Polarizer
From high school physics, we have understood the volatility of light. The direction of light waves is perpendicular to the electric field and magnetic field. At the same time, the electric field and magnetic field components of the light wave are also perpendicular to each other. In other words, the direction of travel and the components of the electric and magnetic fields are parallel to each other. The polarizer acts like a fence, blocking components perpendicular to the fence and allowing only components parallel to the fence to pass through. So if we take a polarizing plate and look at the light source, it will feel like wearing sunglasses, and the light becomes darker. But if two polarizers are stacked together, it will be different. When you rotate the relative angle of two polarizers, you will find that the brightness of the light will become darker and darker as the relative angle is different. When the fence angles of the two polarizers are perpendicular to each other, the light cannot pass at all. The liquid crystal display is completed by using this feature. The polarizing plates between the upper and lower fences are perpendicular to each other, filled with liquid crystal, and then the electric field is used to control the rotation of the liquid crystal to change the direction of light travel. In this way, different electric field sizes, It will form different gray scale brightness.
Explosion Proof Temperature Sensor
The model of explosion-proof temperature sensor is wzpk-22i-b, which is made of stainless steel and has explosion-proof performance. If you want to conduct reliable temperature measurement, you first need to select the correct temperature instrument, that is, the temperature sensor. Thermocouple, thermistor, platinum resistance (RTD) and temperature IC are the most commonly used temperature sensors in testing.
The changes of physical parameters with temperature include expansion, resistance, capacitance, electromotive force, magnetic properties, frequency, optical characteristics, thermal noise and so on. With the development of production, new temperature sensors will continue to emerge.
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