Spectral acquisition device and spectral imaging device

Abstract

The invention discloses a spectrum acquisition device and a spectrum imaging device, and the device comprises a first reflection part which at least comprises a first transmission surface and a first reflection surface, and enables a light beam to enter the first reflection part, to be transmitted by the first transmission surface, to be reflected by the first reflection surface, and to be transmitted by the first transmission surface, to be transmitted by the first reflection surface, and to be transmitted by the second transmission surface. The light enters the light splitting part in a convergent form; the light splitting part at least comprises a third transmission surface and a third reflection surface, the light beam is transmitted by the third transmission surface and then enters the third reflection surface, the third reflection surface is provided with a grating, the grating splits the light beam to generate split light beams with different spectrums, and the split light beams are transmitted by the third transmission surface and then enter the second reflection part; and the second reflection part at least comprises a second transmission surface and a second reflection surface, so that the split light beams incident to the second reflection part are sequentially transmitted by the second transmission surface, reflected by the second reflection surface and transmitted by the second transmission surface, and then are incident to the image surface in a convergent form. The invention is more beneficial to aberration correction.

Description

Technical Field

[0001] The present invention relates to the field of optical systems, and in particular to a spectrum acquisition device and a spectrum imaging device. Background Art

[0002] Hyperspectral imagers are optical instruments that can simultaneously collect both spatial and spectral information about a target. They are now widely used in fields such as atmospheric science, geology, astronomy, ecology, and oceanography. The demand for lightweight, compact, and high-performance hyperspectral imagers is increasingly urgent, especially in applications such as space remote sensing, aerial remote sensing, and portable measurement.

[0003] The hyperspectral imager includes a telescope and a spectrometer. The telescope images the observed target on the image plane of the telescope. The slit on the image plane serves as a field stop to limit the target imaging area. The spectrometer splits the telescope image and performs secondary imaging to obtain the spatial and spectral information of the target.

[0004] The Offner grating spectrometer is a classic spectrometer configuration, consisting of a concave spherical reflector and a convex spherical grating. Its concentric optical structure provides excellent image quality, and its use of only two reflective optical elements eliminates chromatic aberration and maintains a compact envelope. The Offner-Chrisp grating spectrometer is an improved version of the Offner configuration, splitting the original concave spherical reflector into two independent spherical reflectors. This provides more optical degrees of freedom and offers advantages over the Offner configuration in terms of optical aberration correction. However, the traditional Offner and Offner-Chrisp configurations utilize convex spherical gratings and spherical reflectors, resulting in fewer degrees of freedom for optical system optimization and lower aberration correction capabilities. Summary of the Invention

[0005] The purpose of the present invention is to provide a spectrum acquisition device and a spectrum imaging device, which are more conducive to the correction of aberrations.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A spectrum acquisition device, comprising:

[0008] a first reflecting portion comprising at least a first transmitting surface and a first reflecting surface, so that the light beam incident on the spectrum acquisition device is incident on the first reflecting portion, the light beam is sequentially transmitted through the first transmitting surface, reflected through the first reflecting surface, and transmitted through the first transmitting surface again, and then is incident on the spectroscopic portion in a converging manner;

[0009] The light splitting portion includes at least a third transmission surface and a third reflection surface, so that the light beam incident on the light splitting portion is transmitted through the third transmission surface and then incident on the third reflection surface, the third reflection surface is provided with a grating, and the grating is used to split the light beam incident on the third reflection surface to generate split light beams with different spectra, and the generated split light beams are transmitted through the third transmission surface and then incident on the second reflection portion;

[0010] The second reflecting portion includes at least a second transmitting surface and a second reflecting surface, so that the split light beam incident on the second reflecting portion is sequentially transmitted through the second transmitting surface, reflected through the second reflecting surface, and transmitted through the second transmitting surface again, and then incident on the image plane in a converging form.

[0011] Optionally, the first transmission surface is a spherical surface or an aspherical surface, and the first reflection surface is a spherical surface or an aspherical surface;

[0012] Or / and, the second transmission surface is a spherical surface or an aspherical surface, and the second reflection surface is a spherical surface or an aspherical surface.

[0013] Optionally, the third transmission surface is a spherical surface or an aspherical surface;

[0014] Or / and, the third reflecting surface is a spherical surface.

[0015] Optionally, the first reflecting portion and the second reflecting portion are integrally provided, the first transmitting surface and the second transmitting surface are on the same plane, and the first reflecting surface and the second reflecting surface are on the same plane.

