122 results about "Nondestructive measurement" patented technology

The invention discloses an ultrasonic orthogonal scanning measurement method for mechanical properties of a fiber reinforced composite material. The method comprises the following steps: aiming at a composite material unidirectional plate to be detected, fixing receiving (transmitting) points on the surface of one side of a material, positioning the transmitting (receiving) points on the surface of the other side of the material, performing linear scanning along any two orthogonal directions, and recording transmission quasi longitudinal wave and quasi transverse wave time domain waveform signals which are acquired by combining each pair of transmitting and receiving points and are propagated along different paths; establishing an acoustic model for quantitatively describing the quantitative relationship between the ultrasonic trend and the independent elastic constant, thickness and fiber direction angle of the to-be-tested fiber reinforced resin matrix composite so as to simulate an ultrasonic data acquisition experiment and generate a corresponding simulated ultrasonic data set; and updating the independent elastic constant, the thickness and the fiber direction angle value of the composite material by taking the similarity degree between ultrasonic data sets obtained by experiments and simulation as a target function. According to the invention, multi-parameter high-precision in-situ nondestructive measurement of mechanical properties, thickness and fiber orientation of materials can be synchronously realized.

The invention discloses a hollow-core optical fiber microstructure size dynamic nondestructive measurement and control system, which is characterized in that a spectral confocal detection module acquires spectral signals reflected by each interface of the cross section of a hollow-core optical fiber from the side surface of the hollow-core optical fiber by using a dispersion confocal principle in a hollow-core optical fiber drawing process, and converts the spectral signals into spectral data; the data analysis module outputs an axial peak value calculated value by using a neural network model according to the spectral data, and converts the axial peak value calculated value into the diameter of a nested glass tube in the nested structure unit; the regulation and control module outputs an airflow regulation instruction according to the difference between the diameter of the nested glass tube and a preset value; the airflow control module adjusts the size of airflow entering the hollow-core optical fiber according to the airflow adjusting instruction, and then the diameter of the nested glass tube is adjusted. According to the invention, the diameter of the nested structure unit in the hollow-core optical fiber can be accurately measured in the production process, and the technological parameters can be adjusted in time according to the product state.

The invention provides an electric pole burial depth nondestructive measurement system and method, and belongs to the technical field of power grid electric pole burial depth measurement, and the electric pole burial depth nondestructive measurement system comprises a wedge block arranged on an electric pole, and a first sensor, a second sensor and a third sensor which are sequentially installed along the axial direction of the electric pole from top to bottom below the wedge block, the detection equipment is in communication connection with the first sensor, the second sensor and the third sensor respectively; the contact face of the wedge block and the electric pole is a cylindrical face with the diameter being phi, the included angle between the knocked face of the wedge block and the contact face of the electric pole is theta, phi is smaller than or equal to 33 cm, and theta is larger than or equal to 50 degrees and smaller than or equal to 90 degrees. According to the technical scheme, not only can a standard electric pole be measured, but also the burial depth of a non-standard old electric pole can be accurately measured, whether the pole base buried in the ground is broken or not is judged, and the method is suitable for being popularized and applied to electric pole burial depth nondestructive measurement work.

The invention relates to the technical field of electric pole burial depth measurement, in particular to an electric pole burial depth nondestructive measurement method, system, equipment and medium, and the method comprises the steps: coaxially installing a first sensor and a second sensor on the side wall of an electric pole at a preset interval along the axial direction of the electric pole; impact excitation is applied to the side wall of the electric pole, vibration signals of the first sensor and the second sensor are synchronously collected, and a dual-channel time domain signal is obtained; calculating the wave velocity of the elastic wave in the current electric pole according to the arrival time difference of the head wave in the dual-channel time domain signal and a preset interval; based on the calculated wave velocity and the dual-channel time domain signal, performing signal processing and statistical analysis on a plurality of samples obtained by multiple times of measurement so as to identify the arrival time difference corresponding to the stable uplink reflected wave; and calculating the burial depth of the electric pole according to the identified arrival time difference and wave velocity of the uplink reflected wave. The method has the beneficial effects that the risk of high-altitude operation is thoroughly avoided through double-sensor side wall installation and intelligent algorithm decoupling.

