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1. By comparing the absorbed wavelength and some non-absorbed wavelength signals, the absorption amount is obtained. Near-infrared light of different wavelengths is projected onto the test material through a near-infrared filter. Each filter is Generates two beams, internal and external. The external beam is collected by the dome mirror and projected to the photodetector. The internal beam is only the optical path inside the instrument, which plays a role in stabilizing compensation.2. These signals can form an algorithm and output the results according to the ratio. After calibration, a measured reading will be directly output to achieve the monitoring effect.