67results about How to "High linear precision" patented technology

A method and device for automatically assessing loss of hearing sensitivity and compression (recruitment) with user defined frequency resolution by means of extrapolated DPOAE I/O functions and ABRs as well as for automatically fitting hearing aids without any cooperation of the subject tested using a device having a display screen attached to a handheld device generating and collecting otoacoustic emission signals and brain stem response signals into a programmed with a clinical audiogram with fitting parameters for hearing aids calculated on the basis of assessed hearing threshold and compression and identifying the type of hearing required for the individual.

A humidity sensor element, a humidity sensor device and a method for manufacturing thereof are provided. The humidity sensor element includes a substrate having a nanocomposite film as sensing material, wherein said nanocomposite film consists of carbon nanotube/perfluorinated polymer with acid functional groups in weight ratio of 0.01-20; and at least a pair of electrodes, which contact with the sensing material at one or both side(s). The nanocomposite film increases the sensitivity of humidity sensor element such that even an infinitesimal amount of moisture can be detected with minimum detection limit of 15.76 ppm_v

A method and device for automatically assessing loss of hearing sensitivity and compression (recruitment) with user defined frequency resolution by means of extrapolated DPOAE I/O functions and ABRs as well as for automatically fitting hearing aids without any cooperation of the subject tested using a device having a display screen attached to a handheld device generating and collecting otoacoustic emission signals and brain stem response signals into a programmed with a clinical audiogram with fitting parameters for hearing aids calculated on the basis of assessed hearing threshold and compression and identifying the type of hearing required for the individual.

The invention has discloses a piston outer circle diameter comprehensive measuring instrument, which solves problems in the present metering equipment that the precision is not high, the stability is poor and so on, and has the advantages of simple structure, easy to operate, high measuring accuracy. The structure of the instrument is that: a soleplate is provided, two sides of one end of which are provided with a localization block respectively, and which locates and installs a fixed vertical plate, a surveying vertical plate which comprises a big surveying vertical plate and a small surveying vertical plate is arranged to be opposite to the fixed vertical plate, and the surveying vertical plate is connected with an adjuster; a surveying plane plate is arranged between the fixed vertical plate and the surveying vertical plate, gauge head installments are arranged on both the fixed vertical plate and the surveying vertical plate; a sensor frame is installed on the soleplate at one side of the surveying vertical plate, and a dial indicator and a percent meter are installed on the sensor frame; the dial director is sliding fitted with the small surveying vertical plate by the adjuster, that is the same as the percent meter with the big surveying vertical plate, so as to get surveying value.

The invention discloses a process for preparing a kind of gallium nitride nanoline of high purity, which employs gallium oxide (Ga2O3) as raw material, alkaline air (NH3) as reacting gas, inert gas argon gas (Ar) as protective gas, silicon board as base carrier for product growing, absolute ethyl alcohol, acetone and deionized water as cleaning agent for the sicicon board, and employs no accelerating agent; the gallium nitride nanoline grows out under the temperature of 950 Deg C and on the silicon board through ammonification reaction; the preparing process is simplified by grinding, sifting the raw material, cleaning the silicon board and quartz material, controlling the air extraction, argon gas and alkaline air inputting by tubing high temperature furnace control device procedurally, which prevents the side product generating effectively and increases the product outcome, purity and quality and finally getting the gallium nitride nanoline of light yellow, solid and in linary shape; the product is characterized by the uniform shape, order arrangement, and stable optical, chemical and physical property; the invention is characterized by the short preparing process, high yield (reaching to 95%), high purity (reaching to 98.6%) and the high linary accuracy, with the diameter being 5-20 cm, the average length of the monoline 30-50 ª–m.

The invention belongs to the technical field of galvanic corrosion measurement for metal materials, in particular relates to a multi-channel galvanic corrosion measurement device. According to the multi-channel galvanic corrosion measurement device, an SOC (System on a Chip) processor structural design is adopted; the front end of an electrode connection cable is connected with an electrode; the rear end of the electrode connection cable is connected into a voltage/current measurement switching unit; two ends of a front end signal conditioning circuit are bridged with a reference source afterbeing electrically communicated with an A/D (Analog-to-Digital) conversion circuit; the front end of the front end signal conditioning circuit is electrically connected with the voltage/current measurement switching unit; the output end of the A/D conversion circuit is electrically communicated with a main control module after being connected in series with a multi-channel electric isolation unit; an SOC processor is arranged in the main control module; the main control module is electrically connected with a display module, a storage module and a communication module respectively, so that electric information control is realized; and a signal input by a reference electrode is incorporated into the front end signal conditioning circuit after being amplified, so that a signal processing system is formed. The multi-channel galvanic corrosion measurement device has the characteristics of simple overall structure, reliable principle, convenience for use and operation, accuracy in measurement data, flexibility for control and wide application range.