To provide a coating degradation evaluation method capable of predicting the service life of coatings in actual use with higher accuracy than conventional methods, and a coating degradation evaluation device.SOLUTION: A coating degradation evaluation method includes the steps of: non-destructively measuring parameters changing with degradation in a coating having the same composition as an inspection target material under plurality of conditions; constructing a coating degradation database from the parameters changing with degradation, the coating degradation time, and the degradation environment temperature, and constructing a degradation estimation formula from the degradation database; non-destructively measuring the parameters changing with degradation in the inspection target material whose degradation has progressed during actual use; inputting the parameters changing with degradation in the inspection target material into the degradation estimation formula to calculate the degradation environment of the inspection target material whose degradation has progressed during actual use; and calculating the time until the inspection target material whose degradation has progressed during actual use is determined to have degraded.SELECTED DRAWING: Figure 1

The invention provides a portable non-contact soil compaction profile measurement device and method, and belongs to the field of soil profile measurement. The device comprises an infrared measuring device, a combined optical axis, an optical axis fixing seat and a folding fixing bracket, the infrared measuring device is arranged on the combined optical axis in a sliding manner, and non-contact accurate nondestructive measurement of the compaction contour of the soil to be measured is realized through an infrared distance measuring sensor arranged on the infrared measuring device; two ends of the combined optical axis are arranged on the optical axis fixing seat, and the combined optical axis comprises a plurality of detachable optical axis units which can be freely assembled to an ideal measurement width; the folding type fixing support is fixed to the optical axis fixing base through threaded connection, the device has the functions of folding, contracting, disassembling and assembling, the size of the device is remarkably reduced, and the device is convenient to carry in the field and rapidly deploy on site. The problems that traditional measuring equipment is large in size, inconvenient to carry and large in measuring error are effectively solved, and wide application value is achieved.

The application relates to the technical field of optical measurement, and discloses a semiconductor structure doping concentration distribution measuring system, which comprises an excitation module for generating excitation light; a light splitting module located on the light path of the excitation light and used for splitting the excitation light into first power light and second power light, wherein the first power light is used for irradiating a sample to be measured; a measuring module located on the light path of the second power light and used for measuring the power of the second power light; and a collecting module used for collecting the spectrum signal of test light generated by the sample to be measured under the excitation of the first power light. The embodiment of the application can realize non-contact and nondestructive measurement of the doping concentration distribution of a semiconductor structure.

The invention relates to a three-dimensional nondestructive measurement method for Lanzhou lily volume, which comprises the following steps: (1) optimal view selection: constructing Lanzhou lily multi-dimensional evaluation indexes by using information entropy, new point rate, color difference, global features and view angle redundancy, selecting an image with the maximum information entropy, adding an optimal view set, and selecting an optimal view; sending into a three-dimensional reconstruction model to obtain external parameters, internal parameters and a depth map of the camera, and constructing an initial point cloud through coordinate transformation; (2) constructing a comprehensive evaluation function, and selecting three optimal views from the candidate view set in an incremental iteration mode; (3) establishing a three-dimensional reconstruction neural network model comprising a structured coding layer, a dual-channel collaborative reasoning module and a plurality of special interpreters; (4) performing 3D feature extraction and volume prediction: extracting three types of shape features, namely shape parameters, geometric proportion parameters and shape indexes, of the Lanzhou lilium brownii; and then establishing a BPNN neural network model, and predicting the lily volume. The method has the characteristics of rapidness and high precision.

