Large-area scanning holographic camera system adopting separated condensation unit

Abstract

The invention relates to a large-area scanning holographic camera system adopting a separated condensation unit. According to the present invention, there is provided a large-area scanning holographic camera system comprising: a scanning beam generation unit that modulates a phase of a first beam split from a light source so as to convert the first beam into a first curvature beam by a first beam curvature generation unit, the second light beam is converted into a second curvature light beam through a second light beam curvature generation unit, and then the first curvature light beam and the second curvature light beam interfere with each other to form a scanning light beam; the scanning unit is used for receiving the scanning light beam to project the scanning light beam onto the object and controlling the scanning position of the scanning light beam relative to the object in the horizontal and vertical directions to transfer the scanning light beam to the object; the projection unit comprises a scanning lens and an imaging lens system, and is used for projecting the scanning light beam received from the scanning unit to an object plane on which an object is positioned; and at least one light condensing unit that is mounted on the outside of the projection unit along an optical axis different from the optical axis of the projection unit and detects the light beam reflected by the object. According to the invention, a large-area high-resolution scanning holographic camera can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a large-area scanning holography camera system using a separated condensing unit, and more particularly, to a large-area scanning holography camera system using a separated condensing unit and capable of capturing a large-area scanning hologram at a high resolution. BACKGROUND

[0002] A conventional optical scanning holography camera uses an interferometer to acquire a hologram of an object by forming a spatially distributed beam pattern having Fresnel zone plates, projecting the beam pattern onto the object through a scanning mirror, and collecting a light beam reflected by the object.

[0003] However, in such a conventional method, the size of the Fresnel zone plates must be smaller than the size of the reflecting surface of the scanning mirror, and the target area to be captured is determined by the scanning angle range of the scanning mirror and the distance from the object, so it is difficult to capture a large-area high-resolution hologram.

[0004] The technology underlying the present application is disclosed in Korean Patent No. 1304695 (published on September 6, 2013). SUMMARY TECHNICAL PROBLEM

[0005] The present application aims to provide a large-area scanning holography camera system using a separated condensing unit, which can implement a large-area high-resolution scanning holography camera. TECHNICAL SOLUTION

[0006] The present application provides a large-area scanning holography camera system, including: a scanning beam generation unit configured to modulate a phase of a first light beam split from a light source, convert the first light beam into a first curvature light beam through a first light beam curvature generation unit, convert a second light beam into a second curvature light beam through a second light beam curvature generation unit, and form an interference between the first curvature light beam and the second curvature light beam to form a scanning light beam; a scanning unit configured to receive the scanning light beam and project the scanning light beam onto an object, and transfer the scanning light beam to the object by controlling a scanning position of the scanning light beam with respect to the object in a horizontal direction and a vertical direction; a projection unit including a scanning lens and an imaging lens system, and configured to project the scanning light beam received from the scanning unit onto an object plane where the object is located; and at least one condensing unit installed outside the projection unit, having an optical axis different from that of the projection unit, and configured to detect a light beam reflected by the object.

[0007] Further, the condensing unit can include a condensing lens system provided with an optical axis different from the optical axis of the projection unit and receiving the light beam reflected by the object, and a light detector configured to detect the light beam passing through the condensing lens system.

[0008] Further, the condensing unit can rotate an angle of the following equation with respect to the optical axis of the projection unit based on an intersection point of the optical axis of the projection unit and the object plane .

[0009]

[0010] wherein, denotes a distance between the imaging lens system in the projection unit and the condensing lens system in which the incident light beam enters, and denotes a distance between the imaging lens system and the object.

[0011] A plurality of condensing units can be installed around the projection unit with different optical axes, and electrical signals of the multiplexed light beams detected by the plurality of condensing units can be merged by a signal merging processor and then transmitted to a PC for holographic image processing, or the electrical signals of the multiplexed light beams detected by the plurality of condensing units are transmitted to a PC for signal merging and holographic image processing.

[0012] Further, the imaging lens system can image a scanning light beam pattern reaching an imaging plane of the imaging lens system on the object plane where the object is located.

[0013] Further, the scanning unit can transfer the scanning light beam to a field plane of the scanning lens, and the scanning light beam has an optical axis inclined with respect to an optical axis of the scanning lens according to a scanning angle of an x-scan unit and a y-scan unit for controlling the scanning position in the horizontal direction and the vertical direction.

[0014] Further, in a case where the field plane of the scanning lens and the imaging plane of the imaging lens system are located at the same position, the following equation can be satisfied.

[0015]

[0016] wherein, denotes a ray angle of a chief ray on the imaging plane of the imaging lens system when a plane coordinate system on the imaging plane of the imaging lens system is referred to as x-y, and denotes a ray angle of the scanning light beam on the field plane of the scanning lens when a plane coordinate system on the field plane of the scanning lens is referred to as x-y.

[0017] Further, in a case where a position of a field plane of the scan lens is different from a position of an imaging plane of the imaging lens system and the field plane and the imaging plane are spaced apart by a set distance, the following equation can be satisfied.

[0018]

[0019] wherein, represents a distance between the field plane of the scan lens and the imaging plane of the imaging lens system, represents a ray angle of a chief ray on the imaging plane of the imaging lens system when a plane coordinate system on the imaging plane of the imaging lens system is referred to as x-y, and represents a ray angle of a scan beam on the field plane of the scan lens when a plane coordinate system on the field plane of the scan lens is referred to as x-y.

[0020] Further, a field size on the field plane of the scan lens can be determined by a front focal length of the scan lens and a scan angle through the following equation.

[0021]

[0022] wherein, D field is a field size on the field plane of the scan lens and is less than or equal to a field size on the imaging plane of the imaging lens system, f FFL represents a front focal length of the scan lens, and represents a maximum scan half angle which is a scan angle of the scan lens.

[0023] Further, the projection unit can further include an optical axis conversion lens arranged between the scan lens and the imaging lens system and configured to align an optical axis center of the scan lens with an optical axis center of the imaging lens system.

