CN111751841A - Active illumination first modulation ghost imaging system - Google Patents

Active illumination first modulation ghost imaging system Download PDF

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Publication number
CN111751841A
CN111751841A CN202010746733.5A CN202010746733A CN111751841A CN 111751841 A CN111751841 A CN 111751841A CN 202010746733 A CN202010746733 A CN 202010746733A CN 111751841 A CN111751841 A CN 111751841A
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lens
modulation
echo energy
receiving
energy signal
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不公告发明人
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DeepRoute AI Ltd
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DeepRoute AI Ltd
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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
    • 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
    • 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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  • General Physics & Mathematics (AREA)
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  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The invention relates to an active illumination first modulation ghost imaging system, which comprises a light source module, a spatial light modulation module, an emission lens, a receiving lens, a detection module and a calculation module, wherein the light source module is used for emitting light; the light source module emits a laser beam; the spatial light modulation module performs spatial intensity modulation on the laser beam to form a modulated beam; the emission lens projects the modulated light beam to an object to be measured; the receiving lens receives a reflected light beam reflected by an object to be detected; the detection module is arranged on a focal plane of the receiving lens or between the receiving lens and the focal plane and is used for detecting the intensity of the reflected light beam to obtain an echo energy signal; the detection module is further used for reducing the difference between a detected first echo energy signal and a detected second echo energy signal, wherein the first echo energy signal is an echo energy signal of an object to be detected within a preset distance of the receiving lens, and the second echo energy signal is an echo energy signal of the object to be detected outside the preset distance of the receiving lens; the calculation module obtains an image of the object to be measured based on the echo energy signal.

Description

Active illumination first modulation ghost imaging system
Technical Field
The invention relates to the technical field of optical imaging, in particular to an active illumination first modulation ghost 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 characteristics of strong anti-interference, high-sensitivity detection, wide-view imaging and the like, and has great application potential in the fields of astronomical observation, remote sensing imaging, military investigation, medical imaging and the like.
In the existing ghost imaging mode, the echo energy of a near object detected by a detector is too different from the echo energy of a far object, and when the echo energy of the far object is detected, the detected echo energy of the near object may be saturated, and even the detector is damaged.
Disclosure of Invention
Therefore, it is necessary to provide an active illumination first modulation ghost imaging system to solve the problem of the existing ghost imaging method that the echo energy of the near object detected by the detector is too different from the echo energy of the far object.
An active illumination first modulation ghost 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 carrying out spatial intensity modulation on the laser beam to form a modulated beam;
the emission lens is arranged on a light path of light emitted from the spatial light modulation module, is used for receiving the modulated light beam and is also used for projecting the modulated light beam to an object to be measured;
the receiving lens is used for receiving the reflected light beam reflected by the object to be detected;
the detection module comprises a photosensitive unit with a preset area, is arranged on a focal plane of the receiving lens or between the receiving lens and the focal plane, and is used for detecting the intensity of the reflected light beam to obtain an echo energy signal;
the detection module is further configured to reduce a difference between a detected first echo energy signal and a detected second echo energy signal, where the first echo energy signal is an echo energy signal of an object to be detected located within a preset distance from the receiving lens, and the second echo energy signal is an echo energy signal of the object to be detected located outside the preset distance from the receiving lens;
and the computing module is electrically connected with the detection module and is used for receiving the echo energy signal and obtaining the image of the object to be detected based on the echo energy signal.
The active illumination first modulation ghost imaging system is characterized in that the detection module with the photosensitive unit with the preset area is arranged on the focal plane of the receiving lens or between the receiving lens and the focal plane, the detection module can detect most of echo energy of an object to be detected which is located outside the preset distance of the receiving lens, namely a second echo energy signal, the detection module can only detect a small part of echo energy of the object to be detected which is located within the preset distance of the receiving lens, namely a first echo energy signal, so that the difference between the detected first echo energy signal and the detected second echo energy signal can be reduced, when the detection module can detect the echo energy of a far object, namely the second echo energy signal, the detection module detects that the echo energy of a near object is not saturated, and the detection module can be prevented from being damaged.
In one embodiment, the predetermined area is
Figure BDA0002608639900000021
Where ω is the angle of view of the receiving lens, and f is the equivalent focal length of the receiving lens.
In one embodiment, the light source module includes:
a laser for emitting a laser beam; and
and the lens unit is arranged on the light path of the laser beam and is used for shaping and collimating the laser beam.
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 configured to perform spatial intensity modulation on the laser beam to form the modulated beam.
