CN111239765A - Active illumination-associated imaging system and active illumination-associated imaging method - Google Patents
Active illumination-associated imaging system and active illumination-associated imaging method Download PDFInfo
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- CN111239765A CN111239765A CN202010196632.5A CN202010196632A CN111239765A CN 111239765 A CN111239765 A CN 111239765A CN 202010196632 A CN202010196632 A CN 202010196632A CN 111239765 A CN111239765 A CN 111239765A
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
- G02B27/1046—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators
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- 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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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Abstract
The application provides an active illumination associated imaging system and an active illumination associated imaging method. The laser beam emitted by the light source module can be split by the beam splitting module to form a first beam, and the first beam irradiates on a target object. The reflected light of the target object irradiates to the beam splitting module and is split by the beam splitting module to form a third light beam. The third light beam is received by the receiving module for imaging the target object. The laser beam emitted by the light source module and the object reflected light pass through the beam splitting module. At this time, the light source module (transmitting system) and the receiving module (receiving system) may form a coaxial transceiving structure, i.e., the transmitting optical path and the receiving optical path are coaxial. Furthermore, the field of view of the transmitting system and the field of view of the receiving system are completely overlapped through the beam splitting module. The field of view of the transmitting system and the field of view of the receiving system are completely overlapped, and no blind area exists. When the distance to the target object is closer, the influence of the distance is avoided due to the fact that no blind area exists, and therefore the image of the target object is formed more accurately.
Description
Technical Field
The present application relates to the field of optical imaging technologies, and in particular, to an active illumination-related imaging system and an active illumination-related imaging method.
Background
Ghost imaging, also known as single-pixel imaging or correlated imaging, restores the image of an object by means of a correlation algorithm or compressed sensing 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 active illumination associated imaging system, light emitted by an emission system is irradiated onto a target object, and a receiving system collects and receives a reflected signal passing through the target object. However, in the conventional active illumination correlation imaging system, the emitting system and the receiving system are usually disposed in parallel off-axis, i.e. the optical paths of the emitting system and the receiving system are not on the same optical axis. The echo signal of the object can be measured when the fields of view of the transmitting system and the receiving system begin to overlap. However, in the conventional active illumination-related imaging system, since the optical paths of the transmitting system and the receiving system are not on the same optical axis, a blind zone is easily generated at a position close to the target object, that is, a region where the echo signal cannot be measured. At the moment, a blind area exists through imaging of the traditional active illumination related imaging system, and the imaging quality of the target object is adversely affected.
Disclosure of Invention
Based on this, it is necessary to provide an active illumination correlation imaging system and an active illumination correlation imaging method for solving the problem of a blind area existing in the imaging of the conventional active illumination correlation imaging system.
The application provides an active illumination correlation imaging system which comprises a light source module, a beam splitting module and a receiving module. The light source module is used for emitting laser beams. The beam splitting module is used for splitting the laser beam to form a first beam. The first light beam irradiates to a target object and is reflected by the target object to form object reflection light. And the object reflected light is split by the beam splitting module to form a third light beam. The first light beam is reflected light of the laser beam after passing through the beam splitting module, and the third light beam is transmitted light of the object reflected light after passing through the beam splitting module. The receiving module is used for obtaining an image of the target object based on the third light beam.
In one embodiment, the laser beam is split by the beam splitting module to form a second beam. The active illumination correlation imaging system also includes a beam absorption module. The light beam absorption module is used for absorbing the second light beam. The second light beam is transmitted light of the laser light beam after passing through the beam splitting module.
In one embodiment, the beam splitting module comprises a polarizing beam splitter. The light source module is used for emitting S-polarized laser beams. The first light beam is the light of the S-polarized laser beam after passing through the polarization beam splitter. The third light beam is light which is obtained by the object reflected light passing through the polarization beam splitter.