The invention relates to the technical field of circuit board depth control hole non-measurement, and provides a circuit board depth control hole lossless rapid measurement device and a measurement method.The circuit board depth control hole lossless rapid measurement device comprises a measurement table, a movable frame is fixedly connected to the top of the measurement table, a lossless measurement assembly is arranged in the movable frame, and a positioning mechanism is arranged at the top of the measurement table; through mutual cooperation among components such as a motor I, a threaded rod and a mobile platform, when a circuit board hole needs to be measured, a worker starts the motor I, drives the threaded rod to rotate, drives a threaded sleeve to move in a mounting groove, and further pushes the mobile platform, and after the circuit board is placed, the circuit board can be measured. When the circuit board is measured, the platform positions the circuit board to a working area of the nondestructive measurement assembly for measurement, measurement data is displayed through the data display screen, recording and analysis of workers are facilitated, the effect of positioning the circuit board is achieved through the design, and the measurement precision and the working efficiency of the circuit board are improved.

The invention belongs to the technical field of stress detection, and relates to a nondestructive measurement method and system for residual stress of a basin-type insulator. The method comprises the following steps: acquiring a transverse wave acoustic elastic birefringence coefficient and a dual-frequency longitudinal wave acoustic elastic coefficient of a standard test block made of the same material as an insulator in different uniaxial stress states; obtaining the transverse wave propagation time of the polarization direction of the target point in the annular direction, the transverse wave propagation time of the polarization direction in the radial direction and the dual-frequency longitudinal wave propagation time of the insulator in the state of no external load; and acquiring circumferential residual stress and radial residual stress at the target point according to the transverse wave acoustic elasticity birefringence coefficient, the dual-frequency longitudinal wave acoustic elasticity coefficient, the transverse wave propagation time of which the polarization direction is in the circumferential direction, the transverse wave propagation time of which the polarization direction is in the radial direction and the dual-frequency longitudinal wave propagation time. Nondestructive testing of the residual stress of the epoxy resin part of the basin-type insulator is achieved, and directional analysis and independent measurement of a complex stress field are achieved.

The invention discloses an electrically-assisted forming pure electroplastic effect measuring device and method based on contact type cooling. The device comprises a loading unit, an electrifying unit, a contact type cooling unit, a measuring unit and a control unit. The method is characterized in that a friction force calibration experiment is carried out, and system errors are quantified; then, under closed-loop temperature control, electrifying, deformation and dynamic cooling are synchronously carried out, so that the temperature of the sample is stabilized at the target temperature to completely offset the Joule heating effect; and finally, the measurement result is corrected based on the calibration data, the corrected electrified deformation data is compared with the thermal baseline data, and the difference value is the accurate quantized value of the pure electroplastic effect. According to the device and the method, the high-thermal-conductivity insulating ceramic chip is adopted for contact type cooling, the problem of material chemical pollution caused by liquid nitrogen injection is fundamentally avoided, system errors caused by contact are eliminated through an original friction force calibration and correction process, and in-situ, accurate and nondestructive measurement of the pure electroplastic effect of the material is achieved.

The invention relates to a device for the non-destructive measurement of a power supply line, including a shaft; a first transmitting coil and a second transmitting coil permanently formed partially around the shaft, the first and second transmitting coils defining a central plane between the first and second transmitting coils, and having a transmitting portion extending around the shaft close to the central plane on either side of the central plane, and a return transmitting portion extending around the shaft farther than the corresponding emitting portion from the central plane; and a receiving coil permanently formed partially around the shaft, the receiving coil having a receiving portion extending around the shaft located between the transmitting portions of the first and second transmitting coils, and a return receiving portion extending around the shaft offset from a position of symmetry of the transmitting portion with respect to the central plane.

The application discloses a kind of multi-thin-layer heterogeneous material elastic parameter in-situ nondestructive measurement method, medium and equipment, belong to ultrasonic measurement technical field.The method includes: for the structure to be measured, establish multi-mode ultrasonic propagation multi-parameter model, and calculate the propagation time theoretical value corresponding to each ultrasonic mode, the structure to be measured is multi-thin-layer heterogeneous structure;For the structure to be measured, laser ultrasonic linear scanning is carried out, and the ultrasonic signals of each ultrasonic mode propagating along different directions are collected to obtain linear scanning ultrasonic data set;For selected ultrasonic mode, the propagation time experimental value under different excitation-receiving point combinations is extracted in the ultrasonic signal of the linear scanning ultrasonic data set;For the selected ultrasonic mode, the difference between the propagation time theoretical value and the propagation time experimental value is used as the objective function to minimize, and the elastic parameters of the structure to be measured are inverted using parameter optimization algorithm.The application can realize long-distance, non-contact in-situ nondestructive measurement, and simple operation.

