Photoelectric sensor and what is the difference between optical fiber sensor
what are the difference between fiber optic sensors and photoelectric sensors as the two typical sensors, its application in production of measurement is more extensive, so what is the difference between the two? Below we from two aspects of principle and its application to analyze the difference.
a, principle of
1) Photoelectric sensor, photoelectric element is used as the detecting element of sensor. It first of all, the measured changes into the change of the optical signal, and then with the help of a photoelectric element further converts light signals into electrical signals. Photoelectric sensor generally consists of light source, optical path and photoelectric device of three parts.
2) : sensor is to light through the from the light source to the modulator, the parameters under test and after entering modulation OuDeGuang interaction, leads to the optical properties of the light ( As the light intensity, wavelength, frequency, phase and skewed normal, etc. ) Change, is called a modulated signal light, after fiber into light detector, after demodulation, obtain the parameter being measured. Second, the applications
1) Photoelectric sensor applications
1, the smoke turbidity monitor
prevent industrial dust pollution is one of the important tasks of environmental protection. In order to eliminate industrial soot pollution, the first thing to know that the soot emissions, so have to smoke source monitoring, automatic display and alarm. Flue dust turbidity is made by light transmission in the process of change in flue size to test. If the flue turbidity increases light source the light is absorbed by dust particles and refraction increased, arrived in the light of the optical detector to reduce, thus the strength of the optical detector output signal can reflect the change of the flue turbidity.
2, photovoltaic applications in photoelectric detection and automatic control
photovoltaic cells used as photoelectric detection, its basic principle is the same as the photosensitive diode, but they are not completely the same basic structure and manufacturing process. Because the photocell at work do not need to be applied voltage; The photoelectric conversion efficiency is high, wide spectral range, good frequency characteristics, low noise, it is widely used in photoelectric sensing range finding, laser collimation, photoelectric coupling, grating, movies and sound, uv monitor and gas turbine flame-out protection devices, etc.
2) fiber optic equipment sensor applications
insulator grubby, magnetic, acoustic, pressure, temperature, displacement, acceleration, gyroscope, liquid level, torque, light, and physical quantities such as current and strain measurement.
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