48results about How to "Eliminate the impact of detection accuracy" patented technology

The invention discloses a weld appearance shape based on line laser scanning and a surface defect detection method. The method comprises the steps of acquiring the actual profile curve of any section of a welded joint by laser; carrying out high-dimensional fitting on the actual profile curve to obtain a fitting profile curve, so as to obtain a first-order derivative curve of the fitting profile curve; determining the addressing ranges of the starting point and the final point of the welded joint by the first-order derivative curve; finding a point which has maximum differential value with the fitting profile curve on the actual profile curve as the starting point and final point of the section of the welded joint to obtain an integrally three-dimensional profile image of the welded joint. The welded joint is deemed to have a defect when a differential value between any point of the profile curve of the welded joint and the fitting profile curve exceeds the preset standard value. According to the detection method provided by the invention, the starting point and the final point of the welded joint can be accurately judged, and various surface defects of the welded joint can be precisely judged.

The invention discloses a finger pulse oximeter, which relates to the field of the detection of pulse and blood oxygen saturation. The finger pulse oximeter comprises a detection host and a soft shell, wherein the detection host comprises a circuit board, a display screen electrically connected with the circuit board and so on, the soft shell comprises a soft finger cot which is provided with insert holes for fingers of examinees to insert, and a first receiving part which is integrated with the soft finger cot and is provided with a first receiving chamber, and the circuit board and the display screen of the detection host are received and fixed in the first receiving chamber. The finger pulse oximeter overcomes the pressure difference existing in the prior product caused by different finger thicknesses of the examinees, and ensures that the fingers are closely contacted with a photoelectric device, thereby effectively eliminating the influence of the pressure and ambient light on the detection accuracy, effectively protecting the host, and preventing the break and damage caused by falling or impact.

The invention relates to a different load identifying dehydration control method. Different acceleration time is comprehensively applied, rotational inertia detection is carried out, the detection accuracy for clothes eccentricity is improved, and influence of the clothes amount on the eccentricity detection accuracy is eliminated; if clothes do not pass the detection at different eccentricity detection speeds, different acceleration time is adopted in a new trial, the passing rate is effectively improved, and the actual re-trial frequency is reduced; and single large clothes can be identified, and the problem that single large clothes cannot be dehydrated is solved by different control modes.

The invention which relates to an automatic constant temperature type photoacoustic detection device for SF6 decomposed components and an experiment method thereof belongs to the technical field of SF6 gas insulation device partial discharge online monitoring. The device is characterized in that an automatic constant temperature system is arranged in present infrared photoacoustic spectrum monitoring systems; and according to the method, the device is utilized to detect the SF6 gas partial discharge decomposed components in a GIS (gas insulated substation) simulation element under automatic preset temperature constancy conditions. According to the invention, the influence of external environment can be eliminated, the gas components of SO2, CO2, CF4, SO2F2, SOF2 and the like with the concentrations of low to 0.01muL / L can be effectively detected, the accuracy, the detection precision and the stability are high, and performances of a solid state relay are stable, so the long-term effective working of the automatic constant temperature system can be guaranteed. The device which can be widely applied to the field of the SF6 gas insulation equipment partial discharge online monitoring is especially suitable for detecting the SF6 gas partial discharge decomposed components in the GIS.

The invention discloses a device for measuring the waster draught of an inland ship based on sonar synchronous scanning. By using the device, the water draught of a ship is measured on line by adopting a sonar receiving device and a sonar transmitting device which move synchronously. The invention further discloses a measuring method based on the device. The device and the measuring method have the beneficial technical effects that sonar arrays are avoided being arranged in a high-density way through the scanning detection of a single set of the sonar transmitting device and the sonar receiving device; the equipment cost is decreased; synchronously, the requirements on the beam characteristics of sonar signals are decreased greatly; the problem that signals interfere mutually does not exist; the influence of a sonar divergence angle on detection precision is eliminated; and the detection precision can be improved to the utmost extent.