The invention relates to a nondestructive measurement and analysis method and system for a structure and components of a nano-film. The method comprises the following steps: firstly, carrying out angle-resolved photoelectron spectroscopy test on a to-be-tested film at different emergent angles, and fitting energy spectrums of different angles and elements to obtain a fitting result; analyzing the result to obtain chemical components and a preset film layer structure sequence, and establishing an initial film structure model; fitting a GIXRR experiment curve based on the current model, and obtaining structure parameters such as the thickness, the density and the interface roughness of a film layer; model parameters are input into an ARXPS simulation program, and a simulation result containing thin film electric field intensity and photoelectron intensity of different chemical components is output; analyzing whether the structure parameters and the simulation result are matched with the fitting result, if not, optimizing the model and repeatedly fitting, and if yes, outputting the current model as the structure and component analysis result of the to-be-tested film. Compared with the prior art, the method has the advantages of high analysis result accuracy, high reliability and the like.

The application discloses a kind of steel pipe concrete compactness detection device and detection method, it is related to steel pipe concrete nondestructive testing technical field, including lower fixed frame and upper fixed frame, interface of lower fixed frame and upper fixed frame is fixedly installed with connecting lug, connecting lug is connected by bolt;And the inner side wall of lower fixed frame and upper fixed frame is equally spaced and installed with first telescopic rod, horizontal motor is installed on the first telescopic rod located in lower fixed frame, longitudinal motor is installed on the first telescopic rod located in upper fixed frame;The upper surface of lower fixed frame is provided with T-shaped guide rail, T-shaped guide rail is slidably connected with the lower end of connecting plate, the upper end of connecting plate is fixedly connected with upper fixed frame;The inner side wall of connecting plate is respectively oppositely installed with ultrasonic nondestructive measurement assembly and knock measurement assembly.The application discloses a kind of steel pipe concrete compactness detection device and detection method, realize to steel pipe concrete column carries out two-dimensional non-destructive, high-precision measurement, and speed up measurement progress.

The utility model discloses a plastic pipe external diameter laser measuring device, which comprises a spacing-adjustable supporting wheel, a rotation driving mechanism and a double-laser measuring head assembly, the supporting wheel adopts a V-shaped rubber rim structure to prevent axial displacement and surface scratch of a pipe, a rotation disc triggers a laser head through a magnetic encoder to acquire data at an equal angle interval of 0.1 degree, and the rotation driving mechanism is connected with the double-laser measuring head assembly. High-density uniform sampling is realized by combining closed-loop control of a servo motor; the three-axis measuring platform is provided with an electric adjusting mechanism, the laser head is automatically adjusted to the optimal focusing distance according to the initial measuring value, and the data processor dynamically optimizes the sampling frequency and calculates the ellipticity deviation. The device has the advantages that the influence of rotating speed fluctuation is eliminated through an angle triggering mode, the V-shaped supporting structure is matched with a DN 20-300 mm pipe, high-precision nondestructive measurement is guaranteed through a rubber protection layer and an automatic focusing mechanism, and the device is suitable for rapid detection of a continuous production line.

