The photoelectric detection method has the advantages of high precision, fast response, non-contact, etc. The sensor has a simple structure, a flexible form and a small volume. In recent years, with the development of optoelectronic technology, photoelectric sensors have become a series of products, and their varieties and output are increasing, and they are widely used in various light industrial automata. Typical cases are as follows:
(1) Soot turbidity monitor
Preventing industrial soot pollution is one of the important tasks of environmental protection. In order to eliminate industrial soot pollution, we must first know the amount of soot emissions, so we must monitor, automatically display and exceed the standard alarm. The turbidity of the soot in the flue is detected by the magnitude of the change in the transmission of light through the flue. If the turbidity of the flue increases, the light emitted by the light source is increased by the absorption and refraction of the soot particles, and the light reaching the photodetector is reduced, so that the intensity of the output signal of the photodetector can reflect the change in the turbidity of the flue.
(2) Photoelectric speed sensor
A rotating plate with a hole is fixed on the rotating shaft to be tested, and a constant light is generated by an incandescent lamp on the side of the adjusting plate, and reaches a photoelectric converter composed of a photodiode through a small hole in the disk, and is converted into a corresponding electric pulse signal. After the amplification shaping circuit outputs a neat pulse signal, the rotation speed is determined by the pulse frequency.
(3) Photocell
When photocells are used as photodetectors, the basic principle is the same as that of photodiodes, but their basic structure and manufacturing process are not identical. Since the photovoltaic cell does not require an applied voltage, high photoelectric conversion efficiency, wide spectral range, good frequency characteristics, low noise, etc., it has been widely used for photoelectric readout, photoelectric coupling, grating ranging, laser collimation, and film reverberation. , UV monitors and gas turbine flameout protection devices.
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