The invention discloses a system and a method for accurately calibrating an optical path of a point diffraction interferometer based on image information. The system comprises spectroscopic prisms, abeam expanding collimation system, a diffraction orifice plate, a wave-front sensor, lenses, an optical power meter, three-dimensional precision electronically controlled translation stage and driverthereof, a CCD1 (charge-coupled device), and a computer. The method comprises the following steps of: analyzing and obtaining a mathematical relationship between an alignment error and a diffraction wave-front deviation by using the Rayleigh-Sommerfeld diffraction theory; designing an accurate optical path calibration system according to requirements to obtain a spot-hole alignment image and lightintensity before and after the diffraction orifice plate; then analyzing and measuring alignment deviation information through an image processing algorithm to establish a mathematical model betweenthe measurement quantity and the control quantity; and finally, achieving accurate calibration according to a system implementation principle. According to the system and the method for accurately calibrating the optical path of the point diffraction interferometer based on the image information, the precise alignment of the diffraction holes and the spot in the visual environment is realized, andthe influence of the alignment deviation on the detection precision of the point diffraction interferometer to some extent is eliminated. The system and the method have characteristics of high precision and high efficiency, and reduce the damage of the laser to the vision of operators during experimental operation.

The invention provides a method for eliminating circular symmetry phase computer-generated holography substrate fringe pattern distortion. After light emitted from an expanding light source passes through two arms of a Twyman-Green interferometer, equal inclination interference occurs, equal inclination interference circular fringes which are sparse in the center and dense on edges are generated and recorded through an electric coupling device, a circular grating is generated through concentric circular fringes which are generated through the equal inclination interference, and a computer-generated holography substrate is processed through opaque liquid so that a circularly symmetric two-value amplitude type grating is generated; the concentric circular strips etched on the circularly symmetric two-value amplitude type grating and the equal inclination interference circular fringes on the circular grating are set so that a moire fringe condition is formed; and a moire fringe pattern with fringe pattern distortion information and a moire fringe pattern without the fringe pattern distortion information are recorded through a computer, the two moire fringe patterns are compared, data are processed so that a computer-generated holography substrate fringe pattern distortion value is obtained, influence on an aspheric surface detection result by the computer-generated holography substrate fringe pattern distortion is eliminated through an artificially synthesized distortion pattern, and aspheric surface high-accuracy detection is achieved.

The invention discloses a gas concentration inversion method and system based on multiple harmonic joint analysis. The method comprises steps of determining best modulation level of a sinusoidal modulation signal corresponding to each harmonic joint manner; separately collecting even harmonic component of target gas in each harmonic joint manner under set target concentration, acquiring harmonic joint peak of each harmonic joint manner and repeating for K times, and calculating harmonic joint target peak by using a maximum of harmonic joint peaks after K times; regulating target concentrationof target gas, and repeating the steps till harmonic joint target peak of the target gas in each preset target concentration is acquired; fitting the harmonic joint target peak and the target concentration of the target gas so as to obtain a target gas concentration inversion formula; and calculating to-be-tested concentration of the target gas by using the target gas concentration inversion formula. The method excavates concentration information included in other even harmonic components, thereby further increasing signal to noise ratio of the concentration inversion criterion.

A gas appliance flame ionization current detecting circuit comprises a MCU, IO ports of MCU include a P0 port, a P1 port, a P2 port, a P3 port with MCU timing / counting functions. The gas appliance flame ionization current detecting circuit further comprises a fixed value capacitance C1, a resistor R1, a fixed value resistor R2, a first connector and a second connector. One end of the fixed value capacitance C1 is electrically connected with the P0 port, the other end of the fixed value capacitance C1 is electrically connected with the P1 port, one end of the fixed value resistor R2 and the second connector at the same. The other end of the value resistor R2 is electrically connected with the P2 port. One end of the resistor R1 is electrically connected with the P3 port, the other end of the resistor R1 is electrically connected with the first connector. An output interface of the first connector is electrically connected with a flame probe or a burner. The circuitry detection method that an output interface of the second connector is electrically connected with the burner or the flame probe includes the steps of MCU initialization, charging and discharging to the fixed value capacitance C1 continuously. The detection method has the advantages that flame equivalent impedance can be detected precisely and the affection to the precision of detection caused by environment can be removed.

