40results about How to "Adaptive detection" patented technology

A bolt torque detection device is characterized in that a rack slides up and down in the vertical direction on a rack base, wherein the rack is supported by the rack base to rotate around a horizontal line, the rack is coaxially connected with a rotating sleeve, and a tension tester is in transmission connected with the rack and drives the rack to slide; a head chuck is placed in a head supporting base hole to limit rotation of the head chuck around the horizontal line and relative to the head supporting base; rotation of a bolt head around the horizontal line and relative to the head chuck is limited; rotation of a nut chuck around the horizontal line and relative to the rotating sleeve and translation of the nut chuck along the horizontal line are limited; rotation of a nut around the horizontal line and relative to the nut chuck is limited; the nut and the bolt head are the same in height; the head supporting base is provided with a back cap hole, the end of a back cap stretches into the head supporting base hole to abut against the head chuck and the bolt head of a bolt in the head chuck, and leftward movement of the bolt head along the horizontal line and rotation of the bolt head around the horizontal line are limited. The bolt torque detection device is practical, precise, intuitive, rapid, convenient to use and low in cost and price.

The invention discloses a SERS-fluorescence double-mode metal reinforced substrate and a preparation method of the SERS-fluorescence double-mode metal reinforced substrate. The preparation method comprises the following steps: (1) the surface of a substrate is polished by abrasive papers with multiple model numbers in sequence to remove an oxide layer and the like, so that the surface of the substrate is smooth, and the surface roughness is lower than 0.1 micron; and the polished substrate is ultrasonically cleaned to remove impurities on the surface; and (2) the substrate is positioned on a worktable of an ultrashort pulse laser processing system; laser parameters are set; a laser processing system is started; a galvanometer is used for scanning to enable laser to repeatedly scan on the substrate at a certain speed; and finally, a three-dimensional micronanometer periodical composite structure is obtained on the surface of the substrate. The preparation method is simple in process andlow in cost, has no need to add any reducing agent or surface active agent, and is high in stability and repeatability and suitable for large-scale commercial production.

The invention relates to the technical field of bridge detection equipment, in particular to a simple bridge-accompanying detection vehicle. The simple bridge-accompanied detection vehicle comprises abase, a counterweight structure, a supporting rack, a builder's jack, a hoisting frame and a suspension cage. The base is placed on a bridge floor. The counterweight structure comprises a counterweight and a counterweight plate. The counterweight plate is arranged on the base, and the counterweight is stacked on the counterweight plate. The supporting rack is vertically arranged on the base, thebuilder's jack is horizontally arranged at the top end of the supporting rack, the hoisting frame on the builder's jack is of a movable structure, and the suspension cage is movably connected to the bottom of the hoisting frame. The simple bridge-accompanied detection vehicle has the effects of saving the energy sources and lowering the cost.

The invention relates to a device for detecting and comparing the performance of filters as well as a detection method. The device comprises a filter performance detecting device, a detecting source generating device used for generating a detecting source, a detecting source processing device used for detecting post-processing detecting source, and a vacuum-pumping device used for vacuumizing before detection, wherein the filter performance detecting device comprises a sealing outer housing, a detection atmosphere chamber and a vacuum chamber; a detecting filter device used for mounting of a detected filter is arranged in the vacuum chamber; the detecting source generating device is communicated with detecting atmosphere chamber through an detecting source inlet; the detecting source processing device and the vacuum-pumping device are communicated with the vacuum chamber through detecting source discharge outlets respectively; a pre-filtration detecting instrument and a post-filtration detecting instrument are arranged at the tops of the detecting atmosphere chamber and the vacuum chamber respectively. The sealing outer housing is transparent, so that the filter effect of each filter can be observed relatively intuitively, and the filter effects of different filters can be observed relatively intuitively.

The invention discloses a short-time Fourier transform-based method for measuring intrapulse frequency coded signal parameters, which belongs to the technical field of radar signal reconnaissance, and can detect and receive signals in complex environments where there are intrapulse fluctuations, strong interference in the environment, and Intra-pulse frequency-encoded signals under weak conditions are used for parameter measurement. Specifically: perform short-time Fourier transform STFT on the signal to be detected, perform two-dimensional morphological filtering to smooth the noise floor, and perform two-dimensional cross-threshold detection, that is, calculate the adaptive threshold and large signal threshold, and take the adaptive threshold The larger value of the large signal threshold and the large signal threshold is used as the current detection threshold, and the threshold passing detection is performed on the STFT transformation result. The subcode is detected in the two-dimensional threshold crossing detection result. Intercept the data corresponding to each subcode from the original data of the signal to be detected according to the start and end positions of the detected subcode, and perform Fourier transform FFT to calculate the frequency of the subcode, and further calculate other parameters of the signal to be detected according to the frequency of the subcode .