HZG Revolving Cylinder Drier Changzhou ErBang Drying Equipment Co., Ltd. , https://www.hywellmachinery.com
Terahertz imaging device structure
The successful development of the above imaging chip is an important advancement in THz high-speed imaging technology, which is of great significance for the development of high-speed, high-energy physical processes, material analysis, and biomedical imaging technologies in this frequency band.
(Original title: Ultra-high-speed terahertz array imaging chip successfully developed)
Chinese Academy of Sciences Successfully Developed Ultra-high Speed ​​Terahertz Array Imaging Chips
ã€Chinese instrument network instrument research and development】 High-speed imaging technology is one of the important research directions in the application of terahertz (THz) technology. It has important application value in material analysis, high-energy physics process analysis, biomedical imaging, and human body security. However, the lack of low-temperature matching readout circuits makes the design of fast-response photon-type focal plane array detectors very difficult. This has led to slow progress in high-speed and real-time imaging of THz. To solve this problem, the research team led by Cao Juncheng, a researcher of the Shanghai Institute of Microsystem and Information Technology of the Chinese Academy of Sciences, used molecular beam epitaxy to stack THz quantum well detectors (THzQWP) and light-emitting diodes (LEDs). Pixel imaging of the THz frequency upconverts the imaging chip. The chip's peak detection frequency is 5.2 THz, equivalent noise power is 5.2pWâ„Hz0.5, and the equivalent imaging pixel is 240×240. The imaging experiment of the THz quantum cascade laser (THzQCL) with this chip has been completed. Real-time imaging of several tens of micrometer diffraction fringes on the THzQCL spot has been achieved (Figure 2), and the THz QCL spot has been completed within 500 ns. Single-frame high-speed imaging (equivalent to two million frames/s imaging speed). The relevant research results were published in Scientific Reports 6, 25383, 2016.
The working principle of the rotary drum Dryer mainly includes the following points:
Equipment Structure: The rotary drum dryer primarily consists of a heat source, a feeding machine, an inlet device, a rotary drum, a discharge machine, an induced draft fan, a discharge valve, and an electrical control cabinet. The drum body is slightly inclined, with adjustable rotation speed within a certain range.
Operating Principle: After wet materials are fed into one end of the dryer, they are evenly distributed and dispersed inside the drum under the agitation of uniformly arranged lifting boards. Simultaneously, hot air (either concurrent or countercurrent) passes through the drum, fully contacting the materials to accelerate the drying heat transfer and mass transfer processes. This causes the moisture in the materials to evaporate into steam, which is then carried away by the hot air, achieving the purpose of drying.
Material Movement: During the drying process, the materials, under the action of the inclined lifting boards and hot air, move in a controllable manner to the other end of the dryer, where they are discharged through a star-shaped discharge valve.
Adaptability: The equipment can use various types of lifting boards to accommodate different materials. It features a simple structure, reliable operation, easy maintenance, large production capacity, and can operate continuously.
Direction of Hot Air and Material Flow: Based on the flow direction between the hot air and the materials, the rotary drum dryer can be divided into concurrent and countercurrent types. In the concurrent type, the hot air flows in the same direction as the material movement; in the countercurrent type, the hot air flows in the opposite direction to the material movement. These two methods each have their advantages and disadvantages and are suitable for drying different types of materials.
In summary, the rotary drum dryer achieves continuous and efficient drying of materials through its unique structure and operating principle.