The principle of the Hall effect thickness gauge: refers to the physical phenomenon of a lateral potential difference when a magnetic field acts on carriers in current-carrying metal conductors and semiconductors. The Hall effect of metal was discovered by the American physicist Hall in 1879. When current passes through the metal foil, if a magnetic field is applied in a direction perpendicular to the current, a lateral potential difference will appear on both sides of the metal foil. The Hall effect in semiconductors is more pronounced than in metal foils, while ferromagnetic metals will exhibit extremely strong Hall effects below the Curie temperature. According to the principle of the Hall effect thickness gauge, people use semiconductor materials to make Hall elements. It has the advantages of sensitivity to magnetic fields, simple structure, small size, wide frequency response, large output voltage changes, and long service life. The fields of automation, computer and information technology are widely used. Various sensors can be designed and manufactured using the Hall effect principle. The basic relationship of Hall potential difference UH is UH = RHIB / d (18) RH = 1 / nq (metal) (19) In the formula RH——Hall coefficient: n—— carrier concentration or free electron concentration; q——electronic power; I——Current passing through; B——magnetic induction intensity perpendicular to I; d——The thickness of the conductor. 2 What are the wooden handicrafts - wine rack Wood Craft,Wooden Craft Boxes,Wooden Wine Gift Box,Wooden Bottle Crate,Custom Wood Craft,OEM Wood Craft Jinan Tri-Tiger Technology Development Co., Ltd , https://www.tigerwoodproduct.com
The shelf for placing various drinks can be made of wood. Such a wooden wine shelf is not only beautiful but also very practical. Generally, the drinks to be displayed are very expensive, and many people store them accordingly. The wood used to make the wine rack should consider what kind of wood is best to choose. In fact, the wood used in general is not ordinary, especially in large shopping malls and high-end clubs. The wood for wine racks is very expensive.
3 What are the wooden handicrafts - jewelry box
Most of the boxes used to place jewelry are made of wood, and some gold jewelry is suitable for wooden jewelry boxes. Jewelry is an accessory worn by women. When not wearing it, it is usually placed in a jewelry box. Which jewelry to choose is also taken out from the inside. It is also important to place jewelry. If the material of the jewelry box is not suitable, it will not have a good maintenance effect. The wooden jewelry box is multi-purpose.
4 What are the wooden handicrafts - root carving
Using the root carving method, the self-generated form and distortion behavior of tree roots are used as the artistic creation objects. Through conception and processing, artistic image works such as characters and animals are created. Root carving artworks can be collected, especially the more precious the wood selected, the more valuable the carved artworks. In fact, the root carvings are rarely artificially modified, and the artworks are more natural and beautiful.
5 What are the wooden handicrafts - screen
A screen is a kind of furniture used in traditional Chinese buildings to block the wind. Screens have a long history and are generally displayed in prominent positions in the interior, which can be used to divide, beautify and block. As an inseparable part of Chinese home decoration, it is a good way to present the beauty of nature and tranquility. The screens used in ancient times are made of wood, and there are exquisite pattern carvings on them, which are of great artistic value.