44results about How to "Reduce hysteresis error" patented technology

The invention discloses a metal-encapsulated fiber Bragg grating sensor and a manufacturing method thereof. By encapsulating the fiber Bragg grating in a steel pipe through a specific manufacturing method, the sensor of the invention improves the strain sensitivity compared with the prior art, and Easy to install.

The invention relates to a method for reducing the hysteresis error of out-precipitated martensitic stainless steel elastomer. The method comprises the following: a step of performing solid solution, which is to heat a bar with a furnace at a speed between 5 and 30 DEG C per minute, heat the bar to 1,040+/-10 DEG C, preserve heat for 1 to 4 hours and compulsively cool the bar to room temperature; a step of deep cooling, which is to cool the compulsively cooled bar in liquid nitrogen at a cooling temperature between 70 and 90 DEG C below zero for 2.5 to 6 hours; a step of performing deformation processing, which is to stretch or compress the deep cooled bar at a speed less than or equal to 5 millimeters per second at normal temperature and control the elongation or compression ratio of the bar in the stretching/compressing direction between 1.0 and 5.0 percent; a step of aging, which is to put the deformed bar into a heating furnace at a temperature not higher than 200 DEG C, heat the bar with the furnace at a speed between 5 and 30 DEG C per minute, raise the temperature to 480+/-5 DEG C and preserve the heat for 2.5 to 5 hours. The method improves the capability of out-precipitated martensitic stainless steel in resisting micro-region plastic deformation, and reduces the hysteresis error of weighting sensors.

The invention discloses a radiation shield for meteorological measurement, and belongs to the technical field of a meteorological instrument, for solving the technical problem of providing a radiation shield for meteorological measurement, capable of reducing sensor radiation errors and lag errors. The radiation shield comprises at least three guide tubes, the two ends of each guide tube is provided with an opening, each guide tube is internally at least provided with a temperature sensor probe, at least one guide tube has relative good ventilation whatever wind directions the radiation shield is disposed at, and thus solar radiation errors and lag errors of the temperature sensor probe can be reduced. Even if one guide tube is damaged, other guide tubes can still work normally, the whole radiation shield is little affected, and the reliability is quite good.

The invention discloses a method for improving the mutual guiding precision of multiple photoelectric theodolites working together. For the requirement of high-precision guiding, the problem of the insufficient mutual guiding precision of the multiple photoelectric theodolites currently working together is solved. When the multiple photoelectric theodolites track the same target at the same time,one theodolite firstly captures the target and stabilizes the tracking target, then the theodolite emits a signal to guide other photoelectric theodolites to enter a tracking state, the factors affecting the guiding accuracy mainly include a site error, a pointing error and a dynamic hysteresis error. In order to suppress the errors, target trajectory data is transformed to coordinates of a station center tangent plane of a guided theodolite through synchronous star capture and calibration, the guided theodolite firstly moves along a predicted target trajectory, and then the mutual guidance accuracy is improved by the fine adjustment of a frame position, deviation amount feedforward control and other methods after receiving a deviation amount.

The present disclosure provides a magnetic medium, a magnetic encoder, and a method for manufacturing a magnetic medium with high reliability that can obtain the sufficient signal output, while reducing the hysteresis error.

Disclosed is a magnetic medium relatively movable with respect to a magnetic sensor for detecting a magnetic field in a magnetosensitive face, the magnetic medium including: a signal magnetization region including a first magnetization region magnetized in a first direction being in parallel with the magnetosensitive face and a second magnetization region magnetized in a second direction opposed to the first direction, the first magnetization region and the second magnetization region being alternately arranged along the first direction or the second direction; and

• • a bias magnetization region magnetized in a third direction, the third direction intersecting both the first and second directions, and being in parallel with the magnetosensitive face, wherein
  • while a surface of the magnetic medium opposed to the magnetic sensor is placed to face upward,
  • the bias magnetization region is formed under the first magnetization region and the second magnetization region near an interface between the first magnetization region and the second magnetization region, and no bias magnetization regions are formed under the first magnetization region near a center of the first magnetization region and under the second magnetization region near a center of the second magnetization region.

The invention discloses a signal frequency measuring method based on a period tracking method and a mobile integer period method. The signal frequency measuring method comprises the specific steps that first, the timer frequency f[clk] and an allowed measuring error epsilon are set; second, if the upper limit f[max] of a measured signal frequency f is unknown, the mobile integer period method is used for measuring the signal frequency, and if the upper limit f[max] of a measured signal frequency f is known, whether the f[max], the f[clk] and the epsilon meet the relational expression that f[max] is smaller than f[clk]*epsilon is judged, if yes, the period tracking method is used for measuring the signal frequency, and if not, the mobile integer period method is used for measuring the signal frequency. The period tracking method can update the measuring result in time when detecting the situation that the signal period is prolonged, and the mobile integer period method achieves the effect that the measuring result is updated at least one time in each signal period. The period tracking method and the mobile integer period method can track the changing process of the signal frequency faster, the hysteresis error is reduced, the requested number of timers is not increased, the calculation amount is small, only a small amount of memory variable needs to be added, and therefore the hardware cost of a frequency testing device cannot be increased.

