77results about How to "Reduce acquisition error" patented technology

The invention discloses an automatic thickness control system and method of a blown film. The automatic thickness control system of the blown film comprises a film thickness detection module, a film thickness control module, a film cooling and forming mold with a plurality of brushless direct-current motors as well as a control panel. According to the invention, an FPGA (field programmable gate array) control chip of a programmable logic device is utilized to achieve a fuzzy control algorithm so as to obtain the speed control quantity of the brushless direct-current motors; by combining a double-closed-ring control algorithm for the brushless direct-current motors a control signal output by the FPGA control chip is changed and adjusted correspondingly when the thickness of the film is changed; the thickness uniformity of the films at different circumferential parts can be controlled by acquiring horizontal thicknesses of the films at controlled subzones and the positions of air flue openings corresponding to the films via transmission and decoupling control, so that the control requirement on horizontal thickness uniformity of the films can be met; the automatic thickness control system and method of the blown film are high in integrity, small in volume, good in robust performance, stable and reliable in operation, high in expansibility, high in control precision, low in accumulative error, and high in adaptability.

The invention discloses a surrounding type fingerprint acquisition method. The surrounding type fingerprint acquisition method is characterized by comprising the following steps: (1) setting a fingerprint acquisition module, wherein the fingerprint acquisition model comprises a housing, a shooting module and a light supplementing module, wherein the housing is a transparent or semitransparent component and is used for bearing a finger, and the shooting module corresponds to the housing and is used for shooting a fingerprint on the housing, the light supplementing module is used for supplementing light for a shooting environment, the light supplementing module comprises a light diffusion plate and a plurality of light supplementing lamps which are annularly arranged around the shooting module and radiate light upwards, and the light diffusion plate is arranged above the light supplementing lamps and is used for diffusing and homogenizing the light; (2) pressing the finger on the housing, supplementing light through the light supplementing module and directly shooting a fingerprint image through the shooting module. The invention also discloses a surrounding type fingerprint acquisition structure for implementing the method. According to the surrounding type fingerprint acquisition method, the fingerprint can be acquired by direct shooting, the structure is concise and the form can be freely changed. In addition, surrounding light supplementing is adopted, so that the fingerprint is more distinct and distortion is reduced.

The invention relates to a lane reference line construction method and device and a storage medium, and belongs to the field of automatic driving. The method comprises the following steps of: collecting original lane trajectories, dividing original lane track lines according to a certain distance; calculating a course angle of an original lane track line segment in each distance interval after division; solving a course angle mean value of the track line segment; obtaining a track line segment with the minimum difference with the mean value of the interval course angles and a corresponding minimum difference value; selecting the minimum value in the minimum difference values of the distance intervals, taking the track line segment corresponding to the minimum value as an initial reference line, and selecting the track line segment to be spliced with the initial reference line according to the course angle deviation between the initial reference line and the track line segment in the adjacent distance interval to obtain a lane reference line. According to the scheme, the accuracy of the lane reference line can be improved, and accurate drawing of the lane marking line is facilitated.

The invention discloses a cell morphology reconstruction oriented three-dimensional image information acquisition method and device. An objective table is fixedly connected with four vertically arranged micro telescopic rods; screws at the upper ends of the micro telescopic rods are fixedly connected to four corners of a glass slide rack in sequence; motors in the micro telescopic rods are connected with a motor control module by virtue of control lines; the motor control module is connected with an upper computer by virtue of an MCU (Micro Control Unit) system 23; a camera is positioned justabove the motor control module; an optical collector is arranged outside the camera in a sleeving manner and is composed of a halogen lamp, an organic panel, the micro telescopic rods and micro telescopic rod fixing bases; the motors in the micro telescopic rods are connected with the motor control module by virtue of control lines; and the motor control module is connected with an upper computerby virtue of the MCU system. The inclination of the cell slide is changed by regulating the heights of two adjacent micro telescopic rods on the objective table, the small-angle rotation of the slideand rotation surface direction change of the slide are realized, and irrelevant three-dimensional morphology information is acquired, so that the morphology reconstruction accuracy is improved.