[0016] A spectral imaging device, comprising:

[0017] a lens, used to capture light from the target;

[0018] In the spectrum acquisition device described in any one of the above embodiments, light from the target passes through the lens and then enters the spectrum acquisition device.

[0019] Optionally, it also includes:

[0020] an aperture, provided on the light incident side of the first reflecting portion of the spectrum acquisition device, for allowing the light beam incident on the spectrum acquisition device to pass through the aperture and then be incident on the first reflecting portion;

[0021] a detection unit, provided on the image plane of the spectrum acquisition device, for detecting the light intensity of the received split light beam;

[0022] The frame is provided with a cavity, the spectrometer, the first reflecting part and the second reflecting part are all arranged in the cavity, a first light opening and a second light opening are provided at one end of the frame, the aperture is provided on the frame and corresponds to the first light opening, the detection part is provided on the frame and corresponds to the second light opening, so that the light beam passing through the aperture enters the cavity, is incident on the first reflecting part, is reflected by the first reflecting part and then is incident on the spectrometer, the spectroscopic light beam generated by the spectrometer is incident on the second reflecting part, is reflected by the second reflecting part and then passes through the second light opening and is incident on the detection part.

[0023] Optionally, it also includes:

[0024] The mounting seat is provided with a light-transmitting cavity, a first mounting cavity, and a second mounting cavity. The light-transmitting cavity is communicated with the first mounting cavity, the second mounting cavity is provided in the light-transmitting cavity, the second mounting cavity is used for mounting the light-splitting part, and the first mounting cavity is used for mounting the first reflecting part and the second reflecting part;

[0025] A through opening is provided at the other end of the frame, and the through opening is used to allow the mounting seat on which the light splitting unit, the first reflecting unit, and the second reflecting unit are mounted to be installed into the cavity.

[0026] Optionally, it also includes:

[0027] A first circuit board, a filter element, a filter holder and a frame holder, the detection part is arranged on the first circuit board, the filter element is installed on the filter holder, and the filter holder is installed on the first circuit board so that the filter element is on the side of the detection part that receives light, the first circuit board is installed on the frame holder, and the frame holder is connected to one end of the frame body so that the detection part and the second light port are arranged correspondingly.

[0028] Optionally, it also includes:

[0029] A first circuit board, a frame seat, and a gasket, wherein the detection portion is provided on the first circuit board, the first circuit board is mounted on the frame seat, and the frame seat is connected to one end of the frame body so that the detection portion and the second light opening are provided correspondingly;

[0030] The pad is used to be arranged between the frame seat and the end of the frame body. The pad includes pads of multiple different thicknesses, so that the position of the detection part can be changed by replacing the pads of different thicknesses, so that the detection part and the image plane correspond to each other.

[0031] Optionally, it also includes:

[0032] a second circuit board, disposed at an end of the spectrum acquisition device away from the lens;

[0033] The bottom shell is arranged at one end of the spectrum acquisition device away from the lens. The bottom shell is provided with a heat dissipation fin. The inner end surface of the heat dissipation fin forms a heat dissipation boss. The heat dissipation boss and the high-heat component of the second circuit board are bonded together through a heat-conducting medium.

[0034] As can be seen from the above technical solution, the present invention provides a spectrum acquisition device, including: a first reflecting portion, including at least a first transmission surface and a first reflection surface, so that a light beam incident on the spectrum acquisition device is incident on the first reflection portion, the light beam is sequentially transmitted through the first transmission surface, reflected through the first reflection surface, and then transmitted through the first transmission surface, and then is incident on the spectroscopic portion in a converging manner; a spectroscopic portion, including at least a third transmission surface and a third reflection surface, so that the light beam incident on the spectroscopic portion is transmitted through the third transmission surface and then is incident on the third reflection surface, the third reflection surface being provided with a grating, the grating being used to split the light beam incident on the third reflection surface to generate spectroscopic light beams with different spectra, the generated spectroscopic light beams being transmitted through the third transmission surface and then are incident on the second reflecting portion; a second reflecting portion, including at least a second transmission surface and a second reflection surface, so that the spectroscopic light beam incident on the second reflection portion is sequentially transmitted through the second transmission surface, reflected through the second reflection surface, and then transmitted through the second transmission surface, and then is incident on the image plane in a converging manner.