An apparatus and method for calibrating a ramp slope value of a ramp signal to increase the accuracy of the slope of the ramp signal used within CMOS image sensors. An image sensor includes an active pixel sensor (APS) array, a ramp signal generator and an analog-to-digital converter (ADC). The APS array is configured to generate a reset signal and an image signal for a pixel of a selected row of the APS array. The ramp signal generator is configured to generate a ramp signal, a ramp slope value of the ramp signal being adjusted based on a slope control signal. The ADC is configured to generate a digital code based on the ramp signal and a difference between the reset signal and the image signal.

The invention discloses a pushing system and method for a PLC multipoint synchronous three-dimensional hydraulic bridge. The pushing system comprises a pushing monitoring system and multiple groups ofwalking-type three-dimensional hydraulic pushing devices for pushing pushed steel box beams, and each pushing buttress is provided with a left temporary supporting base and a right temporary supporting base which are symmetrically distributed. The pushing method includes the steps of 1, constructing assembly jig frames and temporary buttresses; 2, constructing a three-dimensional adjusting device, the pushing devices and the temporary supporting bases; 3, carrying out steel-box-beam assembling and synchronous pushing; 4, carrying out steel-box-beam pushing. According to the pushing system andmethod for the PLC multipoint synchronous three-dimensional hydraulic bridge, steel box beams are synchronously pushed forwards multiple times through the multiple groups of walking-type three-dimensional hydraulic pushing devices, pushing controlling is easy and convenient, synchronous action of the multiple groups of walking-type three-dimensional hydraulic pushing devices can be easily and conveniently achieved, pushing positions are flexibly distributed, guide beams and sliding rail beams for longitudinal pushing are not required, self-balancing pushing is really achieved, and the pushingprocess is safe and reliable.

The invention discloses an intelligent differential transformer-type static and dynamic displacement transducer and a displacement measuring method thereof. The intelligent differential transformer-type static and dynamic displacement transducer comprises a voltage/current measuring unit, a temperature measuring unit, a processing unit and a memory unit, wherein the voltage/current measuring unit comprises a differential transformer and a voltage/current processing module; the processing unit comprises a processor, a displacement value computing module, a temperature compensating module and a number identifying module; the cross sections of a secondary coil a (2) and a secondary coil b (3) are stepped; the secondary coil a (2) and the secondary coil b (3) are horizontally wound incrementally from the central line of a coil cavity (8) to two ends respectively; and the memory unit at least stores an equipment number, a calibrating linear coefficient and a temperature compensating coefficient. The intelligent differential transformer-type static and dynamic displacement transducer and the displacement measuring method thereof have the advantages that a target displacement value can be directly output; the linear precision of the differential transformer is high; a host machine can operate and control a transducer with a specified number; and the transducer can work independently without the control of the host computer.

The invention discloses a steel box girder incremental launching construction method based on walking type three-dimensional hydraulic incremental launching equipment. The two ends of a construction steel box girder are each supported on a girder end pier, and the construction steel box girder is divided into a first girder body and a second girder body with a midspan pier being the boundary; incremental launching construction includes the steps that 1, temporary piers and midspan temporary piers are constructed; 2, incremental launching is conducted on the girder bodies synchronously throughthe walking type three-dimensional hydraulic incremental launching equipment; 3, midspan closing is conducted. The walking type three-dimensional hydraulic incremental launching equipment is adopted for conducting incremental launching on the two girder bodies synchronously until the two girder bodies of the constructed steel box girder are closed from two sides to the midspand; incremental launching of the walking type three-dimensional hydraulic incremental launching equipment is easy and convenient to control, multiple sets of walking type three-dimensional hydraulic incremental launching equipment can easily and conveniently act synchronously, incremental launching positions are arranged flexibility, a guide beam and a slideway beam used for longitudinal incremental launching are not needed, self-balance incremental launching is really realized, and the process of incremental launching is safe and reliable.