The invention provides an output voltage detection circuit. The output voltage detection circuit comprises a flyback transformer, a discharging detection circuit, a pulse generator, a RS trigger and an output voltage detection circuit, wherein the discharging detection circuit comprises a first comparator, the first comparator is used for sampling to acquire a voltage when a secondary winding is discharged and comparing the voltage with a first reference voltage, the pulse generator is used for generating a pulse signal according to a comparison result of the comparator and a periodic drivingsignal, the RS trigger is used for outputting a level signal of indicating whether discharging of the secondary winding is ended or not according to the pulse signal, the output voltage detection circuit comprises a second comparator, a delay circuit and a D trigger, the second comparator is used for sampling a voltage when the secondary winding is discharged and comparing the voltage with a second reference voltage, the delay circuit is used for delaying an output of the second comparator, and the D trigger is used for locking an output signal of the delay circuit according to the level signal, indicating the discharging ending of the secondary winding, output from the RS trigger and outputting a voltage, acquired by sampling, of the flyback transformer after delay time and before delay time of the delay circuit. By the output voltage detection circuit, the output voltage state can be detected after the secondary winding is approximate to complete discharging.

The invention discloses a blade-heavy-metal-content detection method with the moisture content corrected based on the Ca element ratio. The blade-heavy-metal-content detection method includes the steps that 1) blade samples with the different heavy-metal contents are obtained, and the samples are pretreated; 2) the heavy-metal contents in the samples are detected with the standard method; 3) LIBS spectral lines of the samples at different positions are collected; 4) obtained spectral signals are pretreated; 5) the peak strength of the LIBS spectral lines corresponding to detected heavy-metal elements and the peak strength of the LIBS spectral line corresponding to a Ca element are extracted; 6) the detected heavy-metal content serves as an output value, the strength ratio of the detected heavy-metal elements to the Ca element serves as an input value, and a calibration model is established; 7) the spectral lines of to-be-detected samples are collected, and the peak strength of the LIBS spectral lines corresponding to the detected heavy-metal elements and the peak strength of the LIBS spectral line corresponding to the Ca element are extracted in the pretreated spectral signals and input into the calibration model, and the content of heavy metal is obtained. According to the blade-heavy-metal-content detection method, the moisture contents in the samples are corrected, the influence of the moisture contents in the samples on heavy metal detection is eliminated, and the detection accuracy is increased.

The invention discloses a K-element ratio based water content calibrating type heavy metal content detecting method for leaves. The method comprises the following steps: 1) obtaining leave samples with different heavy metal contents, and preprocessing the samples; 2) detecting the heavy metal contents in the samples through a standard method; 3) acquiring LIBS (Laser-induced Breakdown Spectroscopy) spectrum lines of different positions of the samples; 4) preprocessing the obtained spectrum signals; 5) extracting LIBS spectrum line peak intensity corresponding to the detected heavy metal element and K element; 6) building a calibration mode by treating the tested heavy metal content as the output and the intensity ratio of the detected heavy metal element to the K element as the input; 7) acquiring the spectrum lines of the samples to be detected, extracting the LIBS spectrum line peak intensity of the heavy metal element and the K element from the preprocessed spectrum signal, and inputting into the calibration mode to obtain the heavy metal content. According to the method, the water contents in the samples are calibrated, so that the influence of the water contents in the sample on the heavy metal detection can be removed, and as a result, the detection accuracy is improved.

The invention relates to a digital electric meter capable of dynamically compensating and correcting reading. The digital electric meter comprises an OP amplifier, an analog-digital converter, a microprocessor and a display; wherein the input terminal of the OP amplifier is provided with a detector, and the input terminal is further provided with a dynamic compensating unit, the dynamic compensating unit can generate different bias voltage values along with ambient temperature variation, and the bias voltage value is dynamically applied onto the input terminal of the OP amplifier, thus compensating and correcting zero drift caused by the OP amplifier owning to ambient temperature variation, so that detection reading of the digital electric meter is not influenced by ambient temperature and is more accurate.

The invention provides an online detection method for deviation of hot-rolled strip steel, and belongs to the technical field of plate and strip rolling automation. According to the method, a machine vision technology is adopted, a binocular linear array camera is used for collecting strip steel images in real time, the real-time width and deviation amount of the strip steel are calculated through means such as edge detection, the influence of loop angle swing on a detection result is effectively eliminated, and finally camera error compensation is added to guarantee the detection precision. According to the strip steel deviation amount detected through the method, the deviation detection precision of the strip steel can be improved to the millimeter level, and a reliable basis is provided for follow-up strip steel deviation control.

