The Thermoelectric Cooler is also called Semiconductor refrigeration module, Peltier, etc. . Because of there are two sides, one side absorbs heat, and the other side dissipates heat. Its effect is heat conduction. It does not produce heat by itself. So it is called Refrigeration piece or thermoelectric cooler module. 1.Summary Propaedeutic 1．Peltier effect The conceptual structure of Peltier effect is very simple. When the current goes through the thermal couple, one of the nodes dissipates h...(more)
Thermoelectric cooler (TEC), which was first found by Peltier in 1834, is a semiconductor material as the foundation, and it can be used as electronic components of a small heat pump. Through loading a low DC voltage on both ends of the TEC, the heat will move from one side of the element to the other. At this time, the temperature of one side of TEC will be reduced, and the other side temperature will rise. It is worth noting that, as long as the direction of the current is changed, the directi...(more)
There are many kinds of laser, such as solid, gas, liquid, semiconductor, dyeslaser, etc.. (1)Solid state laser is generally small and rugged, and high power of pulse radiation. The application range is wide. Nd: YAG laser is one of solid-state laser. Nd(nd) is a kind of rare earth element, and YAG stands for yttrium aluminum garnet, whose the crystal structure is similar to that of ruby. (2)Semiconductor laser has the advantages of small volume, light weight, long service life, simple structure...(more)
As semiconductor laser has the advantages of small size, simple structure, high electro-optical efficiency, long service life, easy modulation and low price, so it has a wide range of applications. In optical fiber communications, which have become the mainstream of modern communications, semiconductor laser is the only practical light source.Now, it is the fastest growing and the most important light source in the optical communication field. In laser ranging, semiconductor laser rangefinderhas...(more)
Semiconductor laser is also known as laser diode (LD). As early as in 1953, in an unpublished manuscript, John Von Neumann was the first to discuss the possibility of stimulated emission produced in the semiconductor. He considered that stimulated emission can be achieved through the injection of minority carriers to the PN junction, and the transition rates between two Brillouin zones were calculated. After summing up this theory, Bardeen believed that through a variety of methods disturbing co...(more)
In the car field, there is no enterprise specializes in the production of LED lamps. Only a few optoelectronic industries do the research and development in this area. The development bottleneck of domestic LED automotive lamps mainly comes from the following there aspects: First of all, the cost of making LED lamps is too high. The technology of LED chip production is different and the threshold is high. In the crystal growing process, temperature, humidity, power supply and dust elimination ne...(more)
Some low or medium heat transfer, which needs complex temperature control process, thermoelectric cooler can provide great help. And in certain cases, it is the only choice. Although no refrigeration is universal and thermoelectric cooler cannot be applied in all fields, compared with other cooling devices, thermoelectric cooler (see Fig.1) has a lot of advantages. Fig.1Thermoelectric coolerFig.2 Mechanical refrigeration (1) No moving parts: When working, thermoelectric coolers only use electric...(more)
Today I want to introduce the definition of Laser driver. The laser driver, as the name suggests, it is the instrument of the laser control. Generally used to control the semiconductor laser. Including temperature controller and laser diode drive. It is necessary to control the temperature of the device because of the semiconductor device sensitive to temperature, and the semiconductor laser with a constant current source drive, usually it require a current source. The following is the figure of...(more)
