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Method and apparatus for correcting subsidence amount of sickbed
ActiveCN106924886AHigh precisionImprove correction accuracyPatient positioning for diagnosticsX-ray/gamma-ray/particle-irradiation therapyTreatment fieldComputer science
The present invention belongs to the radiotherapy field and discloses a method or apparatus for correcting the subsidence amount of a sickbed. The method comprises the following steps that: the image of a patient is obtained; the distribution function of the subsidence amount of the sickbed is searched according to the weight of the patient and the movement distance of the sickbed, a subsidence amount corresponding to the image is obtained, and the distribution function of the subsidence amount of the sickbed is the distribution of the relative subsidence amount of the sickbed with respect to the weight of the load and the movement distance of the sickbed; and the subsidence amount is utilized to correct the image or the arrangement error of the patient. With the method or apparatus for correcting the subsidence amount of the sickbed of the invention adopted, the relative subsidence amount of a radiotherapy device and an imaging device can be corrected, the relative subsidence amounts of the sickbed at the imaging device side which are obtained under a condition that the sickbed moves different distances can be corrected, and correction accuracy is higher.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Sample preparation instrument
InactiveCN103175727AWide adaptabilityGood repeatabilityPreparing sample for investigationBiochemical engineeringNitrogen
The invention discloses a sample preparation instrument which comprises an outer shell; a nitrogen blow tank is formed in the top in the shell; the lower part of the nitrogen blow tank is provided with a nitrogen blow plate device; slide ways are respectively arranged at the two sides of the nitrogen blow plate device and in the middle of the nitrogen blow plate device; the nitrogen blow plate device is also provided with nitrogen blow plates capable of sliding along the slide ways; each slide way is provided with a blocking groove, and each nitrogen blow plate is fixed by the corresponding blocking groove; a first fixing groove used for placing a sample liquid receiving plate is formed in the bottom in the outer shell; the first fixing groove is sequentially provided with an intermediate sealing ring and a second fixing groove; the second fixing groove is provided with a sample preparation plate and a solid phase extraction (SPE) bracket; a lever, an oscillator and a negative pressure pump are arranged at the lower part of the first fixing groove; the side surface of the first fixing groove is provided with two small holes which are respectively connected with two fans, and a gas heating device located at the back of the first fixing groove; and the back of the outer shell is provided with a waste liquid outlet hole, an outer nitrogen interface, a negative pressure interface, a power interface and a nitrogen heating device.
Owner:安徽百奥秘科生物医药研究院有限公司
Self-contained biological indicator
ActiveCN107137741AAvoid breakingAvoid degradationApparatus sterilizationMicrobiological testing/measurementStress concentrationMechanical engineering
The invention provides a self-contained biological indicator. A biological sterilization indicator is disclosed that in some embodiments comprises a housing having a first enclosure and a second enclosure, an ampule containing a liquid growth medium, and an insert disposed at least partially in the first enclosure. A portion of the ampule may be disposed inside the first enclosure. The insert may have a platform including a top surface, an abutment surface, and a side surface, as well as a first void disposed in the platform and configured to allow passage of a first volume of the liquid growth medium into the second enclosure and a second void disposed through at least a portion of the side surface and configured to allow passage of a second volume of the liquid growth medium into the second enclosure. The second void of the insert may be an angled cut through the abutment surface and the side surface, which may be disposed entirely beneath the top surface. In some embodiments, stress concentrators and other features are included to reduce the force required to activate the biological sterilization indicator.
Owner:ETHICON INC
Brushless doubly-fed motor control system, feed forward control method and parameter identification method
ActiveCN108322117ALow costEliminate couplingElectronic commutation motor controlVector control systemsProportional controlCoupling
The invention discloses a brushless doubly-fed motor control system, a feed forward control method and a parameter identification method. The control system comprises a d-axis control structure for outputting a d-axis component of a voltage command value and a q-axis control structure for outputting a q-axis component of the voltage command value. The d-axis control structure comprises a first PIcontroller, a first proportional controller, a second proportional controller, a first differential controller, a first superimposer and a second superimposer. The first proportional controller, the second proportional controller and the first differential controller are used for generating a first d-axis intermediate component, a second d-axis intermediate component and a third d-axis intermediate component respectively. The first PI controller is used for outputting a d-axis component of a voltage initial reference value; and the second superimposer is used for carrying out superposition processing on the d-axis feed forward quantity of the voltage reference value and the d-axis component of the voltage initial reference value to output a voltage command value. The control system eliminates a coupling term between the current and voltage of a control winding, and realizes accurate closed-loop control.
