Note image acquisition system

Patent metadata

Field	Value
Publication number	US-10121302-B2
Application number	US-201615579139-A
Country	US
Kind code	B2
Filing date	Mar 25, 2016
Priority date	Jun 26, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A note image acquiring system includes: 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. The note image acquiring system can improve resolution of details of a note image without needing to increase the number of photosensitive chip units per unit length of a linear array image sensor.

First claim

The invention claimed is:

1. 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.

2. The note image acquiring system according to claim 1 , wherein the fiber laser, the fiber beam splitter and the fiber collimator are connected via optical fibers to build a light path.

3. The note image acquiring system according to claim 1 , wherein the fiber laser is a wavelength-tunable fiber laser, and a laser generated by the fiber laser comprises a red light, a green light and a blue light.

4. The note image acquiring system according to claim 3 , wherein a wavelength of the red light is 700 nm, a wavelength of the green light is 546 nm, and a wavelength of the blue light is 436 nm.

5. The note image acquiring system according to claim 1 , wherein the fiber beam splitter is a 1×N fiber beam splitter configured to evenly divide a laser beam generated by the fiber laser into N parts;
the fiber collimator is a 1×N fiber collimator configured to transmit the evenly divided N parts of the laser beam to the laser beam expander; and
the laser beam expander is a 1×N laser beam expander configured to perform spatial expansion on the N parts of the laser beam.

6. The note image acquiring system according to claim 1 , wherein
the waveform generator is configured to generate the driving signal and send the driving signal to the signal amplifier;
the signal amplifier is configured to convert the driving signal into a voltage signal; and
the lithium niobate intensity modulator array is configured to perform two dimensional spatial modulation on a received laser signal based on the voltage signal.

7. The note image acquiring system according to claim 1 , wherein
after passing through the irradiating light path, the modulating light path and the reflecting light path sequentially, a laser signal is received by the optical signal receiving end of the line-array photosensitive chip; and
the line-array photosensitive chip is configured to convert the laser signal into the electrical signal.

8. The note image acquiring system according to claim 1 , wherein the fiber laser is configured to generate a vertically polarized laser signal.

9. The note image acquiring system according to claim 3 , wherein
the preliminary image corresponds to the laser signal corresponding to the electrical signal, and comprises a red light acquired image corresponding to the red light, a green light acquired image corresponding to the green light and a blue light acquired image corresponding to the blue light; and
the image combining module is configured to combine the red light acquired image, the green light acquired image and the blue light acquired image at a rate of 1:1:1 to generate the high resolution image of the to-be-detected note.

10. The note image acquiring system according to claim 1 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

11. The note image acquiring system according to claim 2 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

12. The note image acquiring system according to claim 3 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

13. The note image acquiring system according to claim 4 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

14. The note image acquiring system according to claim 5 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

15. The note image acquiring system according to claim 6 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

16. The note image acquiring system according to claim 7 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

17. The note image acquiring system according to claim 8 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

18. The note image acquiring system according to claim 9 , wherein a piece of transparent protective glass is arranged between the quarter-wave plate and the to-be-detected note.

Assignees

• Grg Banking Equipment Co Ltd

Inventors

• Jin Xiaofeng
• Liang Tiancai
• Gong Wenchuan
• Liu Jianping

Classifications

• G02B27/28 Primary

  for polarising (used in stereoscopes G02B30/25) · CPC title

• G07D7/205

  Matching spectral properties · CPC title

• G07D7/12

  Visible light, infrared or ultraviolet radiation · CPC title

• G02B27/283

  used for beam splitting or combining · CPC title

• G02B27/286

  for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34) · CPC title