Eye-safe multi-beam photon counting laser imaging method
An eye-safe, photon counting technology, applied in the field of laser imaging, can solve the problems of high price, low laser energy, and high technical difficulty, and achieve the effects of reducing equipment cost, simplifying system structure, and ensuring echo rate
Pending Publication Date: 2020-08-11
EAST CHINA NORMAL UNIV
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Problems solved by technology
Multi-beam photon counting laser imaging systems usually use single-photon detector arrays as the signal detection end, which is technically difficult and expensive
Moreover, the energy of lasers in the eye-safe band is generally low, and laser amplifiers are needed to achieve long-distance imaging. Using multiple laser amplifiers to amplify multiple beams will greatly increase the system cost
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[0021] Example: as figure 2 As shown, the specific multi-wavelength multi-beam photon counting laser imaging method in this embodiment uses pulsed lasers with different wavelengths, random phases and unequal repetition frequencies as the laser source, and uses a diffraction grating to form a multi-beam spatial distribution structure , obtain a multi-wavelength multi-beam pulsed laser, and scan the imaging target. The echo photons are received through the same diffraction grating to form a coaxial optical path, which is coupled into a single-pixel single-photon detector as the detection end to simultaneously detect the echo signals of multiple beams. Thereby, the point cloud data of the distance to the imaging target can be calculated, and the laser 3D imaging can be realized.
[0022] like figure 1 As shown, the multi-wavelength multi-beam photon counting laser imaging method in this embodiment includes the following steps:
[0023] (1) Using a laser emitting device to emi...
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The invention relates to the technical field of laser imaging, in particular to an eye-safe multi-beam photon counting laser imaging method. Multi-wavelength laser pulses safe to human eyes are generated through a laser generating device, multi-wavelength laser pulse energy is simultaneously amplified by a laser amplifier, and a diffraction grating is used for splitting the energy-amplified multi-wavelength laser pulses to generate a multi-beam spatial distribution structure; an imaging target is scanned through the obtained multi-wavelength multi-beam laser pulses; and multi-wavelength multi-beam echo signals received by using the same diffraction grating are analyzed through a time-dependent single photon coincidence counting module to obtain flight time of the multi-wavelength multi-beam laser pulse so as to calculate the distance of each scanning position on the imaging target, thereby constructing a three-dimensional image of the imaging target. The method has the advantages thateye-safe laser pulses with different wavelengths, random phases and unequal repetition frequencies are used as a laser source, and only one laser amplifier is used for amplifying multi-beam laser energy.
Description
technical field [0001] The invention relates to the technical field of laser imaging, in particular to an eye-safe multi-beam photon counting laser imaging method. Background technique [0002] Photon counting laser imaging technology has broad application prospects in terrain mapping, urban 3D modeling, underwater imaging and other fields. Among them, eye-safe multi-beam photon-counting laser imaging has fast imaging speed, small ranging error, and eye safety. The advantages are an important direction for the development of laser imaging systems at present. The multi-beam photon counting laser imaging system usually uses a single photon detector array as the signal detection end, which is technically difficult and expensive. Moreover, lasers in the eye-safe band generally have low energy, and laser amplifiers are required to achieve long-distance imaging. Using multiple laser amplifiers to amplify multiple beams will greatly increase the system cost. SUMMARY OF THE INVEN...
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IPC IPC(8): G01J1/44
CPCG01J1/44G01J2001/442
Inventor 吴光郑天翔李召辉申光跃
Owner EAST CHINA NORMAL UNIV