452 results about "Nondestructive measurement" patented technology

The invention discloses a method for non-damage measuring the tea polyphenol content in tea, based on near-infrared spectrum technique, which comprises that first building a correct model, collecting tea sample as correct sample group, scanning the correct sample group to obtain visible light spectrum and near-infrared light spectrum (325-2500nm), processing spectrum pretreatment on the spectrum data, then using international standard method to measure the tea polyphenol content of correct sample, using multi-element correct regression algorism to build the quantitative relationship between the near-infrared spectrum and the tea polyphenol content of the correct sample, to build the correct model. The invention only needs to scan the near-infrared spectrum of object tea, and input pretreated spectrum data into the correct model which can test the tea polyphenol content. The whole process is controlled by a computer, to realize data pickup, store, display and process functions.

The invention discloses a method for utilizing a laser ultrasonic wave to precisely measure a third order elastic constant of metal. The method comprises the following steps: respectively measuring wave velocities of a longitudinal wave, a transverse wave and a surface wave excited by a laser under stress-free state and stress state; utilizing the wave velocities of the longitudinal wave, the transverse wave and the surface wave measured under stress-free state to calculate a second order elastic constant and a density of metal according to a sonic elasticity theory and a Rayleigh equation; utilizing the ultrasonic wave velocities of the longitudinal wave, the transverse wave and the surface wave measured under stress state to introduce an equivalent second order elastic constant and an independently measured linear coefficient of thermal expansion; and lastly, calculating the third order elastic constant according to the sonic elasticity theory. According to the method, a pulse laser source is utilized to excite a sound surface wave, non-contact exciting is performed under a thermal elastic system and an overheated phenomenon of materials is avoided, so as to realize nondestructive measurement. A large amount of sound surface wave data spread for different distances is collected and a correlation function is utilized to calculate a wave velocity of the sound surface wave and a spread distance of sound wave, thereby greatly reducing error of arriving time value of the sound surface wave and promoting the measuring precision of a sound wave velocity.

The invention discloses a measuring device and a measuring method for alternating stress of a ferromagnetic component, is used for measuring the stress direction and the stress intensity of the ferromagnetic component, and belongs to the field of nondestructive measuring technologies and devices. The measuring device comprises a signal excitation module, an excitation probe, a detecting coil, a signal conditioning module, a signal acquisition module and a computer signal processing analysis module. The measuring device and the measuring method disclosed by the invention have the substantial characteristics that a to-be-detected component is magnetized by utilizing a U-shaped probe with an alternating signal, so that stress area is enough in secondary induced magnetic field, and then, an induced magnetic field of representing stress information is picked up by the detecting coil, and therefore, the goal of identifying the stress is achieved. According to the measuring method, by utilizing a set of detecting systems, not only can the stress degree of the surface and the near surface of the ferromagnetic component be evaluated but also the major stress direction in the component can be determined. The measuring device and the measuring method for the alternating stress of the ferromagnetic component are wider in application prospect.

The invention discloses a pipeline inner surface detection system based on a circular structured light vision sensor, and belongs to the field of nondestructive measurement. The system comprises a circular structured light projector and a camera which are arranged in a pipeline, wherein the camera is externally connected with an image acquisition card and connected to a computer through cables. The system is characterized in that: the camera and the circular structured light projector are arranged along the axial direction of the pipeline, and the optical center of the camera is aligned with the central axial direction of a conical curved surface; and the axial direction between the camera and the structured light projector is greater than l, and l is more than r/2/tanA, wherein r is the inside diameter of the pipeline, and A is a divergent half cone angle of the structured light projector, so that projected circular structured light bars can be shot by the camera. By utilizing axial placement of the camera and a laser, the volume of the vision sensor is effectively reduced, and three-dimensional measurement on a limited space in the pipeline is realized. Three-dimensional information of the whole sections of the pipeline can be acquired by measuring each pipeline section once, the complexity of a single-point measuring and scanning device is avoided, and the measurement speed is improved.