In one embodiment, the present application provides an active illumination correlation imaging system comprising a light source module, a beam splitting module, and a receiving module. The light source module is used for emitting laser beams. The beam splitting module is used for splitting the laser beam to form a first beam. The first light beam is irradiated to a target object. And is reflected by the target object to form object reflected light. And the object reflected light is split by the beam splitting module to form a third light beam. The first light beam is transmitted light of the laser beam after passing through the beam splitting module. The third light beam is reflected light of the object reflected light after passing through the beam splitting module. The receiving module is used for obtaining an image of the target object based on the third light beam.
In one embodiment, the laser beam is split by the beam splitting module to form a second beam. The active illumination correlation imaging system also includes a beam absorption module. The light beam absorption module is used for absorbing the second light beam. The second light beam is reflected light of the laser light beam after passing through the beam splitting module.
In one embodiment, the beam splitting module comprises a polarizing beam splitter. The light source module is used for emitting P-polarized laser beams. The first light beam is the light of the P-polarized laser beam after passing through the polarization beam splitter. The third light beam is light which is obtained by the object reflected light passing through the polarization beam splitter.
In one embodiment, the receiving module includes a spatial light modulation module, a detector module, a signal processing control module, and a control module. And the spatial light modulation module is used for modulating the third light beam to form a modulated detection light signal. The detector module is used for detecting the detection optical signal and converting the detection optical signal into a detection electrical signal. The signal processing control module is used for acquiring the detection electric signal and controlling the control module to send out a modulation signal. The control module is used for controlling the spatial light modulation module according to the modulation signal. And the signal processing control module calculates according to the modulation signal and the detection electric signal to obtain the image of the target object.
In one embodiment, the active illumination correlation imaging system further comprises a lens module. The lens module is arranged on a light path of the first light beam and is used for shaping and collimating the first light beam and the object reflected light.
In one embodiment, the active illumination correlation imaging system further comprises a first lens module and a second lens module. The first lens module is used for collimating the laser beam emitted by the light source module, and the laser beam collimated by the first lens module forms the first beam through the beam splitting module. The second lens module is used for projecting the third light beam to the receiving module.
In one embodiment, the present application provides an active illumination correlation imaging method comprising:
emitting a laser beam by a light source module;
enabling the laser beam to pass through a beam splitting module to form a first beam;
irradiating the first light beam to a target object, forming object reflection light by the target object through reflection, and forming a third light beam by the beam splitting module;
collecting, modulating, converting and calculating the third light beam through a receiving module to obtain an image of the target object;
the first light beam is reflected light of the laser light beam after passing through the beam splitting module, and the third light beam is transmitted light of the object reflected light after passing through the beam splitting module; alternatively, the first and second electrodes may be,
the first light beam is transmitted light of the laser light beam after passing through the beam splitting module, and the third light beam is reflected light of the object reflected light after passing through the beam splitting module.
The application provides the active illumination related imaging system and the active illumination related imaging method. The laser beam emitted by the light source module can be split by the beam splitting module to form the first beam, and the first beam irradiates the target object. The reflected light of the target object (i.e., the object reflected light) is irradiated to the beam splitting module. And the third light beam is formed by splitting through the beam splitting module. The third light beam is collected, modulated, converted and calculated (correlation operation or compressed sensing algorithm, etc.) by the receiving module, and an image of the target object can be obtained.
The laser beam emitted by the light source module and the object reflected light both pass through the beam splitting module. And the object reflected light enters the receiving module after passing through the beam splitting module and is used for imaging the target object. At this time, the active illumination related imaging system may enable the light source module (transmitting system) and the receiving module (receiving system) to form a transceiving coaxial structure through the beam splitting module, that is, enable a transmitting optical path and a receiving optical path to be coaxial. Furthermore, the beam splitting module can make the view field of the light source module (transmitting system) and the view field of the receiving module (receiving system) completely coincide without blind areas.