The invention discloses a detection device for rapidly measuring the camber height and an operation method, and belongs to the technical field of constructional engineering detection. The device comprises a left support, a right support and a connecting frame connecting the left support and the right support, a sliding seat is slidably mounted on the connecting frame, a guide hole is formed in the sliding seat, a detection rod vertically penetrates through the guide hole, a roller is mounted at the bottom of the detection rod, and an anti-falling mechanism is arranged between the guide hole and the detection rod. The connecting frame is installed on the left support and the right support, the sliding seat is installed on the connecting frame in a sliding mode, the sliding seat slides on the connecting frame to drive the detection rod to move left and right, in the moving process, the bottom of the detection rod moves along the camber face through the idler wheels, then the detection rod only moves upwards through the anti-disengaging structure on the detection rod, and then the highest camber height is detected. The use efficiency of the device is improved, the camber height can be directly obtained, and the detection efficiency is greatly improved.

The invention provides a high-precision water quality detection device capable of automatically absorbing surrounding water. The invention relates to the technical field of water quality detection devices, and aims at solving the problems, in use, that more impurities exist in the water area, and the detection precision is low due to limited detection range caused by low flowability of some waterareas, and impurities easily enter the detection device due to large suction force of a pump suction type detection device, the detection precision is easily reduced due to long-time use, and even thedetection effect is invalid. The detection device comprises a detection box body, and a corresponding upper sealing plate is fixedly blocked at the box opening at the upper end of the detection box body. Due to the fact that the water absorption filtering cover and the detection box body are installed obliquely downwards by 45 degrees, water flows back to the exterior of the device under the effect of turbulent flow, a filtering effect is achieved, the water quality detection accuracy of the device is guaranteed, and the service life of the device is prolonged.

The invention provides an output voltage detection circuit. The output voltage detection circuit comprises a flyback transformer, a discharging detection circuit, a pulse generator, a RS trigger and an output voltage detection circuit, wherein the discharging detection circuit comprises a first comparator, the first comparator is used for sampling to acquire a voltage when a secondary winding is discharged and comparing the voltage with a first reference voltage, the pulse generator is used for generating a pulse signal according to a comparison result of the comparator and a periodic drivingsignal, the RS trigger is used for outputting a level signal of indicating whether discharging of the secondary winding is ended or not according to the pulse signal, the output voltage detection circuit comprises a second comparator, a delay circuit and a D trigger, the second comparator is used for sampling a voltage when the secondary winding is discharged and comparing the voltage with a second reference voltage, the delay circuit is used for delaying an output of the second comparator, and the D trigger is used for locking an output signal of the delay circuit according to the level signal, indicating the discharging ending of the secondary winding, output from the RS trigger and outputting a voltage, acquired by sampling, of the flyback transformer after delay time and before delay time of the delay circuit. By the output voltage detection circuit, the output voltage state can be detected after the secondary winding is approximate to complete discharging.

The invention discloses a weld appearance shape based on line laser scanning and a surface defect detection method. The method comprises the steps of acquiring the actual profile curve of any section of a welded joint by laser; carrying out high-dimensional fitting on the actual profile curve to obtain a fitting profile curve, so as to obtain a first-order derivative curve of the fitting profile curve; determining the addressing ranges of the starting point and the final point of the welded joint by the first-order derivative curve; finding a point which has maximum differential value with the fitting profile curve on the actual profile curve as the starting point and final point of the section of the welded joint to obtain an integrally three-dimensional profile image of the welded joint. The welded joint is deemed to have a defect when a differential value between any point of the profile curve of the welded joint and the fitting profile curve exceeds the preset standard value. According to the detection method provided by the invention, the starting point and the final point of the welded joint can be accurately judged, and various surface defects of the welded joint can be precisely judged.

The invention provides a high-voltage transformer group operation state real-time acquisition system, which obtains the dielectric loss of a high-voltage transformer based on the secondary side voltage and leakage current of the high-voltage transformer, and performs mutual verification on the pressure, humidity and temperature data and the dielectric loss analyzed based on the secondary side voltage and leakage current. The fault monitoring reliability of the system is enhanced; compared with the traditional ultrasonic partial discharge detection method, the method for detecting the leakage current at the tail end of the equipment by adopting the micro-current sensor has the advantages that the anti-interference capability is stronger, useful signals can be extracted from noise, and the error of system detection is reduced.