[0024] Further, the projection unit can be implemented in a structure selected from the following structures: a first structure including a telecentric scanning lens in which the angle of light rays is 0° on a field plane, the optical axis conversion lens, and an imaging lens system in which the angle of chief rays is greater than or equal to 0° on an imaging plane; a second structure including a telecentric scanning lens, the optical axis conversion lens, and an imaging lens system in which the angle of chief rays is less than or equal to 0° on the imaging plane; a third structure including a scanning lens in which the angle of light rays is greater than or equal to 0° on the field plane, the optical axis conversion lens, and an imaging lens system in which the angle of chief rays is greater than or equal to 0° on the imaging plane; a fourth structure including a scanning lens in which the angle of light rays is greater than or equal to 0° on the field plane, the optical axis conversion lens, and an imaging lens system in which the angle of chief rays is less than or equal to 0° on the imaging plane; a fifth structure including a scanning lens in which the angle of light rays is less than or equal to 0° on the field plane, the optical axis conversion lens, and an imaging lens system in which the angle of chief rays is greater than or equal to 0° on the imaging plane; and a sixth structure including a scanning lens in which the angle of light rays is less than or equal to 0° on the field plane, the optical axis conversion lens, and an imaging lens system in which the angle of chief rays is less than or equal to 0° on the imaging plane.

[0025] Further, in a case where the field plane of the scanning lens and the object plane of the optical axis conversion lens are located at the same position, the following equation can be satisfied.

[0026]

[0027] wherein, represents the angle of chief rays on the object plane of the optical axis conversion lens when a plane coordinate system on the object plane of the optical axis conversion lens is referred to as x-y, and represents the angle of scanning light beams on the field plane of the scanning lens when a plane coordinate system on the field plane of the scanning lens is referred to as x-y.

[0028] Further, in a case where the field plane of the scanning lens and the object plane of the optical axis conversion lens are located at different positions and the field plane and the object plane are spaced apart by a certain distance, the following equation can be satisfied.

[0029]

[0030] wherein, represents a distance between the field plane of the scanning lens and the object plane of the optical axis conversion lens, When a plane coordinate system on the object plane of the optical axis conversion lens is referred to as x-y, a ray angle of a chief ray on the object plane of the optical axis conversion lens, and When a plane coordinate system on the field plane of the scanning lens is referred to as x-y, a ray angle of a scanning beam on the field plane of the scanning lens.

[0031] Further, in a case where the imaging plane of the optical axis conversion lens and the imaging plane of the imaging lens system are located at the same position, the following equation can be satisfied.

[0032]

[0033] wherein, When a plane coordinate system on the imaging plane of the imaging lens system is referred to as x-y, a ray angle of a chief ray on the imaging plane of the imaging lens system, and When a plane coordinate system on the imaging plane of the optical axis conversion lens is referred to as x-y, a ray angle of a scanning beam on the imaging plane of the optical axis conversion lens.

[0034] Further, in a case where the imaging plane of the optical axis conversion lens and the imaging plane of the imaging lens system are located at the same position, the following equation can be satisfied.

[0035]

[0036] wherein, a distance between the imaging plane of the optical axis conversion lens and the imaging plane of the imaging lens system, When a plane coordinate system on the imaging plane of the imaging lens system is referred to as x-y, a ray angle of a chief ray on the imaging plane of the imaging lens system, and When a plane coordinate system on the imaging plane of the optical axis conversion lens is referred to as x-y, a ray angle of a scanning beam on the imaging plane of the optical axis conversion lens. Advantages of the Invention

[0037] According to the present application, a high-resolution scanning holography camera for a large area can be implemented. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a diagram showing a configuration of a large-area scanning holography camera system according to a first embodiment of the present application.

[0039] Figure 2 is a diagram specifically showing Figure 1FIG. 1 is a diagram showing the configuration of a projection unit.

[0040] Figure 3 FIG. 2 is a diagram showing the configuration of a large-area scanning holography camera system according to a second embodiment of the present application.

[0041] Figure 4 FIG. 3 is a diagram specifically showing Figure 3 FIG. 4 is a diagram showing the configuration of a projection unit.

[0042] Figure 5 FIG. 5 is a diagram showing the ray angle of light in an optical system.

[0043] Figure 6 FIG. 6 is a diagram showing the position where a condensing lens system is axially shifted with respect to the optical axis of an imaging lens system in an embodiment of the present application.

[0044] Figure 7 FIG. 7 is a diagram showing a modification of a condensing unit according to an embodiment of the present application.

[0045] Figure 8 and Figure 9 FIG. 8 is a diagram showing an example of the process of generating a holographic image by combining signals acquired by a plurality of condensing units in an embodiment of the present application. DETAILED DESCRIPTION

[0046] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present application pertains can easily implement the present application. However, the present application can be implemented in various different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present application in the accompanying drawings, portions unrelated to the description have been omitted, and like reference numerals are used to refer to like elements throughout the specification.

[0047] Throughout the specification, when referring to a certain component being "connected" to another component, not only a case where the two are "directly connected" is included, but also a case where the two are "electrically connected" via other elements is included. In addition, when referring to a certain component "including or comprising" a certain component, unless explicitly stated otherwise, the presence of other components is not excluded, but the possibility of the presence of additional components is included.

[0048] The present application relates to a large-area scanning holography camera system employing a separated condensing unit, and proposes a scanning holography camera system having a structure in which a projection unit and a condensing unit are separated, and capable of realizing a large-area high-resolution scanning holography camera.

[0049] Hereinafter, a large-area scanning holography camera system employing a separated condensing unit according to an embodiment of the present application will be described in more detail with reference to the accompanying drawings.

[0050] AsFigure 1 As shown, the large-area scanning holography camera system 100 according to the first embodiment of the present application includes a scanning beam generating unit 110, a scanning unit 120, a projecting unit 130, and a condensing unit 140. This basic structure is also applicable to the second embodiment.

[0051] First, the scanning beam generating unit 110 frequency-shifts the first light beam among the first and second light beams split from a light source, converts the first light beam into a first curvature light beam through a first lens 115, and converts the second light beam into a second curvature light beam through a second lens 116, and then causes the first and second curvature light beams to interfere with each other, thereby forming a scanning light beam.

[0052] The scanning beam generating unit 110 employs a Mach-Zehnder interferometer structure that splits the light source into the first and second light beams, generates the first and second curvature light beams, and then recombines the two generated light beams.

[0053] The scanning beam generating unit 110 includes a first mirror Ml, a beam splitter 111, a frequency-shifting device 112, a second mirror M2 and a third mirror M3, a first light beam curvature generating unit Nl and a second light beam curvature generating unit N2, and an interference device 117, and can further include a light source.

[0054] The light source is a component that generates electromagnetic waves. The light source can include various devices such as a laser generator capable of generating electromagnetic waves, a light emitting diode (LED), a unit that generates a low-coherence light beam such as a halogen light having a short coherence length, etc. Hereinafter, a typical example in which the light source is implemented as a laser generator is provided.

[0055] The light beam output from the light source is transferred to the first mirror Ml, and is input to the beam splitter 111 after being reflected.

