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374results about How to "The test result is accurate" patented technology

Fiberboard quality classification method based on machine vision

The invention relates to the field of artificial intelligence, in particular to a fiberboard quality classification method based on machine vision. The method includes: acquiring a fiberboard surface grayscale image; performing sliding window processing on the grey-scale map on the surface of the fiberboard to obtain a plurality of sliding window areas; calculating the smoothness of a central pixel point of the sliding window; taking the pixel point corresponding to the minimum smoothness as a target pixel point, and obtaining a plurality of target connected domains; obtaining gradient amplitudes of pixel points in each target connected domain to construct a corresponding gradient histogram, calculating the probability that each target connected domain is a defect area, and determining all defect areas; calculating the probability of each gray value as a standard gray value, and determining the standard gray value; and calculating the quality coefficient of the fiberboard according to the gray average value of each defect area, and classifying the quality of the fiberboard. By analyzing the glossiness of the surface image of the fiberboard, the defect that the spatial domain feature is not obvious can be detected, so that the detection result is more accurate, and the product classification accuracy and the repair timeliness are improved; and the production efficiency is effectively improved.
Owner:泗阳富艺木业股份有限公司

Non-contact tension detection and feedback control mesh belt winding device

InactiveCN101603244AThe test result is accurateFaster and more effective tension adjustmentAuxillary apparatusMechanical energy handlingImage sensorImage acquisition
The invention relates to textile equipment, particularly relates to a non-contact tension detection and feedback control mesh belt winding device, comprising a winding roller which drives the mesh belt to convolute to weave and is driven by an AC asynchronous motor; a charge couple device image sensor is arranged outside the mesh belt between two guide rollers, an ultrasonic wave sensor is arranged on the periphery of a ball of mesh belts, the charge couple device image sensor is connected with an image acquisition card, the ultrasonic wave sensor is connected with a signal acquisition card and the image acquisition card, the signal acquisition card is connected with a PC industrial personal computer connected with a motion control card, and the motion control card is connected with the AC asynchronous motor by a frequency converter; and a tension regulating device is arranged adjacently to the winding roller. The invention carries out non-contact detection on the variation of the tension force and the winding radius of the mesh belt and can not influence the tension force of the mesh belt due to the contact of the mesh belt, and the detection result is more accurate; and the tension force of the mesh belt is regulated by combining the operation of regulating the speed of the motor with the operation of driving a regulating roller by an air cylinder, thus the regulation of the tension force is faster and more effective.
Owner:珠海蓝坊智能设备有限公司

Nondestructive testing method for optical glass polishing sub-surface damages

InactiveCN103115927AThe test result is accurateFast detection processMaterial analysis by optical meansInverse operationPhysical model
The invention discloses a non-destructive testing method for optical glass polishing sub-surface damages. The method comprises the following steps of: preparing a non-destructive base at first, and then determining an incident angle for ellipsometry detection; calculating the optical constant of the non-destructive base according to ellipsometry parameters measured with the incident angle for ellipsometry detection, wherein the non-destructive base is defined as a substrate-environment structure, and a standard dielectric function is taken as a material physical model; defining a sub-surface damage surface of a sample as a multi-film optical model which comprises air, a coarse surface layer, a resedimentation layer and a substrate; building a multi-film material physical model through a mixed material effective medium model based on the multi-film optical model, and measuring the surface roughness and the depth distribution rule of surface sedimentation substances of the sample by virtue of the optical constant of the non-destructive base; and finally, carrying out inverse operation by a regression algorithm according to the ellipsometry parameters of the sample measured with the incident angle for ellipsometry detection, thus obtaining the depth of the sub-surface damage layer. The testing method is accurate, reliable, quick, efficient, flexible and controllable.
Owner:NAT UNIV OF DEFENSE TECH

