Device and method for three-dimensional laser imaging with longitudinal range

A device for three-dimensional (3D) laser imaging with a longitudinal range, comprising at least:

• a pulse laser (1), a laser beam splitter (2), a laser emitting lens (3), a photodetector (4), an image processing unit (IPU) (5), a shutter control module (SCM) (6), an imaging lens (7), an optical filter (8), an electronically controlled shutter (9) and an optical sensor array (10), wherein the pulse laser (1), the laser beam splitter (2), the laser emitting lens (3), the photodetector (4), the IPU (5), the SCM (6), the imaging lens (7), the optical filter (8), the electronically controlled shutter (9) and the optical sensor array (10) are fixed in a housing;
• the pulse laser (1) and the imaging lens (7) are aligned with the imaging target (11), and the pulse laser (1) emits a first laser pulse to the imaging target (11) via the laser emitting lens (3);
• a region of the imaging target (11) closest to the imaging lens (7) reflects a part of light back to the imaging lens (7), and this part of light is imaged onto a plane of the optical sensor array (10) by the imaging lens (7) and the electronically controlled shutter (9);
• the IPU (5) controls the electronically controlled shutter (9) to shut off via the SCM (6), and the IPU (5) stores a first image of the region of the imaging target (11) closest to the imaging lens (7);
• the pulse laser (1) emits a second laser pulse to the imaging target (11) via the laser emitting lens (3);
• a region of the imaging target (11) closer to the imaging lens (7) reflects a part of light back to the imaging lens (7), and this part of light is imaged onto the plane of the optical sensor array (10) by the imaging lens (7) and the electronically controlled shutter (9);
• the IPU (5) controls the electronically controlled shutter (9) to shut off via the SCM (6), and the IPU (5) stores a second image of the region of the imaging target (11) closer to the imaging lens (7);
• the pulse laser (1) emits an N-th laser pulse to the imaging target (11) via the laser emitting lens (3);
• a region of the imaging target (11) farther to the imaging lens (7) reflects a part of light back to the imaging lens (7), and this part of light is imaged onto the plane of the optical sensor array (10) by the imaging lens (7) and the electronically controlled shutter (9);
• the IPU (5) controls the electronically controlled shutter (9) to shut off via the SCM (6), and the IPU (5) stores an N-th image of the region of the imaging target (11) farther to the imaging lens (7);
• the pulse laser (1) emits an (N+1)-th laser pulse to the imaging target (11) via the laser emitting lens (3);
• a region of the imaging target (11) farthest to the imaging lens (7) reflects a part of light back to the imaging lens (7), and this part of light is imaged onto the plane of the optical sensor array (10) by the imaging lens (7) and the electronically controlled shutter (9);
• the IPU (5) controls the electronically controlled shutter (9) to shut off via the SCM (6), and the IPU (5) stores an (N+1)-th image of the region of the imaging target (11) farthest to the imaging lens (7);
• the IPU (5) processes the stored images of different ranges to output an image of the imaging target (11) covering different regions of longitudinal ranges.