Gain compensation method for measuring fingertip blood glucose through difference method and detection device thereof

The invention discloses a gain compensation method and device for measuring fingertip blood glucose through a difference method, near-infrared light sensitive to blood glucose signals is selected as a dominant wavelength lambda a, near-infrared light insensitive to the blood glucose signals is selected as a background wavelength lambda b, two groups of blood glucose signals are obtained respectively, and the two groups of blood glucose signals are expressed as [A] and [B] respectively through time sequences; and setting a gain coefficient alpha to obtain a differential measurement value [C] = [B]-alpha [A] after gain compensation. By adopting the technical scheme, the influence of a non-blood glucose signal on a result is reduced through a differential method; a gain coefficient alpha is introduced, so that the influence of the difference of two signal driving circuits and near-infrared light with different wavelengths on the blood component absorption sensitivity difference is reduced, the interference is in