[0056] The beam splitter 111 splits the incident light beam into the first and second light beams, transfers the first light beam to the phase modulation device 112 (acousto-optic modulator), and transfers the second light beam to the third mirror M3. That is, in the beam splitter 111, the light beam along the path of the first light beam is transferred to the phase modulation device 112, and the light beam along the path of the second light beam is transferred to the third mirror M3.

[0057] Here, the beam splitter 111 can be constituted by a fiber coupler, a beam splitter, a geometric phase lens, a diffractive optical element, etc., and can also be implemented to transfer the light beam to the outside through free space. Here, in the case where a device capable of achieving coaxial splitting such as a geometric phase lens is employed, the light beam can be split into coaxial first and second light beams. Hereinafter, it is assumed that each optical splitting device is implemented in the form of a beam splitter.

[0058] The phase modulation device 112 frequency shifts the first light beam and transfers the first light beam to the second mirror M2. The frequency shifting device, i.e., the phase modulation device, can shift the frequency of the first light beam by an amount of Ω using a frequency generated by a function generator (not shown) and transfer the first light beam to the second mirror M2. Here, the phase modulation device can be implemented as various types of modulators including an acousto-optic modulator and an electro-optic modulator, etc., and modulates the phase of light according to an electrical signal.

[0059] The first light beam reflected from the second mirror M2 is transferred to the first light beam curvature generating unit N1. The second light beam reflected from the third mirror M3 is transferred to the second light beam curvature generating unit N2. The beam expander can be implemented as a collimator.

[0060] The first light beam curvature generating unit N1 and the second light beam curvature generating unit N2 respectively receive corresponding light beams, collimate the light beams, and generate expanded light beams having a curvature range from a negative curvature to a positive curvature.

[0061] A specific implementation example of the first light beam curvature generating unit N1 is a beam expander including a first lens 113 that converts the first light beam reflected by the second mirror M2 into a spherical wave and a second lens 115 that receives the spherical wave and generates a light beam having a curvature (a first curvature light beam) and adjusts the curvature of the light beam by adjusting the distance between the first lens 113 and the second lens 115. A specific implementation example of the second light beam curvature generating unit N2 is a beam expander including a third lens 114 that converts the second light beam reflected by the third mirror M3 into a spherical wave and a fourth lens 116 that receives the spherical wave and generates a light beam having a curvature (a second curvature light beam) and adjusts the curvature of the light beam by adjusting the distance between the third lens 114 and the fourth lens 116.

[0062] The first light beam curvature generating unit N1 converts the first light beam into a first curvature light beam and transfers the first curvature light beam to the interference device 117. That is, the first light beam curvature generating unit N1 modulates the spatial distribution of the first light beam to generate the first curvature light beam.

[0063] The second light beam curvature generating unit N2 converts the second light beam into a first curvature light beam and transfers the first curvature light beam to the interference device 117. That is, the second light beam curvature generating unit N2 modulates the spatial distribution of the second light beam to generate the second curvature light beam.

[0064] The generated first and second curvature beams interfere with each other while passing through the interference device 117, and are transferred to the scanning unit 130. The interference device 117 can be implemented as a beam splitter.

[0065] The interference device 117 superimposes and interferes the first beam (first curvature beam) passing through the first beam curvature generating unit Nl with the second beam (second curvature beam) passing through the second beam curvature generating unit N2 to form a scanning beam having an interference pattern of a Fresnel zone pattern. Here, it is preferable to align the optical axis of the first curvature beam with the optical axis of the second curvature beam.

[0066] Thus, the scanning beam generating unit 110 converts the first and second beams separated from the light source into the first and second curvature beams, superimposes the first and second curvature beams with each other by the interference device 117, forms a scanning beam, and transfers the formed scanning beam to the scanning unit 120.

[0067] The beam incident to the scanning unit 120 can be transferred to the projection unit 130 by an x-scan unit (e.g., a horizontal scan mirror) and a y-scan unit (e.g., a vertical scan mirror).

[0068] The scanning unit 120 can include a horizontal scan mirror 121 (hereinafter, "x-scan mirror") and a vertical scan mirror 122 (hereinafter, "y-scan mirror") to control the scan position of the scanning beam with respect to an object in horizontal and vertical directions. The scanning unit 120 controls the incident scanning beam in the horizontal direction (x direction) and the vertical direction (y direction) using scan mirrors, and transfers the scanning beam to the projection unit.

[0069] In an embodiment of the present application, the scanning unit 120 employs a mirror scanner. The mirror scanner is composed of an x-y scanner including an x-scan mirror 121 that scans an object (transmissive body) in the x direction (left-right direction) about a y axis and a y-scan mirror 122 that scans the object (transmissive body) in the y direction (up-down direction) about an x axis. Of course, the scanning unit of the present application is not limited to the mirror scanner, and similar devices or other known scanning devices can also be employed. For example, an x-space modulation scanner and a y-space modulation scanner can be employed instead of the above-described x-scan mirror and y-scan mirror.

[0070] Thus, the scanning unit 120 controls the incident scanning beam in the horizontal direction (x direction) and the vertical direction (y direction) to incline the optical axis of the beam after superimposing the first and second curvature beams with respect to the optical axis of the scan lens 131 of the projection unit 130, and transfers the scanning beam to the projection unit 130.

[0071] Here, the scanning unit 120 can transfer the scanning light beam, whose optical axis is tilted with respect to the optical axis of the scanning lens 131 according to the scanning angles of the x-scan mirror and the y-scan mirror that control the scanning positions in the horizontal and vertical directions, to the field plane of the scanning lens 131.

[0072] The projection unit 130 includes the scanning lens 131 and the imaging lens system 132 that are sequentially disposed between the scanning unit 120 and the object. The projection unit 130 can project the scanning light beam received from the scanning unit 120 to the object plane of the imaging lens system 132 where the object is located.

[0073] The projection unit 130 is implemented as a 4-f relay lens system that is combined between the x-scan mirror 121 and the y-scan mirror 122 without a focal point, so that the rotation axis of the x-scan mirror 121 and the rotation axis of the y-scan mirror 122 can be located at the entrance pupil of the scanning lens. In the case where the 4-f relay system is not used, the entrance pupil of the scanning lens is preferably located between the x-scan mirror and the y-scan mirror. Here, the rotation axis of the scan mirror is preferably located at the entrance pupil of the scanning lens, and is preferably positioned orthogonal to the optical axis of the scanning lens.

[0074] The scanning lens 131 can be used to make the optical axis of the scanning light beam, which is obtained by superimposing the first curvature light beam and the second curvature light beam transferred to the entrance pupil of the scanning lens 131, located at a position away from the optical axis of the scanning lens 131 on the field plane of the scanning lens 131 by tilting the optical axis with respect to the optical axis of the scanning lens 131 according to the angles of the scan mirrors. Here, the scanning lens 131 can be implemented as a lens capable of performing the above function, such as an f-theta scanning lens or a telecentric f-theta lens.