The invention discloses a directly-photographed fingerprint acquisition method which is characterized by comprising the following steps: (1), setting a fingerprint acquisition module which comprises a housing cover, a photographing module and a light filling module, wherein the housing cover is a transparent or semitransparent component for carrying a finger, the photographing module corresponds to the housing cover to photograph a fingerprint on the housing cover and the light filling module is used for filling light for a shooting environment; (2), pressing the finger on the housing cover, filling light by the light filling module, and the photographing module directly photographs a fingerprint image. The invention also discloses a directly-photographed fingerprint acquisition construction used for implementing the method. The method and the construction have the advantages of small size, low cost, excellent operation experience and the like. The implement method is innovated, the photographing module is used for directly photographing the fingerprint so as to acquire the fingerprint, and the light filling module is matched with the photographing module to photograph for more than sixty times within one second in a state of white light and blue light conversion, so that finger acquisition errors are reduced and fake fingerprints are avoided. Moreover, the construction is simple and the product modality can be changed at will.

The invention discloses a voice signal conversion method and device, equipment and a storage medium. The method comprises the following steps: respectively segmenting an original voice signal and an initial target voice signal obtained by modifying the tone of the original voice signal, and then carrying out Fourier transform to obtain a segmented original frequency domain signal and a segmented target frequency domain signal; filtering the segmented original frequency domain signal through an original segmented window function to obtain a corresponding original formant envelope, and filteringthe segmented target frequency domain signal through a target segmented window function to obtain a corresponding target formant envelope; and determining a tone-changing voice signal according to the segmented target frequency domain signal, the original formant envelope and the target formant envelope. According to the technical scheme provided by the embodiment of the invention, the influenceof the target formant envelope on tone modification is eliminated, so the same formant envelope exists before and after tone modification, the consistency of sound characteristics in the voice signalsbefore and after tone modification is ensured, and the voice quality of the tone-modified voice signals is improved.

The invention discloses an experiment device for ground penetrating radar CT (Computed Tomography) transmission detection. The device comprises a box body, an antenna moving driving system, a ground penetrating radar transmitting antenna, a ground penetrating radar receiving antenna, a radar host, and a base. The ground penetrating radar transmitting antenna and the ground penetrating radar receiving antenna are arranged on two sides of the box body, and are connected with the antenna moving driving system. The ground penetrating radar receiving antenna is connected with the radar host. The experiment device for ground penetrating radar CT transmission detection has the advantages that the antenna moving driving system can control the ground penetrating radar transmitting antenna and the ground penetrating radar receiving antenna to automatically complete data acquisition according to a preset path, so that accurate recordings of data track numbers and detection position information are achieved, and data acquisition errors are reduced; and automatic acquisition of data can effectively reduce electromagnetic wave interference caused by operators, so that experiment operation flow is simplified.

The present invention discloses a method for realizing synchronization data acquisition based on a passive optical network. Multiple passive optical networks are in one PON host or multiple PON hosts, through the method of clock sharing or clock synchronization, the synchronization among passive optical networks is realized, and a unified clock counter is ensured between an OLT and an OLT. With a passive optical network as a communication media, based on the cyclical synchronization data acquisition time stamp of an OLT reference clock counter, by using ranging and time delay compensation technology, the synchronization data collection by the ONUs of the passive optical networks at the same time is realized, thus the whole network synchronization data collection is realized, and the method has high time transfer precision. The e synchronization data is transferred to the ONU local processor for processing, or according to different application requirements, a suitable communication protocol is customized, after the protocol is completed, the synchronization data is packaged and is uploaded through a fiber network for processing, and the method has the advantages of reliable transmission and high communication bandwidth.

