Confocal optical imaging device
By designing collimation units, spectroscopy units, deflection units and telescopes in confocal optical imaging systems, the poor imaging quality of traditional systems in far-field super-resolution imaging and low-virtuality weather is solved, and high-quality super-resolution imaging is achieved.
Patent Information
- Application Number
- CN202510287665.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-04-18
AI Technical Summary
Traditional confocal optical imaging systems have poor imaging quality in far-field super-resolution imaging and low-virtual weather, and are susceptible to backscattered light and specular reflected light on the system.
A confocal optical imaging device is designed, including a collimation unit, a spectrometer, a deflection unit and a telescope. The laser beam is expanded through the collimation unit. The deflection unit and the telescope cooperate to focus the beam at different positions of the target object, and the echo beam is separated by the spectrometer to focus it on the output pinhole to form a conjugated imaging of point illumination-point detection.
Super-resolution imaging of long-distance targets in low-virtual weather is achieved, which reduces background noise interference, improves imaging quality, and maximizes the use of the telescope's focus capability, and improves the focus accuracy and imaging resolution of the beam.
Smart Images
Figure CN119846824A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optical imaging technology, and in particular to a confocal optical imaging device. Background Art
[0002] Traditional confocal optical imaging systems often use microscopes or CCDs to focus incident light, but in traditional confocal optical imaging systems, microscopes or CCDs are usually limited by the optical diffraction limit, making it difficult to achieve far-field super-resolution imaging. In addition, in complex low-visibility weather (i.e., weather with high concentrations of particulate matter scattering such as fog or smoke), traditional confocal optical imaging systems are easily disturbed by background noise such as backscattered light and system mirror reflection light, resulting in poor imaging quality. Summary of the invention
[0003] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a confocal optical imaging device.
[0004] In a first aspect, an embodiment of the present application provides a confocal optical imaging device, wherein the confocal optical imaging device includes a collimation unit, a light splitting unit, a deflection unit, and a telescope;
[0005] The collimating unit is used to expand the received laser beam to obtain a parallel emission beam, and the emission beam is incident on the telescope via the light splitting unit and the deflection unit;
[0006] The telescope is used to adjust the focus point of the emission light beam, focus the emission light beam on the target object, and receive the echo light beam returned from the target object;
[0007] The light splitting unit is used to split the emission light beam and the echo light beam, so that the emission light beam is focused on a certain point position of the target object, and the echo light beam is transmitted to the output pinhole after passing through the collimating unit to form a point-to-point conjugate imaging at the output pinhole;
[0008] The deflection unit is used to control the deflection direction of the emission light beam so as to focus the emission light beam on different positions of the target object.
[0009] In a possible implementation, the collimation unit includes a first collimation subunit and a second collimation subunit;
[0010] The first collimating subunit is connected to the light splitting unit, and the first collimating subunit is used to expand the received laser beam to obtain a parallel emission beam, and transmit the emission beam to the light splitting unit;
[0011] The second collimating subunit is coupled to the output pinhole, and is used for receiving the echo light beam split from the light splitting unit, and coupling the echo light beam to the output pinhole.
[0012] In a possible implementation, the output aperture of the output pinhole is consistent with the Airy disk diameter.
[0013] In a possible implementation, the confocal optical imaging device further includes a linear polarizer and a half-wave plate, and the linear polarizer and the half-wave plate are sequentially located between the first collimating subunit and the light splitting unit;
[0014] The linear polarizer is used to convert the emission light beam emitted by the first collimating subunit into an emission light beam in a linear polarization state, and the half-wave plate is used to adjust the polarization direction of the emission light beam in the linear polarization state to vertical polarization, and transmit the vertically polarized emission light beam to the spectroscopic unit.
[0015] In a possible implementation, the confocal optical imaging device further includes a first reflector assembly unit and a second reflector assembly unit;
[0016] The first reflector assembly unit is located between the half-wave plate and the beam splitter unit, and the first reflector assembly unit is used to adjust the transmission optical path of the emission light beam so that the emission light beam is transmitted to the beam splitter unit;
[0017] The second reflector assembly unit is located between the light splitting unit and the second collimating sub-unit, and the second reflector assembly unit is used to adjust the transmission optical path of the echo light beam so that the echo light beam is transmitted to the second collimating sub-unit.
[0018] In a possible implementation, the first reflector assembly unit includes at least a first reflector, and the emission light beam emitted by the half-wave plate is transmitted to the light splitting unit via the first reflector;
[0019] The second reflector assembly unit includes at least a second reflector and a third reflector, and the second reflector and the third reflector are arranged in sequence between the spectroscopic unit and the second collimating subunit, and the echo light beam emitted by the spectroscopic unit reaches the second collimating subunit via the second reflector and the third reflector in sequence.
