41results about How to "Realize high-precision testing" patented technology

The invention relates to a pipeline aperture deformer for trenchless pipeline laying, which is characterized by comprising a deformation rack, a conveying rod, an oil cylinder amplification mechanism, a displacement sensor and a sensor storehouse, wherein a big piston of the oil cylinder amplification mechanism is fixedly connected with the right end of a mandrel of the deformation rack, and a right end part of the oil cylinder body of the oil cylinder amplification mechanism is fixedly connected with a left end part of the sensor storehouse; the displacement sensor is positioned in the sensor storehouse, the displacement sensor is fixed by the oil cylinder body of the oil cylinder amplification mechanism through a sensor bracket, and the left end of a touch rod of the displacement sensortouches with a small piston of the oil cylinder amplification mechanism; the deformation rack comprises a supporting body, a deformation claw, an open spring, a wringing seat, a rear supporting body,a recycling spring, a connection cylinder and a mandrel. The invention has the characteristic of high test precision.

The invention discloses a fiber grating arch bridge-shaped pressure sensor. The fiber grating arch bridge-shaped pressure sensor comprises a combined metal box, an arch bridge-shaped elastic device, a metal wire and a fiber grating; two ends of the metal wire are connected with a middle part of the arch bridge-shaped elastic device, and the fiber grating is adhered on the metal wire; the combinedmetal box comprises an upper part and a lower part, the upper part and the lower part can move relatively in longitudinally direction, when the upper part of the combined metal box bears pressure, the pressure wholly acts on the upper part of the arch bridge-shaped elastic device, and one end of the arch bridge-shaped elastic device is fixed at the bottom of the metal box while the other end thereof is a movable end. The pressure sensor based on fiber sensing is formed through the fiber grating sensing technology, and high-accuracy measurement on perpendicular stress is implemented.

The invention discloses a mechanical performance testing table for a piston engine. The mechanical performance testing table for the piston engine includes a rack, a shaft and sensors used for testing thrust and torque respectively. Two ends of the shaft are installed together with slide bearings arranged on the rack fixedly. An end part of the shaft is fixedly provided with an installation flange connected with the engine and a propeller assembly. The shaft is fixedly provided with an arm of force that is perpendicular to the axis of the shaft. The torque sensor is arranged between the arm of force and the rack and is perpendicular to the axial of the shaft spatially. The thrust sensor is arranged between the shaft and the rack and along the axis of the shaft. The mechanical performance testing table for the piston engine provided by the invention can be used for conducting comprehensive mechanical performance tests for the piston engine, thereby providing test data for development of engines, model selection and matching of propellers and design of planes. By utilizing the mechanical performance testing table for the piston engine that is diversified in functions, low in cost, simple in structure and high in testing precision for conducting reliability tests of the engine, man power consumption, material input and cost are reduced and efficiency of piston engine research and development is improved substantially.

The present application discloses a large aperture optical system detection method, device, equipment and storage medium. The method includes: designing a rectangular aperture collimator with a rectangular primary mirror; performing self-collimation calibration on the rectangular aperture collimator; controlling the calibration The final rectangular aperture collimator rotates at multiple angles to perform full-field coverage imaging performance testing in different directions of the inspected optical system; integrate the imaging performance inspection data of all fields of view of the inspected optical system to obtain the overall imaging of the inspected optical system performance evaluation results. This application detects the imaging performance of a large-aperture optical system through multi-angle rotation of a rectangular aperture collimator, which is low in cost and high in performance. High-precision testing of aperture optical systems.

A high-precision angle measurement method. First, the object to be measured is placed on the rotating platform, and then the 720-tooth indexing table and the 391-tooth indexing table are combined on the rotating platform, and the 720-tooth indexing table and the 391-tooth indexing table are combined Place the plane mirror on the indexing table combination; then adjust the photoelectric autocollimator so that the measuring light emitted by it is aimed at the plane mirror; turn the combination of the 720-tooth indexing table and the 391-tooth indexing table to rotate an angle, and Record the value of the rotation angle at this time, and then reversely rotate the rotary platform so that the measurement light emitted by the photoelectric autocollimator is re-aimed at the same aiming position on the plane mirror. At this time, the 720-tooth indexing table and the 391-tooth indexing table are combined The value of the rotation angle is the angle value of the rotation of the sensitive device to be tested. The method of the invention has simple operation steps and can realize high-precision testing of the whole circle angle.

