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

The invention discloses a single focal plane high-precision testing method for optical wavefront of an optical imaging system, relates to the technical field of optical testing, solves the problems that exit pupil amplitudes are not distributed uniformly and calculation errors are introduced by fast Fourier transform in the conventional phase retrieval algorithm, and provides the scheme for eliminating the influence of vibration in the process of image acquisition on detection accuracy. The method comprises the following steps of: establishing a detection platform of the optical imaging system; detecting the position of the focal plane of a lens to be detected by using a detection device in the detection platform and acquiring an out-of-focus stellar image of the lens to be detected by the detection device; selecting effective data according to the acquired out-of-focus stellar image and calculating a pupil function of an optical system; and extracting the phase of the acquired pupil function to obtain the optical wavefront of the optical imaging system. The pupil function of the optical system is calculated by a Zernike multinomial, an extended Nijboer-Zernike multinomial, and a generalized inverse matrix. The single focal plane high-precision testing method is low in cost, and high in accuracy and is suitable for manufacturing enterprises, scientific research and detection units of the optical imaging system.

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.

The invention discloses a device used for testing the static and dynamic performance of a damper. The device comprises a main machine part, a measurement and control part and a hydraulic part, wherein the main machine part is used for executing and achieving the test on the static and dynamic performance of the damper, the measurement and control part is used for controlling the main machine part to test the static and dynamic performance of the damper, and the hydraulic part is used for providing a hydraulic energy source for the main machine part to carry out the test on the static and dynamic performance of the damper. The device can effectively improve natural vibration frequency of a mechanical part, reduce the influence on the test accuracy from the vibration of the testing device, meet the requirement for the high-frequency power test, and achieve high-accuracy test on the static and dynamic performance of the damper under actual environmental conditions.

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 sensor touches 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 an instrumentation indentation test method for elastic-plastic parameters of a material based on a single Vickers pressure head. According to the method, the strain hardening exponent, elasticity modulus and offset yield strength sigma 0.2 of the metal material are determined by virtue of three instrumentation indentation load-depth curves in which indentation positions have special aggregation manners. The method has the advantages that the strain hardening exponent, elasticity modulus and offset yield strength sigma 0.2 of the metal material can be tested only by virtue of the single diamond Vickers pressure head; the high-precision test on the elasticity modulus of the material can be realized based on the tested strain hardening exponent of the material; the indentation positions of the three instrumentation indentation have aggregation properties, and the elastic-plastic parameters of the microcell material can be tested.

In order to solve the problem that a current optical axis parallelism testing device cannot meet the requirement for testing the optical axis parallelism of all optical subsystems of multi-spectrum photoelectric equipment, the invention provides a multi-spectrum optical axis parallelism testing device and a multi-spectrum optical axis parallelism testing method. According to the invention, the off-axis parabolic mirror, the spectroscope, the short-wave infrared camera, the wide-spectrum light source, the target and the laser light source are adopted to realize simulation of a wide-spectrum infinite target. According to the imaging position of the simulation target in each optical subsystem, the parameters of each optical subsystem and the focal length of the parallel light tube, the consistency of the optical axes of the optical subsystems is calculated, the test of the parallelism of the optical axes among a visible light imaging system, an infrared imaging system, a laser transmitting system, a laser receiving system, a visual aiming system and an equipment mechanical reference in the multi-spectrum photoelectric equipment can be completed, and all the requirements of the consistency of the optical axes of the current photoelectric equipment can be met.

The invention provides a multi-type high-precision planetary roller lead screw pair precision detection device which comprises a grating ruler, a reading head, a slider, a linear guide rail, a nut sleeve, a punch molding device, a display screen and the like. The two-way positioning handle of the punch molding device is connected with a three-jaw chuck through a rotating shaft, and the three-jaw chuck clamps a lead screw for synchronous rotary motion. One end of a nut sleeve guide rod is fixedly connected with a connection plate, and the other end is fixedly connected with the nut sleeve. Both ends of the connection plate are fixedly connected with the slider and the reading head. The reading head horizontally slides on the grating ruler. The slider slides horizontally on the linear guide rail. The nut position information acquired by the reading head is displayed on the display screen during the straight nut movement. The device provided by the invention can test the return error, the two-way lead precision and the like of a planetary roller lead screw pair, has the advantages of high test precision and simple operation, and is suitable for the test of multiple types of planetary roller lead screw pairs. A reliable method is provided for the precision test of the planetary roller lead screw pair.