Owner:HUAZHONG UNIV OF SCI & TECH
Method and system for verifying synchronous exposure of camera and electronic equipment
InactiveCN111669479AVerify synchronicityImprove accuracyTelevision system detailsColor television detailsRadiologyExposure
The invention discloses a method and a system for verifying synchronous exposure of a camera and electronic equipment. The method for verifying synchronous exposure of the cameras comprises the following steps of obtaining at least two groups of identification images obtained by simultaneously shooting a marker through at least two cameras, the marker being changed at an interval of a predetermined time, and the identification images of different frames in each group of identification images comprising different images of the marker, identifying the image of the marker contained in the identification image of the corresponding frame in the at least two groups of identification images to obtain a time difference between the identification images of the corresponding frame; and judging whether the time difference between the identification images of the corresponding frames is less than a time threshold, if so, judging that the at least two cameras are synchronously exposed, and if not,judging that the at least two cameras are not synchronously exposed.
Owner:SUNNY OPTICAL ZHEJIANG RES INST CO LTD
Mean valve with multiple air circuits
ActiveCN107289150AAvoid malfunctionsSolve the problem of deviation introduced by machining accuracyOperating means/releasing devices for valvesMultiple way valvesInlet channelAir spring
The invention discloses a mean valve with multiple air circuits. The mean valve comprises a valve body, a valve seat and a mean piston. A valve cavity is formed in the valve body, the mean piston is arranged in the valve cavity, and the mean piston comprises a piston rod and a plurality of piston bodies, wherein the piston rod is sleeved with the piston bodies, the piston bodies are fixedly arranged on the piston rod, and the areas, under the air pressure action, of the piston bodies are equal. The sides, close to the valve seat, of the piston bodies and the inner wall of the valve body form pressure cavities only communicated with an air pressure inlet channel, and the pressure cavity formed by the side, close to the valve seat, of each piston body and the inner wall of the valve body is connected with a mean pressure outlet. The mean valve is suitable for the mean of two- or more-channel air spring pressure, and it is avoided that when two- or more-channel air spring pressure is processed, a plurality of mean valves need to be connected in parallel or in series, and consequently errors are caused; the concentricity is better, the situations that the friction between the piston and the wall surface of the valve body is enlarged due to overlarge deviations of the concentricity, and the resistance is increased, so that valve action is out of order are avoided.
Owner:CRRC QINGDAO SIFANG ROLLING STOCK RES INST
Track inspection vehicle positioning method and positioning system based on visual identification
ActiveCN114802358AEliminate accumulated errorsHigh positioning accuracyInternal combustion piston enginesCharacter and pattern recognitionTrackwayEngineering
The invention discloses a track inspection vehicle positioning method and system based on visual identification, and the method comprises the steps: S1, taking a certain number of marking points on the side surface of a track, setting a label at each marking point, and recording the absolute positions of all labels; s2, a camera and an encoder are arranged on the track inspection vehicle, the camera can shoot the label, the encoder transmits a signal to the upper computer in real time to obtain an encoder record value, after transmission is completed, the encoder record value is reset, the encoder counts again, the track inspection vehicle stops at the label, and the distance between a camera coordinate system and the label is obtained; and S3, the relative mileage information of the encoder is calibrated by using the difference value between the absolute position of the label and the relative position of the encoder, errors are eliminated, the actual value of the track length is obtained, a large number of accumulated errors caused by snakelike motion of the track inspection vehicle are avoided, and the relative positioning precision is remarkably improved.
