CN111538033A - Active illumination associated imaging emission system and active illumination associated imaging system - Google Patents
Active illumination associated imaging emission system and active illumination associated imaging system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
- G01S7/4812—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver transmitted and received beams following a coaxial path
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0905—Dividing and/or superposing multiple light beams
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
Abstract
The application relates to an active illumination associated imaging emission system and an active illumination associated imaging system. The active illumination associated imaging emission system can modulate the laser beam output by the light source module through the spatial light modulation module to form a modulated light field. The modulated light field forms a first real image through the first lens module and then forms an emergent light field through the second lens module. Therefore, the distance between the second lens module and the spatial light modulation module can be prolonged by the arrangement of the first lens module, so that when the second lens module is avoided being used independently, the second lens module shields the laser beam of the light source module incident on the spatial light modulation module from influencing the distribution of the modulated light field, namely, the influence on the associated imaging effect is avoided.
Description
Technical Field
The present application relates to the field of correlated imaging technologies, and in particular, to an active illumination correlated imaging emission system and an active illumination correlated imaging system.
Background
Ghost imaging is a novel imaging technology, and an image of an object is restored through a correlation algorithm or a compressed sensing method and the like. Compared with the traditional imaging mode, ghost imaging has the advantages of high sensitivity, low cost and the like, and can be applied to the fields of remote sensing, laser radar, video monitoring and the like.
In a conventional related imaging system, a single lens is often used as an emitting lens, which causes the light field emitted by the laser to be blocked by the single lens or a clamping member thereof, thereby affecting the imaging quality.
Disclosure of Invention
Based on this, it is necessary to provide an active illumination-related imaging emission system and an active illumination-related imaging system for solving the problem that the single lens is used as an emission lens, which results in the light field emitted by the laser being blocked by the single lens or a clamping member thereof.
The application provides an active illumination correlation imaging emission system, includes:
the light source module is used for emitting laser beams;
the spatial light modulation module is arranged on a light path of light emitted from the light source module and used for spatially modulating the laser beam to form a modulated light field;
the first lens module is arranged on a light path of light rays emitted from the spatial light modulation module and used for receiving the modulated light field, and the modulated light field forms a first real image through the first lens module; and
and the second lens module is arranged on a light path of light rays emitted from the first lens module and used for receiving the first real image, and the first real image forms an emergent light field through the second lens module and irradiates to a target to be measured.
In one embodiment, the spatial light modulation module includes a digital micromirror array disposed on a light path of the light emitted from the light source module, and is configured to spatially modulate the laser beam to form the modulated light field.
In one embodiment, the first lens module includes a first single lens, which is disposed on the optical path of the light emitted from the spatial light modulation module and is used for receiving the modulated light field, and the modulated light field forms the first real image through the first single lens; or
The first lens module comprises a first cemented lens, the first cemented lens is arranged on a light path of light rays emitted from the spatial light modulation module and is used for receiving the modulated light field, and the modulated light field forms the first real image through the first cemented lens; or
The first lens module includes a first lens group including a plurality of lenses, the plurality of lenses being coaxial, the modulated light field forming the first real image through the first lens group.
In one embodiment, the second lens module includes a second single lens, and the second single lens is disposed on a light path of light rays emitted from the first lens module and is configured to receive the first real image, and the first real image forms the emitted light field through the second single lens and irradiates the target to be measured; or
The second lens module comprises a second cemented lens, the second cemented lens is arranged on a light path of light rays emitted from the first lens module and is used for receiving the first real image, and the first real image forms the emitted light field through the second cemented lens and irradiates the target to be measured; or
The second lens module comprises a second lens group, the second lens group is arranged on a light path of emergent light rays from the first lens module and used for receiving the first real image, and the first real image forms an emergent light field through the second lens group and irradiates the target to be measured.
In one embodiment, the active illumination correlation imaging emission system further comprises a beam shaping module disposed between the first lens module and the second lens module for blocking diffraction images other than the first real image.