At the moment, the field of view of the transmitting system and the field of view of the receiving system are completely overlapped, and no blind area exists. When the distance to the target object is relatively close, the influence of the distance cannot be caused due to the absence of the blind area. Thus, the reflected light of the target object (i.e., the object reflected light) is received by the receiving module, and an image of the target object is formed more accurately.
Drawings
FIG. 1 is a schematic diagram of an active illumination correlation imaging system in one embodiment provided herein;
FIG. 2 is a schematic diagram of an active illumination correlation imaging system in one embodiment provided herein;
FIG. 3 is a schematic diagram of an active illumination correlation imaging system in one embodiment provided herein;
FIG. 4 is a schematic diagram of an active illumination correlation imaging system in one embodiment provided herein;
FIG. 5 is a schematic diagram of an associated imaging system in one embodiment provided herein;
FIG. 6 is a schematic structural diagram of an associated imaging system in one embodiment provided in the present application.
Description of the reference numerals
The active illumination related imaging system 100, the target object 10, the lens module 20, the light source module 30, the beam absorption module 40, the beam splitting module 50, the polarization beam splitter 510, the receiving module 60, the spatial light modulation module 610, the detector module 620, the signal processing control module 630, the control module 640, the first lens module 70, and the second lens module 80.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by way of embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the present application provides an active illumination correlation imaging system 100. The active illumination correlation imaging system 100 includes a light source module 30, a beam splitting module 50, and a receiving module 60. The light source module 30 is used for emitting a laser beam. The beam splitting module 50 is configured to split the laser beam to form a first beam. The first light beam is irradiated to the target object 10 and reflected by the target object 10 to form object reflection light. The object reflected light is split by the beam splitting module 50 to form a third light beam. The first light beam is the reflected light of the laser beam after passing through the beam splitting module 50. The third light beam is the transmitted light of the object reflected light after passing through the beam splitting module 50. The receiving module 60 is configured to collect, modulate, convert, and calculate the third light beam, so as to obtain an image of the target object 10.
The laser beam emitted from the light source module 30 may be split by the beam splitting module 50. The reflected light (i.e., the first light beam) of the laser beam split by the beam splitting module 50 is irradiated onto the target object 10. The reflected light of the target object 10 (i.e., the object reflected light) is irradiated to the beam splitting module 50. And split by the splitting module 50. The transmitted light (i.e., the third light beam) split by the beam splitting module 50 is collected, modulated, converted, and calculated (correlation operation or compressed sensing algorithm, etc.) by the receiving module 60, so as to obtain an image of the target object 10.
The laser beam emitted by the light source module 30 and the object reflected light both pass through the beam splitting module 50, and the object reflected light enters the receiving module 60 after passing through the beam splitting module 50, so as to image the target object 10. At this time, the active illumination related imaging system 100 may enable the light source module 30 (transmitting system) and the receiving module 60 (receiving system) to form a coaxial transceiving structure through the beam splitting module 50, that is, enable the transmitting optical path and the receiving optical path to be coaxial. Furthermore, the beam splitting module 50 can make the field of view of the light source module 30 (emission system) and the field of view of the receiving module 60 (receiving system) completely coincide, and there is no blind area.
At this time, the field of view of the light source module 30 (transmission system) and the field of view of the receiving module 60 (receiving system) completely coincide, and no blind area exists. When the distance to the target object 10 is relatively close, the influence of the distance is not caused because of no blind area. Thus, the reflected light of the target object 10 (i.e., the object reflected light) is received by the receiving module 60, and an image of the target object 10 is more accurately formed.
In one embodiment, the laser beam is split by the beam splitting module 50 to form the first beam and the second beam. The object reflected light is split by the beam splitting module 50 to form the third light beam. The active illumination correlation imaging system 100 also includes a beam absorption module 40. The beam absorption module 40 is configured to absorb the second light beam. The second light beam is the transmitted light of the laser beam after passing through the beam splitting module 50.