Owner:WUHAN UNIV
In-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon
InactiveCN105628674AEliminate pre-processingSolve the problem of migration into foodRaman scatteringPolycyclic aromatic hydrocarbonFood contact materials
The invention relates to an in-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon. The method comprises the following steps: performing mercaptan modification on silver nanoparticle surfaces and microextraction on polycyclic aromatic hydrocarbon in a food contact material, condensing the prepared silver nanoparticle solution modified with mercaptan on the surface to be 10-100 folds, then mixing the concentrated solution with the extract solution in situ according to a volume ratio of the concentrated solution to the extract solution being (1-2):(1-2), and adopting the Raman spectrometer to detect surface enhancement Raman spectroscopy signals of polycyclic aromatic hydrocarbon, so as to obtain the polycyclic aromatic hydrocarbon surface enhancement Raman spectroscopy signals. According to the invention, the extraction method and the surface enhancement Raman spectroscopy method are combined, the extracting solution is not required to be transferred into a detector, but the pollutant can be detected in situ, so that the sample pretreatment procedure can be avoided and the error introduced during the pretreatment process can be avoided; the determination method is simple, environment-friendly, rapid and capable of solving the problem that the food contact material is required to be screened rapidly on the site to prevent migration of polycyclic aromatic hydrocarbon into the food.
Owner:SHANDONG UNIV
Control system, feed-forward control method and parameter identification method of brushless doubly-fed motor
ActiveCN108322117BLow costEliminate couplingElectronic commutation motor controlVector control systemsProportional controlElectric machine
Owner:HUAZHONG UNIV OF SCI & TECH
RF system group delay parameter measuring method
InactiveCN103516451ASimple structureAvoid introducing errorsRelay systems monitoringTime delaysCarrier signal
The invention discloses an RF system group delay parameter measuring method which comprises the steps as follows: the moving contact of a single-pole double-throw switch is combined with a first fixed terminal; a first pulse signal is sent to a first analog-digital converter through a pulse signal generator, and a second pulse signal is sent to a modulator through the pulse signal generator; a first carrier signal is sent to the modulator through a first RF source; the second pulse signal is modulated into the first carrier signal through the modulator; a signal with a new time delay is demodulated through a square law detector; a first synchronous sampling clock signal is sent to a power divider through a second RF source, and the first synchronous sampling clock signal from the second RF source is divided into two paths through the power divider. The measuring method utilizes the square law detector to demodulate a modulated signal, so as to avoid the introducing errors and improve the measuring accuracy which is better than 1 ns. The applicable frequency range of the measuring method is 100 MHz-50 GHz.
Owner:BEIJING INST OF RADIO METROLOGY & MEASUREMENT
Crack near-field deformation analysis area determination method based on level set method
The invention discloses a crack near-field deformation analysis area determination method based on a level set method. The method comprises the following steps of 1) setting a crack near-field initial analysis area; 2) obtaining a coordinate position of a crack propagation track; 3) calculating a level set function of the crack propagation track; 4) updating an analysis area; (5) repeating the steps (2)-(4), and continuously updating the analysis area according to the expansion information of the crack so as to complete the crack near-field analysis area adaption. According to the method, the crack near-field deformation analysis area of the element and the structural member can be rapidly determined under the crack propagation condition, the manual determination of the crack near-field analysis area can be avoided, the introduction of errors by testers in the implementation process is effectively avoided, and the accuracy and the reliability of the crack near-field deformation analysis area are improved; secondly, the analysis efficiency is high, and the updating of a crack near-field analysis area can be rapidly completed; and finally, the labor cost can be reduced, the automation of the crack near-field deformation analysis area is realized, and the damage tolerance test technology is improved.