The invention provides a single wood volume nondestructive measurement method based on a foundation laser radar, belongs to the field of single wood volume, and focuses on feature extraction of trunk structures in different forms and calculation of the trunk volume. According to the method, masson pine is taken as a research object, 52 individual trees are taken as samples, true values of different height diameters are acquired, the volume of the individual trees is calculated, and meanwhile, a high-density three-dimensional laser point cloud is scanned by using a foundation laser radar system. The method comprises the following steps: firstly, sampling original point cloud data, constraining growth of seed points by using normal vectors and angles, and accurately extracting trunk point clouds; simulating interception of a real disc through point cloud slices, and calculating a single-layer point cloud area by using an improved convex hull algorithm; in the shielded region, constructing a fitting circle by using the local point cloud to calculate the area of the layer; and finally, the single wood volume is obtained through the thought of an infinitesimal method. The correlation R2 between the calculated wood volume and the real calculation reaches 0.995, the RMSE is 0.017 m < 3 >, and the nRMSE is 2.38%, which indicates that the tree trunk can be accurately extracted and the single wood volume can be calculated under the non-contact condition.

The application discloses a self-absorption correction method and device for unknown component radioactive samples, belongs to the technical field of radioactive source detection, and places a gamma radioactive source in a groove at the upper end of an upper fixed plate, so that the gamma radioactive source serves as a photon source; places an empty sample cylinder at the upper end of a lower fixed plate, at this time, the photons emitted by the gamma radioactive source pass through the cylinder through the channel in the inner lead body and are then received by a detector, and the peak area net count rate N1 corresponding to the ray energy is calculated by spectrum analysis. When the application is used, nondestructive measurement can be achieved, compared with the traditional X-ray fluorescence method (XRF), the application does not need to destructively process the radioactive substances to be detected to obtain a sample matrix, and can truly realize nondestructive measurement; the cost is reduced; the traditional method needs to use X-ray fluorescence to detect the sample components, and the method further increases the cost, and the application only needs a lead collimator to realize all functions, and the cost is further reduced.

The invention relates to the field of agricultural plant protection machinery and plant phenotype research equipment, in particular to an intelligent spray tower system based on biomass recognition and a control method. The system comprises a modular shell, a pressure device, a pesticide applying device, a fresh weight measuring device, a physiological signal collecting unit, a waste liquid classifying and degrading assembly, an AI parameter self-adaption module, a remote monitoring module and a computer control panel. The fresh weight measuring device is additionally provided with a double-view-angle dynamic adjusting module, and image acquisition of plants in different forms is adapted through a laser distance sensor and a stepping motor. The physiological signal acquisition unit acquires leaf humidity and pore diameter in real time and feeds back optimized pesticide application parameters; the waste liquid classified degradation assembly realizes harmlessness of the waste liquid through classified filtration and microbial degradation; the AI module adaptively adjusts parameters based on a random forest algorithm, and the remote module supports data sharing and fault early warning. According to the invention, high-efficiency cooperation of accurate spraying and nondestructive measurement is realized, and the method is suitable for scenes such as plant protection efficacy tests and plant phenotype research.

This invention relates to the field of optical measurement technology, specifically to a device and method for detecting the beam-splitting surface parameters of waveguide sheets. The device includes an autocollimator and a measurement platform. The measurement platform is used to place and realize the translation and rotation of the waveguide sheet under test. The autocollimator is tilted above the measurement platform, with its center line coplanar with the rotation axis of the measurement platform, and its tilt angle relative to the rotation axis of the measurement platform is equal to the characteristic angle of the beam-splitting surface. The autocollimator is used to measure the angular parameters of each beam-splitting surface in the waveguide sheet under test during rotation or translation. In this invention, by placing the waveguide sheet under test on the measurement platform, the angular parameters of each beam-splitting surface of the waveguide sheet under test are measured using the autocollimator during the rotation or movement of the measurement platform. Therefore, this device can achieve non-destructive measurement of each beam-splitting surface of the waveguide sheet under test. This allows for the early rejection of defective products, improving production efficiency and reducing production costs.