[0075] Figure 2 is a diagram specifically illustrating Figure 1 the configuration of the projection unit shown in FIG. 1.

[0076] As Figure 2 illustrated, the optical axis of the scanning light beam located on the field plane of the scanning lens 131 can have an angle of light ray ranging from -90° to 90° with respect to the optical axis of the scanning lens 131.

[0077] Specifically, when a plane coordinate system of the field plane in which the intersection of the field plane of the scanning lens 131 and the optical axis of the scanning lens 131 is set as the origin is referred to as x-y, the angle of the scanning light beam on the field plane of the scanning lens 131 is expressed as .

[0078] Here, the ray angle of the scanning light beam on the field plane of the scanning lens 131 can be a function of the position on the plane of the field plane (a plane orthogonal to the optical axis of the scanning lens at the position of the field plane) or can be a constant. That is, the ray angle of the scanning light beam on the field plane of the scanning lens 131 can be defined as a function of the position (x, y) on the plane as , or can also be defined as a constant value as .

[0079] In the case where the scanning lens 131 is implemented as a telecentric scanning lens, the ray angle of the light emitted from the field plane of the scanning lens 131 with respect to the in-plane position of the field plane is a constant 0°, that is, emitted along , and is parallel to the optical axis of the scanning lens regardless of the in-plane position of the field plane.

[0080] In the case where the scanning lens 131 is implemented as an f-theta scanning lens, the ray angle of the light emitted from the field plane of the scanning lens 131 is a function that varies depending on the in-plane position of the field plane, that is, . In addition to this, a scanning lens of various configurations can also be employed.

[0081] The light beam after the superposition of the first curvature light beam and the second curvature light beam, that is, the scanning light beam is transferred to the field plane of the scanning lens 131, and then to the image plane (hereinafter, referred to as the imaging plane) of the imaging lens system 132. Here, it is preferable to align the optical axis of the scanning lens 131 with the optical axis of the imaging lens system 132. The imaging lens system 132 transfers the scanning light beam reaching the imaging plane to the object plane of the imaging lens system 132. Here, the object is located within the region where the imaged scanning light beam is present.

[0082] When a plane coordinate system on the imaging plane in which the intersection of the imaging plane of the imaging lens system 132 and the optical axis of the imaging lens system 132 is set as the origin is referred to as x-y, the angle of the chief ray on the imaging plane of the imaging lens system 132 is expressed as .

[0083] Here, the ray angle of the chief ray on the imaging plane of the imaging lens system 132 for imaging a large-area object can be a function of the position on the plane of the imaging plane of the imaging lens system 132 or can be a constant. That is, the ray angle can also be , or can also be .

[0084] In the case where the imaging lens system 132 is implemented as a telecentric imaging lens system, the ray angle of the chief ray on the imaging plane with respect to the imaging plane position of the imaging lens system 132 is a constant 0°, that is, , and is parallel to the optical axis of the imaging lens system 132 regardless of the in-plane position of the imaging plane.

[0085] In the case where the imaging lens system 132 is implemented as a regular imaging lens system, the angle of the chief ray on the imaging plane is a function that varies depending on the in-plane position of the imaging plane, that is, .

[0086] In the first embodiment of the present application, the ray angle of the optical axis of the scan light beam transferred from the field plane of the scan lens 131 to the imaging plane of the imaging lens system 132 is preferably aligned with the optical axis of the chief ray of the imaging lens system 132.

[0087] As Figure 2 indicated, in the case where the field plane of the scan lens 131 and the imaging plane of the imaging lens system 132 are located at the same position, it is preferable to satisfy the following equation 1.

[0088] [Equation 1]

[0089] Here, when a plane coordinate system on the imaging plane of the imaging lens system 132 is referred to as x-y, indicates the ray angle of the chief ray on the imaging plane, and when a plane coordinate system on the field plane of the scan lens 131 is referred to as x-y, indicates the ray angle of the scan light beam on the field plane.

[0090] As described above, equation 1 can be a function of the plane, like , or can be a constant, like .

[0091] In the case where the position of the field plane of the scan lens 131 and the position of the imaging plane of the imaging lens system 132 are different and the two planes are spaced apart by a certain distance, it is preferable to satisfy the following equation 2.

[0092] [Equation 2]

[0093] Here, indicates the distance between the field plane of the scan lens 131 and the imaging plane of the imaging lens system 132. Also, according to equation 1, equation 2 can be a function of the plane, like , or can be a constant of the plane, like .

[0094] Thus, the imaging lens system 132 images the scan beam pattern reaching its imaging plane onto the object plane where the object is located.

[0095] Here, the object located on the object plane can be scanned by moving the optical axis of the scan beam imaged on the object plane of the imaging lens system 132 to a position horizontally deviated from the optical axis of the imaging lens system 132 according to the scan of the scan unit 120.

[0096] At this time, in the case where the scan beam on the field plane of the scan lens 131 and the imaging plane of the imaging lens system 132 satisfies Equation 1 or Equation 2, the ray angle of the optical axis of the scan beam at the scan position of the scan beam reaching the object plane is aligned with the ray angle of the chief ray of the imaging lens system 132 at the corresponding position, so that the distortion of the scan beam due to the mismatch of the ray angles can be eliminated. At this time, the ray angle of the chief ray on the object plane of the imaging lens system 132 is preferably greater than or equal to 0° in the direction deviated from the optical axis to scan the Fresnel zone plate of the object greater than or equal to the pupil size of the imaging lens system 132.

[0097] The field size D of the field plane of the scan lens 131 field The field size D of the field plane of the scan lens 131 can be determined by Equation 3 below. FFL and the scan angle .

[0098] [Equation 3]

[0099] Here, the scan angle of the scan lens 131 indicates the maximum scan half angle. The field size of the scan lens 131 must be equal to or smaller than the field size of the imaging plane of the imaging lens system 132, and preferably equal. When the field size of the scan lens 131 is large, vigneting occurs in the imaging lens system 132, resulting in image distortion in the edge region, and the field size plays a key role in solving this problem.

[0100] The condensing unit 140 detects the light beam reflected by the object irradiated by the scan beam. At least one condensing unit 140 can be installed at the outer periphery of the projection unit 130, and the optical axis of the condensing unit 140 is different from the optical axis of the projection unit 130.

[0101] The condensing unit 140 can include a condensing lens system and a light detector. The structure of the condensing unit 140 can have various forms.

