MEMS sensor (Microelectro Mechanical Systems) refers to an industrial technology that combines microelectronic circuit technology with micromechanical systems. Its internal structure is generally in the order of micrometers or even nanometers. Simply put, MEMS is to miniaturize the mechanical components of traditional sensors, and then fix the device on the silicon wafer through three-dimensional stacking technology, such as three-dimensional through-silicon TSV technology, and finally adopt special customized packaging forms according to different applications. Cut and assembled.

The so-called capacitor is actually two conductors that are close to each other, with a non-conductive insulating medium sandwiched between them, forming a capacitor. A capacitor stores charge when a voltage is applied between its two plates.

Liquid level sensor (hydrostatic level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a pressure sensor that measures liquid level. The static pressure input liquid level transmitter (liquid level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid.

In September 2020,China made a solemn commitment to the international community at the United Nations General Assembly that China will reach its carbon emission peak of 11.6 billion tons in 2030, that is, carbon peaking.

Some electronic devices require an AC signal with a highly stable frequency, while the LC oscillator has poor stability and unstable frequency (the frequency of the generated AC signal is easy to change). A special component is used in the oscillator, a quartz crystal, which can generate a highly stable signal. This oscillator using a quartz crystal is called a crystal oscillator (crystal oscillator).