41results about How to "Small linear error" patented technology

The invention discloses a sputtering thin film temperature-pressure composite sensor and a manufacturing method thereof, which can measure temperature and pressure of a high-low-temperature gaseous or liquid medium. The sputtering thin film temperature-pressure composite sensor comprises a joint, a sensitive element, copper columns, a compensating plate, gold lead wires, sleeves, a signal processing circuit board, an outer shell, lead wires, fastening screws, an aviation socket and a socket base, wherein four thin-film resistors used for measuring pressure are processed on the sensitive element by adopting a sputtering thin film technology, and two thin-film resistors used for measuring temperature are further processed in a tiny deformation region on the periphery of the pressure-measuring thin-film resistors; the four pressure-measuring thin-film resistors are connected with the compensating plate in a switch-over manner and are bridged by means of the gold lead wires, the two temperature-measuring thin-film resistors lead out four of the gold lead wires to be switched into lead wires by means of the compensating plate and connected to the signal processing circuit board, and bridge forming and compensation are completed on the signal processing circuit board. The sputtering thin film temperature-pressure composite sensor is based on the original sputtering thin film temperature-pressure composite sensor manufacturing process, and hardly increases any production and application cost.

The invention discloses a self-shielding gradient coil of a nuclear magnetic resonance spectrometer and a design method thereof. The invention is characterized in that, the self-shielding gradient coil comprises a main coil and a shielding coil which is coaxially arranged on the outer side of the main coil. The windings of the main coil are composed of a plurality of stages of main coil upper windings and main coil lower windings which are symmetrically arranged up and down. The centers of winding wire troughs, the circle radiuses of winding coils and turns per coil, corresponding to the maincoil upper windings and the main coil lower windings, are symmetrically arranged up and down in the one-to-one mode. The windings of the main coil are wound in the winding wire troughs and are arranged in a single-layer winding mode in the axial direction. Each stage of main coil winding corresponds to an independent driving current channel. According to the self-shielding gradient coil and the design method thereof, the series single-channel circuit design is changed into the matrix multi-channel circuit design, and the coil structure is simplified. The optimization difficulty of a target field is reduced. The probability that the actually generated gradient field is deformed and the linearity is not pure due to the winding translation and the interlayer dislocation is reduced.

The invention discloses a gradient coil for a nuclear magnetic resonance spectrometer, and the gradient coil consists of main coils and shielding coils, wherein the shielding coils are coaxially disposed at an outer side of the main coils. The main coils are a plurality of groups of coil windings which are symmetrically distributed at the upper and lower parts in the axial direction of the coil. The upper two groups of coils and the lower two groups of coils are in opposite winding directions. The shielding coils are two groups of coil windings which are symmetrically distributed at the upper and lower parts and are in opposite winding direction. All the winding coils are in series connection. An interval from 4.3 mm to 5.3 mm is kept between the shielding coils and the main coils, and the interior of the main coils is provided with a thermal isolation part. According to the invention, the coil remarkably improves the coil efficiency, and a gradient magnetic field can be obtained through the simple algorithm and technology, wherein the intensity of the gradient magnetic field is greater than 50 Gs/cm@10A, and the linear error is less than 0.5 Gs/cm@10A. Moreover, the coil can guarantee the stability of a gradient field in a variable temperature experiment.

The invention provides a magnetic navigation sensor system and a control method thereof. The magnetic navigation sensor system is characterized by comprising connected signal acquisition modules and amicrocomputer, wherein the signal acquisition module comprises a 16 channel signal acquisition unit; each channel of the signal acquisition unit comprises connected Hall sensors and an amplificationcircuit; the 16 channel Hall sensors are located on the same plane and are arranged in a straight line and face the ground; each Hall sensor, the amplifying circuit and the microcomputer are separately powered by power supply modules; the Hall sensor is connected with a temperature compensation circuit; the microcomputer comprises a digital-to-analog converter and an analog-to-digital converter; and the microcomputer is connected with a key input device and a display screen, and is connected with a AGV main controller through a serial port and/or a CAN bus. The temperature compensation methodadopted by the invention has a simple structure and a good effect, the amplification circuit is superior in performance, and the problems such as temperature drift and noise interference are well solved by means of calculation and weight filter of voltage difference values.