The present application relates to the technical field of image data processing, and discloses a corn kernel and embryo volume high-throughput visual analysis method and system based on deep learning, which can obtain at least one folder according to a file input path set by a user, and each folder includes a gray scale sequence obtained by computer tomography (CT) slicing of corn kernel groups in a horizontal direction. Based on a parallel pipeline processing mode, a set batch size and a deep learning segmentation model, the gray scale sequence in the folder is preprocessed and image segmented to obtain kernel binary segmentation mask sequences and embryo binary segmentation mask sequences, and then the kernel quantity and the volume related data of the kernel and the embryo are determined, and the related images and data are visually output. The present application can complete the processing of the high-throughput data of the CT slice sequence of the corn kernel, and the nondestructive measurement and visual display of the volume related data of the kernel and the embryo, and effectively improve the measurement efficiency.

This invention provides a method for determining the dislocation density of diamond single crystals using cathodoluminescence spectroscopy, which can be applied to the field of semiconductor material characterization and defect detection. This method draws upon and develops upon colorimetric methods based on ultraviolet light intensity, utilizing the idea of ​​single measurement and quantitative analysis based on different peak ratios. It also incorporates a decoupled architecture of "destructive calibration + non-destructive measurement." First, at least five diamond single crystal calibration samples with gradient dislocation densities are selected. Cathodoluminescence spectra are acquired under low temperature and high vacuum conditions. The integrated intensity I of the A-band emission peak related to dislocations is extracted through multi-peak fitting. A and the integral intensity I of the free exciton emission peak FE Calculate the ratio R=I A / I FE Subsequently, the calibration sample was subjected to hydrogen-oxygen dry etching, and the surface dislocation density N was obtained by statistically analyzing the etching pits. The proportionality coefficient k was obtained by linear fitting with N as the ordinate and R as the abscissa. For the sample to be tested, the spectrum was collected under the same conditions and the ratio R was calculated. Substituting this value into the model N=k·R, the surface dislocation density can be quantitatively obtained.

The present invention discloses a method for measuring the thickness of a surface treatment layer, comprising the following steps: obtaining standard normal distribution curves corresponding to different metal elements in standard samples of surface treatment layers of different thicknesses, wherein the normal distribution curve represents the relationship between the element content and probability density of a certain element at a certain thickness; obtaining sample normal distribution curves corresponding to each metal element in the sample to be tested; and obtaining surface treatment layer thickness values ​​calculated based on the different metal elements in the sample to be tested based on the standard normal distribution curves corresponding to each metal element at different standard thicknesses and the sample normal distribution curves corresponding to the corresponding metal element in the sample to be tested, thereby obtaining the surface treatment layer thickness of the sample to be tested. This method can achieve rapid and non-destructive measurement of the thickness of the surface treatment layer, is not limited by the measurement area, and has no significant restrictions on the materials of the sample substrate and the surface treatment layer to be tested, thus having wide applicability.

The application belongs to the technical field of seedling quality grading, and discloses a quality grading method for Platycladus orientalis seedlings in situ based on electrical impedance spectroscopy, which comprises the following steps: a Platycladus orientalis seedling in-situ measurement device is built for non-destructive measurement of root EIS in situ; an EIS-100 system is used to measure EIS parameters; based on a GSFS-FCM algorithm, input data are clustered, and the optimal cluster number K and the optimal cluster center coordinate matrix are output; according to the optimal cluster number K and the optimal cluster center coordinate matrix, the final membership degree is calculated and the classification is divided through the FCM algorithm, the quality grade to which the Platycladus orientalis seedling belongs is output, and the whole process from electrical impedance measurement to quality grading is completed. The above-mentioned grading method is adopted, the GSFS-FCM algorithm can automatically determine the classification number, automatically find the cluster center, reduce the iteration number of the algorithm, has high accuracy, and breaks away from the traditional grading method which relies on morphological parameters of the aboveground part.