[0102] Specifically, as Figure 1As shown, the light collecting unit 140 can include a light collecting lens system (light collecting optical system) 141 and a light detector 143.

[0103] The light collecting lens system 141 is installed with an optical axis different from that of the projection unit 130, and can receive a light beam reflected by the object, converge the light beam, and transfer the converged light beam to the light detector 143. The light collecting lens system 141 can adopt a transmissive optical system or a reflective optical system, and can be located at a position different from the optical axis of the imaging lens system 132. Here, the transmissive optical system is made of an optical glass or a plastic material allowing the wavelength of the laser light source to pass through, and serves to refract and focus the light rays on the light detector 143. The reflective optical system is made of a glass or a metal having a reflective coating allowing the laser wavelength to be reflected therefrom, and can be implemented as an off-axis parabolic mirror, a spherical mirror, a parabolic mirror, etc. In addition, the light collecting lens system 141 is also implemented as a combination of the reflective optical system and the transmissive optical system.

[0104] Here, a bandpass filter (BPF) 142 can be used between the light collecting lens system 141 and the light detector 143 to prevent light rays having a wavelength different from that of the light source of the laser used from being incident to the light collecting unit 140.

[0105] The light detector 143 detects the light beam passing through the light collecting lens system 141, and is implemented as a photodiode, an avalanche photodiode, a silicon photomultiplier, a photomultiplier tube, etc.

[0106] In this way, the light collecting unit 140 images the object by imaging the light beam reflected by the object via the imaging lens system 132 on the detection plane of the light detector 143, and spatially integrating and converging the light intensity of the image imaged on the detection plane. Here, the detection plane can be located not only on the focal plane of the imaged image, but also on the defocus plane of the imaged image.

[0107] The light collecting unit 140 detects the light intensity of the image on the detection plane of the light detector 143 by collecting the light rays in a manner of generating an electrical signal proportional to the total light quantity. As shown, Figure 1 As shown, the light collecting unit 140 can be installed at a position having an angle of reflection greater than 0° with respect to the light beam projected onto the object by the projection unit 130.

[0108] In the scanning lens according to the conventional optical design method, the light ray angle of the scanning optical axis on the field plane of the scanning lens is greater than or equal to 0°, and the light ray angle of the chief ray on the image plane of the imaging lens system is less than or equal to 0°.

[0109] Therefore, in the case where a projection unit is made by combining a commercially available scanning lens designed according to a conventional optical design method with a commercially available imaging lens system, since the scanning optical axis of the scanning lens and the optical axis of the chief ray of the imaging lens system are not aligned, distortion and a limited scanning field of view appear on the object plane of the scanning beam pattern which is a beam obtained by superimposing the first curvature beam and the second curvature beam.

[0110] To solve this problem, the following projection unit 230 according to a second embodiment of the present application has a structure in which an optical axis conversion lens 133 is additionally provided between a scanning lens 131 and an imaging lens system 132. The above configuration will be described below in six cases (Cases 1 to 6). Figure 3

[0111] Figure 3 is a view showing the configuration of a large-area scanning holography camera system according to the second embodiment of the present application.

[0112] As shown in Figure 3 , the large-area scanning holography camera system 100 according to the second embodiment includes a scanning beam generation unit 110, a scanning unit 120, a projection unit 230, and a condensing unit 140. The repeated description of components having the same reference numerals as those in Figure 1 will be omitted.

[0113] As described above, in the second embodiment, the projection unit 230 has a structure including the scanning lens 131, the optical axis conversion lens 133, and the imaging lens system 132. Here, the optical axis conversion lens 133 is arranged between the scanning lens 131 and the imaging lens system 132 to align the optical axis center of the scanning lens 131 with the optical axis center of the imaging lens system 132.

[0114] In the second embodiment, the scanning lens 131 can be implemented as a telecentric scanning lens whose ray angle on the field plane is 0°, a non-telecentric conventional scanning lens whose ray angle on the field plane is greater than or equal to 0°, or a conventional scanning lens whose ray angle on the field plane is less than or equal to 0°. Here, "greater than or equal to 0°" can mean an angle greater than 0°, and "less than 0°" can mean an angle less than 0°.

[0115] Further, the imaging lens system 132 can be implemented as an imaging lens system whose ray angle of the chief ray on the imaging plane is greater than or equal to 0° or by an imaging lens system whose ray angle of the chief ray on the imaging plane is less than or equal to 0°. Here, "greater than or equal to 0°" can mean an angle greater than 0°, and "less than 0°" can mean an angle less than 0°.​

[0116] Here, based on the combination of the above-described embodiments of the scan lens 131 and the imaging lens system 132, the projection unit 230 can be classified into the following six cases.

[0117] Case 1: Telecentric scan lens, optical axis conversion lens, and imaging lens system in which the ray angle of the chief ray on the imaging plane is greater than or equal to 0° (first structure)

[0118] Case 2: Telecentric scan lens, optical axis conversion lens, and imaging lens system in which the ray angle of the chief ray on the imaging plane is less than or equal to 0° (second structure)

[0119] Case 3: Scan lens in which the ray angle on the field plane is greater than or equal to 0°, optical axis conversion lens, and imaging lens system in which the ray angle of the chief ray on the imaging plane is greater than or equal to 0° (third structure)

[0120] Case 4: Scan lens in which the ray angle on the field plane is greater than or equal to 0°, optical axis conversion lens, and imaging lens system in which the ray angle of the chief ray on the imaging plane is less than or equal to 0° (fourth structure)

[0121] Case 5: Scan lens in which the ray angle on the field plane is less than or equal to 0°, optical axis conversion lens, and imaging lens system in which the ray angle of the chief ray on the imaging plane is greater than or equal to 0° (fifth structure)

[0122] Case 6: Scan lens in which the ray angle on the field plane is less than or equal to 0°, optical axis conversion lens, and imaging lens system in which the ray angle of the chief ray on the imaging plane is less than or equal to 0° (sixth structure)

[0123] That is, the projection unit 230 can be implemented in a structure selected from the above-described first structure to the sixth structure.

[0124] Figure 4 is a diagram specifically illustrating Figure 3 the configuration of the projection unit shown in FIG. 1.

[0125] As Figure 4 indicated in FIG. 2, the optical axis of the scan light beam on the field plane of the scan lens 131 can have a ray angle of between -90° and 90° with respect to the optical axis of the scan lens 131.

[0126] Specifically, when a plane coordinate system on the field plane of the scan lens 131 in which the intersection of the field plane of the scan lens 131 and the optical axis of the scan lens 131 is set as the origin is referred to as x-y, the angle of the scan light beam on the field plane of the scan lens 131 is expressed as .