In one embodiment, the beam shaping module comprises an optical stop coaxial with the first lens module for blocking diffraction images other than the first real image.
Based on the same inventive concept, the present application further provides an active illumination correlation imaging emission system, comprising:
the light source module is used for emitting laser beams;
the spatial light modulation module is arranged on a light path of light emitted from the light source module and used for spatially modulating the laser beam to form a modulated light field;
the three third lens modules are sequentially arranged on a light path of light rays emitted from the spatial light modulation module and used for receiving the modulated light field, each time the modulated light field passes through one third lens module, a real image is formed, and the real image passes through the last third lens module to form an emergent light field and irradiates a target to be measured.
Based on the same inventive concept, the present application further provides an active illumination correlation imaging system, comprising:
the light source module is used for emitting laser beams;
the spatial light modulation module is arranged on a light path of light emitted from the light source module and used for spatially modulating the laser beam to form a modulated light field;
the first lens module is arranged on a light path of light rays emitted from the spatial light modulation module and used for receiving the modulated light field, and the modulated light field forms a first real image through the first lens module;
the second lens module is arranged on a light path of light rays emitted from the first lens module and used for receiving the first real image, and the first real image forms an emergent light field through the second lens module and irradiates to a target to be measured; and
and the receiving module is arranged on a light path along the transmission direction of the target light field and used for receiving the target light field and obtaining an image of the target to be detected according to the target light field.
In one embodiment, the receiving module includes:
the fourth lens module is arranged on an optical path along the transmission direction of the target light field and used for receiving the target light field;
the detector is arranged on a light path of light rays emitted from the fourth lens module and used for receiving the target light field collected by the fourth lens module and converting the target light field into an electric signal carrying information of the target to be detected; and
and the computing device is electrically connected with the detector and used for receiving the electric signal carrying the information of the target to be detected and obtaining the image of the target to be detected according to the electric signal carrying the information of the target to be detected.
In one embodiment, the detector is one of a single Pixel detector, a Charge-coupled Device (CCD), a Complementary Metal Oxide Semiconductor (CMOS), and a Multi-Pixel photon Counter (MPPC).
The active illumination associated imaging emission system provided by the above embodiment can modulate the laser beam output by the light source module through the spatial light modulation module to form a modulated light field. The modulated light field is incident on the first lens module, and a first real image is formed on one side of the emergent light of the first lens module. The first real image passes through the second lens module, and an emergent light field can be formed on one side of the second lens module, which is far away from the first real image, namely the first real image can be projected to the target to be measured through the second lens module. Therefore, the distance between the second lens module and the spatial light modulation module can be prolonged by the arrangement of the first lens module, so that the problem that the distribution of a modulated light field and an associated imaging effect are influenced due to the fact that the second lens module shields a laser beam of the light source module entering the spatial light modulation module when the second lens module is used alone is avoided.
Drawings
Fig. 1 is a schematic connection diagram of a first active illumination correlation imaging emission system according to an embodiment of the present disclosure;
fig. 2 is a schematic connection diagram of a second active illumination correlation imaging emission system according to an embodiment of the present disclosure;
fig. 3 is a schematic connection diagram of a third active illumination correlation imaging emission system provided in the embodiment of the present application;
fig. 4 is a schematic connection diagram of a fourth active illumination correlation imaging emission system provided in the embodiment of the present application;
fig. 5 is a schematic connection diagram of a fifth active illumination correlation imaging emission system according to an embodiment of the present disclosure;
fig. 6 is a schematic view of an optical path structure of an active illumination correlation imaging emission system according to an embodiment of the present disclosure;
fig. 7 is a schematic connection diagram of a sixth active illumination correlation imaging emission system according to an embodiment of the present application;
fig. 8 is a schematic connection diagram of a seventh active illumination correlation imaging system according to an embodiment of the present disclosure;
fig. 9 is a schematic connection diagram of a receiving device of an active illumination correlation imaging system according to an embodiment of the present disclosure.