The invention relates to a thin-wall bearing radial dimension dynamic measurement system and method based on an annular laser array, and relates to the technical field of precision measurement, and the system comprises a device housing, one side of the device housing is provided with a sensor array, one side of the sensor array is provided with an annular support, one side of the annular support is provided with a rotating platform, and one side of the rotating platform is provided with an annular laser array. A bearing mounting clamp is arranged at the center of the rotating platform, a vibration isolator is arranged at the bottom of the rotating platform, a data acquisition module is arranged in the rotating platform, a constant-temperature liquid cooling circulating pump is arranged on one side of the data acquisition module, and a man-machine interaction terminal is arranged on one side of the device shell. The measuring method comprises the steps that S1, an instrument is initialized; s2, clamping and positioning the tested bearing; s3, dynamic measurement and phase compensation; s4, reconstructing a three-dimensional shape; and S5, precipitation of a measurement result, through the above design, the measurement precision and efficiency are improved, nondestructive measurement is realized, and the environmental adaptability is enhanced.

The utility model relates to a nondestructive measurement device for the surface of a target object. The device comprises a first light source, a lens, a linear dichroscope, a first image sensor and a second image sensor, the first light source emits first exciting light to a target object with a photoluminescence material, and the characteristic that the transmittance of the linear dichroscope is increased along with the increase of the wavelength is utilized; image processing is carried out on a first gray level image of target object detection light which is obtained by a first image sensor and penetrates through a linear dichroscope and a second gray level image of target object detection light which is obtained by a second image sensor and reflects the linear dichroscope, a mass center spectrum of each point of a target object is obtained, and then surface information of the target object is obtained. Through the non-contact detection device, physical damage to the electrode and the surface of the Micro LED chip caused by the probe can be avoided, so that wafer-level Micro LEDs can be detected so as to intercept dead pixels, and the yield of Micro LED display screens is improved.

The invention discloses a nondestructive measuring device for the circumference of a tobacco stem of a tobacco plant. The device comprises a handle, a measuring unit, a centering unit and a control unit, the measuring unit is provided with an annular support capable of being opened and closed and a measuring probe capable of moving along the closed support, and surrounding measurement from the side of the tobacco stem is achieved. The centering unit comprises at least three radial centering rods with pressure sensors; the control unit controls the centering rod to stretch out and draw back synchronously according to pressure feedback, automatically positions the tobacco rod in the center of the measuring ring, drives the probe to scan and obtain tobacco rod contour data, and calculates the perimeter. According to the device, the problem that field operation is inconvenient is solved through an opening and closing type annular structure, manual centering errors are eliminated through active force feedback centering, high-precision and full-perimeter nondestructive measurement is achieved through non-contact rotary scanning, and an efficient and reliable automatic tool is provided for tobacco plant growth phenotype research.

The present application provides a kind of based on harmonic signal's multiple thermal physical parameter nondestructive measurement system and method, it is related to material's thermal physical parameter measurement technical field.The present application includes fractal flexible sensor, signal processing module and data analysis module, using fractal flexible sensor direct contact the test scheme of material to be measured, based on the side length correction radius of fractal flexible sensor, and based on multiple thermal diffusion model obtains multiple thermal physical parameters of material to be measured, constructs multiple model integrated framework, realizes the simultaneous nondestructive measurement of thermal conductivity, bulk heat capacity and the contact thermal resistance between each layer of material, reaches the delicacy demand of measurement technology for the product of multilayer material stack, simultaneously through the Peano curve design of sensor unit, the anti-interference ability of fractal flexible sensor for uneven surface measurement is enhanced, and through the structure design of fractal detection unit and fractal heating unit, the interference caused by bending deformation is inhibited, and the anti-interference ability of system is improved.

The application relates to the field of non-destructive measurement and verification and authentication of nuclear material properties, and particularly relates to a fast neutron multiplicity measuring device with active and passive measuring functions. The fast neutron multiplicity measuring device with active and passive measuring functions comprises a fast neutron detector, a sample container, a neutron generator and a neutron source shielding cone. The fast neutron detector is in a ring array structure. The sample container is arranged in a central measuring area. The neutron generator is arranged at the end of the ring array. The neutron generator has an alpha timing function. The neutron source shielding cone is arranged between the neutron generator and the fast neutron detector. The fast neutron multiplicity measuring device can realize the functions of active and passive fast neutron multiplicity measurement without changing the existing components of the device.