[0127] Here, the ray angle of the scanning light beam on the field plane of the scanning lens 131 can be a function of the position on the plane of the field plane (a plane orthogonal to the optical axis of the scanning lens at the position of the field plane) or can be a constant. That is, the ray angle of the scanning light beam on the field plane of the scanning lens 131 can be defined as a function of the position on the plane as , or can be defined as a constant value as .

[0128] In the case where the scanning lens 131 is implemented as a telecentric scanning lens, the ray angle of the light emitted from the field plane of the scanning lens 131 with respect to the in-plane position of the field plane is a constant 0°, that is, the light is emitted along , and is parallel to the optical axis of the scanning lens regardless of the in-plane position of the field plane.

[0129] In the case where the scanning lens 131 is implemented as an f-theta scanning lens, the ray angle of the light emitted from the field plane of the scanning lens 131 becomes a function that varies depending on the in-plane position of the field plane, that is, . A scanning lens of various configurations can also be employed.

[0130] In the configuration of the second embodiment, the light beam after the superposition of the first curvature light beam and the second curvature light beam, that is, the scanning light beam is transferred to the field plane of the scanning lens 131 and then to the object plane (image plane) of the optical axis conversion lens 133. Here, it is preferable to align the optical axis of the scanning lens 131 with the optical axis of the optical axis conversion lens 133.

[0131] When a plane coordinate system of the object plane in which the intersection of the object plane of the optical axis conversion lens 133 and the optical axis of the optical axis conversion lens is set as the origin is referred to as x-y, the ray angle of the chief ray on the object plane of the optical axis conversion lens 133 is expressed as .

[0132] Here, the ray angle of the chief ray on the object plane of the optical axis conversion lens 133 can be a function of the position on the plane of the object plane (a plane orthogonal to the optical axis of the scanning lens at the position of the object plane) or can be a constant. That is, the ray angle can be , or can be .

[0133] As shown in the conditions of Case 1 and Case 2, in the case where the scanning lens 131 is implemented as a telecentric scanning lens system, the ray angle of the chief ray on the field plane of the scanning lens 131 with respect to the field plane position of the scanning lens 131 is a constant 0°, that is, and the ray angle of the optical axis of the scan light beam transferred from the field plane of the scan lens 131 to the object plane of the optical axis conversion lens 133 is parallel to the optical axis of the optical axis conversion lens 133 regardless of the in-plane position on the object plane.

[0134] Obviously, in the case where the scan lens 131 is implemented as a regular scan lens rather than a telecentric scan lens, the ray angle of the light emitted from the field plane of the scan lens 131 becomes a function of the in-plane position of the field plane, i.e., .

[0135] In the second embodiment of the present application, the ray angle of the optical axis of the scan light beam transferred from the field plane of the scan lens 131 to the object plane of the optical axis conversion lens 133 is preferably aligned with the optical axis of the chief ray of the optical axis conversion lens 133.

[0136] As Figure 4 indicated, in the case where the field plane of the scan lens 131 and the object plane of the optical axis conversion lens 133 are located at the same position, it is preferable to satisfy the following equation 4.

[0137] [Equation 4]

[0138] Here, when the plane coordinate system on the object plane of the optical axis conversion lens 133 is referred to as x-y, represents the ray angle of the chief ray on the object plane, and when the plane coordinate system on the field plane of the scan lens 131 is referred to as x-y, represents the ray angle of the scan light beam on the field plane.

[0139] As with the case 3, 4, 5 and 6, the equation 4 can be a function of the plane, i.e., , or as with the case 1 and 2, it can also be a constant with respect to the plane, i.e., .

[0140] In the case where the position of the field plane of the scan lens 131 and the position of the object plane of the optical axis conversion lens 133 are different and the two planes are spaced apart by a certain distance, it is preferable to satisfy the following equation 5.

[0141] [Equation 5]

[0142] Here, represents the distance between the field plane of the scan lens 131 and the object plane of the optical axis conversion lens 133.

[0143] Likewise, according to the equation 4, in the case 3, 4, 5 and 6, the equation 5 can be a function of the plane, i.e., , and in the case 1 and 2, the equation 5 can be a constant with respect to the plane, i.e., .

[0144] The scan light beam reaching the imaging plane of the optical axis conversion lens 133 is transferred to the imaging plane of the imaging lens system 132. Here, the optical axis of the scan lens 131 is preferably aligned with the optical axis of the imaging lens system 132.

[0145] The imaging lens system 132 images the scan light beam reaching the imaging plane and transfers the scan light beam to the object plane of the imaging lens system 132. Here, the object is located in the region where the imaged scan light beam is located.

[0146] When a plane coordinate system of the imaging plane in which the intersection of the imaging plane of the imaging lens system 132 and the optical axis of the imaging lens system 132 is set as the origin is referred to as x-y, the ray angle of the chief ray on the imaging plane of the imaging lens system 132 is expressed as .

[0147] At this time, the ray angle of the chief ray on the imaging plane of the imaging lens system 132 imaging a large-area object can be a function of the position on the plane of the imaging plane of the imaging lens system 132 (a plane orthogonal to the optical axis of the scan lens at the imaging plane position), or can be a constant. That is, the ray angle can be , or also .

[0148] In the case where the imaging lens system 132 is implemented as a telecentric imaging lens system, the ray angle of the chief ray on the imaging plane with respect to the imaging plane position of the imaging lens system 132 is a constant 0°, that is, , and is parallel to the optical axis of the imaging lens system 132 regardless of the in-plane position on the imaging plane.

[0149] In the case where the imaging lens system 132 is implemented as a regular imaging lens system, the angle of the chief ray on the imaging plane becomes a function that varies according to the in-plane position of the imaging plane, that is, .

[0150] In the second embodiment of the present application, the ray angle of the optical axis of the scan light beam transferred from the field plane of the scan lens 131 to the imaging plane of the imaging lens system 132 is preferably aligned with the optical axis of the chief ray of the imaging lens system 132.

[0151] As shown in Figure 4 , in the case where the imaging plane of the optical axis conversion lens 133 and the imaging plane of the imaging lens system 132 are located at the same position, it is preferable to satisfy the following equation 6.

[0152] [Equation 6]

[0153] Here, when a plane coordinate system on the image plane of the imaging lens system is referred to as x-y, represents the ray angle of the chief ray on the imaging plane, and when a plane coordinate system on the image plane of the optical axis conversion lens is referred to as x-y, represents the ray angle of the scanning light beam on the imaging plane.

