30results about How to "Improve calibration reliability" patented technology

The invention relates to a camera calibration system and method thereof, which is capable of easily performing camera calibration using a concentric circle pattern. According to the invention, a method of calibrating a camera calibrates the intrinsic parameters of the camera required to measure geometric information of an object using projection invariable characteristics of concentric circles. The method includes the steps of: taking images of the calibration pattern consisting of two or more concentric circles located in the same plane and having different radius at different angles to obtain projected images; calculating the central point of the projected images using a given algorithm, and calculating the principal point and focal point of camera using a nonlinear minimization algorithm based on the central point thus obtained.

A calibration procedure for a real-time load-pull system whereby the signal passes through at least one of the tuners of said real-time load-pull system. A calibration standard is connected to the test ports and an electromagnetic wave signal passes through one of the tuners before passing through the wave sensing structure. After having passed the wave sensing structure the electromagnetic wave signal interacts with the calibration element. This results in a reflected and eventually a transmitted electromagnetic wave signal that pass through the wave sensing structures of the system. The sensed electromagnetic wave signals are measured by means of a receiver. The procedure is repeated with different calibration standards. Then a line element is connected to the test ports and, one after the other, a set of calibration standards, a power meter and a harmonic phase reference generator are connected to the output tuner, each time sending a signal and measuring the wave signals. The measured data is used to calculate the error coefficients of the real-time load-pull system.

The present invention concerns a mono-block stopper adapted to deliver gas during pouring of molten metal comprising a stopper body having an internal chamber (1) and a gas discharge port (2), a bore (3) connecting the internal chamber (1) to the gas discharge port (2), calibrating means (4) being provided in the bore (3) to provide a restricted path. This stopper is characterised by the fact that the calibrating means comprise a rod (4) having at least one axially-extending gas passages therealong, the gas passage(s) having a section such as to offer a predetermined resistance to flow. The stopper of the invention is far more reliable and can be easily adapted to various operational parameters.

The invention provides a method for calibrating a pre-tightening force of an external thread fastener with a sensor. The method comprises the following steps: carrying out temperature correction on each ultrasonic flight time delta tnact' by using a reference temperature; establishing a function fitting relation between an acoustic time difference delta tnkorr'-delta t0korr after temperature correction and different loads Fn and acquiring a fitting equation of a pre-tightening force F relative to the acoustic time difference after temperature correction. Therefore, a measurement result with high reliability can be obtained during measurement.

The invention belongs to the technical field of network switching, and particularly relates to a mimicry thought-based security switching chip, an implementation method of the security switching chipand network switching equipment, and the method comprises the following steps: carrying out scheduling processing on message data of each port according to input scheduling; aiming at each piece of message data, extracting a message header and caching the message data; parsing through a heterogeneous parsing algorithm, and carrying out mimicry judgment on a parsing result; generating a message descriptor according to the judgment result, wherein the message descriptor at least comprises message feature information related to the message forwarding strategy behavior; searching for a mimicry table item verification-based table item cache to obtain forwarding strategy behavior data and updating a message descriptor; and extracting corresponding message data from the cached message data, and sending the extracted message data to a corresponding port in the form of a data packet. The security and reliability of the switch chip are enhanced by introducing such technologies as de-collaborative caching, mimic forwarding engines and mimic table item checking, and the method has important guiding significance for the development of the network switching technology.

A method of locating a linear defect on a photographic element, the element having a useful imaging width and the defect aligned with length of the element, includes the steps of: exposing a region of the element to create a latent image which is substantially uniform across the useful imaging width of the element; developing the latent image to produce a density signal; sampling the density signal with a photometric device; and analyzing the sampled density data for the presence of significant deviations aligned with the length of the element to locate the defect.

A line of sight detection apparatus includes: a line of sight detection device which detects the line of sight of an occupant; an operation detection device which detects the operation of on-board equipment by the occupant; and a calibration device which calibrates a detection value of the line of sight detection device based on the operation of the on-board equipment by the occupant which is detected by the operation detection device and position data of the on-board equipment.

The invention relates to a laboratory recurrence-type digital electric energy metering equipment remote calibration system and method. The system comprises a laboratory host computer, a standard digital electric energy meter, a digital arbitrary waveform generator, an electric energy metering assembly, a digital oscilloscope, a merging unit and a clock synchronization device. The laboratory host computer, the standard digital electric energy meter and the digital arbitrary waveform generator are arranged in a calibration laboratory. The laboratory host computer, the standard digital electric energy meter, the digital arbitrary waveform generator, the electric energy metering assembly, the digital oscilloscope, the merging unit and tested digital electric energy metering equipment are connected in order. The clock synchronization device is connected with the digital oscilloscope, the merging unit and the tested digital electric energy metering equipment. The electric energy metering assembly is connected with the tested digital electric energy metering equipment and the laboratory host computer. Compared to the prior art, the invention achieves reliable remote calibration of electric energy metering errors, and improves the reliability of a digital metering system.

