The basic working principle of the optical fiber sensor is to send the optical signal from the light source to the modulator through the optical fiber, so that the measured parameter interacts with the light entering the modulation area, resulting in the optical properties of the light (such as light intensity, wavelength, frequency, phase) The polarization state, etc.) changes to become a modulated signal source, which is sent to a photodetector through an optical fiber and is demodulated to obtain a measured parameter.
Fiber Optic Sensor
Sensors are moving in the direction of sensitivity, precision, adaptability, compactness and intelligence. In this process, new members of the family of fiber-optic sensor sensors have become popular. Optical fiber has many excellent properties, such as: anti-electromagnetic and atomic radiation interference performance, fine diameter, soft, light weight mechanical properties; insulation, non-inductive electrical properties; water resistance, high temperature resistance, corrosion resistance, chemical properties, etc. It can act as an ear for people in places that people cannot reach (such as high temperature areas) or areas that are harmful to people (such as nuclear radiation areas), and it can also exceed the physiological limits of human beings and receive human senses. Unexpected outside information.
The basic working principle of the fiber optic sensor is to send light from the light source to the modulator through the fiber, so that the measured parameter interacts with the light entering the modulation area, resulting in the optical properties of the light (such as light intensity, wavelength, frequency, phase, The change in polarization state, etc., is called modulated signal light, and measurement is performed using the influence of the measured light transmission characteristics.
Optical fiber sensors have two measuring principles:
First, the principle of physical-type optical fiber sensor, physical-type optical fiber sensor is the use of optical fiber sensitivity to environmental changes, the input physical quantity into a modulated optical signal. Its working principle is based on the optical modulation effect of the optical fiber, that is, when the optical fiber changes in external environment factors such as temperature, pressure, electric field, magnetic field, etc., its light transmission characteristics, such as phase and light intensity, will change.
Therefore, if the phase and intensity of the light passing through the fiber can be measured, the change in the measured physical quantity can be known. This type of sensor is also known as a sensitive element type or functional fiber sensor. The point source light beam of the laser is diffused into parallel waves, and is divided into two paths by the beam splitter. One is a reference light path and the other is a measuring light path. The external parameters (temperature, pressure, vibration, etc.) cause changes in the length of the optical fiber and phase changes in the optical phase, resulting in a different number of interference fringes, counting its movement in the die, you can measure the temperature or pressure.
Second, the structure of the principle of optical fiber sensors, optical fiber sensor structure is composed of optical detection components (sensors) and optical fiber transmission circuit and measurement circuit composed of measurement systems. Wherein the optical fiber only serves as a light propagation medium, it is also called a light-transmitting or non-functional optical fiber sensor.
The application of fiber optic sensors is very wide. The famous sensor online shopping network imported from Canada is suitable for hard-to-reach locations and hazardous environments such as fiber-optic displacement sensors containing measurements in explosive materials - FOD, built-in safety for medical applications Medical fiber temperature sensor with high precision and high reliability - FOT-M, fiber optic strain sensor for civil engineering applications such as monitoring of dams, bridges, tunnels and other structures - SFO- W.
Optical fiber has many excellent properties, such as: anti-electromagnetic and atomic radiation interference performance, fine diameter, soft, light weight mechanical properties; insulation, non-inductive electrical properties; water resistance, high temperature resistance, corrosion resistance, chemical properties, etc. It can play the role of human ears where people cannot reach people or where it is harmful to humans (such as nuclear radiation areas). It can also exceed the physiological limits of human beings and can not be perceived by human senses. Outside information.
Optical fiber sensor features:
1. Due to the use of a prism in the reflector, the detection performance is higher and more reliable than that of a general-purpose reflective optical sensor.
2. The circuit connection is simpler and easier than the discrete optical sensor.
3. Snap button embedded design, installation is more simple.
The advantages of fiber-optic sensors are that optical fiber sensors use light as a carrier for sensitive information, and optical fibers as medium for transmitting sensitive information have the characteristics of optical fiber and optical measurement, and have a series of unique advantages. Good electrical insulation, anti-electromagnetic interference, non-invasive, high sensitivity, easy to implement remote monitoring of the signal under test, corrosion resistance, explosion-proof, flexible optical path, easy to connect with the computer.
Sensors are developed in the direction of sensitivity, precision, adaptability, compactness and intelligence. They can serve as the eyes and ears of people where people cannot reach people (such as high temperature areas or areas that are harmful to people, such as nuclear radiation areas). It can also work beyond the physiological limits of human beings and receive external information that people's senses do not feel.
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