[0154] Formula 6 can be a function according to the plane, such as and the like, or can be a constant according to the plane, such as and the like.

[0155] When the position of the imaging plane of the optical axis conversion lens 133 is different from the position of the imaging plane of the imaging lens system 132 and the two planes are spaced apart by a set distance, it is preferable to satisfy the following formula 7.

[0156] [Formula 7]

[0157] Here, represents the distance between the imaging plane of the optical axis conversion lens 133 and the imaging plane of the imaging lens system 132. Based on formula 6, in the case 3, 4, 5, and 6 conditions, formula 7 can be a function according to the plane, such as and the like, and in the case 1 and 2 conditions, formula 6 can be a function according to the plane, such as and the like.

[0158] The imaging lens system 132 images the scanning light beam that reaches the imaging plane of the imaging lens system 132 on the object plane of the imaging lens system 132.

[0159] At this time, by satisfying the above formula 4 or formula 5 and the above formula 6 or formula 7, the ray angle of the optical axis of the scanning light beam aligns with the ray angle of the chief ray of the imaging lens system 132 at the scanning position of the scanning light beam that reaches the object plane, so that distortion of the scanning light beam due to misalignment between the ray angles can be eliminated. Likewise, the ray angle of the chief ray on the object plane of the imaging lens system 132 is preferably greater than or equal to 0° in the direction deviating from the optical axis, to scan the Fresnel zone plate on the object whose pupil size is greater than or equal to the pupil size of the imaging lens system 132.

[0160] Figure 5 is a diagram showing the ray angle of light in an optical system. As Figure 5 indicated in the above formula 1, the ray angle of light in the optical system can refer to the inclination angle of the ray propagating at an inclination angle with respect to the optical axis of the optical system. Figure 5 An example of the ray angle θ1 of the incident light beam with respect to the lens system and the ray angle θ2 of the emergent light beam is shown.

[0161] Figure 6 is a diagram showing a position in which the condensing lens system is axially shifted with respect to the optical axis of the imaging lens system in an embodiment of the present application.

[0162] Figure 6 The entrance surface of the condensing lens system 141 is shown to be spaced apart from the optical axis of the imaging lens system 132 by a distance from the optical axis, and the optical axis of the condensing lens system 141 is rotated with respect to the optical axis of the imaging lens system 132 by .

[0163] As Figure 6 shown, the optical axis of the condensing unit 140 can be rotated with respect to the optical axis of the projection unit 130 by as shown in Equation 8, based on the intersection of the optical axis of the projection unit 130 and the object plane.

[0164] [Equation 8]

[0165] Here, denotes the distance between the optical axis of the imaging lens system 132 in the projection unit 130 and the optical axis of the condensing lens system 141 in the condensing unit 140, and denotes the distance between the imaging lens system 132 and the object.

[0166] In an embodiment of the present application, the condensing unit 140 can be installed outside the projection unit 130 as Figure 1 and Figure 3 shown, but a plurality of condensing units can also be installed along the outer periphery of the projection unit 130.

[0167] Figure 7 is a diagram showing a modification example of the condensing unit according to an embodiment of the present application.

[0168] As Figure 7 shown, a plurality of condensing units #1 to #n can be installed around the imaging lens system 132 of the projection unit 130 with different optical axes and spaced apart from the imaging lens system 132 by a distance . The plurality of condensing units #1 to #n can be symmetrically arranged around the projection unit 130, or can also be asymmetrically arranged. Figure 7 The condensing unit of Figure 1 and Figure 3 constitutes the system 100 and 200.

[0169] Figure 8 and Figure 9 are diagrams showing flow examples in which a hologram image is generated by combining signals acquired by a plurality of condensing units in an embodiment of the present application.

[0170] The systems 100 and 200 according to the first and second embodiments of the present application can combine the electrical signals of the multiplexed light beams detected by the plurality of light collecting units 140 (specifically, the light detectors 143-1, 143-2,..., 143-N) through the signal combining processor 150, and then transmit the electrical signals to the PC 10 (10-1) for holographic image processing (see Figure 8 ), and in addition thereto, the systems can directly transmit the electrical signals of the multiplexed light beams detected by the plurality of light collecting units 140 (specifically, the light detectors 143-1, 143-2,..., 143-N) to the PC 10 (10-2) that can perform the signal combining and the holographic image processing (see Figure 9 ).

[0171] In the former case, as shown in Figure 8 , each of the systems 100 and 200 can further include the signal combining processor 150. In this case, the signal combining processor 150 directly receives and combines the signals from the plurality of light collecting units 140, and transmits the signals to the PC 10 (10-1). Subsequently, the PC 10 (10-1) can perform the holographic signal processing based on the received combined signals to generate the holographic image.

[0172] In the latter case, as shown in Figure 9 , the systems 100 and 200 can transmit the electrical signals of the multiplexed light beams detected by the plurality of light collecting units 140 to the PC 10 (10-2), respectively. Then, the PC 10 (10-2) can directly combine the received electrical signals of the multiplexed light beams, and perform the holographic signal processing to generate the holographic image. In addition, the systems 100 and 200 can be connected to the PC 10 through a wired network, a wireless network, or a hybrid wired-wireless network, respectively.

[0173] According to the present application described above, a high-resolution scanning holographic camera for a large area can be implemented by employing a scanning holographic camera system in which the projection unit is combined with the light collecting unit.

[0174] Although the present application has been described above with reference to the embodiments illustrated in the drawings, these embodiments are merely exemplary examples, and it will be understood by those skilled in the art that various modifications and equivalent alternative embodiments can be derived therefrom. Therefore, the actual technical scope of the present application should be determined by the technical concept of the appended claims.

Claims

1. A large-area scanning holographic camera system, comprising: The scanning beam generation unit is configured to modulate the phase of the first beam obtained from the beam splitting of the light source, convert the first beam into a first curvature beam through the first beam curvature generation unit, convert the second beam into a second curvature beam through the second beam curvature generation unit, and then cause the first curvature beam and the second curvature beam to interfere to form a scanning beam. A scanning unit is configured to receive the scanning beam and project the scanning beam onto the object, and to transfer the scanning beam to the object by controlling the scanning position of the scanning beam relative to the object in the horizontal and vertical directions; The projection unit includes a scanning lens and an imaging lens system, and is configured to project the scanning beam received from the scanning unit onto the object plane where the object is located; as well as At least one focusing unit is mounted outside the projection unit, its optical axis is different from that of the projection unit, and it is configured to detect the light beam reflected by the object.

