58results about How to "Enable accurate testing" patented technology

The invention discloses a method for accurately measuring the cable force of a short boom of a boom arch bridge. A relevant measuring model is designed, boundary conditions of the boom are simplified into damping and spring supporting of a simple support boom in a corresponding transverse position, the boom is further equivalent into a simple support stretching rope with the equivalent calculation length, a mass block is additionally arranged in the middle of the boom, a vibration balance equation of ropes is set up before and after the mass block is additionally arranged in the middle of the boom, an algorithm of recognizing the equivalent calculation length L0 of the boom by using measured frequencies of the boom before and after the additional mass block is arranged is finally and optimally formed, and therefore the method for accurately measuring the cable force is set up. According to the method for accurately measuring the cable force, measurement is convenient to conduct, and a user only needs to conduct vibration frequency measurement twice on the boom before and after the additional mass block is arranged. The measuring accuracy is high, and the difficult problem of accurately measuring the cable force of the short boom can be well solved. When the method is applied to the field of detection or construction monitoring of boom arch bridges, the cable force of the short boom can be rapidly and conveniently measured at high accuracy, and therefore reliable essential data are provided for detection and monitoring of the boom arch bridges.

The invention discloses a time-domain dynamic correction method for cable measurement errors in a temperature test. When radio frequency microwave products are tested in a laboratory, radio frequency cables are needed to be used for connecting the detected products with instruments. In order to guarantee accuracy of a product test, the cables must be tested singly before usage to obtain characteristic parameters of the cables, and errors introduced by the cables are corrected in a test system. But when the detected products enter a temperature chamber for a high-low temperature cycling test, the characteristic parameters of the radio frequency cables change along with high and low temperatures, and furthermore, the cables are already connected with the detected products and the instruments in the temperature chamber, single correction can not be carried out, so accuracy of the product test is lowered. By the aid of the method, a problem that the radio frequency test cables can't be tested during temperature cycling is solved, the real-time characteristic parameters of the radio frequency cables in a high-low temperature chamber can be acquired, the acquired cable parameters are used for correcting a test result, and accurate product test in a temperature cycling test can be achieved.

The invention discloses a device for accurately testing and calibrating the optical parameters of a complex curved surface with a large diameter. The device performs testing and calibrating for the complex curved surface to be tested; The signal is sent to the laser interferometer, the compensation element and the adjustment mechanism of the complex curved surface to be measured, and the adjustment mechanism is controlled to adjust the relative position and relative angle of the three, so that the root mean square error of the surface shape of the complex curved surface is the smallest and the defocus amount is zero. ;Use the transformation matrix calibration mechanism to calibrate the coordinate transformation matrix of the laser tracker during the transfer process; based on the coordinate transformation matrix, the surface data are transformed into the same coordinate system; all surface data in the same coordinate system are Modeling analysis and calculation, and then the design results of the optical inspection compensator for the complex surface to be tested are further optimized, and the optimization result is the optimal design result of the optical inspection compensator based on the measured parameters of the mirror.

The invention relates to a preparing method for a field effect electro-catalysis hydrogen production device. At least one layer of VSe2 nano sheet is dispersed to a silicon substrate with an oxide layer, wherein the nano sheet serves as a channel material, the oxide layer serves as a dielectric layer, and metal micro electrodes are manufactured at the two ends of the channel material; spin coating of an insulation layer is conducted, and a rectangular window is etched between the two metal micro electrodes; and the oxide layer is removed from the blank side of the silicon substrate, a contact point of a back gate electrode is manufactured, and an electrolyte is injected to the surface of the device to obtain the field effect electro-catalysis hydrogen production device. The preparing method has the beneficial effects that the preparing method can serve as the new strategy for optimizing the electro-catalysis performance of nano materials.