A glass encapsulated thermistor mainly plays a role of temperature compensation. There are some kinds of packaging materials, such as epoxy resin, SMD, glass and so on. The glass encapsulative has high temperature resistance and moisture resistance. However, comparing with some other packaging forms, its responding speed is a little slow, around ten senconds.(more)
A laser diode is a diode which outputs a laser beam.
Unlike LED light, a laser's light output is more concentrated, meaning it has a smaller and more narrow viewing angle. This means it must be directed at its source more directly in order to be picked up. Laser light is also monochromatic, meaning laser light isn't composed of several lights combined together, but one light of the same wavelength and energy. Normally with LEDs, the different light outputs are based upon different colors combined. One such example is green light. To output green light, blue and yellow lights are combined to give green. Lasers, for the most part, do not follow this. Laser lights have a single spectral color and is almost the purest monochromatic light available.(more)
Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature. Negative Temperature Coefficient (NTC) thermistors exhibit a decrease in electrical resistance when subjected to an increase in body temperature and Positive Temperature Coefficient (PTC) thermistors exhibit an increase in electrical resistance when subjected to an increase in body temperature. U.S. Sensor produces thermistors capable of operating over the temperature range of -100° to over +600° Fahrenheit. Because of their very predictable characteristics and their excellent long term stability, thermistors are generally accepted to be the most advantageous sensor for many applications including temperature measurement and control.(more)
A screwdriver is used to turn the screws and force them in the place. There is usually a thin wedge head, which can be inserted into the screw head slot or recess. The screwdriver shape is mainly divided intwo types:slotted screwdriver and cross screwdriver. The six angle screwdriver is also very common, whichincludes inner six anglescrewdriver and outersix corner screwdriver.(more)
There is no screwdriver with round head because the round head has no torque.The flat headscrewdriver is to ensure the torque, and the Phillips screwdriver can distribute power uniformly.According to the power source, screwdriver can be divided into manual screwdriver and electric screwdriver; According to the shape of cutter head,it can be divided into flat head screwdriver and Phillips screwdriver. The cutter head ofgood quality screwdriver is made of spring steel with relatively high hardness.A good screwdriver should meet thedemand of appropriate hardness and toughness.When the groove of screw head goes bald, we can use a hammer to hit a screwdriver, and then the groove will become deep, and it will be easy to twist the screw out, but the screwdriver should be unscathed. A screwdriver is often used to pry the things, so it requires certain toughness.Generally speaking, the screwdriver head hardness should be greater than HRC60, which is not easy to rust.(more)
Thermistor is one of thermal resistors, and the principle is that the resistance change is caused by the change of temperature. But now, the thermal resistor has generally been industrialized, which is basically refers to the PT100, CU50 and other commonly used thermal resistors. The difference between these two kinds of resistance: the thermal resistance is generally refers to the metal thermal resistance (PT100, etc); Thermistor is a semiconductor thermal resistance. The temperature coefficient of semiconductor thermal resistance is more than 10 to 100 times as big as that of metal, and it can detect the temperature change of 10~6℃ and select the resistance value of 0.1 ~ 100kΩ. That is why the semiconductor thermal resistance is called thermistor. The thermistor is generally used in circuit boards. It can be used as a protective device because the resistance changes with the change of temperature. Of course, this is only one aspect. There are many other uses of thermistor. For example, thermistor is used for the temperature compensation of the cold end. However, because of the obvious nonlinear relationship between the resistance and temperature, the consistency of the elements is very poor and it can not have a standard signal as the heat resistance does.(more)
The NTC element is a negative temperature coefficient thermistor, which is widely used in radio production. This paper mainly introduces the applications of the following three aspects.(more)
TEC have both cooling and heating functions. Its working current is DC current, through changing the polarity of the direct current, the TEC can achieve cooling or heating.(more)
Thermistor is a resistor whose resistance value is very sensitive to temperature. It is also known as semiconductor thermistor. The main characteristics of thermistor is high sensitivity to temperature, small thermal inertia, long service life, small volume, simple structure, and various shapes, which has become the sensitive resistor used very widely.(more)