The invention provides an anti-hysteresis method and device for piezoelectric ceramics, equipment and a medium, and the method comprises the steps: S1, building a linear equation UR-shiji of a risingtrack curve and a linear equation UF-shiji of a falling track curve according to the linear relation between a sampling point (x, y) of a hysteresis model curve and a corresponding target correction voltage U target; and S2, finally, respectively inputting the coordinates of the sampling point (x, y) into the linear equation UR-shiji of the rising track curve and the linear equation UF-shiji of the falling track curve to obtain a final actual correction voltage UM-shiji, and actually inputting the actual correction voltage UM-shiji into a piezoelectric ceramic driver to draw a corrected driving control curve. Through the two linear equations, the anti-hysteresis method and device are higher in feasibility and operability, and provide a scientific reference basis for the further improvementof the positioning and control precision of the piezoelectric ceramic driver.

An angle sensor for leg angle measurement is disclosed and belongs to the field of an angle sensor. The angle sensor includes a first circuit board for generating a first angle signal and a first temperature signal at the thigh and transmitting the first angle signal and the first temperature signal to the single chip microcomputer, a second circuit board for generating a second angle signal and asecond temperature signal at the lower leg and transmitting the second angle signal and the second temperature signal to a single chip microcomputer, and the single chip microcomputer for processingthe first angle signal, the second angle signal, the first temperature signal and the second temperature signal to obtain a final angle value of the single chip microcomputer. It solves the problems of inaccurate observation of angle change of leg shape by naked eyes, interference of ambient temperature and strong magnetic field in leg shape correction, dance training and rehabilitation treatment,and can be used in leg shape correction, dance training and rehabilitation treatment.

The invention provides an intelligent control system which comprises a monitoring and diagnosing controller and a boiler. The boiler comprises a blowdown pipe arranged at the lower end of a boiler steam pocket, a blowdown valve is arranged on the blowdown pipe, one end of the blowdown valve is connected with a valve adjusting device, the valve adjusting device is in data connection with the monitoring and diagnosing controller, and therefore valve aperture data can be transmitted to the monitoring and diagnosing controller; meanwhile, a command is received from the monitoring and diagnosing controller, and the aperture of the blowdown valve is adjusted; the steam pocket further comprises a water quality analyzer which comprises a PH value testing unit so as to measure the PH value of water in the steam pocket, and the water quality analyzer is in data conenction with the monitoring and diagnosing controller, and therefore measured PH data are conveniently received; and the boiler is subject to blowdown, the blowdown time and blowdown speed are automatically set by the central monitoring and diagnosing controller according to the measured PH value, and therefore the blowdown amount is automatically controlled. According to the intelligent control system, the blowdown amount is automatically calculated; and compared with the prior art, the hysteretic nature caused by automatic control in the prior art is reduced, and the optimal blowdown control can be achieved.

The invention provides a contact mode micro accelerometer which comprises a lower substrate and an upper substrate. A supporting column, a thin plate, a plurality of supporting beams and anchor pointsof the beams are arranged between the lower substrate and the upper substrate. The lower substrate and the upper substrate are provided with lower and upper fixed electrodes. The surfaces of the fixed electrodes are covered with insulating layers. The upper and lower surfaces of the thin plate are provided with upper and lower moving electrodes. The micro accelerometer has a first working state in which the thin plate and the moving electrodes are deformed by force but are not in contact with the insulating layer and a second working state in which the thin plate and the moving electrodes aredeformed by force and are in contact with the insulating layers. According to the contact mode micro accelerometer, a principle that the accelerometer causes the deformation of the moving electrodesand thus the capacitance between the fixed electrodes is changed is used to work. Through the insulating layers on the fixed electrodes, the short circuit of the moving and fixed electrodes is prevented, the insulating layers provide support for a movable structure, thus the measurement of the high acceleration can be realized, and the capacitance saturation of the sensor can be effectively suppressed by a combined structure of the beams and the round thin plate.

The invention provides an intelligently-controlled boiler system. The system is controlled automatically according to the steam quantity generated by boilers and the water quantity input into the boilers, the boilers are subjected to regular sewage discharging, the sewage discharging speed maintains unchanged, a central diagnosis monitor sets the sewage discharging time automatically according to the specific value between the steam mass and the mass of the water input into the boilers, and thus the discharge capacity is controlled automatically. The input water quantity and the generated steam quantity of each boiler are monitored in real time, the dynamic ratio relation between the input water quantity and the generated steam quantity is obtained, the discharge capacity of the boilers is calculated automatically according to the dynamic proportion relation, and the sewage discharging time is adjusted according to the discharge capacity. Compared with the prior art, hysteresis quality is reduced due to the fact that the sewage discharging time is calculated automatically, and the optimal sewage discharging control can be achieved.