In this embodiment, the beam splitting module 50 may be a beam splitting prism, a beam splitting plate, or a beam splitting device formed by any combination of the beam splitting prism and the beam splitting plate, and is configured to split the laser beam and the object reflected light. The first light beam is light irradiated to the target object 10, and the second light beam is transmitted light of the laser beam after passing through the beam splitting module 50, and is unnecessary light. The third light beam is the light received by the receiving module 60. Unwanted light is absorbed by the beam absorption module 40 to avoid the second beam from affecting the imaging process of the target object 10.
In one embodiment, the beam absorption module 40 is a beam terminator for absorbing unwanted light. Specifically, the light beam absorption module 40 may also be a ferrous metal material or a light absorption device with good absorption performance.
In one embodiment, the receiving module 60 includes a spatial light modulation module 610, a detector module 620, a signal processing control module 630, and a control module 640. The spatial light modulation module 610 is configured to modulate the third light beam to form a modulated probe light signal. The detector module 620 is configured to detect the detection optical signal and convert the detection optical signal into a detection electrical signal. The signal processing control module 630 is configured to obtain the detection electrical signal, and control the control module 640 to send out a modulation signal. The control module 640 is configured to control the spatial light modulation module 610 according to the modulation signal. The signal processing control module 630 performs calculation according to the modulation signal and the detection electric signal to obtain an image of the target object 10.
The spatial light modulation module 610 replaces a detector array in a conventional imaging scheme to modulate the third light beam to form a modulated detection light signal. Specifically, the spatial light modulation module 610 may be a Digital Micromirror Device (DMD), an Acousto-optic deflector (AOD), or a metamaterial (which may be an Optical manipulation metamaterial), and the like. The detection light signal modulated by the spatial light modulation module 610 is transmitted to the detector module 620. The detector module 620 detects the detection light signal, converts the detection light signal into a detection electrical signal, and transmits the detection electrical signal to the signal processing control module 630. Specifically, the detector module 620 may be a single-pixel detector or a bucket detector.
The signal processing control module 630 obtains the detection electrical signal and controls the control module 640 to send out a modulation signal. The control module 640 controls the spatial light modulation module 610 according to the modulation signal, so as to modulate the third light beam through the spatial light modulation module 610. The signal processing control module 630 performs calculation (such as correlation operation or compressed sensing algorithm) according to the modulation signal and the detection electric signal, so as to obtain an image of the target object 10. Specifically, the signal processing control module 630 and the control module 640 may be a micro control unit, a computer, or the like, and are configured to control the spatial light modulation module 610 and perform data processing operation on detection data.
In one embodiment, the active illumination correlation imaging system 100 further comprises a lens module 20. The lens module 20 is disposed on the optical path of the first light beam, and is configured to shape and collimate the first light beam and the object reflected light.
The lens module 20 may be a lens assembly, a single lens with a single aperture, a lens group, a plurality of cylindrical mirrors, or a plurality of spherical mirrors. Since the first light beam and the object reflected light are relatively divergent, the lens module 20 performs spatial shaping, thereby achieving an efficient collimating and shaping effect. Thus, the lens module 20 projects the laser beam (the first beam) after passing through the beam splitting module 50 onto the target object 10. Meanwhile, the object reflection light formed by the reflection of the target object 10 is projected to the beam splitting module 50 through the lens module 20. And forms the third light beam through the beam splitting module 50 to the spatial light modulation module 610.
Referring to FIG. 2, in one embodiment, the beam splitting module 50 includes a polarizing beam splitter 510. The light source module 30 is configured to emit an S-polarized laser beam. The first beam is the light of the S-polarized laser beam after passing through the polarization beam splitter 510. The third light beam is light reflected by the object and passing through the polarization beam splitter 510.