Owner:CHINA AIRPLANT STRENGTH RES INST
Ethanol content detection device
InactiveCN101493421AReduce volumeEasy to carryMaterial analysis by observing effect on chemical indicatorAlcohol contentLiquid-crystal display
The invention discloses an ethanol content detection device. A shell (9) of the ethanol content detection device is provided with an LCD (10), a circuit board (8) is arranged inside the ethanol content detection device, a calibration pad (4) and a test paper strip slot (1) are arranged below the ethanol content detection device, a test paper strip clamp (2) with a groove is arranged inside the test paper strip slot (1), a test paper strip (3) is arranged inside the groove, a light limiting tube (5) is arranged on the test strip (3), a photocell (7) is arranged on the light limiting tube (5), two sides of the photocell (7) are arranged with LEDs (6), the circuit board (8) is arranged on the photocell (7), and the LEDs (6) is welded with the circuit board (8). Light from the LEDs shoots on the test paper strip and is reflected to the photocell by the light limiting tube, passes through a signal adjustment circuit, and is acquired, computed, displayed and stored by an A / D converter in a single-chip microcomputer, which can quickly and exactly obtain alcohol content detection for a human body and effectively prevent a detection result from being affected by human factors.
Owner:SHANXI YASEN INDAL
Brushless doubly-fed motor integrated parameter identification method based on steady-state electric quantity amplitude sampling
ActiveCN114157205AVersatileAvoid introducing errorsElectronic commutation motor controlGenerator control circuitsLoop controlMathematical model
The invention belongs to the technical field of motor control, and provides a brushless doubly-fed motor integrated parameter identification method based on steady-state electric quantity amplitude sampling, the method is realized based on a general reduced order dq mathematical model of a brushless doubly-fed motor, simple open-loop control under a no-load and pure resistive load working condition is only needed, and the identification accuracy of the brushless doubly-fed motor integrated parameter is greatly improved. The method is suitable for different occasions of independent operation, grid-connected operation and the like, is suitable for brushless doubly-fed motors with different structural design processes, and has good universality; all parameters rc, Lpe, Lce and Me in the reduced-order model are directly identified based on simple calculation, processing such as approximate conversion is avoided, errors introduced in the intermediate identification and complex calculation process can be avoided, and good accuracy is achieved; and meanwhile, only voltage and current amplitude and frequency data are needed, dq component data are not needed, so that the rotor position angle information is not required to be acquired, and the method can be universally used in application occasions with coded discs and without coded discs.
Owner:CHONGQING UNIV
Magnetic ball calibration method and magnetic ball calibration device
PendingCN114468945AEasy CalibrationQuick calibrationSurgeryEndoscopesMagnetic polesCondensed matter physics
The invention discloses a magnetic ball calibration method and a magnetic ball calibration device. The magnetic ball calibration method comprises the steps that a magnetic ball rotates around a first shaft by a first angle, detection data in the rotating process are obtained, and the zero point position P0 of the magnetic ball with the magnetic field intensity component being zero in the direction of a second shaft is obtained according to the detection data; obtaining a calibration position of the magnetic ball according to the detection data and the zero point position P0; calibrating the magnetic ball according to the calibration position of the magnetic ball; when the magnetic ball is located at the calibration position, the magnetic polarization direction of the magnetic ball coincides with the second axis; the first shaft is perpendicular to the second shaft; the three-axis magnetic field component comprises an X-axis magnetic field component, a Y-axis magnetic field component and a Z-axis magnetic field component; the direction of the Z-axis magnetic field component coincides with the direction of the second axis; the Y-axis magnetic field component coincides with the direction of the first axis. According to the magnetic ball calibration method and the magnetic ball calibration device, the magnetic ball can be calibrated conveniently, quickly and accurately.
Owner:ANKON MEDICAL TECH (SHANGHAI) CO LTD
Pound-drever-hall laser frequency stabilization system without phase shifter
InactiveCN103579896BOvercoming hardware errorsReduce the number of hardwareLaser detailsFrequency stabilizationPhotodetector
Pound-Drever-Hall laser frequency stabilization system without phase shifter, including laser source, MCU controller, DDS RF signal source, electro-optic modulator, reference cavity, photodetector, frequency selective amplifier network, mixer, low-pass filter device, A / D, D / A converter, DSP processor, switch module and PZT drive circuit. The system has two working modes, the working mode is selected by the DSP processor, and one of the RF reference signals output by the DDS RF signal source is switched by the switch module or the frequency drift signal output by the conditioned photodetector enters the mixer; DDS The radio frequency signal source generates two orthogonal radio frequency reference signals, which are mixed with the signal selected by the switch module respectively. After acquisition, phase sensitive detection and control strategy calculation are performed in the DSP processor to achieve the effect of frequency stabilization. The invention improves the frequency stabilization accuracy and realizes laser automatic tracking and locking.
