9results about How to "Avoid calibration" patented technology

The invention discloses an automatic calibration method and device based on fine inspection camera edge finding and a storage medium, which are used for improving the calibration efficiency and avoiding artificial errors when a fine inspection camera aligns with a mark point. The method comprises the following steps: obtaining a fixed offset through advanced teaching; according to the fixed offset, the picture center of the fine detection camera falls into a calibration plate through a motion control assembly, and a calibration point is arranged in the calibration plate; the motion control assembly controls the fine detection camera to carry out edge finding motion so as to collect a characteristic pattern of the calibration plate, the linear edge and the angular point of the inner frame of the calibration plate are identified according to the characteristic pattern, and the fine detection camera is guided to carry out edge finding motion and angular point alignment; determining a first mechanical coordinate at the moment; according to the physical parameters of the calibration plate and the first mechanical coordinate, determining a second mechanical coordinate when the picture center of the fine detection camera is aligned with the center of a calibration point on the calibration plate; and calculating an affine transformation relation according to a pre-collected third mechanical coordinate and a pre-collected second mechanical coordinate, and completing calibration.

The invention discloses a vector modulation amplitude-phase rapid calibration method in a complex electromagnetic environment. The method comprises the following steps: S1, establishing a basic amplitude-phase mathematical model and an ideal amplitude-phase mathematical model of a vector modulator; s2, calculating the difference between the basic amplitude-phase mathematical model and the ideal amplitude-phase mathematical model, and establishing an amplitude-phase calibration model of the vector modulator; s3, adopting an optimization algorithm to minimize the value of the amplitude-phase calibration model, obtaining a corresponding optimized ideal amplitude-phase mathematical model, and completing calibration; all amplitude-phase data does not need to be collected, the defect of large voltage error during small voltage collection can be avoided, and the method has the advantages of being high in calibration speed, high in calibration precision, small in calibration workload and the like.

The application discloses a kind of based on double hall sensing's metering device and method, belong to fluid metering technical field.The device includes impeller assembly, double hall sensing module, signal processing unit, main control unit and storage unit;First Hall sensor and second Hall sensor of double hall sensing module are arranged at the outer periphery of impeller rotation track with non-180 degree angle, for detecting the magnetic field change generated by the rotation of permanent magnet on impeller and outputting two-way pulse signal;Main control unit calculates synthetic instantaneous frequency, inquires pre-stored mapping table to obtain compensation coefficient, and dynamically corrects pulse equivalent to calculate flow.This application perceives the micro-dynamic of impeller through double hall, identifies the flow rate distribution distortion caused by water pressure fluctuation, automatically corrects pulse-flow conversion coefficient, without pressure sensor, compresses ±5% error generated by traditional single hall water meter due to pressure change to within ±1%, significantly improves the measurement accuracy.

The invention relates to a non-electric-control medical liquid oxygen two-way decompression tank and a medical central oxygen supply system in the technical field of medical instruments, and aims to solve the problems of electric spark safety risk, low reliability and inconvenience in maintenance in the existing electric control scheme. According to the technical scheme, a pure mechanical structure is adopted, a main air inlet pipeline and a standby air inlet pipeline are included, each air inlet pipeline is provided with a one-way valve and a dual-backup pressure regulating valve set composed of pressure regulating valves connected in parallel, and an outlet of the standby pipeline is connected between a first one-way valve of the main pipeline and the main pressure regulating valve set through a fourth one-way valve; the main path pressure is preset to be higher than the standby path pressure, the one-way valve is driven to be automatically opened and closed through the pressure difference, power-free and seamless switching of the main gas source and the standby gas source is achieved, and the safety valve is arranged to guarantee overpressure safety. The oxygen supply system is mainly used for a hospital center oxygen supply system, and continuous, safe and stable oxygen supply is ensured.

This utility model discloses a two-speed structure for a pure electric transmission and an electric vehicle in the field of electric vehicle transmission technology. It includes a planetary gear train, an input shaft, an intermediate shaft, a one-way clutch, a shift clutch, a first-speed drive gear, a second-speed drive gear, a first-speed driven gear, and a second-speed driven gear. The planetary gear train is connected to the input shaft. The one-way clutch is installed between the input shaft and the first-speed drive gear. The first-speed driven gear and the second-speed driven gear are installed on the intermediate shaft, and the first-speed driven gear meshes with the first-speed drive gear. The shift clutch is installed on the input shaft, and the second-speed drive gear is loosely fitted on the input shaft and connected to the shift clutch. The second-speed driven gear meshes with the second-speed drive gear. This utility model uses a combination of a planetary gear train and a parallel shaft system to achieve a wide range of adjustable speed ratios, broad vehicle adaptability, reduced structural costs, and improved efficiency.