Description of the reference numerals
100 active illumination associated imaging emission system
10 light source module
20 spatial light modulation module
210 digital micromirror array
30 first lens module
310 first single lens
320 first cemented lens
330 first lens group
40 second lens module
410 second einzel lens
420 second cemented lens
430 second lens group
50 light beam shaping module
510 diaphragm
60 receiving module
610 fourth lens module
620 detector
630 computing device
70 third lens module
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Ghost imaging, also known as two-photon imaging or correlation imaging, is an indirect imaging method without an array detector. That is, as long as the light field distribution irradiated on the target to be measured is obtained, the image of the object can be restored by methods such as a correlation algorithm or compressed sensing. The principle of the active illumination first modulation ghost imaging method is as follows: light emitted by the light source is firstly modulated into a known and controllable modulation light field through the spatial light modulator and then is projected on an object to be measured through the emission lens. The receiving lens is used for collecting a light field reflected after the modulated light field is incident on a target to be detected, detecting an optical signal through a single-pixel detector lacking spatial resolution capability and converting the optical signal into an electric signal. The computing system can calculate (correlation operation or compressed sensing algorithm, etc.) the collected electric signals and the modulation signals sent by the control system to obtain the image of the target object. Compared with the traditional imaging mode, ghost imaging has the advantages of high sensitivity, low cost and the like, and can be applied to the fields of remote sensing, investigation, exploration and the like.
Referring to fig. 1, the present application provides an active illumination correlation imaging emission system 100. The active illumination correlation imaging emission system 100 includes a light source module 10, a spatial light modulation module 20, a first lens module 30, and a second lens module 40. The light source module 10 is used to emit a laser beam. The spatial light modulation module 20 is disposed on a light path of light emitted from the light source module 10, and is configured to spatially modulate a laser beam to form a modulated light field. The first lens module 30 is disposed on the light path of the light emitted from the spatial light modulation module 20, and is configured to receive a modulated light field, where the modulated light field forms a first real image through the first lens module 30. The second lens module 40 is disposed on a light path of the light emitted from the first lens module 30, and is configured to receive a first real image, where the first real image forms an emitted light field through the second lens module 40 and irradiates the object to be measured.
It is understood that the present application does not limit the specific type of laser output from the light source module 10, as long as the laser beam emitted therefrom can satisfy the requirements of active illumination associated imaging. In one embodiment, the light source module 10 may include a laser. By adopting laser as an active illumination light source, the signal-to-noise ratio of the light signal incident to the spatial light modulation module 20 can be improved, so that the quality of an emergent light field projected to a target to be detected by the active illumination associated imaging emission system 100 is improved, and the effect of subsequent associated imaging is improved.
The spatial light modulation module 20 may modulate a certain parameter of the light field by the spatial light modulation unit under active control. In one embodiment, the spatial light modulation module 20 may modulate the amplitude of the light field, so as to write the predetermined information into the light wave for the purpose of light wave modulation. The spatial light modulation module 20 may be disposed on an optical path of light emitted from the light source module 10, and spatially modulates an input laser beam to form a modulated light field. It is to be understood that the spatial light modulation device in the spatial light modulation module 20 is not particularly limited in the present application as long as it can output a modulated light field required for associated imaging in combination with the light source module 10. Specifically, the spatial light modulation module 20 may be a digital micromirror device, an acousto-optic deflector, or a metamaterial (which may be a light-manipulating metamaterial), etc. In one embodiment, the Spatial Light modulation module 20 may include a reflective Spatial Light Modulator (SLM), the laser beam output by the Light source module 10 may be incident to the reflective Spatial Light Modulator, and form a modulated Light field after being reflected by the reflective Spatial Light Modulator, and the modulated Light field may be incident to the first lens module 30.