2. The large-area scanning holographic camera system according to claim 1, wherein, The focusing unit includes: A condenser lens system, having an optical axis different from that of the projection unit, receives the light beam reflected by the object; and A photodetector is configured to detect the light beam passing through the condenser lens system.

3. The large-area scanning holographic camera system according to claim 1, wherein, The focusing unit is rotated by the following angle relative to the optical axis of the projection unit, based on the intersection of the optical axis of the projection unit and the object plane. : in, This indicates the distance between the imaging lens system in the projection unit and the condensing lens system into which the incident light beam enters in the condensing unit, and This indicates the distance between the imaging lens system and the object.

4. The large-area scanning holographic camera system according to claim 1, wherein, Multiple focusing units are mounted around the projection unit with different optical axes, and The electrical signals of the multiple beams detected by the multiple focusing units are combined by a signal combining processor and then transmitted to a PC for holographic image processing; or, the electrical signals of the multiple beams detected by the multiple focusing units are transmitted to a PC for signal combining and holographic image processing.

5. The large-area scanning holographic camera system according to claim 1, wherein, The imaging lens system images the scanning beam pattern arriving at the imaging plane of the imaging lens system onto the object plane where the object is located.

6. The large-area scanning holographic camera system according to claim 1, wherein, The scanning unit transfers the scanning beam to the field of view of the scanning lens. Based on the scanning angles of the x-scanning unit and the y-scanning unit used to control the scanning position in the horizontal and vertical directions, the scanning beam has an optical axis that is tilted relative to the optical axis of the scanning lens.

7. The large-area scanning holographic camera system according to claim 1, wherein, When the field of view plane of the scanning lens and the imaging plane of the imaging lens system are located at the same position, the following equation is satisfied: in, The term "xy" represents the angle of the principal ray on the imaging plane of the imaging lens system. The angle of the scanning beam on the field of view plane of the scanning lens is represented by the plane coordinate system called xy.

8. The large-area scanning holographic camera system according to claim 1, wherein, When the position of the field of view plane of the scanning lens is different from the position of the imaging plane of the imaging lens system, and the field of view plane and the imaging plane are separated by a set distance, the following equation is satisfied: in, This represents the distance between the field of view plane of the scanning lens and the imaging plane of the imaging lens system. The term "xy" represents the angle of the principal ray on the imaging plane of the imaging lens system. The angle of the scanning beam on the field of view plane of the scanning lens is represented by the plane coordinate system called xy.

9. The large-area scanning holographic camera system according to claim 1, wherein, The field of view size on the field of view plane of the scanning lens is determined by the front focal length and scanning angle of the scanning lens using the following formula: Among them, D field f is the field of view size on the field of view plane of the scanning lens, and is less than or equal to the field of view size on the imaging plane of the imaging lens system. FFL This indicates the front focal length of the scanning lens, and This represents the maximum half-angle of the scanning lens.

10. The large-area scanning holographic camera system according to claim 1, wherein, The projection unit further includes an optical axis conversion lens, which is arranged between the scanning lens and the imaging lens system and is configured to align the optical axis center of the scanning lens with the optical axis center of the imaging lens system.

11. The large-area scanning holographic camera system according to claim 10, wherein, The projection unit can be implemented using a structure selected from the following: The first structure includes a telecentric scanning lens with a light angle of 0° on the field of view plane, the optical axis conversion lens, and an imaging lens system with a light angle of the principal ray on the imaging plane greater than or equal to 0°. The second structure includes a telecentric scanning lens, the optical axis conversion lens, and an imaging lens system in which the angle of the principal ray on the imaging plane is less than or equal to 0°. The third structure includes a scanning lens with a light angle greater than or equal to 0° on the field of view plane, the optical axis conversion lens, and an imaging lens system with a light angle greater than or equal to 0° on the imaging plane of the principal ray. The fourth structure includes a scanning lens with a light angle greater than or equal to 0° on the field of view plane, the optical axis conversion lens, and an imaging lens system with a light angle of less than or equal to 0° on the imaging plane of the principal ray. The fifth structure includes a scanning lens with a light angle of less than or equal to 0° on the field of view plane, the optical axis conversion lens, and an imaging lens system with a light angle of greater than or equal to 0° on the imaging plane of the principal ray. as well as The sixth structure includes a scanning lens with a light angle of less than or equal to 0° on the field of view plane, the optical axis conversion lens, and an imaging lens system with a light angle of less than or equal to 0° on the imaging plane.

12. The large-area scanning holographic camera system according to claim 10, wherein, When the field plane of the scanning lens and the object plane of the optical axis conversion lens are located at the same position, the following equation is satisfied: in, When the plane coordinate system on the object plane of the optical axis conversion lens is called xy, the angle of the principal ray on the object plane of the optical axis conversion lens, and The angle of the scanning beam on the field of view plane of the scanning lens is defined as xy when the planar coordinate system on the field of view plane of the scanning lens is called xy.

13. The large-area scanning holographic camera system according to claim 10, wherein, When the position of the field plane of the scanning lens is different from the position of the object plane of the optical axis conversion lens, and the field plane and the object plane are separated by a set distance, the following formula is satisfied: in, This represents the distance between the field of view plane of the scanning lens and the object plane of the optical axis conversion lens. When the plane coordinate system on the object plane of the optical axis conversion lens is called xy, the angle of the principal ray on the object plane of the optical axis conversion lens, and The angle of the scanning beam on the field of view plane of the scanning lens is defined as xy when the planar coordinate system on the field of view plane of the scanning lens is called xy.

14. The large-area scanning holographic camera system according to claim 10, wherein, When the imaging plane of the optical axis conversion lens and the imaging plane of the imaging lens system are located at the same position, the following equation is satisfied: in, When the planar coordinate system on the imaging plane of the imaging lens system is called xy, the ray angle of the principal ray on the imaging plane of the imaging lens system, and When the planar coordinate system on the imaging plane of the optical axis conversion lens is called xy, the angle of the scanning beam on the imaging plane of the optical axis conversion lens.

15. The large-area scanning holographic camera system according to claim 10, wherein, When the position of the imaging plane of the optical axis conversion lens is different from the position of the imaging plane of the imaging lens system, and the imaging plane of the optical axis conversion lens and the imaging plane of the imaging lens system are separated by a set distance, the following formula is satisfied: in, This represents the distance between the imaging plane of the optical axis conversion lens and the imaging plane of the imaging lens system. When the planar coordinate system on the imaging plane of the imaging lens system is called xy, the ray angle of the principal ray on the imaging plane of the imaging lens system, and When the planar coordinate system on the imaging plane of the optical axis conversion lens is called xy, the angle of the scanning beam on the imaging plane of the optical axis conversion lens.

Images