In one embodiment, the spatial light modulation module includes an absorption modulator disposed on an optical path of the light emitted from the light source module, and configured to spatially modulate the intensity of the laser beam to form the modulated beam, where the absorption modulator includes a superconducting material module.
In one embodiment, the emission lens comprises a first single lens, and the first single lens is used for receiving the modulated light beam and projecting the modulated light beam to an object to be measured; or
The transmitting lens comprises a first cemented lens, the first cemented lens is used for receiving the modulated light beam and projecting the modulated light beam to an object to be measured; or
The emission lens comprises a first lens group which comprises a plurality of lenses and is used for receiving the modulated light beam and projecting the modulated light beam to an object to be measured.
In one embodiment, the receiving lens comprises a second single lens, and the second single lens is used for receiving a reflected light beam reflected by the object to be measured; or
The receiving lens comprises a second cemented lens, and the second cemented lens is used for receiving a reflected light beam reflected by the object to be detected; or
The receiving lens comprises a second lens group, the second lens group comprises a plurality of lenses, and the second lens group is used for receiving a reflected light beam reflected by the object to be detected.
In one embodiment, the calculation module comprises a signal processing unit and a control unit;
the signal processing unit is electrically connected with the detection module and is used for receiving the echo energy signal and controlling the control unit to send out a modulation signal;
the control unit is electrically connected with the spatial light modulation module and is used for controlling the spatial light modulation module according to the modulation signal;
the signal processing unit is further used for calculating according to the modulation signal and the echo energy signal to obtain an image of the object to be detected.
In one embodiment, the detection module is one of an avalanche photodiode, a charge coupled device, a complementary metal oxide semiconductor, and a multi-pixel photon counter.
In one embodiment, the detection module includes a filter, and the filter is configured to perform filtering processing on the echo energy signal and transmit the filtered echo energy signal to the calculation module.
Drawings
FIG. 1 is a schematic diagram of an active illumination first modulation ghost imaging system in one embodiment provided herein;
FIG. 2 is a schematic diagram of an active illumination first modulation ghost imaging system in one embodiment provided herein;
FIG. 3 is a schematic diagram of an active illumination first modulation ghost imaging system in one embodiment provided herein;
FIG. 4 is a schematic diagram of an active illumination first modulation ghost imaging system in an embodiment provided herein;
FIG. 5 is a schematic diagram illustrating positions of a first object to be tested, a second object to be tested, a receiving lens and a detecting module according to an embodiment of the disclosure;
FIG. 6 is a block diagram illustrating an embodiment of an active illumination first modulation ghost imaging system.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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.
Referring to fig. 1, an active illumination first modulation ghost imaging system according to an embodiment of the present disclosure includes a light source module 10, a spatial light modulation module 20, a transmitting lens 30, a receiving lens 40, a detecting module 50, and a calculating 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 configured to perform spatial intensity modulation on a laser beam to form a modulated beam. The emission lens 30 is disposed on a light path of the light emitted from the spatial light modulation module 20, and is configured to receive the modulated light beam and project the modulated light beam to the object 100 to be measured. The receiving lens 40 is used for receiving the reflected light beam reflected by the object 100 to be measured. The detection module 50 includes a photosensitive unit with a preset area, and the detection module 50 is disposed on the focal plane of the receiving lens 40 or between the receiving lens 40 and the focal plane, and is configured to detect the intensity of the reflected light beam to obtain an echo energy signal. The detection module 50 is further configured to reduce a difference between a detected first echo energy signal and a detected second echo energy signal, where the first echo energy signal is an echo energy signal of an object to be detected located within a preset distance from the receiving lens 40, and the second echo energy signal is an echo energy signal of an object to be detected located outside the preset distance from the receiving lens 40. The calculation module 60 is electrically connected to the detection module 50, and the calculation module 60 is configured to receive the echo energy signal and obtain an image of the object 100 to be measured based on the echo energy signal.
The object to be measured 100 includes a first object to be measured 101 and a second object to be measured 102. All objects 100 to be measured within a predetermined distance from the receiving lens 40 are first objects 101 to be measured, and all objects 100 to be measured outside the predetermined distance from the receiving lens 40 are second objects 102 to be measured.