The invention discloses an LED splicing gap bright and dark line correction method and device, a storage medium and a terminal. A splicing gap is corrected through a correction coefficient corresponding to the splicing gap; the phenomenon that visual bright and dark lines exist between the display units (modules or box bodies) of the LED display screen during watching due to splicing gaps caused by reasons such as the machining precision and the assembling precision of the display units (modules or box bodies) can be rapidly and accurately improved; the scheme is not influenced by the environment, the visual bright and dark lines at the abutted seams can be quickly corrected while correction is performed, and the time for manually correcting the seams of the display units (modules or box bodies) is saved; according to the scheme, a Gaussian filtering method is adopted, and the optimal difference of the gap splicing effect can be judged by calculating the number of steps of a smooth one-dimensional curve; the correction coefficient is calculated by extracting the pixel gray average value, so that the acquisition error can be reduced, and the problem of excessive correction or insufficient correction is avoided.

The invention discloses a novel method for calibrating or calibrating impact velocity by using an impact velocity measuring device. The impact velocity measuring device comprises a signal receiving antenna, a spectrum processing module and a signal processing module, wherein the signal processing module comprises a quadrature mixer, an amplification circuit, an automatic gain control circuit and an A / D converter which are in signal connection with one another sequentially. The impact velocity measuring device is characterized in that the signal receiving antenna is a 35dB high-gain receiving antenna; a filtering circuit and a shaping circuit are in signal connection sequentially between the amplification circuit and the automatic gain control circuit; and the output end of the shaping circuit is connected with a pulse width capture module the main frequency of which is 150MHz. According to the method of the invention, a 0.5-to-10 m / s measuring range can be obtained accurately through adopting the high-gain receiving antenna and pulse width capture; and the pulse width capture module (eCAP) the main frequency of which is as high as 150MHz is adopted to perform acquisition, frequency capture precision can be greatly improved, acquisition errors can be lowered, and high-precision velocity measurement can be realized.

The invention provides a rapid collecting method of handwriting information. The rapid collecting method of the handwriting information comprises the following steps: an input area of handwriting input equipment is divided into a plurality of sub input areas; each stroke vector and writing time of the handwriting input information of the input area of the handwriting input equipment are collected and stored; whether each stroke vector is an effective stroke vector is judged; whether ending of an input of each stroke vector is ending of a handwriting input is judged; the sub input areas in which each stroke vector is dropped is judged, and collected stroke vectors are divided into corresponding sub input areas; the stroke vectors of each sub input area are sequenced and stroke vector assemblies are formed according to the writing time of each stroke vector; and each stroke vector assembly is output. The rapid collecting method of the handwriting information has the advantages that not only input speed can be improved, but also original handwriting of handwriting input of a user can be kept, simplicity is possessed and implementation is easy, input sequence independence of the sub input areas is further possessed, reading and writing of data are convenient, and follow-up processing of data is convenient.

The present invention discloses a passive optical network data collection method based on secondary sampling. The method comprises the following steps that: an OLT periodically generates synchronization time information according to a first local clock counter; the OLT carries out ranging on an ONU, obtains a loop time delay and sends the time delay to the ONU; the ONU outputs synchronization sampling pulse according to received time information; the ONU latches the value of a second local clock counter at the rising edge of the synchronization sampling pulse; the sampling values of N periods before the synchronization sampling pulse are obtained through cache; the ONU sends the values to an interpolation module to carry out interpolation operation to obtain a synchronization sampling interpolation result and outputs the interpolation result at the falling edge of the synchronization sampling pulse, the result can be sent to an ONU local processor to carry out processing to realize data synchronous acquisition and transmission, the establishment of a time synchronization relation among multiple passive optical networks is not needed according to the provided method, the independent sampling frequency can be employed by each passive optical network, and stable and reliable synchronization collection data is obtained.