Owner:XIAN UNIV OF TECH
Image processing method and device
ActiveCN113676715AImprove the effect of white balance processingAvoid color castColor signal processing circuitsPattern recognitionImaging processing
The embodiment of the invention provides an image processing method and device, and the method comprises the steps: obtaining a to-be-processed image which comprises a face image; acquiring a color value and a conversion coefficient of the face image in the first coordinate system; converting the color value of the face image through the conversion coefficient to obtain a reference color value, wherein the reference color value is used for indicating the color value of ambient light corresponding to the face image in the first coordinate system. According to the image information of the to-be-processed image and the reference color value, a target color value is determined, white balance processing is carried out on the to-be-processed image through the target color value, and the target color value is used for indicating the color value of ambient light corresponding to the to-be-processed image in the first coordinate system. The reference color value is determined through the conversion coefficient of the linear relationship between the reference color value and the color value of the face image, and the linear relationship is a primary linear relationship, so the white balance processing effect of the portrait can be effectively improved.
Owner:SPREADTRUM SEMICON (NANJING) CO LTD
A multi-gas path averaging valve
ActiveCN107289150BAvoid introducing errorsGuaranteed uptimeOperating means/releasing devices for valvesMultiple way valvesInlet channelAir spring
The invention discloses a mean valve with multiple air circuits. The mean valve comprises a valve body, a valve seat and a mean piston. A valve cavity is formed in the valve body, the mean piston is arranged in the valve cavity, and the mean piston comprises a piston rod and a plurality of piston bodies, wherein the piston rod is sleeved with the piston bodies, the piston bodies are fixedly arranged on the piston rod, and the areas, under the air pressure action, of the piston bodies are equal. The sides, close to the valve seat, of the piston bodies and the inner wall of the valve body form pressure cavities only communicated with an air pressure inlet channel, and the pressure cavity formed by the side, close to the valve seat, of each piston body and the inner wall of the valve body is connected with a mean pressure outlet. The mean valve is suitable for the mean of two- or more-channel air spring pressure, and it is avoided that when two- or more-channel air spring pressure is processed, a plurality of mean valves need to be connected in parallel or in series, and consequently errors are caused; the concentricity is better, the situations that the friction between the piston and the wall surface of the valve body is enlarged due to overlarge deviations of the concentricity, and the resistance is increased, so that valve action is out of order are avoided.
Owner:CRRC QINGDAO SIFANG ROLLING STOCK RES INST
Electric energy metering device verification equipment start-stop parameter early warning method and system
ActiveCN113126018AEasy to adjustAvoid introducing errorsElectrical measurementsAlarm stateControl system
According to the electric energy metering device verification equipment start-stop parameter early warning method and system provided by the invention, the real-time start-stop parameter of the verification equipment is obtained when the verification equipment is switched in the operation state, and whether the verification equipment is in the alarm state is determined according to the real-time start-stop parameter of the verification equipment, when the verification equipment is in an alarm state, an alarm signal can be sent out, the parameter condition of the verification equipment when the verification equipment is input or cut out is fed back to an operator or a control system in time, and the information that the starting and stopping parameters of the verification equipment are abnormal is provided for the operator or the control system of the verification equipment in time, an operator or a control system can conveniently make adjustment in time, it can be avoided that errors are possibly introduced to the verification result of the electric energy metering device when verification equipment is input or cut out in the state that the verification equipment does not meet the conditions, and the verification accuracy is improved.
