Analysis of the structure and performance principle of fiber optic sensors

Fiber optic sensors, as the name suggests, are sensors that transmit signals over fiber optics. Let's take a look at what it looks like.

1 Introduction

Fiber optic sensors are a new type of sensor that has evolved along with the development of fiber optic and fiber optic communication technologies. The fiber optic sensor is corrosion resistant, has little influence on the medium, and has strong anti-electromagnetic interference capability. Compared with the traditional sensors, the optical fiber sensor uses light as a carrier for sensitive information, and uses optical fiber as a medium for transmitting sensitive information, and has an optical fiber. And the characteristics of optical measurement, this new technology has been widely used in many fields in China in recent years.

2. Composition

There are three basic components of a fiber-optic sensor network. One of them is a single-point sensor, which means that one fiber plays only a role here. The other is a multi-point sensor, where a fiber bundles many sensors. Such a large number of sensors can share the light source for network monitoring; and then there is an intelligent fiber sensor.

3. Principle

The basic working principle of the fiber sensor is: firstly, the light from the light source is sent to the modulator through the optical fiber, so that the parameters to be measured and the light entering the modulation area interact to cause optical properties of the light (such as the intensity, wavelength, frequency of the light, A certain change occurs in the phase and the polarization state, etc., which is called modulated signal light, and then sent to the photodetector through the optical fiber, and the measurement is performed by the influence of the measured transmission characteristics of the light, and the measured parameter is obtained.

4. Performance

Optical fiber has many excellent properties, such as: resistance to electromagnetic and atomic radiation interference, mechanical properties with fine diameter, softness and light weight; electrical properties of insulation and non-induction; chemical properties resistant to water, high temperature and corrosion It can function in people's ears, or in areas that are harmful to people (such as nuclear radiation areas), and can also transcend human physiological boundaries, which are not felt by the recipient's senses. External information.