In this embodiment, the polarization beam splitter 510 may be a polarization beam splitter prism, a glantylor prism, or a polarization beam splitter device formed by combining with each other. The light source module 30 is configured to emit an S-polarized laser beam. After the S-polarized laser beam passes through the polarization beam splitter 510, only light in the S-polarized state, i.e., the first beam, exists. And, when the object reflected light passes through the third light beam formed by the polarization beam splitter 510, only p-polarized light exists. At this time, the polarization beam splitter 510 and the S-polarized laser beam can prevent the formation of unnecessary light (i.e., the second beam). Therefore, the second light beam does not need to be absorbed by the light beam absorption module 40, the overall structure of the active illumination correlation imaging system 100 is simplified, the integration of products is facilitated, and the cost is saved.
Referring to fig. 3, the present application provides an active illumination correlation imaging system 100. The active illumination correlation imaging system 100 includes a light source module 30, a beam splitting module 50, and a receiving module 60. The light source module 30 is used for emitting a laser beam. The beam splitting module 50 is configured to split the laser beam to form a first beam. The first light beam is irradiated to the target object 10 and reflected by the target object 10 to form object reflection light. The object reflected light is split by the beam splitting module 50 to form a third light beam. The first light beam is the transmitted light of the laser beam after passing through the beam splitting module 50. The third light beam is the reflected light of the object reflected light after passing through the beam splitting module 50. The receiving module 60 is configured to collect, modulate, convert, and calculate the third light beam, so as to obtain an image of the target object 10.
The laser beam emitted from the light source module 30 may be split by the beam splitting module 50. The transmitted light (i.e., the first light beam) split by the beam splitting module 50 is irradiated onto the target object 10. The reflected light of the target object 10 (i.e., the object reflected light) is irradiated to the beam splitting module 50. And split by the splitting module 50. The reflected light (i.e., the third light beam) obtained by splitting the object reflected light by the beam splitting module 50 is collected, modulated, converted, and calculated (correlation operation or compressed sensing algorithm, etc.) by the receiving module 60, so as to obtain an image of the target object 10.
The laser beam emitted from the light source module 30 and the object reflected light both pass through the beam splitting module 50. And the object reflected light enters the receiving module 60 after passing through the beam splitting module 50, and is used for imaging the target object 10. At this time, the active illumination related imaging system 100 may enable the light source module 30 (transmitting system) and the receiving module 60 (receiving system) to form a coaxial transceiving structure through the beam splitting module 50, that is, enable the transmitting optical path and the receiving optical path to be coaxial. Further, the field of view of the light source module 30 (emission system) and the field of view of the receiving module 60 (receiving system) can be completely overlapped by the beam splitting module 50. Even when the light source module 30 (transmission system) and the receiving module 60 (receiving system) are relatively close to the target object 10, no blind area is generated and the influence of the distance is not generated. Thus, the reflected light of the target object 10 (i.e., the object reflected light) is received by the receiving module 60, and an image of the target object 10 is more accurately formed.
In one embodiment, the laser beam is split by the beam splitting module 50 to form the first beam and the second beam. The object reflected light is split by the beam splitting module 50 to form the third light beam. The active illumination correlation imaging system 100 also includes a beam absorption module 40. The beam absorption module 40 is configured to absorb the second light beam. The second light beam is the reflected light of the laser beam after passing through the beam splitting module 50.
In this embodiment, the first light beam is light irradiated to the target object 10, and the second light beam is reflected light of the laser beam after passing through the beam splitting module 50, and is unnecessary light. The third light beam is the light received by the receiving module 60. Unwanted light is absorbed by the beam absorption module 40 to avoid the second beam from affecting the imaging process of the target object 10.
Referring to FIG. 4, in one embodiment, the beam splitting module 50 includes a polarizing beam splitter 510. The light source module 30 is used for emitting a P-polarized laser beam. The first light beam is light of the P-polarized laser beam passing through the polarization beam splitter 510, and the third light beam is light of the object reflected light passing through the polarization beam splitter 510.
