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An imaging optical system

An imaging optics and imaging technology, applied in optics, optical components, instruments, etc., to expand the dynamic range of detection, meet the needs of measurement and observation of scenes with high dynamic radiant energy characteristics, and achieve good imaging quality.

Active Publication Date: 2019-10-15
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Description
  • Claims
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Problems solved by technology

[0004] The present invention aims to overcome the restriction of the dynamic range of the existing image sensor on the detection dynamic range of the photoelectric system, and provide an imaging optical system that meets the requirements for scene measurement and observation of high dynamic radiation energy characteristics

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Embodiment 1

[0046] In this embodiment, the size of the DMD micromirror array 130 is selected to be 1920×1080, and the size of a single micromirror is 10.8 μm. The resolution of the detector 160 is selected to be 1920×1080, and the pixel size is 10.8 μm. A catadioptric imaging optical system 100 with a long focal length and a small relative aperture is designed, and the operating wavelength is the visible light band. The system parameters are shown in Table 1. This imaging optical system 100 can be regarded as being made up of two parts, and the first part is the telescopic system that magnification is-1, by the first off-axis mirror 110, the first lens group 120, the DMD micromirror array 130, the second off-axis The second part is a secondary imaging system, which is composed of an imaging mirror group and a detector 160.

[0047] The design of the imaging optical system in this embodiment is as follows figure 1 and figure 2 As shown, following the right-handed coordinate rule, the Z-...

Embodiment 2

[0053] In this embodiment and embodiment 1, the same DMD micromirror array 230 and detector 260 are selected, and the parameters of the imaging optical system 200 are the same as those in embodiment 1, see Table 1. The secondary imaging system uses a coaxial catadioptric structure, which is different from Embodiment 1. This shows that the DMD micromirror array is replaceable as the imaging mirror group in the imaging optical system of the intermediate image plane to meet different application requirements.

[0054] The design of the imaging optical system 200 in this embodiment is as follows Figure 6 As shown, following the right-handed coordinate rule, the Z-axis is the system optical axis and coincides with the base normal of the DMD micromirror array 230 . The light incident direction is parallel to the Z axis and points in the positive direction.

[0055] The light emitted by the target object is converged by the first off-axis mirror 210 , enters the first lens group 22...

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Abstract

The present invention relates to the technical field of optical imaging, and discloses an imaging optical system, comprising a first off-axis reflector, a first lens group, a DMD micromirror array, a second off-axis reflector, an imaging mirror group and a detector. The light is converged by the first off-axis mirror, enters the first lens group, and is imaged on the DMD micromirror array, and the imaging beam is reflected by the DMD micromirror array and passes through the first lens group again , and then collimated by the second off-axis mirror, enter the imaging mirror group, and then form an image on the detector. The above-mentioned system uses DMD as the intermediate image plane and partially symmetrical optical structure design, which cleverly realizes the one-to-one correspondence between the DMD micromirror array and the detector pixel in space, so as to achieve the processing of the incoming light of the imaging system. Using the corresponding imaging relationship between the DMD device and the detector pixel, the gray level of the detector target surface can be adjusted, thereby expanding the dynamic range of the photoelectric imaging system.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to an imaging optical system. Background technique [0002] DMD is a popular spatial light modulator in recent years, mainly used in optical systems such as projectors and target generators. The DMD modulates the light intensity by controlling the flipping of millions of micromirrors on it, and each micromirror can be individually controlled. The state of the micromirror can be controlled by changing the data in the data unit corresponding to the micromirror. [0003] As a main optoelectronic imaging device, the image sensor has a detectable dynamic range of 48-60dB, which is the main factor restricting the detection range of the optoelectronic imaging system. High dynamic range imaging technology has an urgent demand in deep space exploration, medical imaging, military observation and other fields. Usually, the software processing method of multiple exposures or the hard...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B17/08
Inventor 何锋赟赵楠王延杰
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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