The invention relates to an augmented reality visualization method based on a depth camera and an application. The method comprises the specific steps of 1, reconstructing background point cloud through the depth camera, and obtaining target object point cloud through three-dimensional modeling; 2, reconstructing an environment point cloud based on a depth camera; 3, key feature points of the target object point cloud and the filtered environment point cloud being extracted, point cloud registration being carried out, the pose of the target object under a depth camera coordinate system being obtained, and recognition and initial positioning of the target object being completed; 4, performing three-dimensional tracking registration based on RGBD feature points; 5, selecting a key frame according to the relative pose variation of the target object of the current key frame and the next frame of image for pose optimization of the target object, and completing updating of the target objectand the target area; and 6, realizing visualization of the occlusion features. According to the method, the target object can be well recognized in a complex scene, and the real-time performance, robustness and tracking accuracy of the system are improved.

The invention provides a method and device for collecting indoor position data of a multilayer building, and a readable medium. The method comprises the following steps: obtaining a collection starting point marked by collection personnel in a starting collection layer of the to-be-collected multilayer building and geographical coordinates of the collection starting point; with the collection starting point as an original point of a Tango reference coordinate system, obtaining a deviation value of a geographical direction and a north direction identified by a 0-degree direction of the Tango reference coordinate system; and collecting three-dimensional coordinates of collection points in indoor floors of the multilayer building according to the obtained deviation value, the geographical coordinates of the collection starting point and an air pressure value collected by an air pressure sensor. By adoption of the technical scheme of the invention, the indoor position data of the multilayer building are collected based on the Tango technology, so that the collection error of the indoor position data can be reduced and the collection accuracy of the indoor position data is improved, accordingly the indoor positioning accuracy can be improved based on the collected indoor position data.

The invention relates to an intelligent signal lamp control method based on urban major and collector road intersections. Major road entrance lanes of the intersections can allow turning left, going straight and turning right and are provided with earth induction coils A1, sensors B01, sensors B03 and sensors C, major road exit lanes of the intersections are provided with earth induction coils A2,data acquired by the earth induction coils A1, the earth induction coils A2, the sensors B01, the sensors B03 and the sensors C are processed and analyzed a microprocessor M, and prolonged time of green lamps of major roads of the intersections is determined according to a delay method of the green lamps. According to the method, timing is achieved by sufficiently utilizing signals, vehicles of the intersections are evacuated, time is saved, and jam is decreased.

The invention provides an acquisition method and device of indoor position data, computer equipment and a readable medium. The method comprises the steps as follows: an acquisition starting point andinitial geographical coordinates of the acquisition starting point are obtained; acquisition is performed in an indoor road network of a building with the acquisition starting point as the origin of Tango, and a Tango track is obtained; the initial geographical coordinates of the acquisition starting point and the 0-degree direction of Tango are adjusted according to the initial geographical coordinates of the acquisition starting point, the initial geographical direction where the 0-degree direction of Tango is located, the Tango track and the road network of an indoor map of the building, sothat all acquisition points in the Tango track fall into the road network of the indoor map of the building, and the adjusted target geographical coordinates of the acquisition starting point and theadjusted target geographical direction corresponding to the 0-degree direction of Tango are obtained; position data of each indoor position point of the building are acquired according to adjustmentresults. The acquisition accuracy of indoor position data can be improved with the method.

The invention relates to the technical field of computer networks, in particular to a processing, distributing and load sharing method and a processing, distributing and load sharing system for large network safety monitoring core data models. The processing, distributing and load sharing method and the processing, distributing and load sharing system have the advantages that software parameters of monitored objects are scanned via software parameters canning client sides, all read software data are outputted to core data model processing terminals, software parameter data models are compared and analyzed by the core data model processing terminals, analysis results are transmitted to a safety monitoring server, data processing, comparing and analyzing procedures are distributed to the monitored objects to be executed by the monitored objects, the problem of excessively heavy load on an existing server is solved, and the instant safety monitoring speed is increased; burden on a network is relieved, and network congestion due to safety monitoring data transmission is prevented; interference on normal operation of users during safety monitoring data acquisition is reduced; the data acquisition efficiency is improved, and data acquisition errors are effectively reduced.