The invention discloses a paper core technology. The technology has the advantages that step one, the outer side of a paper core bottom tube is coated with a layer of glue; step two, negative pressureattraction is conducted on the outer circumference of an elastic sleeve tube to allow the inner diameter of the elastic sleeve tube to be in a constant enlarging state; step three, the elastic sleevetube sleeves the paper core bottom tube along the axis; step four, the negative pressure at the outer circumference of the elastic sleeve tube is released to allow the inner diameter of the elastic sleeve tube to start retraction, and therefore the inner wall of the elastic sleeve tube is retracted to fit the outer wall of the paper core bottom tube. The technology has the advantages that an elastic sleeve tube structure is adopted, the linear precision of a paper core winding face can be effectively increased by the elastic sleeve tube, a certain shaping effect on the spirally wound paper core bottom tube is achieved by the elastic sleeve tube, and the combining strength, and the flatness and linearity of the paper core are enhanced by the elastic sleeve tube through the cooperation of abinding agent and a spiral structure of the paper core sleeve tube.

The invention provides a detection circuit suitable for the on-line temperature of a high-voltage solid-state soft starter, belonging to the technical field of the starting of a high-voltage motor, and mainly aiming at solving the problem that the existing temperature protection technology only sets the every-time starting time interval to realize the temperature protection of a thyristor and can not meet the field demand. The circuit is mainly characterized by comprising a high voltage-side detection circuit which is formed by the means that a temperature signal acquisition circuit, a voltage amplifier circuit, a voltage/frequency switching circuit and an optic fiber transmitting circuit are sequentially connected with one another, and a low voltage-side switching circuit which is formed by the means that an optic fiber receiving circuit and a frequency/voltage switching circuit are sequentially connected with each other; and the optic fiber transmitting circuit in the high voltage-side detection circuit is connected with the optic fiber receiving circuit of the low voltage-side switching circuit by an optic fiber. The detection circuit is higher in cost performance, a V/F (voltage/frequency) optic fiber transmission system of the detection circuit has the characteristics of being long in distance, anti-jamming, high in linear precision, good in performance and the like, and the detection circuit is mainly used for the on-line temperature of the thyristor in high-voltage starter starting equipment.

A horizontal gas-gas two phase composite beeline benchmark method and a device based on the gravity balance belong to the technical field of precision instruments and measurement. The method comprises the steps: a balance slideway is constructed below of an orientation slideway, which forms an open external gas support and acts on an anti-thrust plate in the lower part of a flotation guide cover, the gravity balance of the orientation slideway and the balance slideway is designed aiming at the load gravity, under the conditions of satisfying the load gravity of the balance slideway, and the gas film supporting stiffness arrives the maximum or is in the confirmed range of the gas film supporting stiffness; the device comprises the anti-thrust plate fixedly connected with lower part of the flotation guide cover, an anti-thrust flotation dual surface is formed between the anti-thrust plate and the balance slideway, the anti-thrust plate is provided with a throttle structure facing to the balance slideway which is parallel to the orientation slideway. The invention leads the flotation guide cover to have excellent stability, the slideway load capability and the supporting stiffness are greatly improved, the high linear accuracy of the slideway under big load and big stroke is ensured, the structure is simple, and the application scope is wide.

The invention relates to a productive technology of a high-precision and high-rigidity prestressed centrifugal steel mould, comprising the following procedures: the material is fed according to standard requirements; the upper top surface of a longitudinal rib plate is impacted by an impactor strongly; processed parts are assembled into a steel mould finished product according to assembly standard requirements; the steel mould straightness of the assembled steel mould is measured by a way of two-ends support-moment runout; being near the protruding-direction position of the bent position of the measured steel mould, a welding line between the longitudinal rib plate and a steel mould cylinder, and a welding line between the cross position and the steel mould cylinder are repeatedly welded and straightened until the steel mould reaches the requirements, wherein the cross position is between the longitudinal rib plate and a toroidal rib plate. The steel mould produced by the productive technology reduces the plastic deformation of the steel mould finished product, improves the precision and the rigidity of the steel mould and prolongs the service life of the steel mould.