The invention discloses a vacuum adsorption type clamp holder based on a flexible wrist structure. The vacuum adsorption type clamp holder based on the flexible wrist structure comprises a flexible wrist, an adsorber and an electromagnet, wherein the flexible wrist comprises an outer frame and a rotating part arranged in the outer frame; the adsorber comprises an air cylinder, a piston, an elastic piece, an air passage and an adsorption pipe; the air cylinder is mounted on the rotating part; the piston is arranged in the air cylinder; one end of the elastic piece is connected with the piston; the other end of the elastic piece is connected with the inner bottom wall of the air cylinder; the air passage communicates with the air cylinder; the adsorption pipe communicates with the air passage; and the electromagnet corresponds to the piston. According to the vacuum adsorption type clamp holder based on the flexible wrist structure provided by the invention, the air cylinder, the air passage and the adsorption pipe are all integrated together, so that the size of the vacuum adsorption type clamp holder is greatly reduced, and miniaturization of the adsorption type clamp holder is achieved; on the other hand, due to the fact that the size is reduced, the clamp holder can be completely integrated in a micro-force sensor, and the problem that an adsorption type clamp holder cannot complete micro-force detection is solved; the deflection detection of micro-newton-level micro stress is realized; and the piston is pulled through a spring, so that the inside of the air cylinder is always kept in a negative-pressure state.

The invention discloses an Mg element ratio based water content calibrating type heavy metal content detecting method for leaves. The method comprises the following steps: 1) acquiring leave samples with different heavy metal contents, and preprocessing the samples; 2) detecting the heavy metal contents in the samples through a standard method; 3) acquiring LIBS spectrum lines of different positions of the samples; 4) preprocessing the obtained spectrum signals; 5) extracting LIBS spectrum line peak intensity corresponding to the detected heavy metal element and the Mg element; 6) building a calibration mode by testing the detected heavy metal content as the output and the intensity ratio of the detected heavy metal element to the Mg element as the input; 7) acquiring the spectrum lines of the samples to be detected, and extracting the LIBS spectrum line peak intensity of the heavy metal element and the Mg element from the preprocessed spectrum signal, and inputting into the calibration mode to obtain the heavy metal content. According to the method, the water contents in the samples are calibrated, so that the influence of the water contents in the samples on the heavy metal detection can be removed, and as a result, the detection accuracy is improved.

The invention belongs to medical examination equipment, relates to a component structure of a glycosylated hemoglobin analyzer, and particularly relates to an internal heating device of a clinical sample machine of a glycosylated hemoglobin analyzer. The internal heating device comprises a peltier part, a heating seat is connected to one side of a radiating surface of the peltier part, a cooling seat is connected to one side of a heat absorption surface of the peltier part, a heating tube is disposed on the heating seat, a cooling tube is arranged on the cooling seat, an inlet of the heating tube is connected with a sample liquid supply pipeline of the glycosylated hemoglobin analyzer, an outlet of the heating tube is connected with an inlet of the cooling tube by a transitional tube, andan outlet of the cooling tube leads to a chromatographic column of the glycosylated hemoglobin analyzer. The internal heating device is simple in structure, convenient in operation, reliable in running and high in efficiency.

The invention provides a method for eliminating circular symmetry phase computer-generated holography substrate fringe pattern distortion. After light emitted from an expanding light source passes through two arms of a Twyman-Green interferometer, equal inclination interference occurs, equal inclination interference circular fringes which are sparse in the center and dense on edges are generated and recorded through an electric coupling device, a circular grating is generated through concentric circular fringes which are generated through the equal inclination interference, and a computer-generated holography substrate is processed through opaque liquid so that a circularly symmetric two-value amplitude type grating is generated; the concentric circular strips etched on the circularly symmetric two-value amplitude type grating and the equal inclination interference circular fringes on the circular grating are set so that a moire fringe condition is formed; and a moire fringe pattern with fringe pattern distortion information and a moire fringe pattern without the fringe pattern distortion information are recorded through a computer, the two moire fringe patterns are compared, data are processed so that a computer-generated holography substrate fringe pattern distortion value is obtained, influence on an aspheric surface detection result by the computer-generated holography substrate fringe pattern distortion is eliminated through an artificially synthesized distortion pattern, and aspheric surface high-accuracy detection is achieved.

The invention relates to a metallic nano material toxicity detection board and a detection method thereof in the nano technical field. The toxicity detection board comprises a base, a board cover and a detection cell, and is characterized in that the base is a rectangular container; a plurality of vertical positioning columns are arranged on the inside bottom of the base so that the edges of the detection cell can be located on the base; and clasping edges are arranged at the periphery of the board cover to clasp the edges of the base. The method of the invention takes the possible degradation and metabolic components inside modification molecules into full consideration, and determines the cytotoxicity grade of metallic nano particles through a double step detection method, so that the selection of proper metallic nano particles and the modification molecules in future can be standardized and unified, and easy to repeat and compare.

