1. The definitions are different
Photoelectric sensor: A photoelectric sensor is a device that converts optical signals into electrical signals. Its principle of operation is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light shines on certain substances, the electrons of the matter absorb the energy of photons and the corresponding electrical effect occurs.
Fiber Optic Sensor: A fiber optic sensor is a type of sensor that transforms the condition of a measured target into a measurable optical signal. The operating principle of the optical fiber sensor is to send the incident beam of the light source into the modulator through the optical fiber, and the interaction between the measured parameters in the modulator and the external environment changes the optical properties of the light, such as the intensity, wavelength, frequency, phase, polarization state, etc., to become the modulated optical signal, and then the optical fiber is sent to the optoelectronic device and the measured parameters are obtained after the demodulator.
2. The functions are different
Photoelectric sensor: the transient response scale is wide, the harmonic measurement can be strong, and the transient characteristics are an important parameter to determine whether a transformer can be used in the power system, especially with the relay maintenance action time. Due to the presence of iron cores, traditional electromagnetic transformers have poor response characteristics to high-frequency signals and cannot correctly reflect the transient process on the primary side. The frequency scale of the photoelectric transformer is mainly determined by the electronic circuit part, and there is no problem of iron core saturation, so it can accurately reflect the transient process on the primary side. Generally, it can be designed to 0.1 Hz to 1 MHz, and special can be designed to 200 MHz bandpass. The structure of the photoelectric sensor can measure the harmonics on the high-voltage power line. Electromagnetic induction transformers are difficult to achieve. Digital interface, communication can be strong, because the photoelectric sensor is transmitted down is the optical digital signal, and the communication network is easy to interface, and there is no measurement error in the transmission process. At the same time, with the widespread use of microcomputerized maintenance and control equipment, the photoelectric transformer can directly provide digital quantity to the secondary equipment, so that the converter and A/D sampling part in the original maintenance device can be omitted, so that the secondary equipment can be greatly simplified, and the discussion of new maintenance principles can be promoted. Small size, light weight, easy to upgrade, meet the requirements of substation miniaturization and compactness, because the photoelectric sensor is relying on the sensor head and electronic circuit for signal acquisition and processing, small size, the component is generally below 1000 kg, easy to integrate in AIS or GIS, which will greatly reduce the footprint of the substation, and meet the requirements of miniaturization and compactness of the substation. At the same time, the photoelectric transformer is connected to the secondary equipment through a small number of optical cables, which can greatly reduce the cable trench and cable.
Optical fiber sensor: optical fiber has many excellent functions, such as: it has the function of resisting electromagnetic and atomic radiation disturbance, and the mechanical function of thin diameter, soft weight and light weight; Insulated, inductive-free electrical functions; Water-resistant, high-temperature resistant, corrosion-resistant, etc., It can play the effect of human ears and eyes in places that people cannot reach, or areas that may be harmful to people (such as nuclear radiation areas), and can also cross people's physiological boundaries and receive external information that cannot be felt by people's senses.
3. Use differently
Photoelectric sensor: The photoelectric sensor with photoelectric components as the sensitive element has a wide variety and a wide range of uses. According to the nature of the output of the photoelectric sensor, it can be divided into two categories: the photoelectric measurement instrument made by converting the measured into a continuously changing photocurrent, which can be used to measure the intensity of light and the physical quantities such as temperature, light transmittance, displacement and appearance condition of the object. For example: illuminance meter to measure light intensity, photoelectric pyrometer, photoelectric colorimeter and turbidity meter, photoelectric alarm to prevent fire, automatic detection devices and instruments for checking the diameter, length, ovality and surface roughness of the processed parts, and the sensitive components are all optoelectronic components. Semiconductor optoelectronic components are not only widely used in the civilian industry, but also have an important position in the military. For example, lead sulfide photoresistors can be used to make infrared night vision devices, infrared cameras and infrared navigation systems; I convert the measured photocurrent into a photocurrent that continues to change. A variety of photoelectric automatic devices made of optoelectronic components with or without the characteristics of electrical signal output when exposed to or without light. The optoelectronic element is used as a switching photoelectric conversion element. For example, the photoelectric input of the electronic computer, the switching temperature conditioning device and the speed measurement digital photoelectric speedometer.
Fiber optic sensors: the use of dry and gyroscope and grating pressure sensors for bridges, dams, oil fields, etc. in urban construction. Fiber optic sensors can be embedded in concrete, carbon fiber reinforced plastics, and a variety of composite materials to test stress relaxation, construction stress, and dynamic load stresses, and then evaluate the structural function of the bridge during the short-term construction phase and long-term operation. In the power system, it is necessary to measure temperature, current and other parameters, such as the temperature detection in the stator and rotor of high-voltage transformers and large motors, because electrical sensors are easily disturbed by electromagnetic fields and cannot be used in such occasions, so optical fiber sensors can only be used.
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