[0020] In a possible implementation, the confocal optical imaging device further includes a coupling unit;
[0021] The coupling unit is located between the light splitting unit and the second collimating subunit, and is used for focusing the echo light beam emitted by the light splitting unit and transmitting the focused echo light beam to the second collimating subunit.
[0022] In a possible implementation, the confocal optical imaging device further includes a filtering unit, where the filtering unit is located between the coupling unit and the second collimating subunit, and the filtering unit is used to filter the echo light beam.
[0023] In a possible implementation, the light splitting unit includes a beam splitting cube, a perforated reflector, a perforated reflector, or a centrally coated mirror.
[0024] In a possible implementation, the magnification of the telescope is 2-35.
[0025] Based on any of the above aspects, the confocal optical imaging device provided in the embodiment of the present application includes a collimation unit, a spectroscopic unit, a deflection unit and a telescope. The deflection unit and the telescope cooperate to focus the incident light beam on different positions of the target object to achieve point illumination of the target object, and at the same time receive the echo light beam returned from the target object, and separate the echo light beam through the spectroscopic unit, so that the echo light beam can be focused on the output pinhole to form a conjugate imaging of point illumination-point detection. Such a design can not only reduce the attenuation of the incident light beam caused by environmental factors, and realize super-resolution imaging of distant targets in low-visibility weather, but also reduce the interference of background noise such as backscattered light and incident light beam on imaging, and improve imaging quality. In addition, using the collimation unit to expand the laser beam can not only improve the uniformity and consistency of the incident light beam, but also maximize the use of the focusing ability of the telescope, improve the focusing accuracy of the light beam and the resolution of imaging. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0027] Figure 1 A module schematic diagram of a confocal optical imaging device provided in an embodiment of the present application Figure 1 ;
[0028] Figure 2 A module schematic diagram of a confocal optical imaging device provided in an embodiment of the present application Figure 2 ;
[0029] Figure 3 A module schematic diagram of a confocal optical imaging device provided in an embodiment of the present application Figure 3 ;
[0030] Figure 4A schematic diagram of the optical path of a confocal optical imaging device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0034] In the description of this application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0035] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0036] It should be noted that, in the absence of conflict, different features in the embodiments of the present application may be combined with each other.
[0037] To solve the problems in the prior art, please refer to Figure 1An embodiment of the present application provides a confocal optical imaging device 10 , which includes a collimating unit 110 , a spectroscopic unit 120 , a deflection unit 130 and a telescope 140 .
[0038] The collimation unit 110 can convert the received laser beam into a parallel emission beam and expand the emission beam. The diameter of the emission beam after expansion is similar to the size of the eyepiece in the telescope 140. While improving the uniformity and consistency of the beam, the focusing ability of the telescope 140 can be maximized.
[0039] After the emission light beam is incident on the telescope 140 via the light splitting unit 120 and the deflection unit 130, the telescope 140 can adjust the focal point of the emission light beam by the distance of the focusing lens, focus the emission light beam on the target object, form a point illumination light source on the target object, and receive the echo light beam returned from the target object, that is, the same light spot returned from the target object. The magnification of the telescope 140 can be 2 to 35, preferably, the magnification of the telescope 140 can be 8 times, and the focal point of the emission light beam can be adjusted by adjusting the distance between the objective lens and the eyepiece in the telescope 140.
[0040] The light splitting unit 120 can separate the emission light beam and the echo light beam, so that the echo light beam is focused on the output pinhole after passing through the collimating unit 110, forming a point-to-point conjugate imaging, thereby avoiding interference of the emission light beam on the imaging and improving the signal-to-noise ratio of the imaging. The light splitting unit 120 includes but is not limited to optical elements such as a beam splitting cube, a perforated reflector or a centrally coated mirror.
[0041] The deflection unit 130 can control the deflection direction of the emission light beam so that the emission light beam is focused on different positions of the target object to scan the target object. The deflection unit 130 can be connected to other control devices to control the deflection unit 130 to change the focus of the emission light beam to scan the target object. The scanning range and accuracy can be determined according to the actual detection area size and accuracy. No specific restrictions are imposed on the specific scanning method and scanning path.
[0042] In the above structure, the laser beam is expanded by the collimating unit 110 to obtain a parallel incident beam, and the incident beam is focused on different positions of the target object through the cooperation of the deflection unit 130 and the telescope 140 to achieve point illumination of the target object, and at the same time, the echo beam returned from the target object is received, and the echo beam is separated by the spectroscopic unit 120, so that the echo beam can be focused on the output pinhole to form a conjugate imaging of point illumination-point detection. Such a design can not only reduce the attenuation of the incident beam caused by environmental factors, realize the detection imaging of distant targets, but also reduce the interference of backscattered light and background noise such as the incident beam on the imaging, and improve the imaging quality. In addition, using the collimating unit 110 to expand the laser beam can not only improve the uniformity and consistency of the beam, but also maximize the use of the focusing ability of the telescope 140, improve the focusing accuracy of the beam and the resolution of the imaging.
