The first point is that photoelectric sensors and fiber optic sensors work differently
First of all, from the working principle of the two, first of all, the photoelectric sensor works according to the principle of the photoelectric effect, that is to say, when the light shines on the photoelectric sensor made of semiconductors, it will emit photoelectrons, which can convert light energy into electrical energy. For example, photoresistors, photodiodes and phototransistors, which are commonly used in photocontrol occasions, all work according to this effect. The optical fiber sensor works through the principle of total reflection of light, and the principle of total reflection of light has been learned in middle school physics, such as Snell's law of light refraction and reflection is clearly expressed in mathematical relations. Therefore, we can use the light transmission characteristics of optical fibers to convert the measured into changes in light characteristics, such as changing the frequency, wavelength, intensity and phase of light.
The second point is that photoelectric sensors and optical fiber sensors are made of different materials
The manufacturing materials of photoelectric sensors are mainly semiconductor materials or metal materials with photoelectric effect, such as silicon materials or germanium materials for photodiodes and phototransistors, and materials for photoresistors are made of cadmium sulfide or indium antimonide and other materials; The optical fiber sensor is composed of glass fiber (mainly made of quartz glass) with high light transmittance, and the composition is relatively simple.
The third point is that the structure of photoelectric sensors and optical fiber sensors is different
Photoelectric sensors are relatively simple, for example, photodiodes are composed of pins, shells, cores and glass condensers; The structure of the optical fiber sensor is relatively complex, and there are some complex peripherals as auxiliary control in addition to the optical fiber.
The fourth point is that the measurement range of photoelectric sensors and fiber optic sensors is different
The range measured by photoelectric sensors is relatively small, generally including light intensity, illuminance, velocity and strain displacement. whereas
The range of measurement of optical fiber sensors is relatively wide, and it can measure more than 70 physical quantities, such as pressure, vibration, speed, current, temperature, flow, magnetic field, etc., so the potential of optical fiber sensors for future development is huge, and it can be said that the latecomers are superior.
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