The first point is that photoelectric sensors and fiber optic sensors work differently
First of all, from the principle of operation of the two, first of all, the photoelectric sensor operates according to the principle of the photoelectric effect, that is, when the light hits the photoelectric sensor made of semiconductors, it will announce a phenomenon of photoelectrons, which can convert light energy into electrical energy. For example, photoresistors, photodiodes, and phototransistors, which are commonly used in light control occasions, are operated according to this effect. The optical fiber sensor operates through the principle of total reflection of light, and the principle of total reflection of light has been learned in middle school physics, for example, the Snell 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 the manufacturing materials of photoelectric sensors and optical fiber sensors are different
For example, the manufacturing materials of photodiodes and phototransistors generally include silicon materials or germanium materials, and the materials of photoresistors are made of cadmium sulfide or indium antimonide; 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 messy, and there are some messy peripherals as auxiliary control in addition to the optical fiber.
The fourth point is that the scale measured by photoelectric sensors and optical fiber sensors is different
The scale measured by photoelectric sensors is relatively small, and generally has light intensity, illumination, velocity and strain displacement. The scale of optical fiber sensor measurement is relatively wide, about 70 physical quantities can be measured, such as pressure, sensation, speed, current, temperature, flow, magnetic field, etc., so the future development of optical fiber sensor potential is huge, can be said to be the latecomer.
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