The invention relates to a ship pipeline vibration emergency processing system. The ship pipeline vibration emergency processing system comprises a data collecting card, a miniature processor, a sensor set, a steering engine and a motor driver. The data collecting card is connected with the miniature processor, the miniature processor is connected with the steering engine and the motor driver, thesteering engine is connected with a pipeline valve, and the motor driver is connected with a fastening frame. The sensor set comprises a vibration sensor, an acceleration sensor and a displacement sensor which are arranged on the outer side of a to-be-tested pipeline. The vibration sensor, the acceleration sensor and the displacement sensor are connected with the data collecting card so as to send collected pipeline vibration signals to the data collecting card. The miniature processor is connected with an upper computer. The ship pipeline vibration emergency processing system is simple in principle and high in intelligent degree, and can conduct collecting, storing and analysis on the pipeline vibration signals, when an abnormal signal is detected, emergency processing on abnormal vibration of the ship pipeline can be achieved automatically by controlling the steering engine and the motor driver, and thus the ship pipeline vibration emergency processing system has certain monitoringand emergency processing effects on the failures similar to pipeline breaking, leaking and the like.

The invention discloses a novel integrated alternating current servo techogenerator set. The novel integrated alternating current servo techogenerator set comprises a rotating shaft, a copper sleeve, an inner stator iron core, permanent magnet steel, a Hall element, an unslotted rotor, a magnetism isolating pillowcase, an outer stator iron core, an exciting winding, a chassis, an end cover and a matched bearing. The rotating shaft penetrates through the unslotted rotor, a center hole of the copper sleeve and the bearing and is fixed by virtue of the end cover and the chassis; the inner stator iron core is fixed with the end cover by virtue of the copper sleeve, the permanent magnet steel and the Hall element are embedded into a groove of the inner stator iron core; the outer stator iron core is fixed with the chassis, and the exciting winding is embedded into a winding slot of the outer stator iron core; an unslotted rotor cup body is arranged in a gap between the inner stator iron core and the outer stator iron core; the unslotted rotor comprises an iron core, an inner-layer short circuit winding and an outer-layer short circuit winding; and the iron core is divided into an inner layer and an outer layer by the magnetism isolating pillowcase. The novel alternating current servo techogenerator set has the advantages that the motor and a speed detector share the same rotor, structure is compact, volume is small, operation is stable, an electrical signal corresponding to angular velocity of the set can be directly output, linear error is small, and no residual voltage is produced.

The invention provides a high-precision, linear and low-noise bipolar direct current voltage source. The voltage source comprises a power source converting module, a two-stage buffering voltage stabilization input module, a central control unit, a high-precision digitized voltage converting unit, an LCD display unit, an upper computer program, an operation panel and a temperature control output unit. Two-stage buffering voltage stabilization input is applied, system noise is reduced through digital-analog partitioning isolation area designing, a temperature control technology is used for improving stability of system output, a high-precision digitalized technology is used for restraining noise of voltage output, and the problems that in current radiation detection research, linear precision of an existing direct current voltage source is not high, and noise influences are great are solved. Drive capacity is high, precision reaches 20 bits, the resolution ratio is 1ppm, a linear error is smaller than 1ppm, the highest signal frequency is 10kHz, and zero level output voltage noise is smaller than 20 microvolt ( smaller than 1LSB).

The invention provides a wide viscosity type liquid turbine flow sensor which comprises a shell and an impeller, a plurality of blades are evenly distributed on a hub of the impeller, the blades are spirally arranged on the hub of the impeller, and the blades on the impeller are distributed in the axial direction of the impeller as follows: the tail end of the previous blade is connected with thestarting end of the next blade. in terms of the axial direction of the impeller, the joint part of two adjacent blades has no gap and no overlap, and a closed circular ring is just formed. The lengthof the impeller is designed according to the speed profile of the maximum viscosity point, the blade compactness of the impeller is increased through the length design of the impeller, the leakage amount, increased along with the increase of viscosity, between blades is reduced, then the driving torque of fluid to the impeller is increased, so that the stable performance can be kept when wide-viscosity liquid is measured. Therefore, the performance of the turbine flow sensor is improved.

The invention discloses an automatic calibration programmable instrumentation amplifier for sensor signal processing. A multiplexer T1, a multiplexer T2, a multiplexer T3, a multiplexer T4, an automatic calibration amplifier A1, an automatic calibration amplifier A2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an instrument amplifier A3, an output amplifier A4, an output amplifier A5, an AB-class amplifier A6, an AB-class amplifier A7 and an amplifier A8 are matched and connected with one another, so that the sensitivity of the sensor can be effectively improved; and the non-ideal characteristic of the sensor and the imbalance, range and drift of the sensor are eliminated, the instrumentation amplifier which is capable of automatic calibration, low in noise, low in linear error, low in imbalance drift and programmable in gain is manufactured, the use effect of the sensor signal processing automatic calibration programmable instrumentation amplifier is better, and the user experience feeling is better.