3results about How to "Avoid shadow effect" patented technology

The application provides a manufacturing method of a three-dimensional braided preform with low fiber volume content, which comprises the following steps: selecting fibers, braiding the fibers to form a first three-dimensional braided bundle, and the fiber volume content in the first three-dimensional braided bundle is 40%-60%; braiding the first three-dimensional braided bundle again to form a second three-dimensional braided preform, and the fiber volume content in the second three-dimensional braided preform is 20-35%. The three-dimensional braided bundle with the same thickness is used to replace the fiber bundle composed of single filaments, so that the size and distribution of the gap in the preform are more uniform, which is beneficial to the densification of the subsequent curing process, reduces the porosity, and improves certain structure and physical and chemical performance indexes.

The invention relates to the technical field of meteorological ecological observation, biological safety detection, environment monitoring and the like, and discloses a biological aerosol automatic identification system and method based on ultraviolet fluorescence imaging, and the system comprises an environment control module, an aerosol sampling module, an adhesive tape transmission module, an ultraviolet microscopic imaging module and a control and data processing module. The environment control module is used for constructing a constant-temperature closed optical darkroom; the aerosol sampling module captures biological particles in the air on the surface of a carrier adhesive tape by utilizing an acceleration nozzle and an inertial impact principle; the adhesive tape transmission module realizes automatic transfer of a sample from a sampling position to a detection position through stepping control; the ultraviolet microscopic imaging module adopts a coaxial incident light path structure and is matched with a dichroic spectroscope and an optical filter to separate exciting light and fluorescence signals. According to the invention, full-process automatic in-situ monitoring of the biological aerosol is realized, the problem of background interference is effectively solved, and the real-time performance of detection and the recognition accuracy are improved.

This invention relates to the field of vacuum coating technology, specifically to a band saw blade coating device and its coating process. The device includes a vacuum coating chamber, a drive mechanism with its output end located within the vacuum coating chamber, and several linkage mechanisms. A support frame, connected to the drive mechanism, is installed within the vacuum coating chamber. The support frame includes a rotatable central column. Each linkage mechanism includes a horizontal shaft rotatably connected to the central column. An inclined shaft, forming an angle with the horizontal shaft's length direction, is mounted on the inclined shaft. A rotating bearing is sleeved on the inclined shaft, and a clamping mechanism for holding the band saw blade roll is sleeved on the rotating bearing. Within the vacuum coating chamber, the band saw blade roll can not only revolve but also change its lateral and vertical angles, allowing the saw teeth to face the target material at more angles. This effectively overcomes the shadow effect caused by the existing technology's limited revolving and rotating capabilities, which results in coating blind spots and uneven film thickness on the saw tooth side. This improves the coating uniformity of all parts of the saw tooth side, especially the front tooth side.