Single-shot compressed optical-streaking ultra-high-speed photography method and system

Patent metadata

Field	Value
Publication number	US-12244952-B2
Application number	US-202017310037-A
Country	US
Kind code	B2
Filing date	Jan 29, 2020
Priority date	Jan 30, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

A system and a method for single-shot compressed optical-streaking ultra-high-speed imaging, the system comprising a spatial encoding module spatially encoding the transient event with a binary pseudo-random pattern into spatially encoded frames; a galvanometer scanner temporally shearing the spatially encoded frames; and a CMOS camera receiving the temporally sheared spatially encoded frames, during one exposure time of the camera, for reconstructing the transient event. The method comprises spatial encoding a transient event; temporal shearing resulting spatially encoded frames of the event, spatio-temporal integration, and reconstruction.

First claim

The invention claimed is:

1. A system for single-shot compressed optical-streaking ultra-high-speed imaging, comprising:
a spatial encoding module;
a galvanometer scanner; and
a CMOS camera;
wherein said spatial encoding module is configured for spatially encoding the transient event with a binary pseudo-random pattern, yielding spatially encoded frames, said galvanometer scanner temporally shearing the spatially encoded frames of the transient event, and said CMOS camera receiving the temporally sheared spatially encoded frames, in one exposure of the camera, for reconstructing the transient event.

2. The system of claim 1 , comprising a function generator, said function generator synchronizing rotation of the galvanometer scanner and the exposure of the camera.

3. The system of claim 1 , comprising an optical relay module relaying the image from the transient event to the CMOS camera.

4. The system of claim 1 , wherein said spatial encoding module has a fixed ±12° flipping angle and about 1 Mega pixel count.

5. The system of claim 1 , wherein said spatial encoding module is a spatial light modulator.

6. The system of claim 1 , wherein said spatial encoding module is one of: i) a digital micromirror device ad ii) a printed physical mask with an encoding pattern.

7. The system of claim 1 , wherein said galvanometer scanner is placed at the Fourier plane of a 4f system of an optical relay module between the transient event and the CMOS camera.

8. The system of claim 1 , wherein said galvanometer scanner temporally shears the spatially encoded frames linearly to different spatial locations along an axis of the camera according to their time of arrival.

9. The system of claim 1 , wherein said galvanometer scanner is selected with a rotation frequency per second in a range between 1 and 160, and an angle step response of about 200 μs.

10. The system of claim 1 , wherein said galvanometer scanner is selected with a rotation frequency per second in a range between 15 and 25 and an angle step response of about 200 μs.

11. The system of claim 1 , wherein said CMOS camera has a frame rate, synchronizing with the galvanometer scanner, in a range between 1 and 160 per second, and a Mega pixel count.

12. The system of claim 1 , wherein said CMOS camera, synchronizing with the galvanometer scanner, has a frame rate per second in a range between 15 and 25, and a Mega pixel count.

13. A method for single-shot compressed optical-streaking ultra-high-speed imaging, comprising spatial encoding a transient event; optical temporal shearing resulting spatially encoded frames of the event, thereby creating an optical streak image, spatio-temporal integration, and reconstruction.

14. The method of claim 13 , wherein said spatial encoding the transient event comprises spatially encoding the transient event by a binary pseudo-random pattern, yielding spatially amplitude encoded frames; said optical temporal shearing of the resulting spatially encoded frames of the event comprises temporally shearing the spatially encoded frames of the event by a galvanometer scanner; said spatio-temporal integrating comprising integrating resulting spatial-temporal sheared encoded frames into a 2D image; and said reconstruction comprises recovering a movie from the 2D image recorded by a CMOS camera.

15. The method of claim 13 , wherein said spatial encoding the transient event comprises spatially encoding the transient event by a binary pseudo-random pattern, yielding spatially encoded frames; said optical temporal shearing of the resulting spatially amplitude encoded frames of the event comprises temporally shearing the spatially encoded frames of the event by a galvanometer scanner; said spatio-temporal integrating comprising integrating resulting spatial-temporal sheared encoded frame into a 2D image; and said reconstruction comprises recovering a movie from the 2D image recorded by a CMOS camera; the method comprising synchronizing a linear rotation of the galvanometer scanner and exposure of the camera.

16. The method of claim 13 , comprising selecting a spatial encoding module having a fixed ±12° flipping angle and about 1 Mega pixel count; a galvanometer scanner having a rotation frequency per second in a range between 1 and 160, and an angle step response of about 200 μs; and a CMOS camera having a frame rate per second in a range between 1 and 160, and a Mega pixel count.

17. The method of claim 13 , comprising imaging the transient event into a spatial encoding module, the spatial encoding module spatially encoding the transient event is by a binary pseudo-random pattern; and relaying resulting spatially encoded frames by a 4f system onto a CMOS camera.

18. The method of claim 13 , wherein said spatial encoding the transient event comprises multiplying an amplitude binary mask for each frame of the event, yielding encoded datacubes (x, y, t); said optical temporal shearing comprises shifting different frames to different spatial positions as a function of their arrival time, yielding spatial-temporal shifting datacubes (x, y+t−1, t); said integration comprises integrating datacubes as a 2D image (x, y+t−1); and said reconstruction comprises retrieving a video from the 2D image.

19. The method of claim 13 , wherein said spatial encoding of a transient event comprises multiplying an amplitude binary mask for each frame of the event, yielding encoded datacubes (x, y, t); said optical temporal shearing comprises shifting different frames to different spatial positions as a function of their arrival time, yielding spatial-temporal shifting datacubes (x, y+t−1, t); said integration comprises integrating the datacubes as a 2D image (x, y+t−1); and said reconstruction comprises retrieving a video from a measurement E of the 2D image, with:
E=TS o CI ( x,y,t ),  (1)

where I(x, y, t) is the light intensity of the transient event, C represents spatial encoding, S o represents linearly temporal shearing with the subscript “o” standing for “optical”, and T represents spatiotemporal integration; and

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Assignees

• Inst Nat Rech Scient

Inventors

• Liang Jinyang
• Liu Xianglei
• Vetrone Fiorenzo

Classifications

• G01J2011/005

  Streak cameras · CPC title

• G01J11/00

  Measuring the characteristics of individual optical pulses or of optical pulse trains · CPC title

• H04N23/60

  Control of cameras or camera modules · CPC title

• G01N21/6408

  with measurement of decay time, time resolved fluorescence · CPC title

• G01N21/6458

  Fluorescence microscopy (fluorescence microscopes per se G02B21/0076 and G02B21/16) · CPC title