Like traditional ultraviolet-visible and infrared spectrometers, near-infrared spectrometers also consist of optical, electronic, mechanical, and computer systems. Among them, the electronic system is composed of light source power circuit, detector power circuit, signal amplification circuit, A/D conversion, control circuit, and other parts. The computer system is connected to the circuits of the optical and mechanical systems via an interface, which is mainly used to operate and control the operation of the instrument and is also responsible for the acquisition, processing, storage, and display of spectral data.