[0035] In the spectrum acquisition device of the present invention, the incident light beam passes through the first reflecting part and then enters the spectroscopic part. The light beam passes through the first transmission surface and the first reflection surface in the first reflecting part. The light beam also passes through the third transmission surface before entering the grating of the spectroscopic part. When the split light beam generated by the grating is incident on the image plane, it passes through the third transmission surface and the second transmission surface and the second reflection surface of the second reflecting part. The first transmission surface and the first reflection surface of the first reflecting part, the third transmission surface of the spectroscopic part, and the second transmission surface and the second reflection surface of the second reflecting part can all be used to correct aberrations. Therefore, the spectrum acquisition device of the present invention is more conducive to correcting aberrations.

[0036] The spectral imaging device of the present invention realizes spectral imaging, which is more conducive to the correction of aberrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of a spectrum acquisition device provided by one embodiment of the present invention;

[0039] Figure 2 This is the MTF-field curve at 400nm of the spectrum acquisition device according to one embodiment of the present invention;

[0040] Figure 3 This is the MTF-field curve at 600nm of the spectrum acquisition device according to one embodiment of the present invention;

[0041] Figure 4 This is the MTF-field curve of the spectrum acquisition device at 800nm ​​according to one embodiment of the present invention;

[0042] Figure 5 This is the MTF-field curve at 1000nm of the spectrum acquisition device according to one embodiment of the present invention;

[0043] Figure 6 A schematic diagram of a spectral imaging device provided by one embodiment of the present invention;

[0044] Figure 7 A structural diagram showing the connection between a middle shell module and a lens of a spectral imaging device provided by one embodiment of the present invention;

[0045] Figure 8 A cross-sectional view of a middle shell module and a lens of a spectral imaging device provided by one embodiment of the present invention;

[0046] Figure 9 A cross-sectional view of a spectral imaging device provided by one embodiment of the present invention, in which a light-splitting portion, a first reflecting portion, and a second reflecting portion are installed on a mounting base;

[0047] Figure 10 An overall structural diagram of a spectral imaging device provided by one embodiment of the present invention;

[0048] Figure 11 A schematic exploded view of the structure of a spectral imaging device provided by one embodiment of the present invention.

[0049] The reference numerals in the drawings of the specification include:

[0050] 10- aperture, 11- first reflecting portion, 110- first transmitting surface, 111- first reflecting surface, 12- second reflecting portion, 120- second transmitting surface, 121- second reflecting surface, 13- spectrometer, 130- third transmitting surface, 131- third transmitting surface, 14- image plane, 15- filter element, 16- reflecting portion;

[0051] 1-front shell module, 101-lens, 102-camera module, 103-front shell;

[0052] 2-middle shell module, 201-detection part, 202-frame, 203-second circuit board, 204-mounting seat, 205-pressure cover, 206-cover plate, 207-first circuit board, 208-filter holder, 209-frame seat, 210-gasket, 211-middle shell, 212-adapter seat, 213-gasket;

[0053] 3- bottom shell module, 301- power supply module, 302- signal control module, 303- data transmission and storage module, 304- external interface, 305- bottom shell. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0055] This embodiment provides a spectrum acquisition device, including:

[0056] a first reflecting portion comprising at least a first transmitting surface and a first reflecting surface, so that the light beam incident on the spectrum acquisition device is incident on the first reflecting portion, the light beam is sequentially transmitted through the first transmitting surface, reflected through the first reflecting surface, and transmitted through the first transmitting surface again, and then is incident on the spectroscopic portion in a converging manner;

[0057] The light splitting portion includes at least a third transmission surface and a third reflection surface, so that the light beam incident on the light splitting portion is transmitted through the third transmission surface and then incident on the third reflection surface, the third reflection surface is provided with a grating, and the grating is used to split the light beam incident on the third reflection surface to generate split light beams with different spectra, and the generated split light beams are transmitted through the third transmission surface and then incident on the second reflection portion;

[0058] The second reflecting portion includes at least a second transmitting surface and a second reflecting surface, so that the split light beam incident on the second reflecting portion is sequentially transmitted through the second transmitting surface, reflected through the second reflecting surface, and transmitted through the second transmitting surface again, and then incident on the image plane in a converging form.

[0059] The light beam incident on the spectrum acquisition device is incident on the first reflective portion. The light beam is sequentially transmitted through the first transmission surface of the first reflective portion, reflected by the first reflection surface, and then transmitted through the first transmission surface again, before being incident on the spectroscopic portion in a converging manner. The light beam incident on the spectroscopic portion is transmitted through the third transmission surface of the spectroscopic portion and then incident on the third reflection surface. The grating provided on the third reflection surface splits the light beam, generating spectroscopic beams with different spectra. The generated spectroscopic beams are then transmitted through the third transmission surface and incident on the second reflective portion. The spectroscopic beams incident on the second reflective portion are sequentially transmitted through the second transmission surface, reflected by the second reflection surface, and then transmitted through the second transmission surface again, before being incident on the image plane in a converging manner.