The invention relates to the technical field of semiconductor processing, in particular to a novel chip PAD metal layer removing method, which comprises the following process steps: S1, preparing a chip PAD top layer metal corrosion solution; s2, heating the solution, completely immersing the sample chip, and soaking at a constant temperature to remove top metal of a chip PAD; s3, heating the solution, and completely immersing the sample chip at a constant temperature for 25 minutes; s4, taking out the sample chip, cleaning the sample chip in purified water, and drying the sample chip; s5, preparing a chip PAD secondary top layer metal corrosion solution; s6, the chip PAD secondary top layer metal corrosion solution is heated, the sample chip is completely immersed at the constant temperature for 12 hours, and chip PAD secondary top layer metal is removed; s7, the sample chip is taken out and cleaned; and S8, taking out the sample chip and drying the sample chip to complete the removal of the PAD metal layer of the chip. According to the novel chip PAD metal layer removing method, chip layer removing can be achieved without expensive special equipment, the whole process is easy and convenient to operate, and the consumed time is short.

The utility model discloses a kind of concave surface ultra-thin self-adapting deformation mirror's surface shape detection system, including open liquid storage tank, concave ultra-thin self-adapting deformation mirror, plane fold mirror, optical compensator, optical detection equipment, liftable object table, open liquid storage tank contains liquid, concave ultra-thin self-adapting deformation mirror utilizes its own concave cavity to make mirror body horizontally float in the liquid surface of open liquid storage tank, plane fold mirror is used for the light path fold of concave ultra-thin self-adapting deformation mirror and optical compensator, optical compensator and optical detection equipment are respectively set on liftable object table by supporting adjusting mechanism. The mirror surface support of the utility model is continuous, uniform support, and the high-frequency component in support deformation is small, without local support surface shape difference;The utility model can be adapted to different focal ratio ultra-thin self-adapting mirror, also can be used for gregorian type self-adapting deformation secondary mirror optical detection;The system can avoid tedious precision assembly and adjustment and calibration, shorten detection period, reduce measurement cost.

The embodiment of the invention discloses an IQ channel calibration method of a radio frequency receiver, the radio frequency receiver and electronic equipment, and relates to the field of communication. Excitation signals are generated through the signal generator, and I-path and Q-path digital signals are generated through processing of modules such as the signal selector, the low-noise amplifier, the multiplier, the filter amplifier and the ADC. A notch module is introduced to remove interference of excitation signal frequency, and an interference detection module is used for judging whether obvious external interference exists or not. The IQ amplitude and phase mismatch calibration module determines whether to execute a calibration action according to the interference detection result. If the interference is smaller than the threshold value, amplitude and phase calibration is carried out on the I-path and Q-path alternating current signals; and if the interference is greater than or equal to the threshold value, stopping calibration. According to the scheme, through dynamic configuration and real-time monitoring, the calibration process is ensured to be carried out under the condition of no obvious interference, and the calibration accuracy and the system performance are improved.

The present invention relates to the technical field of electroplating of automobile parts, and specifically to a quantitative adding device for electroplating additives of automobile parts, comprising a base, wherein an upper end of the base is rotatably connected to a fixed shaft at a position close to one side, and an upper end of the base is rotatably connected to a threaded rod at a position close to the other side, and a fixed plate is rotatably connected to the fixed shaft and the outer side of the threaded rod at a position close to the upper end, and a movable plate is arranged together with the fixed shaft and the outer side of the threaded rod, an adsorption mechanism is installed at the upper end of the movable plate, and a feeding mechanism is installed at the lower end of the movable plate, and the feeding mechanism comprises an electric telescopic rod, and an agitating mechanism is installed at the output shaft of the electric telescopic rod, and a spur gear and a spur rack cooperate with each other to rotate a first blade to stir an upper additive to avoid uneven placement of the additive components, and a first bevel gear cooperates with a second bevel gear to stir a lower additive to avoid deposition of the additive to form impurities.