48results about How to "High repeatable measurement accuracy" patented technology

The invention discloses a large free forging size online measurement device and method. The device is provided with, on two sides of a forging machine, a horizontal and a vertical motion unit, a laser cast-line method length measuring unit, a temperature-measurement edge searching method diameter online temperature measurement unit, a laser correlation telemetry diameter online measurement unit, a laser correlation telemetry diameter offline measurement unit, a laser beam cast-line method diameter visual inspection and early warning unit, and an operating machine position measurement unit installed on the operating machine. Each measurement unit is installed on the horizontal or the vertical motion unit, and is capable of horizontal or vertical motion. The projection laser beam method, the infrared temperature-measurement edge searching method and the laser correlation telemetry are used in the method to obtain the forging diameter, length, size and the forging contour in a horizontal section. The device and the method achieve online and offline measurement for the forging, enhance measurement functions and improve timeliness, accuracy and efficiency of the measurement.

Disclosed is a symmetric-type grating heterodyne interference secondary diffraction measuring device. The device mainly comprises a laser device, a 1 / 4 wave plate, a light splitting system, a photoelectric conversion system, a polarizing light splitter, a reflector, a grating and the like. Double-frequency lasers emitted by the laser device enter the light splitting system after passing the 1 / 4 wave plate to be divided into three branches, one branch enters the reference photoelectric conversion system, the other two branches enter the positive-negative measuring light path polarizing light splitter, reflected light s is irradiated onto the grating by an incident angle set according to corresponding diffraction grades, occurs interference with light p on a polarizing light splitting face after secondary diffraction and enters the measuring light path photoelectric conversion system. When the grating moves, two signals containing displacement information are detected by the measuring light path photoelectric conversion system, and grading level and vertical displacement can be acquired by solving through the two signals. Whether measured light can return along an original path after secondary diffraction or not only depends on the incident angle and has nothing to do with grating displacement, so that the symmetric-type grating heterodyne interference secondary diffraction measuring device can realize horizontal long stroke and vertical displacement measuring.

The invention discloses a dual-frequency grating measuring device, which comprises a light source module, a grating, a first detector, a second detector and a grating measuring probe, wherein the light source module is used for generating two light beams with different frequencies; and the grating measuring probe is connected with the light source module and the detectors, the grating measuring probe receives the two light beams from the light source module and performs light splitting on the two light beams, one part of two light beams is enabled to parallelly shoot to the grating and be transmitted to the first detector after being subjected to diffraction of the grating, and the other part is transmitted to the second detector. The dual-frequency grating measuring device has the characteristics of high anti-interference ability, high measurement precision, high repeated measurement precision, ability of being free of nonlinear error influences, simple structure and convenient installation and use, and is extremely applicable to the field of picometer precision two-dimensional measurement with high stability requirements.

A new type of gel film capacitive sensor and method for measuring the occlusal force of a single pair of teeth. The sensor includes an insulating medium. The upper and lower surfaces of the insulating medium are each pasted with a layer of ion gel as an electrolyte. Both substances are soft and transparent A capacitor that can change with pressure is formed, and a layer of insulating medium is pasted on the upper and lower surfaces to avoid the influence of external parasitic capacitance on the measurement results; the lead wires of the metal electrodes are connected to the acquisition card to form an ion-electronic mixed current circuit. Capacitance signal, through data calculation to obtain the change data of the occlusal force of a single pair of teeth with time; the capacitive sensor uses a new type of gel material to ensure accurate measurement of the occlusal force of the teeth under the condition of restoring the occlusion of the teeth as much as possible, and the material has good repeatability Accuracy, low cost, easy processing, one-time use, clean and hygienic, and high transparency allow the sensor to observe changes in teeth while transmitting electrical signals.

The invention relates to a method for measuring the outer circumference and maximum and minimum diameters of a cylindrical workpiece. The method comprises the following steps of: measuring device preparation; and data measuring and recording. According to the measuring device preparation step, a laser displacement sensor is adopted; and the laser displacement sensor rotates around a to-be-measuredcylindrical workpiece or the to-be-measured cylindrical workpiece rotates around the center axis of the to-be-measured cylindrical workpiece and the laser displacement sensor is stationary. Accordingto the data measuring and recording step, M measuring points are selected from the to-be-measured cylindrical workpiece; measurement is initiated; with every four points taken as a group, the measurement data of every four points are fitted into a circle according to a certain rule; the sum of the arc lengths of two diagonal short arcs is calculated, so that the diameter and arc length of the four-point group is obtained; and the arc lengths of all the four-point groups are added, so that a required perimeter can be obtained; and a maximum value and a minimum value are found out from the diameters of all the four-point groups, so that a required maximum diameter and a required minimum diameter can be obtained. With the method of the invention adopted, the precision and stability of perimeter measurement are improved; and requirements for the roundness of a workpiece and the centering degree of the installation of the workpiece are greatly lowered. The method has a high engineering application value.

The invention provides a rod length and cavity bottom thickness measuring machine of a constant-speed universal joint, and aims at solving the technical problems that measurement of the constant-speeduniversal joint has large errors and is inconvenient to operate in the prior art. According to the measuring machine, a measuring core rod and a thickness measuring mechanism is arranged on a pedestal, a length measuring mechanism is arranged on the thickness measuring mechanism, and a display displays parameters measured by the thickness measuring mechanism and the length measuring mechanism. Compared with measurement via a vernier caliper, the measuring efficiency is higher, the length and thickness are measured automatically by the measuring machine, errors caused by manual measurement canbe avoided, and the measuring precision of a workpiece is improved greatly.

A new type of gel film capacitive sensor and method for measuring the occlusal force of full mouth teeth. The upper and lower surfaces of the insulating medium are each pasted with a layer of ion gel as an electrolyte. These two substances are soft and transparent and pasted at several points Ion gel forms several capacitors that can change with the bite force, connect these capacitors in parallel, and paste a layer of insulating medium on the upper and lower surfaces to avoid the influence of external parasitic capacitance, and connect to the acquisition card through the bus to obtain the full bite force The total capacitance value under the action can measure the occlusal force of the whole mouth teeth; the capacitive sensor resultant force measurement device can obtain the full-mouth occlusal force by using a simple parallel circuit, while the piezoresistive force measurement device can only measure one way and cannot complete The measurement of the cumulative sum adopts a new type of gel material to ensure that the occlusal force of the whole mouth can be obtained under the condition of restoring the occlusal teeth as much as possible, and the material has good repeatability measurement accuracy, low cost, easy processing, disposable use, clean and hygienic .

The invention relates to a full-functional air-tightness tester. The full-functional air-tightness tester mainly comprises a main control system, a display terminal assembly, an input assembly, an output assembly, a communication assembly and an air path detection assembly, wherein the main control system is respectively and electrically connected with the display terminal assembly, the input assembly, the output assembly and the communication assembly; the air path detection assembly is sequentially connected with an oil fog separator, a precise pressure adjusting valve, a precise filtering device, a first pressure sensor, a first solenoid valve, a second pressure sensor and a flow sensor from an air source to a detected product by pipelines according to an air flowing direction. The full-functional air-tightness tester has the advantages that the tester has the function of detecting a pressure difference and a flow in a time division manner, and adopts a method of utilizing the independent pressure sensors to measure pressure values in the time division manner so as to calculate the pressure; a testing result is not influenced by other devices and has the better precision; and a direct testing method is used for measuring a flow tester, the testing result is very accurate, the repeated measurement precision is very high, the testing speed is fast and the service life is long.