In this embodiment, the light source module 30 is configured to emit a P-polarized laser beam. When the P-polarized laser beam passes through the polarization beam splitter 510, only the P-polarized light, i.e., the first beam, exists. When the object reflected light passes through the third light beam formed by the polarization beam splitter 510, only s-polarized light exists. At this time, the polarization beam splitter 510 and the P-polarized laser beam can prevent the formation of unnecessary light (i.e., the second beam). Therefore, the second light beam does not need to be absorbed by the light beam absorption module 40, the overall structure of the active illumination correlation imaging system 100 is simplified, the integration of products is facilitated, and the cost is saved.
Referring to fig. 5-6, in one embodiment, the active illumination correlation imaging system further includes a first lens module 70 and a second lens module 80. The first lens module 70 is configured to collimate the laser beam emitted by the light source module 30, and the laser beam collimated by the first lens module 70 forms the first beam through the beam splitting module 50. The second lens module 80 is used for projecting the third light beam to the receiving module 60.
In this embodiment, the first lens module 70 and the second lens module 80 may be a lens assembly, a single lens with a single aperture, a lens group, a plurality of cylindrical lens assemblies, or a plurality of spherical lens assemblies. The laser beam emitted from the light source module 30 is collimated to the beam splitting module 50 by the first lens module 70. The first light beam is formed after passing through the beam splitting module 50, and the first light beam is projected to the target object 10 through the lens module 20. Through the second lens module 80, the third light beam is projected to the spatial light modulation module projected to the receiving module 60, so that the third light beam is received and detected.
In one embodiment, the present application provides an active illumination correlation imaging method comprising:
the light source module 30 emits a laser beam;
the laser beam passes through the beam splitting module 50 to form a first beam;
the first light beam irradiates a target object 10 and is reflected by the target object 10 to form object reflection light, and the object reflection light forms a third light beam after passing through the beam splitting module 50;
the receiving module 60 collects, modulates, converts and calculates the third light beam to obtain an image of the target object 10;
the first light beam is reflected light of the laser beam after passing through the beam splitting module 50, and the third light beam is transmitted light of the object reflected light after passing through the beam splitting module 50;
or, the first light beam is the transmitted light of the laser beam passing through the beam splitting module 50, and the third light beam is the reflected light of the object reflected light passing through the beam splitting module 50.
The laser beam emitted from the light source module 30 can be split by the beam splitting module 50 to form the first beam to be irradiated onto the target object 10. The object reflected light irradiates the beam splitting module 50, and is split by the beam splitting module 50 to form the third light beam, which is collected, modulated, converted, and calculated (correlation operation or compressed sensing algorithm, etc.) by the receiving module 60, so as to obtain the image of the target object 10.
The laser beam emitted by the light source module 30 and the object reflected light both pass through the beam splitting module 50, and the object reflected light enters the receiving module 60 after passing through the beam splitting module 50. At this time, the emission light path and the receiving light path can be coaxial by the active illumination correlation imaging method. Further, the field of view of the light source module 30 (transmission system) and the field of view of the receiving module 60 (reception system) are completely overlapped, and there is no blind area.
At this time, the field of view of the light source module 30 (transmission system) and the field of view of the receiving module 60 (receiving system) completely coincide, and no blind area exists. When the distance to the target object 10 is relatively close, the influence of the distance is not caused because of no blind area. Thus, the object reflected light is received by the receiving module 60, and an image of the target object 10 is more accurately formed.
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 scope of the present application. 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 system, comprising:
a light source module (30) for emitting a laser beam;
the beam splitting module (50) is used for splitting the laser beam to form a first beam;
the first light beam irradiates a target object (10) and is reflected by the target object (10) to form object reflection light, and the object reflection light is split by the beam splitting module (50) to form a third light beam;
the first light beam is reflected light of the laser light beam after passing through the beam splitting module (50), and the third light beam is transmitted light of the object reflected light after passing through the beam splitting module (50);
a receiving module (60) for obtaining an image of the target object (10) based on the third light beam.