The first lens module 30 may receive the modulated light field output by the spatial light modulation module 20 and form a first real image on the side of the first lens module 10 from which the light exits. The light field forming the first real image continues to propagate along the original transmission direction thereof and is incident on the second lens module 40, and an emergent light field is formed on one side of the second lens module 40 away from the first real image and is projected to the target to be measured. Therefore, the distance between the second lens module 40 and the spatial light modulation module 20 can be extended by disposing the first lens module 30, and meanwhile, the first lens module 30 can be selected according to the disposition position and parameters between the second lens module 40 and the spatial light modulation module 20, that is, the first lens module 30 with a proper focal length can be selected so that the distance between the first lens module 30 and the spatial light modulation module 20 can be kept proper. Therefore, the arrangement of the first lens module 30 can avoid that the second lens module 40 blocks the laser beam incident on the spatial light modulation module 20 from the light source module 10 when the second lens module 40 is used alone, which affects the quality and integrity of the modulated light field.
The active illumination correlation imaging emission system 100 provided by the above embodiment may modulate the laser beam output by the light source module 10 through the spatial light modulation module 20 to form a modulated light field. The modulated light field is incident on the first lens module 10, and forms a first real image on the side of the first lens module 10 from which the light exits. The first real image passes through the second lens module 40, and an emergent light field can be formed on a side of the second lens module 40 away from the first real image, that is, the first real image can be projected to the object to be measured through the second lens module 40. Therefore, the arrangement of the first lens module 30 can extend the distance between the second lens module 40 and the spatial light modulation module 20, so as to avoid that when the second lens module 40 is used alone, the second lens module 40 blocks the laser beam incident on the spatial light modulation module 20 from the light source module 10, which may affect the distribution of the modulated light field and the associated imaging effect.
Referring to fig. 2, in one embodiment, the spatial light modulation module 20 includes a digital micromirror array 210, and the digital micromirror array 210 is disposed on the light path of the light emitted from the light source module 10 and is used for spatially modulating the laser beam to form a modulated light field. The digital micromirror array 210 is a light modulation device consisting of an array of micron-sized aluminum mirrors, each micromirror having only two states, on and off (i.e., +12 and-12 degrees rotated about its diagonal), that can amplitude modulate light specifically. In this embodiment, the laser beam emitted by the light source module 10 first passes through the digital micromirror array 210, and the digital micromirror array 210 spatially modulates the laser beam to form a modulated light field. The modulated light field is first incident on the first lens module 10 to form a first real image, and the first real image is projected to the target to be measured after passing through the second lens module 40. In one embodiment, the preset micromirrors on the dmd array 210 may be flipped by +12 ° for each measurement, so that the modulated light is rotated by 24 ° and reflected to the first lens module 30 for imaging. It will be appreciated that the digital micromirror array 210 has the advantages of full digitalization and high image quality, and can realize precise amplitude modulation of the second real image, thereby ensuring the imaging quality of the associated imaging.
In one embodiment, the digital micromirror array can be replaced with an absorptive modulator comprising a plurality of superconducting modules. In one embodiment, the spatial light modulation module 20 may further include one of any spatial light modulators, such as a low temperature LCOS spatial light modulator, a reflective spatial light modulator, a transmissive spatial light modulator, and the like, and may adaptively adjust the optical path structure according to the type of the spatial light modulator. It should be noted that the present application does not specifically limit the type of the spatial light modulator included in the spatial light modulation module 20, and the present application is within the protection scope of the present application as long as the spatial modulation of the laser beam to form the modulated light field can be achieved.
Referring to fig. 2-4, in one embodiment, the first lens module 30 includes a first single lens 310, and the first single lens 310 is disposed on an optical path of the light emitted from the spatial light modulation module 20 and is used for receiving a modulated light field, and the modulated light field forms a first real image through the first single lens 310. Alternatively, the first lens module 30 includes a first cemented lens 320, and the first cemented lens 320 is disposed on the optical path of the light emitted from the spatial light modulation module 20 and is used for receiving a modulated light field, and the modulated light field forms a first real image through the first cemented lens 320. Alternatively, the first lens module 30 includes a first lens group 330, the first lens group 330 includes a plurality of lenses, the plurality of lenses are coaxial, and the modulated light field forms a first real image through the first lens group 330.