The invention discloses integration equipment and a detection method for evaluating coating bonding strength based on interface fracture toughness, belonging to the technical field of material surface engineering. With the equipment, a computer is used for controlling operation of four functional modules, including an ultrasonic detection module, a hardness testing module, a continuous press-in testing module and an interface crack detecting module; a man-machine interactive software system is used for processing acquisition and transmission of data of the functional modules and analysis operation and data display and output of an interface press-in mechanical model in an integrated manner; and through ultrasonic nondestructive measurement on elasticity modulus of a coating and a matrix and continuous press-in testing on a coating-matrix interface, quantitative detection on all parameters of an interface fracture toughness formula is completed in one equipment, and the critical load PC of coating-matrix interface fracture and the corresponding interface fracture toughness Kca are obtained. The equipment and the detection principle are clear, the modular design is beneficial to updating and expanding of a mechanical model library, and a detection sample is simple and convenient to prepare.

A system for measuring the range to an RFID tag including situations containing high clutter and multi-path signals is disclosed. The system includes an RFID reader; an RFID tag; and a coordinated pulse compression radar system. In the system the RFID reader causes the tag to respond to received signals in a first backscatter state at a first time and a second backscatter state at a second time. The pulse compression radar system transmits short pulses coordinated by the backscatter state of the RFID tag and the system creates a differential signal comprised of the differences between radar signals obtained during the first and second states of the tag to obtain an uncorrupted measure of a round trip time of flight of said radar pulses between the pulse radar system and the RFID tag.

The invention discloses a hand-held soil nutrient quick nondestructive measurement system. The system comprises a microprocessor, a liquid crystal display, a light source, a near infrared spectrum module, a keyboard, a data memory, a power supply and a Y-type optical fiber, wherein, the microprocessor is connected with the near infrared spectrum through a RS232 serial interface circuit; the power supply supplies electricity for the microprocessor, the liquid crystal display, the light source, the near infrared spectrum module, the keyboard and the data memory respectively; the tail end of the Y-type optical fiber is a spectrum acquisition probe, while the other two ends are connected with the light source and the near infrared spectrum module respectively. The system can measure the most main nutrient information of the soil, including nitrogent content, phosphorus content, kalium content and organic matter content. carrying out spectrum acquisition and processing through the near infrared spectrum module and the microprocessor, the system makes up the defect that the traditional large near infrared spectrometer can only be used indoors, and is not suitable for carrying in the field; and the whole device is less than 1kg in weight, is convenient for carrying, and can meet the requirement of quickly measuring the soil nutrient in the field.

The invention discloses an automatic ultrasonic C scanning detection system for an annular forging. The detection system comprises a mechanical scanning control unit, an automatic control mechanical scanning device, a rotary work platform, a water supply and drainage device, a water spray coupling device, an ultrasonic detection probe, an ultrasonic flaw detector and a communication unit thereof, data acquisition equipment and a C scanning nondestructive measurement unit, wherein the mechanical scanning control unit provides synchronous signals for the C scanning nondestructive measurement unit and controls the motions of the mechanical scanning device and the rotary work platform so as to drive the detection probe mounted in the water spray coupling device to scan; the water supply and drainage device is arranged on the edge of the rotary work platform so as to supply and drain water in real time; the ultrasonic flaw detector transmits and receives pulses through the detection probe and conveys detected echo information to the C scanning nondestructive measurement unit through the data acquisition equipment to perform imaging analysis. By adopting the system disclosed by the invention, the problems in ultrasonic detection of the annular forging with a complicated structure can be solved so that the imaging is accurate and visual.