Rapid measuring method for physical property of flavouring essences for tobacco

The invention discloses a method for quickly determining physical properties of flavoring essences for tobacco by the near infrared spectrum technology, which comprises the following technological steps in order: sample collection, namely more than 30 samples of the flavoring essences for tobacco are collected; content determination, namely the index contents of the collected samples is determined according to the method stated by the tobacco industry; spectrum scanning, namely near infrared transmitted spectrograms of the samples are collected by a transmitting and sampling module of a near infrared spectrometer; model formation, namely the near infrared spectrograms of the flavoring essences for tobacco are associated with corresponding indexes after pre-processing, the optimum spectral region range and the maximum principal divisor number are selected, and a mathematical model between the near infrared spectrums of the samples and the relative index contents is established and stored into a memory; and inspection of the flavoring essences for tobacco, namely the flavoring essences for tobacco of the same trademark undergo random sampling inspection, the near infrared transmitted spectrograms of the samples are acquired and compared with the mathematical model in the memory, and the physical indexes of the samples undergoing sampling inspection can be obtained. The method has the advantages of accurate testing result, simple and convenient operation, time and labor conservation, good repeatability of the testing result, high sensitivity and so on, and is suitable to be applied in the tobacco industry.
Owner:LONGYAN CIGARETTE FACTORY

Method for monitoring ferromagnetic material fatigue crack expansion by variated magnetic signal

The invention provides a method for monitoring the expansion of fatigue crack in magnetic material by taking use of unusually changed magnetic signals, which pertains to the technical field of non-destructive detection. The method comprises the following procedures: a standard specimen is made with central crack of same material and heat treatment state as an object to be tested; after cycling preset times in fatigue testing, the central crack area of the standard specimen is scanned by a magnetic sensor with fixed liftoff, the normal component Hp(y) signal of the surface stray magnetic field of the scanned area is obtained; the length of the central crack 2a is measured; the max. value Delta Hp(y)max of the self unusually-changed magnetic signal generated by the fatigue crack is extracted as the detection threshold for the cycle numbers; the Delta Hp(y)max and 2a are linearly fit to get the Delta Hp(y)max-2a relationship formula; the object to be tested is inspected by the same liftoff with above magnetic sensor, the measured Delta Hp(y)smax is compared with the detection threshold; the expansion process of the fatigue crack is obtained according to Delta Hp(y)max-2a linear relationship. The invention is easy to operate, with accurate detection results, can monitor the expansion of crack dynamically under an unloaded state.
Owner:ACADEMY OF ARMORED FORCES ENG PLA

Gauge and method for measuring size of transformation position of minor-diameter deep hole

The invention discloses a gauge for measuring the size of a transformation position of a minor-diameter deep hole. The gauge comprises a casing and a measuring rod. A sidewall and an upper end face of the measuring rod are respectively provided with a guide head and a conical head, the casing is provided with a measuring passage, and the measuring rod and the conical head can move along the measuring passage. The distance from a lower end face of the guide head to a lower end face of the conical head is identical to the length of the measuring passage. A lower end of the casing is a conical face which is matched with a first conical guide section of the minor-diameter deep hole in shape, and the conical head is matched with a second conical guide section of the minor-diameter deep hole in shape. The bottom of the conical face, the top of the conical head and the transformation position of the minor-diameter deep hole are of a same diameter. A guiding slot is arranged on an upper end face of the casing, and the depth of the guide slot is larger or equal to a qualified inserting depth of the measuring rod. The guide head can move along the guide slot when rotating to the guide slot. The invention further discloses a method for the above gauge. By the aid of the gauge and the method, the size of the transformation position of the minor-diameter deep hole can be measured conveniently, quickly and accurately.
Owner:NUCLEAR POWER INSTITUTE OF CHINA

Remote sensing image aircraft target detection method based on bounding box correction algorithm