In one embodiment, the second lens module 40 includes a second single lens 410, and the second single lens 410 is disposed on the light path of the light beam emitted from the first lens module 30 and is used for receiving a first real image, and the first real image forms an emitted light field through the second single lens 410 and irradiates the target to be measured. Alternatively, the second lens module 40 includes a second cemented lens 420, the second cemented lens 420 is disposed on the light path of the light emitted from the first lens module 30 and is used for receiving a first real image, and the first real image forms an emitted light field through the second cemented lens 420 and irradiates the target to be measured. Alternatively, the second lens module 40 includes a second lens group 430, and the second lens group 430 is disposed on the light path of the light emitted from the first lens module 30 and is used for receiving a first real image, and the first real image forms an emitted light field through the second lens group 430 and irradiates the target to be measured.
In one embodiment, the first single lens 310, the first cemented lens 320, the first lens group 330, and the second single lens 410, the second cemented lens 420, and the second lens group 430 may be made of metamaterials. It should be noted that there is no one-to-one correspondence relationship among the first single lens 310, the first cemented lens 320, the first lens group 330, the second single lens 410, the second cemented lens 420, and the second lens group 430, and any combination may be performed, which is not limited in the drawings of the present application.
When only a single lens is used as the emitting lens, there is an aberration in forming the light field, which reduces the quality of the light field. It can be understood that the lens group can reduce aberration when serving as an emission lens, but because the back focal length of the lens group is short, before the spatial light modulation module 20 modulates the laser beam, the laser beam output by the light source module 10 is easily blocked by the lens group or the clamping member of the lens group in the process of entering the spatial light modulation 30, which affects the quality of the modulated light field, thereby affecting the effect of associated imaging. In one embodiment, a combination of first lens module 30 and second lens module 40 may be employed in the emission light path instead of a single singlet lens, wherein first lens module 10 and/or second lens module 40 may include one or more coaxial singlet or lens groups. In one embodiment, the first single lens 310 may be disposed on the optical path between the second single lens 410 and the spatial light modulation module 20, that is, the first lens module 30 may include the first single lens 310, and the second lens module 40 may include the second single lens 410, so that the laser beam incident to the spatial light modulation module 20 may be prevented from being blocked by the second single lens 410, and the effect of correlated imaging may be improved.
In the present embodiment, the laser beam emitted from the light source module 10 may be first incident on the spatial light modulation module 20. The spatial light modulation module 20 performs spatial modulation on the laser beam to form a modulated light field. The modulated light field may continue to propagate to be incident on the first einzel lens 310 and form a first real image through the first einzel lens 310, which may then be projected through the second einzel lens 410 to the object to be measured. It can be understood that, by selecting the first single lens 310 with a proper focal length, the distance between the first single lens 310 and the spatial light modulation module 20 can be controlled, so that the laser beam incident on the spatial light modulation module 20 can be prevented from being blocked by the lens group in the first single lens 310 or the second single lens 410, and the effect of correlated imaging can be improved.
Referring to fig. 5-6, in one embodiment, the active illumination correlation imaging emission system 100 further includes a beam shaping module 50, and the beam shaping module 50 is disposed between the first lens module 30 and the second lens module 40 for blocking diffraction images other than the first real image. In one embodiment, the beam shaping module 50 includes an aperture 510, and the aperture 510 is coaxial with the first lens module 30 and is used for blocking other diffraction images except the first real image. It is understood that by providing the aperture 510, other diffraction images formed due to diffraction effects of the spatial light modulation module 20 can be blocked. The specific position where the stop 510 is disposed is not particularly limited in the present application, as long as it can block other diffraction images formed due to the diffraction effect of the spatial light modulation module 20. In one embodiment, the stop 510 may be disposed at a position where the light ray output from the first lens module 30 intersects the optical axis. The stop 510 is disposed at a position where the light output by the first lens module 30 intersects with the optical axis, so as to improve the filtering effect on other diffraction images formed by the diffraction effect of the spatial light modulation module 20.