The invention discloses a system and a method for measuring temperature in real time based on thermoacoustic effect. A thermoacoustic signal of a detected material is detected by using thermoacoustic imaging equipment; a relation parameter of the temperature of the detected material and the thermoacoustic signal amplitude value is obtained by data fitting; during actual temperature measurement, by using the known fitting parameters and through the relation of the temperature of the detected material and the thermoacoustic signal, the temperature of the detected material is obtained by reversely deducing and analyzing by using a one-dimensional thermoacoustic signal; and finally a temperature distribution figure is displayed on a computer in real time. Combined with the advantages of thermoacoustic technology, the system and the method for measuring the temperature in real time based on the thermoacoustic effect have high accuracy and high spatial resolution, and can quickly obtain temperature change parameters and the temperature distribution figure in real time under the condition of no damage, wherein the temperature measurement accuracy can reach 0.2 DEG C, so a reliable monitoring method and a system device are provided for real-time and nondestructive measurement of material temperature.

The invention discloses a method for detecting the anti-seepage effect of an anti-seepage film, belonging to the anti-seepage detection field of anti-seepage films. The method comprises the following steps: adopting a high-pressure pulse power supply to apply electric potentials onto the upper side and the lower side of the anti-seepage film by current electrodes the positions of which are fixed; arranging a fixed electrode and a movable electrode in an upper detection region of the anti-seepage film, wherein the position of the fixed electrode is fixed; and distributing detection points at 1-5m *1-5m intervals by the movable electrode. In measurement, a high-pressure pulse is applied onto the current electrodes to measure an electric potential difference between the movable electrode and the fixed electrode until all measuring points are measured; and the distribution of the electric potential differences is distorted in loophole positions so as to judge the existence and the positions of leakage. The invention is a nondestructive measurement method and has high detection precision and simple and convenient operation.

The present invention is non-destructive film thickness measuring method for multilayer film structure in SAW device. The measuring method includes first determination of measurement coefficient k of the measured film sample, subsequent measurement of the total thickness h of the measured film sample, and final calculation of thickness of the measured film based on the formula hfilm=hsubstrate-hsample. The measuring method of the present invention is based on parallel plate capacitor micro measurement principle and has measurement precision up to 1 nm. The method is simple non-contact measurement with low cost and is suitable for the measurement film thickness and film parallelism of various kinds of multilayer film structure.

Non-invasive THz spectroscopic apparatus and methods are provided for measuring the average diffusion coefficients for a structure such as cork. The methods may be used to image the localized presence of water in the structure to produce time-dependent images of liquid propagation in the structure.

The invention discloses a memory alloy phase-change temperature measuring method. The measuring method comprises the following steps: firstly measuring a sound velocity-temperature curve in which the velocity of ultrasonic longitudinal waves in a memory alloy to be measured changes along with the temperature, wherein the sound velocity-temperature curve comprises a heating curve and a cooling curve; and determining the phase-change temperature of the memory alloy to be measured according to the sound velocity-temperature curve by using the sensitivity of the ultrasonic longitudinal velocity on the phase-change process of the memory alloy. The invention also discloses a measuring system implementing the measuring method. The measuring system comprises an ultrasonic wave emitting and receiving module, a signal collecting and analog-to-digital converting module, a sample temperature adjusting module and a control and data processing module. According to the measuring method and the measuring system, the phase-change temperature of the memory alloy is measured by using the sensitivity of the ultrasonic longitudinal wave velocity on the phase-change process of the memory alloy; compared with the prior art, the measuring method and the measuring system have the advantages of high sensitivity, strong reliability, wide application range and nondestructive measurement.

The invention relates to an estimation method for the content of copper in soil on the basis of visible-light near-infrared spectrum technology. The estimation method is realized by the following six steps: (1) collecting a soil sample; (2) determining a visible-light near-infrared spectrum; (3) pretreating the spectrum; (4) determining the reference value of the content of copper in soil; (5) establishing an estimation model; and (6) estimating the content of copper in an unknown soil sample. The estimation model between the visible-light neared-infrared reflectivity spectrum and the content of the copper is established by utilizing a wavelet neural network method on the basis of the visible-light near-infrared spectrum technology, so that the visible-light neared-infrared reflectivity spectrum of the unknown soil sample is substituted into the estimation model and further the content of the copper in the unknown soil sample is determined. The estimation method has the advantages that the determination can be performed without direct contact with the sample, and is complete non-destructive measurement, the operation process and the calculation method for the content of the copper in the soil are simple, the determination speed is greatly enhanced, no other chemical reagents need to be added and the like, so that the estimation method is environmental-friendly and pollution-free.