The invention discloses a self-adaptive detection control system and method for the narrow gap weaving arc welding width. By the adoption of the self-adaptive detection control system and method, the defects that when the existing narrow gap welding width is nonuniform, undercut, slag inclusion, nonuniform weld joints and the like are caused are overcome. According to the main points of the technical scheme, in the welding process, a weaving arc sensor controls an electric arc to swing so as to conduct scanning in the position of a slope, signals are collected by the sensor, the centering position deviation is determined by comprising the pulse number on the left side with the pulse number on the right side, the welding width change is judged by comparing the pulse sum, the swing amplitude of a welding torch is adjusted, and accordingly self-adaptive control and automatic centering of a welding gun are achieved. A detection algorithm is simple, the responds speed is high, the detection accuracy is high, the welding stability of the narrow gap weaving arc welding is improved, and welding defects are avoided.

The invention discloses a method for detecting the concentration of vitamin A and vitamin E in human dried blood spots. The method comprises the following steps: 1) preparing a calibrator; (2) preparing a quality control product, wherein the quality control product comprises a VA group quality control product and a VB group quality control product; (3) respectively preparing the prepared calibrator and the prepared quality control product into dried blood spot sample cards, and setting two blank control sample cards; (4) preparing a sample extracting solution, wherein the components of the sample extracting solution comprise vitamin VA-D6, vitamin VE-D6 and methanol; (5) adding the prepared calibrator, the quality control product, the sample to be detected and the sample extracting solution into a pretreatment container for pretreatment for sample loading analysis for later use; (6) carrying out pretreatment on the blank sample; and 7) carrying out chromatography-mass spectrometry detection on the sample to be detected by using an ultra-high performance liquid chromatography-tandem mass spectrometry UPLC-MS / MS system and adopting an internal and external standard combination method. The detection method provided by the invention has the advantages of short analysis time, accurate detection degree, simple pretreatment, low detection cost and the like.

The invention relates to the field of glass manufacturing, and discloses glass particle inspection equipment. The glass particle inspection equipment comprises a particle inspection machine (10) and a sealing cover (20), the sealing cover (20) covers the particle inspection machine (10), and the sealing cover (20) comprises an opening capable of being opened and closed to allow glass to enter and exit from the sealing cover (20). The sealing cover can seal and cover the particle inspection machine, so that the area around the particle inspection machine is in a relatively closed and stable state, the influence of the surrounding environment and the fluctuation of the surrounding environment on the detection precision of the particle inspection machine can be remarkably eliminated, and the glass particle inspection precision is improved.

A bent-tail chute type bulk material flowmeter comprises a feed hopper mounted on a rack, a flow adjusting door arranged at a discharge port of the feed hopper, a detecting chute obliquely mounted below the discharge port of the feed hopper as well as a weighing sensor arranged on the bottom surface of the detecting chute. The flowmeter is characterized in that the detecting chute is placed on a fulcrum tool set in a movably-hinging support manner through a support seat arranged at the upper part of the bottom surface, and the weighing sensor is supported at the lower part of the bottom surface of the detecting chute in a point support manner; a counter weight for balancing the weight of the chute and reducing extra pressure of the weighing sensor is arranged at the support seat at the upper part of the bottom surface of the detecting chute.

The invention provides a machine vision-based method for processing deviation curves between finishing strip steel stands, and belongs to the technical field of steel rolling automation. This method uses the binocular line array camera installed on the top of the frame to detect the strip steel. First, extract the strip steel edge from the collected strip steel image, and obtain the edge coordinates of the left and right sides of the strip steel image; then calculate the width of the strip steel. Then calculate the difference between the actual strip width measured by the exit width measuring instrument and the strip width obtained by detection, and form a judgment model through data fitting, and carry out the deviation data corresponding to the width difference exceeding the threshold. Filter, take the previous deviation value as the deviation value of this point. The method calculates the difference between the strip width measured at the detection moment and the actual width, and filters the deviation data corresponding to the width difference data whose difference exceeds a threshold, so as to achieve the purpose of removing noise from the deviation curve.