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Supercontinuum Illumination Space Gate Ballistic Light Imaging Device and Method

A supercontinuum and optical imaging technology, applied in measurement devices, spectrometry/spectrophotometry/monochromator, spectrum investigation, etc. Speckle, the effect of suppressing the formation of speckle

Active Publication Date: 2020-04-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Furthermore, in a strong scattering environment, especially when the optical depth is greater than 10, even if the speckle is suppressed, the imaging contrast is reduced because the scattered light is not filtered out and accepted by the detector

Method used

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  • Supercontinuum Illumination Space Gate Ballistic Light Imaging Device and Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the identification rate plate hidden in polystyrene microsphere suspension with an optical depth (OD) of 9 is used as the sample to be tested. ) as the sample to be tested. The pattern on the identification rate board includes several groups of three short lines, the size of which is from large to small. This test pattern is widely used in testing the resolution of optical imaging systems (such as microscopes and cameras). This simulates the ability of supercontinuum lighting to image hidden objects in a large number of scattering environments. The specific implementation steps are as follows:

[0048] 1) The energy of a single pulse emitted by the femtosecond laser is 3mJ, the pulse width is 50fs, and the femtosecond pulse laser output by the amplifier with a repetition rate of 1kHz is irradiated onto the resolution plate.

[0049] 2) After the supercontinuum is modulated by the object to carry the shape information of the target to be measu...

Embodiment 2

[0055] In this embodiment, the identification rate plate hidden in polystyrene microsphere suspension with OD=11 is used as the sample to be tested, and the ability of ballistic light imaging combined with supercontinuum illumination and spatial filtering to image hidden objects in a large number of scattering environments is simulated. The discriminative rate plate was as described in Example 1. The specific implementation steps are as follows:

[0056] 1) The energy of a single pulse emitted by the femtosecond laser is 3mJ, the pulse width is 50fs, and the femtosecond pulse laser output by the amplifier with a repetition rate of 1kHz is irradiated onto the resolution plate.

[0057] 2) After the supercontinuum is modulated by the object to carry the shape information of the target to be measured, it passes through the suspension of polystyrene beads with a diameter of 3.13 μm. The thickness of the suspension was 1 cm.

[0058] 3) The light emitted from the suspensi...

Embodiment 3

[0066] In this embodiment, the identification rate plate hidden in polystyrene microsphere suspension with OD=17 is used as the sample to be tested, and the ability of supercontinuum illumination combined with spatial filtering ballistic light imaging to image hidden objects in a large number of scattering environments is simulated. The discriminative rate plate was as described in Example 1. The specific implementation steps are as follows:

[0067] 1) The energy of a single pulse emitted by the femtosecond laser is 3mJ, the pulse width is 50fs, and the femtosecond pulse laser output by the amplifier with a repetition rate of 1kHz is irradiated onto the resolution plate.

[0068] 2) After the supercontinuum is modulated by the object to carry the shape information of the target to be measured, it passes through the suspension of polystyrene beads with a diameter of 3.13 μm. The thickness of the suspension was 1 cm.

[0069] 3) The light emitted from the suspension i...

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Abstract

The invention provides a trajectory light imaging device and method combining ultra-continuous spectrum illumination and space doors. A lens 1, water, a lens 2, an imaging target object, a lens 3, a space filter, a lens 4 and a CCD are successively arranged on an imaging optical path. The ultra-continuous spectrum illumination restrains speckles to allow the speckles to become uniform noise back bases. The direct space door gating trajectory light imaging is achieved by using a low-pass filter to filter scattered light noise. In the direct space door gating trajectory light imaging, by use of a high-pass filter, the noise back bases can be obtained, and then the ultra-continuous spectrum illumination is used to subtract the noise back bases to extract the trajectory light imaging result. The imaging method comprises steps of focusing femtosecond laser into water to generate ultra-continuous spectrums; using the ultra-continuous spectrums to carry out illumination; and using the space filtering technology to achieve gating trajectory light imaging. The device and the method are characterized in that the optical path is simple and the imaging contrast ratio is high, and the roundabout space door is characterized by high resolution.

Description

technical field [0001] The invention belongs to the technical field of ultra-fast imaging and measurement, and relates to a supercontinuum lighting space gate ballistic light imaging device and method. Background technique [0002] The development of ultra-fast imaging and measurement technology has important application value in the field of transient process research such as high-speed collision, high-speed flow field, high-voltage discharge, and visual mechanism. Generally, photoelectric technology can be used to achieve high time-resolution imaging from milliseconds to sub-picoseconds. However, in the fields of molecular structure dynamics, ultra-fast surface vibration processes, and extreme time-resolved fluorescence microscopy imaging, faster time-resolution capabilities must be used. Ultrafast pulse photonic imaging. [0003] When using ultra-short pulses as the illumination source to achieve ultra-fast imaging and measurement, the stray light of the imaging system o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/28G01J3/42
CPCG01J3/2823G01J3/42G01J2003/423
Inventor 谭文疆郑益朋司金海赵哲马骏刘晓晶
Owner XI AN JIAOTONG UNIV
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