The sensor is a detecting device that can sense the measured information and can transform the sensed information into an electrical signal or other required form of information output to meet the information transmission, processing, storage and display. Requirements for recording, control and control.

The fiber laser uses a rare earth doped fiber as the gain medium, and the pump light forms a high power density in the core, resulting in a "particle number reversal" of the doped ion level. When a positive feedback loop (constituting a resonant cavity) is properly added, A laser output is produced.

The fiber optic temperature sensor is a sensing device that analyzes the spectrum of the fiber transmission to understand the real-time temperature by using the principle that the spectrum absorbed by some substances changes with temperature.

The pressure sensor has a measuring range that is twice as large as an inductive sensor. Not only can metal targets be detected, but also dielectrics such as paper, glass, wood and plastic, and even wall or paper. There are also trembling measurements and burglar alarms for humans, since the human body is equivalent to an electrical conductor at low frequencies.

With the rapid development of the Internet, the demand for network bandwidth by network users is increasing. In order to meet the needs of the market, the backbone of the communication network has undergone tremendous changes, and the traditional access network, which has been changing little, has become a bottleneck in the entire network, and various new broadband access techn...

The structure of the fiber Bragg grating sensing system is analyzed. The functions of three different light source LEDs, LDs and erbium-doped light sources used in the fiber Bragg grating sensing system are analyzed. The operating principle of the FBG sensor and various temperature and stress are described. The difference measurement method describes several commonly used signa...

The electrical components that the pressure transmitter feels pressure are generally resistance strain gauges, which are sensitive devices that convert the pressure on the device under test into an electrical signal. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. The metal resistance strain gauge has two kinds o...

Correcting humidity is much more difficult than correcting the temperature. Temperature calibration often uses a standard thermometer as a standard, and the calibration standard of humidity is difficult to achieve. Dry and wet bulb thermometers and some common pointer hygrometers cannot be used for calibration, and accuracy cannot be guaranteed because of their requirements. Th...