Referring to fig. 7, based on the same inventive concept, the present application further provides an active illumination correlation imaging emission system 100. The active illumination correlation imaging emission system 100 includes a light source module 10, a spatial light modulation module 20, and at least three third lens modules 70. The light source module 10 is used to emit a laser beam. The spatial light modulation module 20 is disposed on a light path of light emitted from the light source module 10, and is configured to spatially modulate a laser beam to form a modulated light field. The at least three third lens modules 70 are sequentially disposed on the light path of the light emitted from the spatial light modulation module 20, and are configured to receive a modulated light field, where each modulated light field passes through one third lens module 70 to form a real image, and the real image passes through the last third lens module 70 to form an emitted light field and is irradiated to a target to be measured. It is understood that the number of the third lens modules 70 is not limited in the present application, and may be set according to the requirements of the active illumination associated imaging emission system 100.
Referring to fig. 8, based on the same inventive concept, the present application further provides an active illumination correlation imaging system. The active illumination correlation imaging system includes a light source module 10, a spatial light modulation module 20, first and second lens modules 30 and 40, and a receiving module 60. The light source module 10 is used to emit a laser beam. The spatial light modulation module 20 is disposed on a light path of light emitted from the light source module 10, and is configured to spatially modulate a laser beam to form a modulated light field. The first lens module 30 is disposed on the light path of the light emitted from the spatial light modulation module 20, and is configured to receive a modulated light field, where the modulated light field forms a first real image through the first lens module 30. The second lens module 40 is disposed on a light path of the light emitted from the first lens module 30, and is configured to receive a first real image, where the first real image forms an emitted light field through the second lens module 40 and irradiates the object to be measured. The emergent light field is reflected by the target to be detected to form a target light field carrying information of the target to be detected, and the receiving module 60 is arranged on the light path along the transmission direction of the target light field and is used for receiving the target light field and obtaining an image of the target to be detected according to the target light field.
It is understood that the light source module 10, the spatial light modulation module 20, the first lens module 30, and the second lens module 40 may be any one of the light source module 10, the spatial light modulation module 20, the first lens module 30, and the second lens module 40 in the foregoing embodiments, and details are not repeated herein. It is understood that the receiving module 60 may be configured to receive a target light field, where the target light field includes all information that may be used for performing correlation imaging calculation, and the receiving module 60 may convert an optical signal carrying target information into an electrical signal, and may perform correlation imaging calculation according to the received electrical signal and a modulation signal sent by the control system, so as to obtain an image of a target.
Referring also to FIG. 9, in one embodiment, the receiving module 60 includes a fourth lens module 610, a detector 620, and a computing device 630. The fourth lens module 610 is disposed on an optical path along a transmission direction of the target light field, and is configured to receive the target light field. The detector 620 is disposed on a light path of light emitted from the fourth lens module 610, and is configured to receive a target light field collected by the fourth lens module 610 and convert the target light field into an electrical signal carrying information of a target to be detected. The computing device 630 is electrically connected to the detector 620, and is configured to receive the electrical signal carrying the information of the target to be detected, and obtain an image of the target to be detected according to the electrical signal carrying the information of the target to be detected. In one embodiment, the detector 620 is one of a single Pixel detector, a Charge-coupled Device (CCD), a Complementary Metal Oxide Semiconductor (CMOS), a photomultiplier tube, and a Multi-Pixel photon Counter (MPPC). It should be noted that, the specific type of the detector 620 is not limited in this application, and it is within the protection scope of this application as long as it can receive the converged modulated optical field and convert the modulated optical field into an electrical signal.