[0043] For some possible implementations, please refer to Figure 2 The collimating unit 110 may include a first collimating subunit 111 and a second collimating subunit 112. The first collimating subunit 111 is connected to the light splitting unit 120, and the first collimating subunit 111 may expand the received laser beam to obtain a parallel emission beam, and transmit the emission beam to the light splitting unit 120, and after the deflection direction thereof is adjusted by the deflection unit 130, the emission beam is incident on the telescope 140, and the telescope 140 focuses the emission beam on a certain point on the target object.
[0044] The second collimating subunit 112 is coupled to the output pinhole, and is used for receiving the echo light beam split from the light splitting unit 120, and coupling the echo light beam to the output pinhole to form a point-to-point conjugate imaging at the output pinhole.
[0045] The first collimating subunit 111 and the second collimating subunit 112 may include a collimator or a collimating light path composed of a plurality of lenses.
[0046] It should be noted that the second collimation subunit 112 can be coupled with an optical fiber and connected to other signal processing devices (e.g., imaging devices) through the optical fiber to further process the imaging results. The output pinhole can include an optical fiber end face, and the output aperture of the output pinhole is consistent with the Airy disk diameter. Exemplarily, the output aperture of the output pinhole is 1AU.
[0047] For further information, please refer to Figure 3The confocal optical imaging device 10 may further include a linear polarizer 150 and a half-wave plate 160 , wherein the linear polarizer 150 and the half-wave plate 160 are sequentially located between the first collimating subunit 111 and the light splitting unit 120 .
[0048] The linear polarizer 150 can convert the emission light beam emitted by the first collimating subunit 111 into an emission light beam in a linear polarization state, and the half-wave plate 160 can adjust the polarization direction of the emission light beam in the linear polarization state to vertical polarization, and transmit the vertically polarized emission light beam to the spectroscopic unit 120 .
[0049] In the above structure, by controlling the polarization state of the emission light beam through the linear polarizer 150 and the half-wave plate 160, stray light caused by atmospheric scattering or surface reflection of optical elements can be reduced, thereby improving the signal-to-noise ratio of imaging.
[0050] Further, please refer again to Figure 3 The confocal optical imaging device 10 also includes a first reflecting mirror group unit 171 and a second reflecting mirror group unit 172 .
[0051] The first reflector assembly unit 171 is located between the half-wave plate 160 and the light splitting unit 120, and the first reflector assembly unit 171 is used to adjust the transmission optical path of the emission light beam so that the emission light beam is transmitted to the light splitting unit 120. Exemplarily, the first reflector assembly unit 171 may include a first reflector, and the emission light beam emitted by the half-wave plate 160 is transmitted to the light splitting unit 120 via the first reflector.
[0052] The second reflector assembly unit 172 is located between the light splitting unit 120 and the second collimating subunit 112, and the second reflector assembly unit 172 is used to adjust the direction and position of the optical axis of the transmission optical path of the echo light beam, so that the echo light beam is transmitted to the second collimating subunit 112. Exemplarily, the second reflector assembly unit 172 may include a second reflector 1721 and a third reflector 1722, and the second reflector 1721 and the third reflector 1722 are arranged in sequence between the light splitting unit 120 and the second collimating subunit 112, and the echo light beam emitted by the light splitting unit 120 reaches the second collimating subunit 112 via the second reflector 1721 and the third reflector 1722 in sequence.
[0053] For some possible implementations, please refer again to Figure 3, the confocal optical imaging device 10 may further include a coupling unit 180. The coupling unit 180 may be located between the light splitting unit 120 and the second collimating subunit 112, and the coupling unit 180 may be used to focus the echo light beam emitted by the light splitting unit 120, and accurately transmit the focused echo light beam to the second collimating subunit 112. The coupling unit 180 includes a coupling lens, and the distance between the coupling lens and the output pinhole may be adjusted so that the echo light beam may be focused at the output pinhole to form a point-to-point conjugate image at the output pinhole.
[0054] In addition, please refer to Figure 3 and Figure 4 , Figure 4 Schematic diagram of a possible optical path of the confocal optical imaging device 10. The confocal optical imaging device 10 also includes a filtering unit 190, which is located between the coupling unit 180 and the second collimating subunit 112, and the filtering unit 190 is used to filter the echo light beam to improve the imaging quality. Exemplarily, the filtering unit 190 may include a narrowband filter, which allows light of a target wavelength (for example, light in the echo light beam that is the same as or close to the wavelength of the emission light beam) to pass through, and suppresses or reflects light of other wavelengths from entering the second collimating subunit 112, thereby improving the imaging quality.