Owner:MEASUREMENT CENT OF GUANGDONG POWER GRID CO LTD
A non-contact induced current detection system and method based on lock-in amplification
ActiveCN111443231BEasy to record test dataEasy to recordCurrent/voltage measurementConvertersRidge waveguides
The invention belongs to the technical field of induction current detection, and specifically relates to a non-contact induction current detection system and method based on phase-locked amplification, including a control circuit, a wave-to-wave converter, a double-ridge waveguide, a power module, and a first radio frequency signal source , a lock-in amplifier, a second radio frequency signal source, two ends of the double ridge waveguide are respectively connected with a wave-to-wave converter, and the double-ridge waveguide is respectively connected to a control circuit, a power module, a first radio frequency signal source, A lock-in amplifier, the lock-in amplifier is connected with a second radio frequency signal source, a sensitive unit bridge wire and a tunnel magneto-resistance probe are arranged in the double ridge waveguide, and the sensitive unit bridge wire is connected with the tunnel magneto-resistance probe. The invention can effectively avoid the error introduced by the test equipment, and can extract the effective output voltage value of the tunnel reluctance probe in the interference environment through the phase locking method, thereby indirectly obtaining the magnitude of the induced current on the bridge wire of the sensitive unit. The invention is used for the detection of induced current.
Owner:ZHONGBEI UNIV
Focusing method, focusing device and readable storage medium of ultra-short-throw projector
ActiveCN110769226BReduce computational complexityAvoiding the problem of introducing errors from clarity dataPicture reproducers using projection devicesComputation complexityImaging processing
The invention relates to the technical fields of image processing and projection focusing, and specifically discloses a focusing method, a focusing device and a readable storage medium for an ultra-short-focus projector. The present application projects the projection image to the projection surface; drives the focus motor to rotate a stroke in a stepwise manner, and obtains the first projection screen image and the second projection screen image at each step position of the focus motor; obtains the corresponding image of the first image acquisition device The position of the first focus motor, and the position of the second focus motor corresponding to the second image acquisition device; determine the focus position according to the position of the first focus motor and the position of the second focus motor; drive the focus motor to reach The focus position, the method to complete the focus. By analyzing the sharpness of the images of the projected screen areas on both sides to determine the optimal focus position on both sides, and then comprehensively determine the final focus position, the computational complexity is greatly reduced, and at the same time, the introduction of sharpness data in the original image due to the error of the splicing method can be avoided. error problem.
Owner:CHENGDU XGIMI TECH CO LTD
Large-scale road maintenance machine man-machine interaction method and device based on database operation
PendingCN114779991AImprove versatilityShorten development timeDatabase management systemsSoftware engineeringEngineeringData content
The embodiment of the invention provides a large road maintenance machine man-machine interaction method based on database operation. The method comprises the steps of obtaining a user demand; dividing a display interface into a menu area and a content area according to the user demand, and displaying the menu area and the content area on the display interface; associating data contents configured in a data table of a database with menu options in the menu area and data contents displayed in the content area, and respectively displaying the associated menu options and data contents in the menu area and the content area of the display interface; a menu selection instruction is obtained, the menu selection instruction comprises menu options selected by a user, and data content associated with the menu options selected by the user is displayed in a content area according to the menu selection instruction. The universality of the upper computer interface is improved, the development time is saved, and a large number of errors caused by manual variable association are effectively avoided.
Owner:CRCC HIGH TECH EQUIP CORP LTD
A Ratio Method for Correcting Terrain Influence in Electromagnetic Exploration
ActiveCN103064124BHold responseAvoid introducing errorsElectric/magnetic detectionAcoustic wave reradiationTopographic profileEngineering
The invention discloses a ratio method for correcting topographic influence in electromagnetic prospecting. The ratio method comprises the steps of acquiring a surface layer resistivity value without topographic influence to serve as a standard resistivity of topographic correction; drawing an in-line topographic profile, respectively comparing the topographic profile with a frequency point profile of a frequency domain electromagnetic method and a time channel profile of a time domain electromagnetic method, and judging the topographic influence suffered by the actually measured data according to the influence rule of the topography on the resistivity in the frequency domain and the time domain electromagnetic field; observing from the highest frequency point of the frequency domain electromagnetic method and the earliest time channel of the time domain electromagnetic method so as to obtain the topographic response which is closest to the surface layer until the absence of low-frequency frequency point of the topographic influence is observed in the frequency domain electromagnetic method and the absence of the late time channel of the topographic influence is observed in the time domain electromagnetic method, and acquiring the observation data without topographic influence; and performing topographic correction according to a ratio formula of pcorrected(i,j)=pmeasured(i,j) [pstandard(i) / pmeasured(i,l)]C(i,j). The ratio method is good in correction effect in the process of correcting the topographic influence, is high in feasibility and can be widely applied to topographic influence correction in electromagnetic prospecting.