The invention relates to an edible mushroom production parameter optimizing system and method, and belongs to the technical field of edible mushroom cultivation. The system comprises a computer, a display connected with the computer, a sensor based on a Modbus communication protocol and a camera, the sensor based on the Modbus communication protocol is an environment sensor, the camera is used for monitoring the growth condition of edible mushrooms, and the sensor based on the Modbus communication protocol and the camera are connected with the computer through the Ethernet; and an edible mushroom growth model analysis system with image processing and machine learning functions is installed in the computer, the system can collect sensor experiment records, the growth vigor of edible mushrooms is observed through the camera, an edible mushroom growth model is generated, and the optimal edible mushroom area and growth environment parameters are searched in the model through a fine segmentation algorithm. The analysis granularity is finer, the result data is more detailed, the acquisition error is small, the accuracy of the experimental analysis result is improved, the manpower is saved, and the cost is reduced.

The invention relates to a system and method for optimizing production parameters of edible fungi, belonging to the technical field of edible fungi cultivation. The system includes a computer, a display connected to the computer, a sensor based on the Modbus communication protocol, and a camera; the sensor based on the Modbus communication protocol is an environmental sensor, and the camera is used to monitor the growth of edible fungi. Both the sensor and the camera based on the Modbus communication protocol pass through The Ethernet is connected to the computer; an edible fungus growth model analysis system with image processing and machine learning functions is installed in the computer. The system can collect sensor experimental records, observe the growth of edible fungi through a camera, and generate an edible fungus growth model using fine segmentation. The algorithm finds the optimal edible fungus area and growth environment parameters in the model. The present invention has finer analysis granularity, more detailed result data, small collection error, improved accuracy of experimental analysis results, saved manpower and reduced cost.

The invention discloses an LCD three-dimensional printing light equalizing method. The method comprises the following steps: acquiring an initial gray value of a pixel where a first array point coordinate is located under a whiteboard image; obtaining a uniform light compensation difference value corresponding to the initial gray value, interpolating the uniform light compensation difference value into a full-screen compensation difference value by using an interpolation compensation algorithm, and compensating the full-screen compensation difference value to an equal gray value to obtain a full-screen uniform light gray value; obtaining a gray average value of pixels in a central grid where a second matrix point coordinate central matrix point is located under the full-screen uniform light gray value image as a reference gray value; obtaining an average gray value of pixels in a non-central grid where the non-central matrix point is located, and obtaining an optimized compensation difference value between the average gray value and the reference gray value; interpolating the optimization compensation difference value into a full-screen optimization compensation difference value of each pixel of a full screen by using an interpolation compensation algorithm, and compensating the full-screen optimization compensation difference value to the full-screen compensation difference value to obtain a target gray compensation value; and compensating the target gray compensation value to the to-be-printed image data, and loading the to-be-printed image data into an LCD screen for photocuring printing.

The invention discloses a space-based pavement information detection platform multi-sensor synchronous control device and method, and belongs to the field of space-based pavement information detection. The space-based pavement information detection platform multi-sensor synchronous control device includes a micro-controller, a system storage unit, a camera control unit, a level conversion unit, an acousto-optic warning unit, a voltage conditioning unit and a data storage unit, wherein multiple channels of RS-232 communication interfaces are reserved in the level conversion unit; an Ethernet communication interface and multiple channels of UART communication interfaces are reserved in the micro-processor; and a camera shutter interface and a camera synchronous interface are reserved in the camera control unit. The invention also discloses a space-based pavement information detection platform multi-sensor synchronous control method which is implemented based on the above device. The space-based pavement information detection platform multi-sensor synchronous control device and method can realize simultaneous starting and synchronous control of multiple sensors and devices and the data synchronization identity, can furthermore realize synchronous information acquisition at the same time point for the multiple sensors, and have the advantages of high accuracy, high stability, high integrated level and high anti-interference capability.