2. The active illumination correlation imaging system of claim 1, wherein the laser beam is further split by the beam splitting module (50) to form a second beam;
the active illumination correlation imaging system further comprises:
a beam absorption module (40) for absorbing the second light beam;
the second light beam is the transmitted light of the laser beam after passing through the beam splitting module (50).
3. The active illumination correlation imaging system of claim 1, wherein the beam splitting module (50) comprises a polarizing beam splitter (510), the light source module (30) being configured to emit an S-polarized laser beam;
the first light beam is light of the S-polarized laser beam after passing through the polarization beam splitter (510), and the third light beam is light of the object reflected light after passing through the polarization beam splitter (510).
4. An active illumination correlation imaging system, comprising:
a light source module (30) for emitting a laser beam;
the beam splitting module (50) is used for splitting the laser beam to form a first beam;
the first light beam irradiates a target object (10) and is reflected by the target object (10) to form object reflection light, and the object reflection light is split by the beam splitting module (50) to form a third light beam;
the first light beam is transmitted light of the laser light beam after passing through the beam splitting module (50), and the third light beam is reflected light of the object after passing through the beam splitting module (50);
a receiving module (60) for obtaining an image of the target object (10) based on the third light beam.
5. The active illumination correlation imaging system of claim 4, wherein the laser beam is further split by the beam splitting module (50) to form a second beam;
the active illumination correlation imaging system further comprises:
a beam absorption module (40) for absorbing the second light beam;
the second light beam is the reflected light of the laser beam after passing through the beam splitting module (50).
6. The active illumination correlation imaging system of claim 4, wherein the beam splitting module (50) comprises a polarizing beam splitter (510), the light source module (30) being configured to emit a P-polarized laser beam;
the first light beam is light of the P-polarized laser beam after passing through the polarization beam splitter (510), and the third light beam is light of the object reflected light after passing through the polarization beam splitter (510).
7. The active illumination correlation imaging system of claim 1 or claim 4, wherein the receiving module (60) comprises a spatial light modulation module (610), a detector module (620), a signal processing control module (630), and a control module (640);
the spatial light modulation module (610) is configured to modulate the third light beam to form a modulated probe light signal;
the detector module (620) is configured to detect the detection optical signal and convert the detection optical signal into a detection electrical signal;
the signal processing control module (630) is used for acquiring the detection electric signal and controlling the control module (640) to send out a modulation signal;
the control module (640) is used for controlling the spatial light modulation module (610) according to the modulation signal;
the signal processing control module (630) performs calculation according to the modulation signal and the detection electric signal to obtain an image of the target object (10).
8. The active illumination correlation imaging system of claim 1 or claim 4, further comprising:
and the lens module (20) is arranged on the light path of the first light beam and is used for shaping and collimating the first light beam and the object reflected light.
9. The active illumination correlation imaging system of claim 1 or claim 4, further comprising:
a first lens module (70) for collimating the laser beam emitted by the light source module (30), wherein the laser beam collimated by the first lens module (70) forms the first beam by the beam splitting module (50);
a second lens module (80) for projecting the third light beam to the receiving module (60).
10. An active illumination correlation imaging method, comprising:
emitting a laser beam by a light source module (30);
the laser beam is processed by a beam splitting module (50) to form a first beam;
irradiating the first light beam to a target object (10), reflecting object reflected light formed by the target object (10), and forming a third light beam after passing through the beam splitting module (50);
collecting, modulating, converting and calculating the third light beam through a receiving module (60) to obtain an image of the target object (10);
the first light beam is reflected light of the laser light beam after passing through the beam splitting module (50), and the third light beam is transmitted light of the object reflected light after passing through the beam splitting module (50); or
The first light beam is transmitted light of the laser beam after passing through the beam splitting module (50), and the third light beam is reflected light of the object reflected light after passing through the beam splitting module (50).
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