avoided, meanwhile, the protection plate can be driven to be opened by pulling the pull handle in the working period, the detection end of the microwave detection equipment can work, and therefore the microwave detection equipment can be effectively and conveniently protected in the working period and the non-working period.

The application discloses a kind of based on V B ‑ The quantum gas pressure sensor of color center includes gas pressure cavity, quartz plate with sample substrate, confocal scanning imaging mechanism and microwave detection mechanism with time sequence card, after being connected with the whole device of gas pressure sensor by gas pipe, measured V B ‑ The ODMR signal change of spin color center is obtained corresponding to the gas pressure intensity.The application also provides a use method.The sensor provided by the application utilizes the advantage of phonon-assisted enhancement when hexagonal boron nitride is suspended, has multiple times of photoluminescence enhancement compared with other regions, and can realize gas pressure sensing response with micron-level spatial resolution.

The invention discloses a warning lamp with a bird repelling function, and relates to the technical field of bird repelling warning, the warning lamp comprises an upper shell, a middle shell and a lower shell which are detachably connected in sequence, the upper shell is made of a light-transmitting material, a first control panel and a power supply assembly which are in signal connection with each other are arranged between the middle shell and the upper shell, and an LED light source is installed on the first control panel; a bird repelling assembly in signal connection with the first control panel is arranged between the middle shell and the lower shell. Wherein a magnet used for installing the warning lamp on external power supply equipment in a magnetic attraction mode is embedded in the bottom of the lower shell, the bird repelling assembly comprises a microwave detection module and a loudspeaker which are in signal connection with the first control panel, and the microwave detection module is used for detecting flying birds in a preset range and generating a trigger signal; the first control panel is used for controlling the LED light source and the loudspeaker to execute bird repelling warning actions after receiving the trigger signal transmitted by the microwave detection module. The bird repelling warning device solves the problem that a bird repelling warning device in the prior art is large in size.

The utility model provides a high-gain double-antenna microwave detection device, which comprises a reference ground, a planar radiation source, a half-wave oscillator and an auxiliary oscillator, and is characterized in that the planar radiation source and the half-wave oscillator are arranged on the same side of the reference ground; a near-field medium space is defined by taking a physical center point of the planar radiation source as a sphere center and taking lambda / 2 as an inner radius and 3 lambda / 2 as an outer radius in an error range of + / -lambda / 4; wherein the auxiliary oscillator is completely or partially arranged in the near-field medium space around the directional radiation direction of the high-gain double-antenna microwave detection device, and is provided with at least one metal layer around the directional radiation direction of the high-gain double-antenna microwave detection device; the high-gain double-antenna microwave detection device can maintain a large beam angle while improving the gain, and is suitable for high installation application.

The invention relates to the technical field of polyethylene pipeline welded joint defect detection, in particular to a non-contact variable-diameter microwave detection device and method for a polyethylene pipeline welded joint. The detection device comprises an axial movement control device, a profile support, an annular guide rail assembly and a circumferential detection device. The detection method comprises the following steps: controlling the axial moving device to enable the microwave probe and the welding joint to be coplanar; the laser transmitter measures the distance between the circumferential detection device and the detected pipeline in real time to ensure whether the two are concentric; the electric push rod changes the distance from the microwave probe to the detected pipeline as required; a hydraulic cylinder piston pushes the profile bracket to change the angle; different scanning modes such as spot scanning are executed according to different detection signals. The detection device provided by the invention has the advantages of variable diameter, quick installation, flexible and changeable detection modes, high operation portability and the like.