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source:Industry News release time:2022-01-12 Hits: Popular:Infrared sensing module
The first point is that the working principles of RF sensors and fiber optic sensors are different
First of all, from the working principle of the two, first of all, let's talk about the radio frequency sensor. It works according to the principle of photoelectric effect, that is to say, when light is irradiated on the radio frequency sensor made of semiconductor, it will emit photoelectrons. , Can convert light energy into electrical energy. For example, photoresistors, photodiodes, and phototransistors, which are often used in light control occasions, all work according to this effect. The optical fiber sensor works by the principle of total reflection of light. The principle of total reflection of light has been learned in middle school physics. For example, Snell's law of light refraction and reflection clearly expresses the principle of light reflection with mathematical relations. . Therefore, we can use the light transmission characteristics of the optical fiber to convert the measured light into a change in light characteristics, such as changing the frequency, wavelength, intensity, and phase of the light.
The second point is that the radio frequency sensor and the fiber optic sensor are made of different materials
Radio frequency sensors are mainly made of semiconductor materials or metal materials with photoelectric effect. For example, photodiodes and phototransistors are generally made of silicon or germanium materials, and photoresistors are made of materials such as cadmium sulfide or indium antimonide. Production; The optical fiber sensor is composed of glass fiber (mainly made of quartz glass) with high light transmittance, and the composition is relatively single.
The third point is that the structure of RF sensors and fiber optic sensors is different
The radio frequency sensor is relatively simple. For example, a photodiode is composed of pins, housing, die, and glass condenser. The structure of fiber optic sensors is relatively complicated, and in addition to optical fibers, there are some complex peripherals as auxiliary controls.
The fourth point is that the measurement ranges of RF sensors and fiber optic sensors are different
The measurement range of the radio frequency sensor is relatively small, generally including light intensity, illuminance, speed and strain displacement, etc.; while the measurement range of the optical fiber sensor 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 future development of optical fiber sensors has a huge potential, and it can be said that the latecomers dominate.
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