The embodiment of the invention provides a DNS resolution time delay acquisition method and device. The method comprises the following steps: receiving a domain name resolution instruction of a user,and responding to the domain name resolution instruction; obtaining a to-be-collected target domain name and a DNS server identifier, calling the dig command by taking the target domain name to be acquired and the DNS server identifier as parameters of the dig command respectively to obtain a response result, and when the response result conforms to a preset format, taking a time result in the response result as DNS resolution time delay, the DNS analysis time delay representing the time from initiating domain name analysis by the DNS server to finding an authoritative server capable of providing the target domain name information source IP to be acquired. The probe server simulates a user to surf the Internet; the DNS analysis process of surfing the Internet of the user is recorded, the time from domain name analysis initiated by the DNS server to finding of the authoritative server capable of providing the IP of the target domain name information source to be acquired is taken as theDNS analysis time delay for acquisition, the interference of an access network and part of metropolitan area networks can be eliminated, and the DNS analysis time delay acquisition error is reduced.

The invention discloses a sampling device for spirally propelling soil, and relates to the field of soil collection equipment. The sampling device comprises a fixed base, an L-shaped supporting rod, asupporting table, a connecting rod and a drill bit, wherein first hinges are arranged at the three corners above the fixed base, the L-shaped supporting rod comprises an upper supporting rod, a lowersupporting rod and a first hinged seat, a sliding groove is formed in the upper surface of the upper supporting rod, the first hinged seat is hinged to the first hinge, only second hinges are arranged at the three corners of a regular triangle plate body, a second hinged seat is arranged at one end of the connecting rod, the second hinged seat is hinged with the second hinge, a limiting plate ishinged to the other end of the connecting rod, and the limiting plate is clamped in the sliding groove. According to the invention, through sliding fit between the L-shaped supporting rod and the connecting rod, the rocker is continuously rotated to enable the drill bit fixed in the supporting table to be continuously and vertically pushed into soil along with rotation of the rocker so as to conveniently and smooth perform outdoor soil collection work, and errors are not prone to occurring in vertically-downward collected soil so as to improve the outdoor working efficiency.

The invention relates to a phase switching circuit for transformer ratio measurement, which is mainly composed of filter resistor R1, filter capacitors C1~C3, variable capacitor YM1, voltage transformer PT, A / D converter, high voltage phase switching circuit The relay matrix unit JH, the low-voltage phase switching relay matrix unit JL, the voltage dividing circuit and the transformer T are connected. The structure design of the invention is simple and reasonable, and can simultaneously complete the three-phase transformation ratio measurement of the transformer, which solves the large measurement error caused by the asymmetry of the three-phase voltage, ensures the symmetry of the test power supply, and can improve the transformation ratio measurement accuracy and transformation ratio measurement Work efficiency, suitable for popularization and application.

The invention discloses a vehicle-mounted purification device with voice control and a control system and relates to the technical field of vehicle-mounted purification devices. The vehicle-mounted purification device comprises a purifier body, wherein the control system is arranged in the purifier body and comprises a central processing unit, a memory, an identification unit and a collection unit; one end of the central processing unit is respectively connected with the memory and the identification unit; one end of the collection unit is connected with the identification unit; a voice chip, a wireless chip, a gesture processing chip and a microprocessor are respectively integrated in the central processing unit; one end of the microprocessor is also connected with a recording module and a big data processing module; the memory comprises a voice and corresponding instruction library and a gesture and corresponding instruction library. According to the vehicle-mounted purification device, a 3D gesture collector is used for collecting 3D gestures in a specific space area range; the purifier can be controlled to perform different operations according to different gestures of users, such as horizontally sliding to control opening and closing, and sliding up and down to control power.

