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electrotherm sensors generally consist of 2 parts: the processing path and the processing element. The basic principle is based on the photoelectric effect, converting changes in the measured quantity into changes in optical signals, and then using photoelectric components to further convert non-electrical signals into electrical signals. The photoelectric effect refers to illuminating an object with light, which can be viewed as a stream of photons with specific energy bombarding the object. At this time, the photon energy is transferred to electrons, and the entire energy of one photon is absorbed by one electron at once. The electron gains the energy transferred by the photon.