The invention relates to a sinusoidal electric quantity signal conversion and acquisition device which comprises a signal extraction module, a peak value sampling module (PKD01) and an analog-to-digital conversion computing module, wherein the signal extraction module extracts sinusoidal electric quantity signals to transmit to the peak value sampling module, and the peak value sampling module outputs the sinusoidal electric quantity signals when the sinusoidal electric quantity signals reach the peak value and transmits the sinusoidal electric quantity signals to the analog-to-digital conversion computing module to be converted into digital signals for being computed. Because 2 signal following and amplification to 3 signal rectification to 4 signal amplification to 5 signal filtration in the traditional electric quantity signal acquisition circuit is replaced by the peak value sampling module consisting of the PDK01, the invention reduces a plurality of complex analog circuits, avoids the influence of factors of supplied materials, environment and the like, and has the advantages of rapid response speed, wide transmission bands, good linearity, high linearity precision of peak value, and the like.

The invention relates to a line type verifying method of a steel structure. The method comprises the following steps that 1, in the modeling process of the steel structure, at least one straight linesection is designed on a steel structure model in advance, and two end points of each straight line section are recorded; 2, in the blanking process, the straight line sections are manufactured on thesurface of the steel structure in a sprayed manner; and 3, after blanking is completed, a pull line is placed between the two end points and pulled straightly, the pull line and the straight line section corresponding to the two end points are compared, and verifying of the line type of the steel structure is completed, wherein when the pull line and the straight line section coincide, the line type of the steel structure is unchanged, and when the pull line and the straight line section deviate, the line type of the steel structure changes. According to the line type verifying method and line type correction method of the steel structure, the line type of the steel structure such as a T-shaped profile web or slab deforming easily can be verified and corrected conveniently.

The invention is applied to the field of machining of deep holes of medium and small diameters (below), and particularly relates to a gun drill for deep hole machining based on piezoelectric ceramic materials for deviation measurement and correction and a corresponding deviation measurement and correction method. The piezoelectric gun drill comprises a piezoelectric drill bit and a piezoelectric drill rod. Two long-strip-shaped tile-shaped piezoelectric ceramics are installed at the front end of the piezoelectric drill rod at a circumferential angle difference of 90 degrees, the tile-shaped piezoelectric ceramics are used for detecting voltage changes caused by axial stress generated when the drill rod is bent due to axis deflection so as to judge the direction and the size of axis deflection. An arc-shaped solid body is welded to the piezoelectric drill bit, three cylindrical grooves are machined in the circumferential direction, cylindrical piezoelectric ceramics are installed in thethree cylindrical grooves, hard alloy protective layers adhere to the upper surfaces of the cylindrical piezoelectric ceramics and are in interference fit with hole walls, and the cylindrical piezoelectric ceramics deform in the radial direction by applying an external voltage signal and extrude the machined hole walls to push back the deflected drill bit to the correct position. Through dynamiccombination of online deviation measurement and real-time deviation correction, the straightness of the deep holes of medium and small diameters is improved.

The invention discloses a two-degree-of-freedom driver with both rotation and linear motion and a control method thereof, and belongs to the technical field of precision machining. The two-degree-of-freedom driver comprises a rear end cover, a stator, a rotor and a coil winding, wherein the rear end cover is of a disc-shaped structure, uniformly provided with 6 through holes at the periphery and fixed on the stator by screws, the center of the disc is provided with a through hole which is used for placing a rolling bearing, the stator is uniformly provided with 6 convex strips along the innercircumference, the stator is uniformly provided with 6 threaded holes on one end face and connected with the rear end cover by screws, the convex strips are provided with grooves at the end close to the threaded holes, there is a stator threading hole near the grooves, the coil winding is wound on 6 bosses of the stator and extracted through the stator threading hole, and the rotor is installed onthe rear end cover through a bearing. The rotation speed of the rotor is controlled through regulating the size of current introducing into the coil winding and the electrification interval time, andthe linear motion displacement of the driver is controlled through regulating the size of current introducing into a solenoid coil inside the rotor, thereby being capable of simultaneously realizingrotation and linear motion.

The invention discloses a CCD visual positioning feeder for 3C stamped sheets. The CCD visual positioning feeder comprises a belt conveyor, wherein an online position detection sensor is arranged at the front end of the belt conveyor, a main portal is installed in the middle of the belt conveyor, a circumferential adjusting part is installed on the main portal, an extending arm is fixed to the front end of the circumferential adjusting part through a sliding rail sliding block, a CCD vision camera is fixed to a front end plate of the extending arm, a rectangular light source is arranged belowthe CCD vision camera, a limiting lug block is installed on one side face of the sliding block, and an oil pressure buffer is arranged under the limiting lug block. The feeder has the effects that a feeding position degree is high, no defective product enters production, and a CCD vision camera detection position is convenient and flexible to adjust.