In 1821, Thomas Seebeck discovered when two conductors with different materials and different temperature are connected, there is current flowing in the loop However, twelve years later, J. C. Peltier discovered an opposite phenomenon, that is ,by deleting a conductor in the loop, the external current can flow through the loop, and then a temperature difference between two connecting points is appeared. This phenomenon came to be known as Peltier Effect. Owing to the limitation of material at th...(more)
As a fourth-generation automobile light source, LED (Light Emitting Diode) lamps have been widely used for producing many beautiful car style by car manufacturers. LED light has many advantages including no delay, energy saving, long life, low heat, seismic resistance and high color purity and it has taken place of tungsten filament lamps and halogen lamps in many fields. Although its cost is very high, LED lamp has incomparable advantages of good quality and high grade when comparing with incan...(more)
Semiconductor laser is also known as laser diode, which uses semiconductor materials as lasers operation materials. When comparing with other lasers, laser diode has incomparable performances, such as low driving voltage, high efficiency and safe incentive mode, so that it can be widely used for long-distance communication, digital signal storage and recovery, laser range holographic application, etc. Semiconductor laser has strict demands on working conditions and it is much affected by the ope...(more)
Semiconductor laser is also known as laser diode, which uses semiconductor materials as lasers operation materials. When comparing with other lasers, laser diode has incomparable performances, such as low driving voltage, high efficiency and safe incentive mode, so that it can be widely used for long-distance communication, digital signal storage and recovery, laser range holographic application, etc. Semiconductor laser has strict demands on working conditions and it is much affected by the ope...(more)
A glass sealed NTC thermistor is a high reliability and sensitive device, based on the technology of glass sealed diodes. It has high mechanical strength and also can prevent the performance drift caused by sensitive chips exposed to the atmosphere and the physical and chemical adsorption. While the glass is relatively high, it can be good for overcurrent protection and temperature compensation of NTC thermistors. There are two types of glass sealed NTC thermistors: axial glass sealed NTC thermi...(more)
LED electronic display screen is an electronic display, which is combined with computer technology, information processing technology, electronic technology, phonology, chromatics and other high and new technologies. The LED display screen can be divided into monochrome screen, double color screen and full color display. As the name implies, the monochrome screen is composed of a single color of LED (see figure 1). A pixel display which is in the red and green LED is called double color screen o...(more)
With the rapid development of the photoelectric technology, laser products have widely used in medical treatment, national deense and measurement and other areas. The change of environment temperature has made a directly effect on wavelength of laser controleller. Put the main elements temperature limited in the narrow range which can increase the precision of the system. The semiconductor laser controller consists of controlled constant surrrent source, temperature monitoring, pilot circuit and...(more)
Power Supply can convert another form power into electrical energy. The generators convert mechanical energy into electrical energy, dry cell convert chemical energy into electrical energy. The battery itself has no electricity. There are positive and negative charges on its two poles. They will provide voltage; electrical conductor has voltage in itself. When we add voltage, it will produce electricity. When the batterys two poles connect with conductor, it releases charge so that generate elec...(more)