In one embodiment, the fourth lens module 610 is disposed on the optical path along the transmission direction of the target light field for converging the modulated light field. The detector 620 may be disposed on an optical path of the emergent light of the fourth lens module 610, and configured to receive the converged target light field and convert the target light field into an electrical signal. It can be understood that the light reflected by the target to be measured has a certain divergence, and in order to ensure that the detector 620 can acquire all the optical signals carrying the target information, the fourth lens module 610 may be configured to converge and shape the target optical field. The specific position of the fourth lens module 610, the number of lenses included therein, and parameters may all be selected according to the target position, and the position setting and model of the detector 620, which is not specifically limited in the present application. In one embodiment, the fourth lens module 610 may include a converging lens disposed on an optical path along the transmission direction of the target light field for converging the target light field. In another embodiment, the fourth lens module 610 may further include a lens assembly, a single lens with a single aperture, a lens group, a plurality of cylindrical lenses or a plurality of spherical lenses, etc., as long as it can converge and shape the target light field.
The single-pixel detector can be applied to an indirect imaging mode without an array detector, and the spatial light modulation module 20 can replace a detector array in a traditional imaging scheme to acquire light field intensity associated information carrying target information. The detector 620 is connected to the computing device 630, and the computing device 630 can calculate (correlation operation or compressed sensing algorithm, etc.) the electrical signal carrying the target information and the modulation signal sent by the control system, so as to obtain the image of the target. Compared with the traditional geometric imaging mode, the single-pixel camera has the advantages of high sensitivity, low cost and the like when being used for associated imaging, and can be applied to the fields of remote sensing, investigation, exploration and the like.
In one embodiment, the computing device 630 may include a control module and a signal processing module, and the control module and the signal processing module are electrically connected. The control module may serve as a control system of the active illumination correlation imaging emission system 100, and may generate and send a modulation signal to the spatial light modulation module 20. The signal processing module may receive the electrical signal carrying the target information output by the detector 620, and perform correlation calculation by combining the modulated signal to obtain an image of the target. In one embodiment, the computing device 630 may be a micro-control unit or a computer, which may apply various associated imaging algorithms or compressive sensing algorithms, etc. to process the electrical signals output by the detector 620 to obtain an image of the target. It can be understood that the implementation process of using the associated imaging algorithm or the compressive sensing algorithm to perform the operation on the modulation signal and the electrical signal may refer to the method in the existing literature, and is not described herein again.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An active illumination correlation imaging emission system, comprising:
a light source module (10) for emitting a laser beam;
the spatial light modulation module (20) is arranged on a light path of light rays emitted from the light source module (10) and is used for carrying out spatial modulation on the laser beams to form a modulated light field;
the first lens module (30) is arranged on the light path of the light rays emitted from the spatial light modulation module (20) and used for receiving the modulated light field, and the modulated light field forms a first real image through the first lens module (30); and
and the second lens module (40) is arranged on a light path of light rays emitted from the first lens module (30) and used for receiving the first real image, and the first real image forms an emergent light field through the second lens module (40) and irradiates a target to be measured.
2. The active illumination correlation imaging emission system of claim 1, wherein the spatial light modulation module (20) comprises a digital micromirror array (210), the digital micromirror array (210) being disposed on an optical path of light emitted from the light source module (10) for spatially modulating the laser beam to form the modulated light field.
3. The active illumination correlation imaging emission system of claim 1, wherein the first lens module (30) comprises a first single lens (310), the first single lens (310) being disposed on an optical path of light rays exiting from the spatial light modulation module (20) for receiving the modulated light field, the modulated light field forming the first real image through the first single lens (310); or
The first lens module (30) comprises a first cemented lens (320), the first cemented lens (320) is arranged on the optical path of the light rays emitted from the spatial light modulation module (20) and is used for receiving the modulated light field, and the modulated light field forms the first real image through the first cemented lens (320); or
The first lens module (30) includes a first lens group (330), the first lens group (330) includes a plurality of lenses, a plurality of the lenses are coaxial, and the modulated light field forms the first real image through the first lens group (330).