[0060] In the spectrum acquisition device of this embodiment, the incident light beam passes through the first reflecting part and then enters the spectroscopic part. The light beam passes through the first transmission surface and the first reflection surface in the first reflecting part. The light beam also passes through the third transmission surface before entering the grating of the spectroscopic part. When the split light beam generated by the grating is incident on the image plane, it passes through the third transmission surface and the second transmission surface and the second reflection surface of the second reflecting part. The first transmission surface and the first reflection surface of the first reflecting part, the third transmission surface of the spectroscopic part, and the second transmission surface and the second reflection surface of the second reflecting part can all be used to correct aberrations. Therefore, the spectrum acquisition device of this embodiment is more conducive to correcting aberrations.

[0061] In some embodiments, the first transmission surface of the first reflective portion is spherical or aspherical, and the first reflective surface is spherical or aspherical. A spherical first transmission surface and / or a spherical first reflective surface facilitate manufacturing. An aspherical first transmission surface can increase the degree of freedom for optical optimization, enhancing the aberration correction capability of the first transmission surface. An aspherical first reflective surface can increase the degree of freedom for optical optimization, enhancing the aberration correction capability of the first reflective surface, and thereby improving the imaging quality of the spectrum acquisition device.

[0062] In this embodiment, the spectrometer includes a third transmissive surface and a third reflective surface. A light beam incident on the spectrometer is transmitted through the third transmissive surface before entering the third reflective surface. A grating is provided on the third reflective surface, and the split light beam generated by the grating is transmitted through the third transmissive surface before exiting. This provides more optimization variables and enhances aberration correction capabilities. In some embodiments, the third transmissive surface of the spectrometer is spherical or aspherical. An aspherical third transmissive surface can enhance aberration correction capabilities. In some embodiments, the third reflective surface of the spectrometer is spherical. Since a grating is required on the third reflective surface, a spherical surface can reduce the difficulty of grating manufacturing.

[0063] In some embodiments, the second transmissive surface of the second reflective portion is spherical or aspherical, and the second reflective surface is spherical or aspherical. A spherical second transmissive surface and / or a spherical second reflective surface facilitate manufacturing. An aspherical second transmissive surface can increase the degree of freedom for optical optimization, enhancing the aberration correction capability of the second transmissive surface. An aspherical second reflective surface can increase the degree of freedom for optical optimization, enhancing the aberration correction capability of the second reflective surface, and thereby improving the imaging quality of the spectrum acquisition device.

[0064] In some embodiments, the first reflective portion includes a first side surface proximal to the beam splitter and a second side surface distal to the beam splitter, wherein the first side surface is a first transmissive surface and the second side surface forms a first reflective surface. The first side surface is a concave surface and the second side surface is a convex surface, such that the first reflective portion causes the light beam incident on the first reflective portion to be incident on the beam splitter in a converging manner. The first reflective portion can be considered an internal reflector. In some embodiments, a reflective film can be provided on the second side surface of the first reflective portion to form the first reflective surface.

[0065] In some embodiments, the second reflective portion includes a third side surface proximal to the beam splitter and a fourth side surface distal to the beam splitter. The third side surface is the second transmission surface, and the fourth side surface forms the second reflection surface. The third side surface is concave, and the fourth side surface is convex, so that the second reflective portion can converge the split light beam incident on the second reflective portion onto the image plane. The second reflective portion can be considered an internal reflector. In some embodiments, a reflective film can be provided on the fourth side surface of the second reflective portion to form a second reflection surface.

[0066] In some embodiments, the first and second reflecting portions are disposed on the same side of the beam splitter. The beam splitter includes a fifth side surface proximal to the first and second reflecting portions and a sixth side surface distal to the first and second reflecting portions. The fifth side surface is the third transmission surface, and the sixth side surface is the third reflection surface. The fifth side surface is convex, and the sixth side surface is concave. The beam splitter can be considered an internal reflection grating.

[0067] For example, you can refer to Figure 1 , Figure 1A schematic diagram of a spectrum acquisition device provided in accordance with an embodiment is shown. As shown in the figure, the spectrum acquisition device includes a first reflecting portion 11, a spectrometer 13, and a second reflecting portion 12. An incident light beam is transmitted to the first reflecting portion 11, refracted by the first transmission surface 110, reflected by the first reflecting surface 111, and then transmitted to the spectrometer 13 after being refracted by the first transmission surface 110. In the spectrometer 13, the spectrometer 13 is refracted by the third transmission surface 131, dispersed by the grating, and refracted by the third transmission surface 131. The spectrometer then transmits the spectrometer to the second reflecting portion 12, refracted by the second transmission surface 120, reflected by the second reflecting surface 121, and refracted by the second transmission surface 120 before being transmitted to the imaging surface 14. On the imaging surface 14, spectrometer beams of different wavelengths are imaged at different locations on the imaging surface 14, achieving spectral imaging.

