4results about How to "Avoid calibration" patented technology

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.

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.