Within the field of view of the receiving lens 40, as the object 100 gradually moves away from the receiving lens 40, the image plane of the object 100 gradually approaches from far to the focal plane, and the size of the image gradually decreases, and when the image of the object 100 is located at the focal plane of the receiving lens 40, the size of the image of the object 100 is as follows
Figure BDA0002608639900000061
Therefore, the photosensitive sheet with a preset areaThe detection module 50 is disposed on the focal plane of the receiving lens 40 or between the receiving lens 40 and the focal plane, the detection module 50 can detect most of the echo energy reflected by the second object to be detected 102, i.e. the second echo energy signal, and the detection module 50 can only detect a small portion of the echo energy reflected by the first object to be detected 101, i.e. the first echo energy signal, so that the difference between the first echo energy signal and the second echo energy signal detected by the detection module 50 can be reduced, so that when the detection module 50 can detect the echo energy of a distant object, i.e. the second echo energy signal, the detection module 50 detects that the echo energy of a near object is not saturated, and the detection module 50 can be prevented from being damaged.
Referring to fig. 2, in one embodiment, the light source module 10 includes a laser 11 and a lens unit 12. The laser 11 is used to emit a laser beam. The lens unit 12 is disposed on the optical path of the laser beam, and is configured to shape and collimate the laser beam. The lens unit 12 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 laser beam emitted by the laser 11 may be relatively divergent, the lens unit 12 performs spatial shaping, and thus, an efficient collimating and shaping effect can be achieved. Thus, the lens unit 12 projects the laser beam after the shaping and collimating processes onto the object 100 to be measured.
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 can modulate the amplitude of the light beam, 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 performs spatial intensity modulation on an input laser beam to form a modulated beam. 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 beam required for ghost imaging in combination with the light source module 10. Specifically, the spatial light modulation module 20 may be a digital micro-mirror array 21, an acousto-optic deflector, or a metamaterial (which may be a light-manipulating metamaterial), and the spatial light modulation module 20 may further include a reflective light Modulator (SLM) or an absorption Modulator 22.
Referring to fig. 3, in one embodiment, the spatial light modulation module 20 includes a digital micromirror array 21, and the digital micromirror array 21 is disposed on the light path of the light emitted from the light source module 10 and is used for performing spatial intensity modulation on the laser beam to form a modulated light beam. The digital micromirror array 21 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 modulate the amplitude of light specifically. In the present embodiment, the laser beam emitted from the light source module 10 is amplitude-modulated by the digital micromirror array 21 to form a modulated beam. In one embodiment, a preset micromirror on the digital micromirror array 21 can be flipped +12 ° for each measurement, so that the modulated light is rotated 24 ° and then reflected to the emission lens 30. It can be appreciated that the digital micromirror array 21 has the advantages of full digitalization and high image quality, and can realize precise amplitude modulation of the laser beam, thereby ensuring the imaging quality of ghost imaging.
Referring to fig. 4, in one embodiment, the spatial light modulation module 20 includes an absorption modulator 22, and the absorption modulator 22 is disposed on an optical path of light emitted from the light source module 10 and is used for performing spatial intensity modulation on the laser beam to form a modulated beam, where the absorption modulator 22 includes a superconducting material module. 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 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 it is within the scope of the present application as long as the spatial intensity modulation of the laser beam emitted by the light source module 10 to form a modulated beam can be achieved.
In one embodiment, the emission lens 30 includes a first single lens for receiving the modulated light beam and projecting the modulated light beam to the object 100 to be measured. Alternatively, the emission lens 30 includes a first cemented lens for receiving the modulated light beam and projecting the modulated light beam to the object 100 to be measured. Alternatively, the emission lens 30 includes a first lens group including a plurality of lenses, and the first lens group is configured to receive the modulated light beam and project the modulated light beam to the object 100 to be measured.
In one embodiment, the receiving lens 40 includes a second single lens for receiving the reflected light beam reflected by the object 100 to be measured. Alternatively, the receiving lens 40 includes a second cemented lens for receiving the reflected light beam reflected by the object 100 to be measured. Alternatively, the receiving lens 40 includes a second lens group including a plurality of lenses, and the second lens group is used for receiving the reflected light beam reflected by the object 100 to be measured.
In one embodiment, the first single lens, the first cemented lens and/or the first lens group are made of a metamaterial, and the second single lens, the second cemented lens and/or the second lens group are made of a metamaterial. Any combination of the first single lens, the first cemented lens and the first lens group in the transmitting lens 30 and the second single lens, the second cemented lens and the second lens group in the receiving lens 40 can be performed, which is not limited in the drawings of the present application.
In one embodiment, the predetermined area is
Figure BDA0002608639900000081
Where ω is the angle of view of the receiving lens 40, f is the equivalent focal length of the receiving lens 40, and the size of the image of the object 100 at the focal plane of the receiving lens 40 is
Figure BDA0002608639900000082
Thus, the area of the light sensing unit of the detection module 50 is
Figure BDA0002608639900000083
And is arranged on the receiving lens40, the detection module 50 can detect all the echo energy of the object 100 to be detected imaged at the focal plane, the difference between the first echo energy signal and the second echo energy signal detected by the detection module 50 can be reduced, and the area of the photosensitive unit of the detection module 50 is set to be
Figure BDA0002608639900000084
The photosensitive unit of the detection module 50 can have a high utilization rate, and waste is not caused.