4. The active illumination associated imaging emission system of claim 1, wherein the second lens module (40) comprises a second single lens (410), the second single lens (410) is disposed on the optical path of the light rays emitted from the first lens module (30) for receiving the first real image, and the first real image forms the emitted light field through the second single lens (410) and irradiates the target to be measured; or
The second lens module (40) comprises a second cemented lens (420), the second cemented lens (420) is arranged on a light path of light rays emitted from the first lens module (30) and is used for receiving the first real image, and the first real image forms the emitted light field through the second cemented lens (420) and irradiates the target to be measured; or
The second lens module (40) comprises a second lens group (430), the second lens group (430) is arranged on a light path of emergent light rays from the first lens module (30) and used for receiving the first real image, and the emergent light field is formed by the first real image through the second lens group (430) and the first real image irradiates the object to be measured.
5. The active illumination correlation imaging emission system of claim 1, further comprising a beam shaping module (50), the beam shaping module (50) being disposed between the first lens module (30) and the second lens module (40) for blocking diffraction images other than the first real image.
6. The active illumination correlation imaging emission system of claim 5, characterized in that the beam shaping module (50) comprises an optical stop (510), the optical stop (510) being coaxial with the first lens module (30) for blocking diffraction images other than the first real image.
7. An active illumination correlation imaging emission system, comprising:
a light source module (10) for emitting a laser beam;
the spatial light modulation module (20) is arranged on a light path of light rays emitted from the light source module (10) and is used for carrying out spatial modulation on the laser beams to form a modulated light field;
the three third lens modules (70) are sequentially arranged on a light path of light rays emitted from the spatial light modulation module (20) and used for receiving the modulated light field, each modulated light field passes through one third lens module (70) to form a real image, and the real image passes through the last third lens module (70) to form an emergent light field and irradiates to a target to be measured.
8. An active illumination correlation imaging system, comprising:
a light source module (10) for emitting a laser beam;
the spatial light modulation module (20) is arranged on a light path of light rays emitted from the light source module (10) and is used for carrying out spatial modulation on the laser beams to form a modulated light field;
the first lens module (30) is arranged on the light path of the light rays emitted from the spatial light modulation module (20) and used for receiving the modulated light field, and the modulated light field forms a first real image through the first lens module (30);
the second lens module (40) is arranged on a light path of light rays emitted from the first lens module (30) and used for receiving the first real image, and the first real image forms an emergent light field through the second lens module (40) and irradiates a target to be measured; and
the receiving module (60) is used for receiving the target light field and obtaining an image of the target to be detected according to the target light field.
9. The active illumination correlation imaging system of claim 8, wherein the receiving module (60) comprises:
a fourth lens module (610) arranged on an optical path along the transmission direction of the target light field for receiving the target light field;
the detector (620) is arranged on a light path of light rays emitted from the fourth lens module (610) and used for receiving the target light field collected by the fourth lens module (610) and converting the target light field into an electric signal carrying information of the target to be detected; and
and the computing device (630) is electrically connected with the detector (620) and is used for receiving the electric signal carrying the information of the target to be detected and obtaining the image of the target to be detected according to the electric signal carrying the information of the target to be detected.
10. The active illumination correlation imaging system of claim 9, wherein the detector (620) is one of a single pixel detector, a charge coupled element, a complementary metal oxide semiconductor, and a multi-pixel photon counter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948670A (en) * | 2020-08-19 | 2020-11-17 | 深圳元戎启行科技有限公司 | Light sensing device, imaging device and associated imaging method |
| CN111965664A (en) * | 2020-08-19 | 2020-11-20 | 深圳元戎启行科技有限公司 | Light emitting device, imaging system, and emission light modulation method |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948670A (en) * | 2020-08-19 | 2020-11-17 | 深圳元戎启行科技有限公司 | Light sensing device, imaging device and associated imaging method |
| CN111965664A (en) * | 2020-08-19 | 2020-11-20 | 深圳元戎启行科技有限公司 | Light emitting device, imaging system, and emission light modulation method |
| CN111948670B (en) * | 2020-08-19 | 2023-10-17 | 深圳元戎启行科技有限公司 | Light sensing device, imaging device and associated imaging method |
| CN111965664B (en) * | 2020-08-19 | 2024-01-23 | 深圳元戎启行科技有限公司 | Light emitting device, imaging system, and emission light modulation method |
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