The invention provides a user data verification method and system. The timestamp of the client is used as a variable private key to encrypt the user data during encryption; the safety and the reliability of the first Sign data are improved; the problem that user data is tampered, the server side cannot be accurately verified; and economic loss of a user is caused can be solved. meanwhile, the server receives the first Sign data of the information, judges whether information corresponding to the first Sign data is processed or not according to the list; If processing has been performed, the information is directly abandoned, meanwhile, the time difference between the second timestamp and the first timestamp of the server is within a preset first time value range when the information is received; By means of the method, the problem that the server is attacked maliciously for multiple times within a period of time can be prevented, the data verification reliability is improved, the user data is safer, and unnecessary loss is avoided.

The invention relates to a system and device for verifying an electronic current transformer. The system is provided with a standard current transformer, a control processing part, a to-be-detected electronic current transformer, and a temperature adjustment device which is used for adjusting the temperature of a detection environment of the to-be-detected electronic current transformer. The control processing part enables the current signals, detected under different detection environment temperatures, of the electronic current transformer to be compared with a standard current signal, and carries out the corresponding processing of the comparison result, so as to achieve the verification of the electronic current transformer. The system can achieve the full-automatic verification of the detection precision during the batch production and verification of related electronic current transformers, and effectively improves the verification precision and efficiency. Moreover, the detection precision obtained through verification is closer to the actual detection precision, so the system is higher in verification reliability, and is higher in reliability of detection precision.

The invention provides a pressure sensor calibration device and calibration method, and belongs to the technical field of sensor calibration, and the device comprises a fixed support, a to-be-calibrated pressure sensor, a lifting assembly, a pulley assembly, a force application contact, and a calibration processor. A to-be-calibrated pressure sensor is installed on the fixing support. The liftingassembly is slidably connected with the fixing support. The pulley assembly comprises a fixed pulley block and a pulley rope; the lifting assembly and the weight seat are connected to two ends of thepulley rope; the force application contact is installed on the lifting assembly, moves upwards along with the lifting assembly and makes contact with the pressure sensor above the force application contact. The calibration processor collects output signals of the pressure sensor and calibrates the pressure sensor. According to the pressure sensor calibration device provided by the invention, the pressure sensor can be calibrated without using an additional sensor, so that the manufacturing cost is saved, and the use difficulty is reduced; the pulley assembly is used for enabling the lifting assembly to automatically ascend, errors caused by human intervention are reduced, and the accuracy of the calibration result is improved.

The invention provides an IQ data calibration method based on a constant envelope signal and an IQ data calibration device based on the constant envelope signal. The IQ data calibration method is used for communication equipment, and comprises steps that direct current offset calibration is carried out to acquire a direct current estimation value; at least n pairs of original IQ data are received, and IQ compensation parameters (a,b,c) are calculated according to a target function; calibration is carried out according to the direct current estimation value and the IQ data compensation parameters, and the IQ data (xc,yc) is calibrated. The IQ data calibration device used for executing the IQ data calibration method is provided. By adopting the IQ calibration method and the IQ calibration device provided by the invention, the calibration is carried out by requiring less data, and calibration speed is fast, and by determining whether an IQ compensation parameter extraction failure is caused by strong interference conditions or strong noise conditions, the data calibration reliability of the IQ calibration method and the data calibration reliability of the IQ calibration device are improved.

A calibration curve setting method used at the time of quantitatively analyzing specific components in a drug by a transmission Raman spectrum, the method comprising the steps of: obtaining respective transmission Raman spectra of a plurality of different wave number ranges including Raman hands corresponding to the specific components of a plurality of known drugs of which concentrations or amounts of the specific components are known and the concentrations or the amounts are different from each other; calculating candidate calibration curves which are candidates for calibration curves used for the quantitative analysis respectively from a plurality of transmission. Raman spectra in each of the wave number ranges; and using the most probable candidate calibration curve as a calibration curve for the quantitative analysis of the specific components, among the respective candidate calibration curves.

The invention discloses an industrial robot TCP calibration method, which comprises the steps of teaching, recording postures and calculating an attitude matrix and a displacement vector of a connecting rod tail end flange plate coordinate system of each posture; then firstly solving a least square solution Q of an over-determined equation set for TCP calibration, eliminating an error once, then solving a least square solution of TCP by using the least square solution Q, and further eliminating the error, thereby enabling the overall calculation to be more accurate, and improving the calibration reliability.