Referring to fig. 5, in fig. 5, the first object 101 to be measured is located within a predetermined distance of the receiving lens 40, i.e. a near object relative to the receiving lens 40, and the second object 102 to be measured is located outside the predetermined distance of the receiving lens 40, i.e. a far object relative to the receiving lens 40, the near object forms a first real image 201 through the receiving lens 40, and the far object forms a second real image 202 through the receiving lens 40. Within the field of view of the receiving lens 40, as the object 100 gradually moves away from the receiving lens 40, the image plane of the object 100 gradually gets closer from far to the focal plane, and the size of the image gradually decreases, as shown in the first real image 201 and the second real image 202. The second real image 202 is located at the focal plane of the receiving lens 40 and the size of the second real image 202 is
Figure BDA0002608639900000091
When the area of the photosensitive unit is larger than or equal to
Figure BDA0002608639900000092
The detection module 50 is disposed at a focal plane of the receiving lens 40, and the detection module 50 can detect all the echo energy reflected by the second object to be detected 102, and can detect only a small portion of the echo energy reflected by the first object to be detected 101, so as to reduce a difference between the first echo energy signal and the second echo energy signal detected by the detection module 50. When the area of the photosensitive unit is larger than or equal to
Figure BDA0002608639900000093
The detection module 50 is arranged between the receiving lens 40 and the focal plane of the receiving lens 40 for detectingThe module 50 can detect most of the echo energy reflected by the second object to be measured 102, and only a small portion of the echo energy reflected by the first object to be measured 101, so that the difference between the first echo energy signal and the second echo energy signal detected by the detection module 50 can be reduced.
In one embodiment, the detection module 50 includes a filter for filtering the echo energy signal and transmitting the filtered echo energy signal to the calculation module 60. It can be understood that the echo energy signal output by the detection module 50 includes a common-mode dc component and a noise signal, and therefore, the echo energy signal needs to be filtered by a filter to remove the common-mode dc component and the high-frequency signal in the echo energy signal, so as to improve the signal-to-noise ratio of the echo energy signal.
In one embodiment, the filter is a passive filter. It can be understood that the passive filter, also called as LC filter, is a filter circuit formed by using the combination design of inductor, capacitor and resistor, can filter out a certain or multiple harmonics, and has the advantages of simple structure, low cost, high operation reliability, low operation cost, etc., so the passive filter adopted in the embodiment is beneficial to simplifying the structural design of the active illumination first modulation ghost imaging system and reducing the production cost. It is to be understood that the filter may also be an active filter, and the present embodiment is not limited to the type of the filter.
In one embodiment, the detection module 50 may be one of a single pixel detector, an avalanche photodiode, a charge coupled device, a complementary metal oxide semiconductor, and a multi-pixel photon counter. The single pixel detector may be adapted to indirect imaging without an array detector, and in combination with the spatial light modulation module 20, may replace the detector array in conventional imaging schemes. In this embodiment, the avalanche photodiode may further amplify the echo energy signal to improve the sensitivity of detection. The charge coupled device, the avalanche photodiode and the complementary metal oxide semiconductor sensor have a function of converting an optical signal into an electrical signal, so that the charge coupled device, the avalanche photodiode and the complementary metal oxide semiconductor sensor can be used as a detector to convert a reflected light beam into an echo energy signal. In addition, other devices having a function of converting an optical signal into an electrical signal may also be used as the detection module 50, and the implementation manner of the detection module 50 is not specifically limited in the present invention.
Referring to fig. 6, in one embodiment, the calculation module 60 includes a signal processing unit 61 and a control unit 62. The signal processing unit 61 is electrically connected to the detection module 50, and is configured to receive the echo energy signal and control the control unit 62 to send out a modulation signal. The control unit 62 is electrically connected to the spatial light modulation module 20, and is configured to control the spatial light modulation module 20 according to the modulation signal. The signal processing unit 61 is further configured to perform calculation (correlation operation or compressed sensing algorithm, etc.) according to the modulation signal and the echo energy signal, so as to obtain an image of the object 100 to be measured. Compared with the traditional geometric imaging mode, the 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. The calculation module 60 may be a micro control unit or a computer or the like.