[0055] In summary, the present application provides a confocal optical imaging device, which includes a collimating unit, a spectroscopic unit, a deflection unit and a telescope. In the above device, the incident light beam is focused on different positions of the target object through the coordination of the deflection unit and the telescope to achieve point illumination of the target object, and at the same time, the echo light beam returned from the target object is received, and the echo light beam is separated by the spectroscopic unit, so that the echo light beam can be focused on the output pinhole to form a conjugate imaging of point illumination-point detection. Such a design can not only reduce the attenuation of the incident light beam by environmental factors, and realize super-resolution imaging of distant targets in low-visibility weather, but also reduce the interference of background noise such as backscattered light and incident light beam on imaging, and improve the imaging quality. In addition, using the collimating unit to expand the laser light beam can not only improve the uniformity and consistency of the incident light beam, but also maximize the use of the focusing ability of the telescope, improve the focusing accuracy of the light beam and the resolution of the imaging.
[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A confocal optical imaging device, characterized in that: The confocal optical imaging device comprises a collimation unit, a light splitting unit, a deflection unit and a telescope; The collimating unit is used to expand the received laser beam to obtain a parallel emission beam, and the emission beam is incident on the telescope via the light splitting unit and the deflection unit; The telescope is used to adjust the focus point of the emission light beam, focus the emission light beam on the target object, and receive the echo light beam returned from the target object; The light splitting unit is used to split the emission light beam and the echo light beam, so that the emission light beam is focused on a certain point position of the target object, and the echo light beam is transmitted to the output pinhole after passing through the collimating unit to form a point-to-point conjugate imaging at the output pinhole; The deflection unit is used to control the deflection direction of the emission light beam so as to focus the emission light beam on different positions of the target object.
2. The confocal optical imaging device according to claim 1, characterized in that: The collimation unit comprises a first collimation subunit and a second collimation subunit; The first collimating subunit is connected to the light splitting unit, and the first collimating subunit is used to expand the received laser beam to obtain a parallel emission beam, and transmit the emission beam to the light splitting unit; The second collimating subunit is coupled to the output pinhole, and is used for receiving the echo light beam split from the light splitting unit, and coupling the echo light beam to the output pinhole.
3. The confocal optical imaging device according to claim 2, characterized in that: The output aperture of the output pinhole is consistent with the Airy disk diameter.
4. The confocal optical imaging device according to claim 2, characterized in that: The confocal optical imaging device further comprises a linear polarizer and a half-wave plate, wherein the linear polarizer and the half-wave plate are sequentially located between the first collimating subunit and the light splitting unit; The linear polarizer is used to convert the emission light beam emitted by the first collimating subunit into an emission light beam in a linear polarization state, and the half-wave plate is used to adjust the polarization direction of the emission light beam in the linear polarization state to vertical polarization, and transmit the vertically polarized emission light beam to the spectroscopic unit.
5. The confocal optical imaging device according to claim 4, characterized in that: The confocal optical imaging device further comprises a first reflector assembly unit and a second reflector assembly unit; The first reflector assembly unit is located between the half-wave plate and the beam splitter unit, and the first reflector assembly unit is used to adjust the transmission optical path of the emission light beam so that the emission light beam is transmitted to the beam splitter unit; The second reflector assembly unit is located between the light splitting unit and the second collimating sub-unit, and the second reflector assembly unit is used to adjust the transmission optical path of the echo light beam so that the echo light beam is transmitted to the second collimating sub-unit.
6. The confocal optical imaging device according to claim 5, characterized in that: The first reflector assembly unit at least includes a first reflector, and the emission light beam emitted by the half-wave plate is transmitted to the light splitting unit via the first reflector; The second reflector assembly unit includes at least a second reflector and a third reflector, and the second reflector and the third reflector are arranged in sequence between the spectroscopic unit and the second collimating subunit, and the echo light beam emitted by the spectroscopic unit reaches the second collimating subunit via the second reflector and the third reflector in sequence.
7. The confocal optical imaging device according to claim 2, characterized in that: The confocal optical imaging device further comprises a coupling unit; The coupling unit is located between the light splitting unit and the second collimating subunit, and is used for focusing the echo light beam emitted by the light splitting unit and transmitting the focused echo light beam to the second collimating subunit.
8. The confocal optical imaging device according to claim 7, characterized in that: The confocal optical imaging device further includes a filtering unit, which is located between the coupling unit and the second collimating subunit, and is used to filter the echo light beam.
9. The confocal optical imaging device according to claim 1, characterized in that: The light splitting unit includes a beam splitting cube, a perforated reflector, a perforated reflector or a central coated mirror.
10. The confocal optical imaging device according to claim 1, characterized in that: The magnification of the telescope is 2-35.