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    "Eleventh question, 11 answer" tells you how to use infrared photoelectric sensors for water quality

     

    Yes. Water is transparent to the light in the visible spectrum, so the photoelectric sensor of the standard visible light LED will be completely penetrated, and it is usually not used to detect an infrared LED having a wavelength of 1450 nm using a wavelength of 1450 nanometers. Water and many water quality liquids are effectively absorbed. If the human eye can see the color in the infrared spectrum, the wavelength 1450 nm will be displayed black. ...

     

     

     

     

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