Note image acquisition system

A note image acquiring system, comprises:

• a fiber laser,
• a fiber beam splitter,
• a fiber collimator,
• a laser beam expander,
• a lithium niobate intensity modulator array,
• a waveform generator,
• a signal amplifier,
• a polarization beam splitter,
• a quarter-wave plate,
• an imaging lens group,
• a line-array photosensitive chip,
• an image information processing module, and
• an image combining module, wherein
• the fiber laser, the fiber beam splitter, the fiber collimator and the laser beam expander are sequentially aligned to build an irradiating light path;
• a distal end of the irradiating light path falls onto an optical signal receiving end of the lithium niobate intensity modulator array;
• an optical signal sending end of the lithium niobate intensity modulator array, the polarization beam splitter and the quarter-wave plate are sequentially aligned to build a modulating light path, a distal end of the modulating light path falls onto a to-be-detected note;
• the to-be-detected note, the quarter-wave plate and the polarization beam splitter are sequentially aligned to build a reflecting light path, the reflecting light path is sent by the polarization beam splitter into the imaging lens group;
• the reflecting light path falls onto an optical signal receiving end of the line-array photosensitive chip via the imaging lens group;
• the waveform generator is connected to the signal amplifier, the signal amplifier is connected to the lithium niobate intensity modulator array;
• the image information processing module is connected to the line-array photosensitive chip, the image combining module and the waveform generator, and is configured to obtain a driving signal generated by the waveform generator and an electrical signal acquired by the line-array photosensitive chip, and rebuild a preliminary image of the to-be-detected note based on the driving signal and the electrical signal;
• and
• the image combining module is configured to combine a plurality of the preliminary images to obtain a high resolution image of the to-be-detected note.