Owner:JIANGSU UNIV
A sample preparation instrument
InactiveCN103175727BWide adaptabilityGood repeatabilityPreparing sample for investigationBiochemical engineeringNitrogen
Owner:安徽百奥秘科生物医药研究院有限公司
A Measuring Method of Numerical Aperture of Optical Lens Based on Computational Imaging
ActiveCN109443705BEasy to operateHigh measurement accuracyTesting optical propertiesCamera lensDigital signal processing
The invention discloses a computational imaging-based optical lens numerical aperture measurement method. The method includes the following steps that: a microscopic optical path system for numericalaperture measurement is constructed; the relative positions of a photographed object and a camera in the microscopic optical path system are adjusted, so that a microscopic image with a high dynamic range is obtained; a system magnification factor is calculated on the basis of to the size of the pixels of the camera and according to the size of the photographed object in the image; digital image processing is performed on the obtained image, so that a frequency diagram with a circular contour is obtained, and image processing is performed, so that the diameter of the circle is calculated; andthe numerical aperture of the lens is calculated according to the diameter of the circle and on the basis of the size of the pixels of a light sensing component, the system magnification factor, and an illumination light center wavelength. With the method of the invention adopted, the numerical aperture of any lens in life can be measured. The method has the advantages of simple operation processand high measurement precision. According to the method, the numerical aperture is obtained through calculation, human observation is rarely required, and the introduction of additional error can be effectively avoided.
Owner:NANJING UNIV
Focusing method and focusing device of ultra-short-focus projector and readable storage medium
ActiveCN110769226AReduce computational complexityAvoiding the problem of introducing errors from clarity dataPicture reproducers using projection devicesImaging processingComputation complexity
The invention relates to the technical field of image processing and projection focusing, and particularly discloses a focusing method and a focusing device of an ultra-short-focus projector and a readable storage medium. The method comprises steps of projecting projection image to the projection surface; driving the focusing motor to rotate for one stroke in a stepping mode, and obtaining a firstprojection picture image and a second projection picture image at each step position of the focusing motor; acquiring a first focusing motor position corresponding to the first image acquisition device and a second focusing motor position corresponding to the second image acquisition device; determining a focusing position according to the first focusing motor position and the second focusing motor position; and driving a focusing motor to reach a focusing position to finish the focusing method. The optimal focusing positions on the two sides are determined by conducting definition analysis on the projection picture area images on the two sides respectively, then the final focusing position is comprehensively determined, the calculation complexity is greatly reduced, and meanwhile the problem that errors are introduced into definition data in an original image due to errors of a splicing method can be avoided.
Owner:CHENGDU XGIMI TECH CO LTD
Focusing method and focusing device of ultra-short-focus projector and readable storage medium
InactiveCN110769227AReduce computational complexityAvoid introducing errorsTelevision system detailsGeometric image transformationPhysicsProjection image
The invention relates to the technical field of image processing and projection focusing, in particular to a focusing method and a focusing device of an ultra-short-focus projector and a readable storage medium. The focusing method comprises the following steps: positioning projection picture area positions in projection picture images acquired by two image acquisition devices; projecting a projection image to the projection surface, driving the focusing motor to rotate and enabling the two image acquisition devices to shoot projection pictures respectively; respectively converting the acquired projection picture images into projection picture area images, screening a focusing motor position with optimal comprehensive definition data as a focusing position according to the definition dataof the two projection picture area images, and driving a focusing motor to reach the focusing position to complete focusing. By splicing the data of the two projection picture area images and then carrying out definition analysis, the effect similar to an image splicing mode is achieved, the calculation complexity is greatly reduced, and meanwhile the problem that errors are introduced into definition data in an original image due to errors of the splicing method can be avoided.