The invention relates to the technical field of signal processing and applying of differential pressure transducers, in particular to an equal-precision measuring method used for the differential pressure transducer. The equal-precision capacitance frequency measuring method is adopted for counting capacitor charge time; according to the principle that charge time varies from capacitance values to capacitance values, a counting value in direct proportion to a differential pressure transducer capacitor can be obtained, T is calculated through a micro-processor, and therefore an output capacitance value of the differential pressure transducer is obtained. In the method, an FPGA chip is adopted as a core circuit, a circuit signal control function module, a counter function module, a standard signal input function module and the like are achieved, and high-precision testing of the output capacitance value of the differential pressure transducer is achieved.

The invention belongs to the technical field of photoelectricity testing, and relates to an infinite and finite conjugated differential detection focusing photoelectric image analyzer which integrates light, machine, electricity, arithmetics and automatic control and a realizing method thereof. According to the invention, clear acquisition and focus fixing of a reflection light path target image are realized through high precision differential confocal focusing of a transmission light path; finite conjugated optical system parameters are tested by adding an optical-electric image analyzer measurement objective lens; through translation and rotation of the photoelectric image analyzer, optical parameters of optical system axis and out-of-axis fields and a folding axis system are measured; and finally high-precision comprehensive test of axis and out-of-axis field optical parameters of an infinite and finite conjugated target optical imaging system is realized. The infinite and finite conjugated differential detection focusing photoelectric image analyzer can precisely, rapidly and automatically collect, analyze and process images of the optical system through a corresponding measurement method and software control, so as to acquire performance parameters of an infinite and finite conjugate photoelectricity instrument.

The invention belongs to the technical field of sensor tests in the aviation industry, and specifically relates to a linear displacement sensor test device applicable to the high and low temperature environment. According to the device, a stator is fixed in a high and low temperature test box through a stator installation support, a rotation system is provided with a rotor installation support, a rotor is fixed on the rotor installation support, the rotation system can drive the rotor to rotate, and the coaxiality between the stator and the rotor is adjusted; an elevating system is connected with the rotation system, and the rotation system can be driven to move in the vertical direction so that vertical movement of the rotor of the rotation system in the high and low temperature test box can be realized; a base serves as the common reference of the whole test device and has a support effect on each part; and horizontal adjustment of the whole test device is realized through leveling anchors. According to the device, the high and low temperature test environment is simulated, high-precision relative movement of the stator and the rotor of a linear displacement sensor is realized, artificial rough adjusting process during the test is cancelled, and automation of the test process is realized.

The invention discloses a pressure sensor performance testing device and method for a gunpowder vacuum stability test. The device comprises a corrosion gas chamber, a gas balancing device, a corrosiongas conveying pipeline, an inert gas conveying pipeline, a corrosion gas pressure controller and an inert gas pressure controller. The corrosion gas chamber is provided with a gas inlet, a gas outletand a to-be-detected pressure sensor connecting port; the gas balancing device comprises a gas chamber and a deformable dividing piece arranged in the gas chamber, and the dividing piece divides thegas chamber into a corrosive gas cavity and an inert gas cavity which are independent of each other; the corrosive gas conveying pipeline is connected with a corrosive gas inlet of the corrosive gas cavity, and the inert gas conveying pipeline is connected with an inert gas inlet of the inert gas cavity. According to the invention, the corrosive gas pressure controller and the inert gas pressure controller are adopted to carry out coarse adjustment on the corrosive gas pressure and the inert gas pressure, and then the gas balancing device is used for carrying out more accurate adjustment to test the high temperature resistance and the corrosion resistance of the high-precision pressure sensor.

The invention discloses a motor comprehensive performance test method and a system, wherein a motor comprehensive performance test host is connected with the output side of a test wire connector on a motor comprehensive performance test platform through a test function switching module, and the input side of the test wire connector is connected with a tested motor through a quick connection interface. The tested motor is fixed on a test tool through a motor auxiliary clamping device and is connected with a servo motor, and the servo motor and a servo motor built-in encoder in the servo motor are connected with a motor comprehensive performance test master control module through a servo driver. And a motor comprehensive performance test master control module controls the execution sequence of the test items through a motor comprehensive performance test software, sends an action instruction to execution equipment, stores test data and judges the performance standard reaching condition. According to the invention, automatic testing of the tested motor without manual participation in the whole intermediate process from detection to extraction can be realized, the accuracy is high, the reliability is good, the system is simple and easy to implement, and the generalizability is high.