The present invention discloses a method for realizing synchronization data acquisition based on a passive optical network. Multiple passive optical networks are in one PON host or multiple PON hosts, through the method of clock sharing or clock synchronization, the synchronization among passive optical networks is realized, and a unified clock counter is ensured between an OLT and an OLT. With a passive optical network as a communication media, based on the cyclical synchronization data acquisition time stamp of an OLT reference clock counter, by using ranging and time delay compensation technology, the synchronization data collection by the ONUs of the passive optical networks at the same time is realized, thus the whole network synchronization data collection is realized, and the method has high time transfer precision. The e synchronization data is transferred to the ONU local processor for processing, or according to different application requirements, a suitable communication protocol is customized, after the protocol is completed, the synchronization data is packaged and is uploaded through a fiber network for processing, and the method has the advantages of reliable transmission and high communication bandwidth.

The invention relates to a current acquisition method for a low-speed section of a permanent magnet synchronous motor of a compressor. The method comprises the following steps: 1) amplifying a current signal; 2) acquiring the amplified current signal; 3) restoring a value of the amplified current signal; and 4) averaging various acquired signals which move to right. The adopted technical proposalcompletely solves the problem of poor current acquisition precision of a 180-degree compressor permanent magnet synchronous motor driver at the low-speed section, can improve an A / D sampling resolution in a cost range and reduce acquisition errors of the current signals at the low-speed section, thus improving the acquisition precision.

The invention relates to a rotating equipment fault monitoring method and system based on big data and a readable storage medium, and the method comprises the steps: setting a sampling interval time,generating multiple groups of sample data of different time nodes, and carrying out the standardization of the multiple groups of sample data, and obtaining standard sample data; obtaining historicalsample data through big data analysis, and establishing a regression model; inputting the standard data into a regression model to obtain a plurality of fault prediction samples; performing similaritycalculation on the plurality of fault prediction samples; classifying the sample data of which the similarity is smaller than a preset threshold value to obtain result information; and performing equipment fault diagnosis through the result information.

A multifunctional automatic spring testing machine, disclosed by the present invention, comprises an upper die, and the upper die comprises a multi-jaw chuck, a motor connected with the multi-jaw chuck and an adjusting cylinder located in the center of the multi-jaw chuck. Each jaw of the multi-jaw chuck is provided with a positioning spring in the radial direction, and the positioning springs extend to the outer wall of the adjusting cylinder. A connecting shaft penetrating through the adjusting cylinder along the radial direction of the clamping jaws is arranged in the positioning spring, one end of the connecting shaft is fixed to the multi-jaw chuck, and a metal gasket with an external thread is arranged at the other end of the connecting shaft and is arranged along the axial directionof the adjusting cylinder. The cross section of the metal gasket is arc-shaped, the end face, close to the multi-jaw chuck, of the metal gasket is coated with a permanent magnet material layer, and the motor works to enable the clamping jaws to drive the multiple metal gaskets to form a circular face so as to position a to-be-tested spring. According to the present invention, the problem that anexisting spring rigidity detection result is large in error is solved. The multifunctional automatic spring testing machine has the advantages of high spring rigidity detection precision, good applicability and the like.

The invention provides a difference sum circuit in a lateral logger, and the circuit is used for an acquisition circuit on the front end of an acquisition system in a lateral logger. The difference sum circuit in a lateral logger comprises a difference sum output end and N input ends, wherein N is an even number larger than or equal to 2. For N signals respectively input from the N input ends, the difference sum circuit obtains the difference of each two signals, and obtains N / 2 signal differences, and performs summation on the N / 2 signal differences, and outputs the obtained sum from the difference sum output end. The difference sum circuit performs subtraction on each two input signals of the plurality of signals, and then performs summation on the differences of each two signals, so as to reduce error of signal acquisition and improve measuring precision of the front end of the acquisition system.