Owner:CHENGDU XGIMI TECH CO LTD
Method and device for correcting the subsidence of hospital bed
ActiveCN106924886BHigh precisionImprove correction accuracyPatient positioning for diagnosticsX-ray/gamma-ray/particle-irradiation therapySick personRadiotherapy unit
The present invention belongs to the radiotherapy field and discloses a method or apparatus for correcting the subsidence amount of a sickbed. The method comprises the following steps that: the image of a patient is obtained; the distribution function of the subsidence amount of the sickbed is searched according to the weight of the patient and the movement distance of the sickbed, a subsidence amount corresponding to the image is obtained, and the distribution function of the subsidence amount of the sickbed is the distribution of the relative subsidence amount of the sickbed with respect to the weight of the load and the movement distance of the sickbed; and the subsidence amount is utilized to correct the image or the arrangement error of the patient. With the method or apparatus for correcting the subsidence amount of the sickbed of the invention adopted, the relative subsidence amount of a radiotherapy device and an imaging device can be corrected, the relative subsidence amounts of the sickbed at the imaging device side which are obtained under a condition that the sickbed moves different distances can be corrected, and correction accuracy is higher.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Sampling hold circuit structure for realizing offset elimination function
PendingCN113098510AEliminate Offset Voltage ErrorReduce difficultyPhysical parameters compensation/preventionCMOSTransmission gate
The invention relates to a sampling hold circuit structure for realizing a detuning elimination function, which comprises an operational amplifier, a first CMOS (Complementary Metal Oxide Semiconductor) transmission gate module and a detuning elimination module, the positive input end of the operational amplifier is connected with an input signal, and the output end of the operational amplifier is connected with the first CMOS transmission gate module; the negative input end of the operational amplifier is connected with the output end of the operational amplifier to serve as a unit gain buffer, the two ends of the offset elimination module are connected with the positive input end of the operational amplifier and the output end of the CMOS transmission gate module respectively, and the offset elimination module is used for eliminating the influence of offset voltage introduced by the operational amplifier. By adopting the sampling hold circuit structure for realizing the offset elimination function, the offset voltage error of the operational amplifier is eliminated, the design difficulty of the operational amplifier is reduced, and meanwhile, the cost is reduced. The large-size MP1 and MN1 and the minimum-size MP2 and MN2 are adopted, the high sampling speed is met, and meanwhile the precision of the whole analog-to-digital converter is guaranteed.
Owner:CRM ICBG (WUXI) CO LTD
Stand-alone set of biological indicators
ActiveCN107137741BAvoid breakingAvoid degradationApparatus sterilizationMicrobiological testing/measurementBiotechnologyCell culture media
Owner:ASP GLOBAL MFG GMBH
Phase difference measurement device and measurement method for waveguide array
PendingCN109556833ACompact structureAccurate phase difference measurementOptical apparatus testingMeasurement devicePhase difference
The invention provides a phase difference measurement device for a waveguide array. The device comprises a monitoring waveguide, an off-chip coupler and a detector, wherein the monitoring waveguide isdisposed between adjacent array waveguides; a coupled light beam is formed between the monitoring waveguide and the array waveguides through an evanescent wave; the coupled light beam is transmittedto the detector through the off-chip coupler; and the detector converts the coupled light beam and outputs a current signal. The power extraction and beam combination are realized through a single waveguide; the interference power is measured by the detector; the structure is compact; and the device is conveniently disposed at the output end of a phased array chip or near an antenna to achieve accurate phase difference measurement.
Owner:CHINA SCI PHOTON CHIP HAINING TECH CO LTD
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