The invention provides a remote sensing image airplane target detection method based on a bounding box correction algorithm, and solves the problems that a traditional non-maximum suppression algorithm directly selects a bounding box with the highest score, and the detection bounding box is inaccurate, and a segmented airplane is marked by multiple boxes during detection, so that false alarm is caused. The method comprises the following steps: generating a training and testing sample set; preprocessing a training sample; overlapping and slicing the test samples to obtain preprocessed test samples; training an aircraft target detection model; detecting an aircraft target in the slice; carrying out bounding box correction on a detection result in the test sample by using a bounding box correction method; and generating an airplane target detection result graph. According to the invention, overlapping correction is carried out on the intersecting boundary frames on the same target by using an overlapping correction method, so that a more accurate detection frame is obtained. Fusion improvement is performed on the parallel adjacent boundary frames on the same target by using an adjacent fusion method, and multi-frame false alarms on the same target are removed in a detection result. The method is used for remote sensing image airplane target detection.
Owner:XIDIAN UNIV

Test device and method for vertical initial motional impedance of bucket foundation

InactiveCN106284437AThe test result is accurateNot easy to rustFoundation testingInfluence factorSignal generator
The invention discloses a test device and method for the vertical initial motional impedance of a bucket foundation. The test device comprises the bucket foundation, a fan tower, a mass block, an extension thrust rod, a low-frequency electromagnetic exciter, an exciter fixing rack, a force sensor, a flange connecting disc, a soil pressure sensor, pore water pressure sensors, acceleration sensors, strain pieces, an energy-dissipation material, water drain pipes, a test iron box, steel angle ribs, steel plate reinforcing ribs, a loading frame, a power amplifier, a swept signal generator, a dynamic acquisition instrument and a computer. The test device is composed of a load loading part and a bucket foundation part, so that the vertical motional rigidity and the vertical motional impedance are measured. The low-frequency exciter is utilized for loading, and the motional rigidity of the bucket foundation is obtained by measuring the action force and displacement of a soil body. The motional impedance of the bucket foundation is obtained by applying vertical initial displacement to the mass block and measuring an attenuation curve. By adoption of the test device and method for the vertical initial motional impedance of the bucket foundation, the vertical initial motional impedance and influence factors of the bucket foundation can be accurately studied, and a basis is provided for further studying.
Owner:HOHAI UNIV

Heat induction defect detection method and system

Being applicable to the data processing field, the invention provides a heat induction defect detection method and system. The method includes: extracting the image of a to-be-detected apparatus from infrared images, and identifying the equipment type and heat induction defect type of the to-be-detected apparatus; according to the equipment type and the heat induction defect type, selecting a corresponding heat induction defect analysis method for the to-be-detected apparatus, and selecting a heating analysis area from a heating part in the to-be-detected apparatus, wherein the heating analysis area includes a frame selected area and a line segment area; according to the heating analysis area and the heat induction defect analysis method, analyzing whether a heat induction defect appears in the to-be-detected apparatus. According to the invention, the specific heating analysis area and heat induction defect analysis method are determined according to the equipment type and the corresponding heat induction defect type of the to-be-detected apparatus, different analysis for different apparatuses is fully achieved, so that the judgment about the existence of a heat induction defect in the apparatus can be more accurate and reliable, and the heat induction defect detection result of the apparatus can be more accurate.
Owner:SHENZHEN LAUNCH DIGITAL TECH +1

Image-sensor-based detection system of colloidal gold immunoassay

The invention discloses an image-sensor-based detection system of colloidal gold immunoassay and belongs to the field of the colloidal gold immunoassay. The detection system is as follows: a test strip placing platform for placing a test strip is arranged on a test strip detection platform; an illumination module and an imaging module are arranged above the test strip placing platform of the test strip detection platform; the illumination module consists of an illumination light source and a light homogenization unit arranged below the illumination light source; the illumination light source is a hollow annular light-emitting diode array light source formed by means that a plurality of light-emitting diodes are uniformly formed in an annular array; an image sensor of the imaging module uses a CMOS image sensor and the signal output end of the imaging module is electrically connected with the input end of a data collecting and processing device. The system adopts the annular matrix illumination and is provided with the light homogenization unit so that output light is homogenized and the detection result is accurate; the imaging module adopts the CMOS image sensor, so that the collection speed is high, and the requirement of dynamically tracking and observing the reaction process can be met.
Owner:SHANGHAI YAOYAN PHOTOELECTRIC SCI & TECH
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