The invention relates to a transformer zero sequence differential protection self-checking system and a transformer zero sequence differential protection self-checking method. The transformer zero sequence differential protection self-checking system comprises a first current transformer module, a zero-sequence current transformer module, a second current transformer module, a signal conditioningmodule, a signal processing module, a power module and a display and input module, wherein secondary current signal output ends of the first current transformer module, the zero-sequence current transformer module and the second current transformer module are connected to an input end of the signal conditioning module separately, an output end of the signal conditioning module is connected to an analog quantity sampling input port of the signal processing module, a communication port of the signal processing module is connected with a communication end of the display and input module, and thepower module supplies power to the signal conditioning module, the signal processing module and the display and input module respectively. The transformer zero sequence differential protection self-checking system and the transformer zero sequence differential protection self-checking method improve the zero sequence differential polarity verification efficiency, improve the operation reliabilityof zero sequence differential protection, prevent maloperation accidents after transformer zero sequence differential operation, and reduce the operation cost; and the transformer zero sequence differential protection self-checking method is simple in operation and is convenient and practical.

A calibration device is provided. The calibration device includes a frame, a first optical sensing device, a second optical sensing device and a third optical sensing device. The frame includes a bottom plate and at least four sidewalls, wherein the sidewalls have a first grating hole, a second grating hole, a third grating hole and a fourth grating hole at a first height. The bottom plate has an image recognition pattern, a first measurement point, a second measurement point and a third measurement point.

The invention belongs to the technical field of laser processing, and particularly relates to an iterative calibration method and system for optical distortion and poses of a laser scanning system. The method comprises the following steps: S1, generating N ideal points; s2, performing two-dimensional coordinate transformation on the ideal point; s3, N actual points are printed on the target paper on the translation table; s4, calculating target coordinates of the N translation stages; s5, measuring the coordinate of the current target coordinate point in the camera coordinate system; s6, performing data processing by using the rotation matrix; s7, calculating the transformed rotation matrix and a vector from the original point of the camera to the original point of the laser scanning system; s8, calculating to obtain a distortion coefficient matrix obtained by current iteration; s9, fusing the data obtained by the current iteration with the value of the last iteration, and taking the fused value as the input value of the next iteration; and S10, repeating the steps S2 to S9 to obtain a final calibration result. The method has the advantages of being convenient to operate and high in calibration precision.

The invention belongs to the technical field of network switching, and in particular relates to a security switching chip, an implementation method and a network switching device based on a mimetic idea. Packet headers and cache packet data; parse through heterogeneous parsing algorithms, and make mimic judgments on the parsing results; generate packet descriptors based on the judgment results, which contain at least packets related to packet forwarding policy behaviors Feature information; look up the entry cache based on mimetic entry verification to obtain forwarding policy behavior data and update the packet descriptor; extract the corresponding packet data from the cached packet data, and send the extracted packet data in the form of data packets to the corresponding port. The present invention enhances the security and reliability of the switching chip by introducing technologies such as de-cooperative cache, mimic forwarding engine, and mimic table entry verification, and has important guiding significance for the development of network switching technology.

The embodiment of the invention discloses a substation undervoltage relay verification device, system and method. The transformer station undervoltage relay verification device comprises a rectifier used for accessing commercial power and converting the commercial power into direct current, a slide rheostat electrically connected with the rectifier and used for adjusting the voltage of the direct current, an inverter electrically connected with the slide rheostat and the substation undervoltage relay, and used for converting the voltage-regulated direct current into alternating current and outputting the alternating current to the substation under-voltage relay, a signal collector electrically connected with the substation undervoltage relay and used for collecting an action signal of the substation undervoltage relay, and a controller electrically connected with the rectifier, the slide rheostat, the inverter and the signal collector, and used for controlling the working states of the rectifier, the slide rheostat and the inverter and determining the state of the substation under-voltage relay according to the action signal. According to the technical scheme provided by the embodiment of the invention, the verification reliability of the undervoltage relay of the transformer substation can be improved.

The invention discloses a hydraulic calibration device and calibration method for a flexible force sensor array. The calibration device comprises a control module, a pressurization module, a pressure applying module, an acquisition module and a calibration module. The control module controls the pressurizing module to apply pressure to downwards press a partition layer of the pressurizing module, the pressurizing module uniformly applies the pressure to a flexible force sensor array of the acquisition module, the acquisition module acquires the pressure and transmits the pressure to the calibration module through a corresponding circuit, and the calibration module performs calibration; the calibration method comprises a pressure balancing part and a pressure calibration part, pressure is collected under ten pressure levels, a sensor array is balanced through a balance matrix, and a ten-point method is used for calibration. Through the device and the method, the calibration efficiency, accuracy and safety of the flexible force sensor array are improved, and the purpose of conveniently, quickly and accurately calibrating the flexible force sensor array is achieved.

The invention relates to the field of communication security, and in particular relates to a data security transmission system and method. The system comprises user nodes A1, A2,..., An, fidelity system nodes a1, a2,..., an in one-to-one correspondence with the user nodes, and a plurality of broadcast points. Any user node Ai comprises a user terminal and an application system, and the applicationsystem comprises a sending terminal and a receiving terminal. An object of directly transmitting data by any fidelity system node ai is only limited to a user node Ai corresponding to the fidelity system node ai and any other fidelity system node aj. Data are not directly transmitted between the non-corresponding fidelity system node ai and the user node Aj.