Optical fiber sensors and photoelectric sensors are two typical sensors, which are widely used in production and measurement, so what is the difference between the two? Next, we will analyze the differences between the two from the perspective of principle and use.
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 optical properties of the light (such as the intensity, wavelength, frequency, phase, partial normal, etc.) of the light change, called the modulated signal light, after the optical fiber is sent to the optical prospecter, after demodulation, the measured parameters are obtained.
Second, the use of aspects
1. The application field of photoelectric sensor:
Smoke and dust turbidity monitor: Preventing industrial smoke pollution is one of the important tasks of environmental protection. In order to eliminate industrial soot pollution, it is necessary to know the amount of soot emissions, so it is necessary to monitor, actively display and alarm the source of soot. The soot turbidity in the flue is measured by the magnitude of the change in the transmission of light in the flue. If the turbidity of the flue is added, 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 the photocell does not need an external voltage to operate; It has been widely used in photoelectric readout, photoelectric coupling, grating ranging, laser collimation, film sound reproduction, ultraviolet light monitor and flameout protection device for gas turbines.
2. Optical fiber sensor application field:
Measurement of physical quantities such as insulator pollution, magnetism, sound, pressure, temperature, acceleration, gyroscope, displacement, liquid level, torque, photoacoustics, current and strain.
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