A system for measuring range to an RFID tag including situations containing high clutter and multi-path signals is disclosed. The system includes an RFID reader; an RFID tag; and a coordinated signal compression radar system. The reader causes the tag to respond to received signals in a first backscatter state at a first time and a second backscatter state at a second time. The signal compression radar system transmits signals coordinated by the backscatter state of the tag and creates a differential signal comprised of the differences between radar signals obtained during the first and second states of the tag to obtain an uncorrupted measure of a round trip time of flight of said radar signals between the radar system and the RFID tag. The radar may use signals typical of pulse compression radar systems such as chirp modulation or Orthogonal Frequency Domain Modulation (OFDM), either pulsed or semi-continuous.

The invention discloses a method for measuring mechanical property of a cement-based material. By the method, dynamic modulus of elasticity and poisson ratios of a cement-based material at all age times can be synchronously calculated according to transmission speeds of ultrasonic transverse waves and ultrasonic longitudinal waves by continuously measuring the transmission speeds of the ultrasonic transverse waves and the ultrasonic longitudinal waves in a cement-based material test piece to be measured at all the age times. The invention also discloses a device for measuring the mechanical property of the cement-based material. The device comprises a cubic test die with an opening at the upper part, an ultrasonic longitudinal wave emitter, an ultrasonic longitudinal wave receiver, an ultrasonic transverse wave emitter, an ultrasonic transverse wave receiver and an ultrasonic wave signal processing unit, wherein the cubic test die is used for pouring the cement-based material test piece to be measured; the ultrasonic longitudinal wave emitter and the ultrasonic longitudinal wave receiver are symmetrically arranged in two side walls of the cubic test die; the ultrasonic transverse wave emitter and the ultrasonic transverse wave receiver are symmetrically arranged in the two side walls of the cubic test die; and the ultrasonic wave signal processing unit is connected with the ultrasonic longitudinal wave emitter, the ultrasonic longitudinal wave receiver, the ultrasonic transverse wave emitter and the ultrasonic transverse wave receiver respectively. The dynamic modulus of elasticity and the poisson ratios of the cement-based material in the early age can be measured nondestructively.

Polymer formulations including urethane acrylates, adhesion promoters, and conductive monomers. By selecting suitable conductive monomers, it is possible to achieve formulations having a volume resistivity from 10⁶ to 10¹⁰ Ohm·cm after being conditioned for one week at 25° C. and 50% relative humidity. Such formulations are suitable for incorporation into electro-optic materials, such as electro-optic displays or variable transmission films, e.g., for architectural applications. In other embodiments, the formulations additionally include metal oxide nanoparticles to alter the refractive index and/or conductivity. The addition of certain metal nanoparticles additionally facilitates non-destructive measurement of layer thickness using X-ray fluorescence spectroscopy.

The method includes steps: using imaging device of biomedicine obtains layered sequence images in situ of root system of plant grown at different opaque medium. Processing and analyzing the sequence images obtains spatial geometrical characteristic parameters in situ of root system of plant. Based on the said parameters, model of solid geometry is built. 3D visualized reconstruction is carried out for model of solid geometry so as to build 3D display model of root system. Features are: obtaining images in situ of root system of plant precisely and in non-destructive, sampling procedure is simplified so as to save labor to separate soil, greatly raised accuracy.

A nondestructive measuring-method of surface temperature and pressure of cylindrical pressure container includes setting up relation model of Rayleigh wave transition time to pressure container surface temperature and pressure; utilizing measurement unit formed by four Rayleigh wave probe, ultrasonic transceiver circuit, circulation control circuit, time/digit conversion circuit and monolithic computer for calculating out surface pressure and temperature value of pressure container by measuring transition time of Rayleigh wave in transmission distance.