The invention discloses diffraction property low-light test system and method of an acousto-optic tunable filter (AOTF). The system comprises a monochromatic light source system, an optical signal modulation system, an optical system and an photoelectric detection system, wherein the monochromatic light source system can generate monochromatic light beams with continuous and adjustable wavelengths, the frequency modulation can be carried out on the monochromatic light beams by a light chopper after passing through a diaphragm orifice, and an alternating-current optical signal sequentially passes through a collimating lens, a polarizer and an optical filter to form single-wavelength collimated polarized light which is vertically incident to the AOTF; and converged zero-level light and diffracted light generated after driving are bent to different directions by a prism and respectively received by two photoelectric detectors, therefore, the diffraction property of the AOTF is analyzed. The device of the invention has simple principle and strong operability, and can satisfy the continuous wavelength test requirements of the AOTF and simultaneously greatly improve the test efficiency through automatic control software. The invention realizes the low-light condition detection aiming at the application requirement of the AOTF under the low light by utilizing a phase locking circuit and improves the test precision. The system realizes the independent test of the zero-level light and the diffracted light and improves the test accuracy.

In order to solve the problem that the current optical axis parallelism test device cannot satisfy the test problem of optical axis parallelism of each optical sub-system of multi-spectral photoelectric equipment, the present invention proposes a multi-spectral optical axis parallelism test device and a test method. The present invention uses off-axis parabolic mirrors, beam splitters, short-wave infrared cameras, wide-spectrum light sources, target targets and laser light sources to realize the simulation of wide-spectrum infinite targets. According to the imaging position of the simulated target in each optical subsystem, The parameters of each optical subsystem and the focal length of the collimator, and the calculation of the consistency of the optical axis between the optical subsystems, can complete the visible light imaging system, infrared imaging system, laser emitting system, laser receiving system, visual inspection system in multi-spectral photoelectric equipment. The test of the parallelism of the optical axis between the aiming system and the mechanical reference of the equipment can realize all the requirements of the optical axis consistency of the current optoelectronic equipment.

The invention discloses a high-precision method for measuring interface contact thermal resistance by a bidirectional heat flow method, which belongs to the technical field of testing. In the bidirectional heating heat flow method adopted in the present invention, a heating body is arranged at the center of the test body, and multiple layers are arranged around the heating body. Compared with the end, the vacuum heat shield is easier to be insulated, and realizes one-dimensional heat conduction of the sample pair. The invention can measure the interface contact thermal resistance of two groups of samples to the material at the same time; and adopts advanced non-contact thermal imaging technology to perform average processing of multiple data points, which can realize high temperature, transient and micro-nano scales with higher precision The high-precision interface contact thermal resistance test can be realized, and the interface contact thermal resistance test can be realized from normal temperature to 2700℃.

The invention provides a linear vibration and overload combinatorial testing method and an apparatus thereof. The apparatus is composed of a disc centrifuge and a high-speed rotation platform. The high-speed rotation platform is arranged on the disc centrifuge. The shaft of the disc centrifuge is parallel to the shaft of the high-speed rotation platform. The testing method comprises the steps that: an inertial instrument requiring testing is arranged on the rotation platform; testing signals are transmitted to a ground monitoring computer through a slide ring; the centrifuge and the high-speed rotation platform are powered up, and null positions are controlled; an input shaft of the inertial instrument is calibrated; a controlling program is started; rotation speeds of the centrifuge and the high-speed rotation platform are adjusted; and the performance of the inertial instrument is analyzed. With the apparatus and the method provided by the invention, technology realization difficulties caused by large weight and volume of a electromagnetic vibration shaker can be greatly reduced; and high-precision testing is realized while environmental test is achieved.