In the active illumination first modulation ghost imaging system provided in the above embodiment, the detection module 50 having the light sensing unit with the preset area is disposed on the focal plane of the receiving lens 40 or between the receiving lens 40 and the focal plane, the detection module 50 can detect most of the echo energy of the object 100 to be measured located outside the preset distance of the receiving lens 40, i.e., the second echo energy signal, the detection module 50 can detect only a small portion of the echo energy of the object 100 to be measured within a predetermined distance of the receiving lens 40, i.e., the first echo energy signal, and thus the difference between the detected first echo energy signal and the second echo energy signal, can be reduced, such that when the detection module 50 is able to detect the echo energy of a distant object, that is, when the second echo energy signal can be detected, the detection module 50 detects that the echo energy of the near object is not saturated, so that the detection module 50 can be prevented from being damaged.
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 invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An active illumination first modulation ghost 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 carrying out spatial intensity modulation on the laser beam to form a modulated beam;
the emission lens is arranged on a light path of light emitted from the spatial light modulation module, is used for receiving the modulated light beam and is also used for projecting the modulated light beam to an object to be measured;
the receiving lens is used for receiving the reflected light beam reflected by the object to be detected;
the detection module comprises a photosensitive unit with a preset area, is arranged on a focal plane of the receiving lens or between the receiving lens and the focal plane, and is used for detecting the intensity of the reflected light beam to obtain an echo energy signal;
the detection module is further configured to reduce a difference between a detected first echo energy signal and a detected second echo energy signal, where the first echo energy signal is an echo energy signal of an object to be detected located within a preset distance from the receiving lens, and the second echo energy signal is an echo energy signal of the object to be detected located outside the preset distance from the receiving lens;
and the computing module is electrically connected with the detection module and is used for receiving the echo energy signal and obtaining the image of the object to be detected based on the echo energy signal.
2. The active illumination first modulation ghost imaging system of claim 1, wherein the predetermined area is
Figure FDA0002608639890000011
Where ω is the angle of view of the receiving lens, and f is the equivalent focal length of the receiving lens.
3. The active illumination first modulation ghost imaging system of claim 1, wherein the light source module comprises:
a laser for emitting a laser beam; and
and the lens unit is arranged on the light path of the laser beam and is used for shaping and collimating the laser beam.
4. The active illumination first modulation ghost imaging system of claim 1, wherein the spatial light modulation module comprises a digital micromirror array disposed on a light path of light emitted from the light source module for spatially intensity modulating the laser beam to form the modulated beam.
5. The active illumination first modulation ghost imaging system of claim 1, wherein the spatial light modulation module comprises an absorption modulator disposed in an optical path of light rays emitted from the light source module for spatially intensity modulating the laser beam to form the modulated beam, wherein the absorption modulator comprises a superconducting material module.
6. The active illumination first modulation ghost imaging system of claim 1, wherein the emission lens comprises a first single lens for receiving the modulated light beam and further for projecting the modulated light beam to an object to be measured; or
The transmitting lens comprises a first cemented lens, the first cemented lens is used for receiving the modulated light beam and projecting the modulated light beam to an object to be measured; or
The emission lens comprises a first lens group which comprises a plurality of lenses and is used for receiving the modulated light beam and projecting the modulated light beam to an object to be measured.
7. The active illumination first modulation ghost imaging system of claim 1, wherein the receiving lens comprises a second single lens for receiving a reflected beam reflected by the object to be measured; or
The receiving lens comprises a second cemented lens, and the second cemented lens is used for receiving a reflected light beam reflected by the object to be detected; or
The receiving lens comprises a second lens group, the second lens group comprises a plurality of lenses, and the second lens group is used for receiving a reflected light beam reflected by the object to be detected.
8. The active illumination first modulation ghost imaging system of claim 1, wherein the computing module comprises a signal processing unit and a control unit;
the signal processing unit is electrically connected with the detection module and is used for receiving the echo energy signal and controlling the control unit to send out a modulation signal;
the control unit is electrically connected with the spatial light modulation module and is used for controlling the spatial light modulation module according to the modulation signal;
the signal processing unit is further used for calculating according to the modulation signal and the echo energy signal to obtain an image of the object to be detected.
9. The active illumination first modulation ghost imaging system of claim 1, wherein said detection module is one of a single pixel detector, an avalanche photodiode, a charge coupled device, a complementary metal oxide semiconductor, and a multi-pixel photon counter.
10. The active illumination first modulation ghost imaging system of claim 1, wherein the detection module comprises a filter, and the filter is configured to filter the echo energy signal and transmit the filtered echo energy signal to the calculation module.
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