Optical fiber sensor and photoelectric sensor are two typical sensors, which are widely used in production and measurement, so what is the difference between the two?
Optical fiber sensor skills are based on the development of optical fiber, optical communication and optoelectronic skills, electromagnetic disturbance and corrosion effects have little impact on it, it can adapt to a variety of harsh climatic environments, without the rated power supply for power supply, can be transmitted over long distances, is now the research hotspot of the sensor profession.
First, the principle
Photoelectric sensor: It is a sensor that uses a photoelectric element as a detection element. It first converts the measured change into a change in the optical signal, and then further converts the optical signal into an electrical signal with the help of optoelectronic components. Photoelectric sensors are generally composed of three parts: light source, optical path and optoelectronic components.
Optical fiber sensor: The light from the light source is sent to the modulator through the optical fiber, so that the parameters to be measured interact with the light entering the modulation area, resulting in the change of the optical properties of the light (such as the intensity, wavelength, frequency, phase, partial normality, etc.) of the light, which is called the modulated signal light, which is sent to the optical prospecter through the optical fiber, and the measured parameters are obtained after demodulation.
Second, the use of aspects
1. The application field of photoelectric sensor: the smoke and dust turbidity monitor to avoid industrial smoke and dust pollution is one of the important tasks of environmental protection. In order to eliminate industrial soot pollution, it is important to know the amount of soot emissions, so it is necessary to monitor the source of soot, proactively visualize and alarm for overspending. The soot turbidity in the flue is measured by the magnitude of the light that changes during the transport of light in the flue. If the turbidity of the flue is increased, the light emitted by the light source is absorbed and refracted by the soot particles, and the light reaching the light detector is reduced, so the strength of the output signal of the light detector can reflect the change of the turbidity of the flue.
the use of photocells in photoelectric detection and active control; When photocells are used for photoelectric exploration, their basic principles are the same as those of photodiodes, but their basic structures and manufacturing processes are not exactly the same. Because photocells do not require an applied voltage to work; It has been widely used in photoelectric readout, photoelectric coupling, grating ranging, laser collimation, film sound reproduction, ultraviolet light monitor and gas turbine flameout protection device.
2. The field of use of optical fiber sensors: insulator pollution, magnetism, sound, pressure, temperature, acceleration, gyroscope, displacement, liquid level, torque, photoacoustics, current and strain and other physical quantities.
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