[0068] The incident light beam passes through the first reflecting portion 11, which causes the light beam to be incident on the spectroscopic portion 13 in a converging manner. The incident light beam is a diverging light beam, and the first reflecting portion 11 serves to focus the light beam. The spectroscopic light beam generated by the grating passes through the second reflecting portion 12, which causes the spectroscopic light beam to be incident on the image plane 14 in a converging manner, so that the spectroscopic light beam is converged into an image. The image plane 14 can be set at the focal plane of the second reflecting portion 12. The first transmission surface 110 and the first reflection surface 111 of the first reflecting portion 11 and the second transmission surface 120 and the second reflection surface 121 of the second reflecting portion 12 also function to correct imaging aberrations such as spherical aberration, coma, astigmatism, field curvature, and distortion.

[0069] In some embodiments, the first reflective portion 11 and the second reflective portion 12 are integrally provided, which can make the spectrum acquisition device compact and facilitate the arrangement of the first reflective portion 11 and the second reflective portion 12. In some embodiments, the first transmission surface 110 and the second transmission surface 120 are on the same plane, and the first reflection surface 111 and the second reflection surface 121 are on the same plane. For example, reference can be made to Figure 1 As shown, the first reflecting portion 11 and the second reflecting portion 12 are integrally provided, the first transmitting surface 110 and the second transmitting surface 120 are on the same plane, and the first reflecting surface 111 and the second reflecting surface 121 are on the same plane.

[0070] In some embodiments, the distance between the third transmissive surface 131 of the spectrometer 13 and the pupil is less than a preset value, positioning the third transmissive surface 131 near the pupil. This allows the third transmissive surface 131 to contribute to aberrations in all fields of view almost throughout its entire aperture, resulting in a strong aberration correction capability. The device can simultaneously correct low- and high-order spherical aberrations, coma, astigmatism, and other aberrations, significantly improving the imaging performance of the spectral imaging device. The pupil refers to the image of the aperture stop, which limits the aperture of the lens imaging lens.

[0071] In some embodiments, the spectrum acquisition device further includes an aperture 10 disposed on the light-entering side of the first reflective portion 11, configured to allow a light beam incident on the spectrum acquisition device to pass through the aperture 10 before entering the first reflective portion 11. Aperture 10 is a field of view aperture of the spectrum acquisition device, and is used to limit the image field of the front lens. Aperture 10 can be disposed on the image plane of the lens to define the imaging area and thus restrict the image field of the lens. Aperture 10 can be a slit.

[0072] In some embodiments, the spectrum acquisition device further includes a filter element 15 disposed on the light-incident side of the image plane 14 for intercepting light of spectral orders other than the desired order in the split beam. Filter element 15 can be considered a secondary spectral filter capable of intercepting diffracted stray light of spectral orders other than the desired order.

[0073] In some embodiments, the spectrum acquisition device further includes a detection unit disposed on the imaging plane 14. The materials of the first reflective unit 11, the second reflective unit 12, the spectroscopic unit 13, and the type of the detection unit can be determined based on the imaging spectrum and chromatic aberration correction requirements, and can meet the requirements of hyperspectral imaging in the ultraviolet, visible, and infrared bands. The detection unit can be a detector.

[0074] The spectrum acquisition device is described in detail below using a specific example. Figure 1 The structure shown in Table 1 is used for the indexes of the spectrum acquisition device.

[0075] Table 1

[0076]

[0077] The relationship between MTF@100lp / mm and field of view of different spectral bands of the spectrum acquisition device is as follows: Figures 2 to 5 As shown. Among them, Figures 2 to 5 The following are the MTF-field curves for 400nm, 600nm, 800nm, and 1000nm, respectively. The horizontal axis represents the spatial frequency in 100lp / mm, and the vertical axis represents the OTF modulus.

[0078] The overall design performance of the spectrum acquisition device is shown in Table 2.

[0079] Table 2

[0080]

[0081] The above optical design examples show that the spectrum acquisition device is practical and effective.

[0082] The spectrum acquisition device of this embodiment takes into account both the difficulty of manufacturing a grating and the aberration correction capability of a high spectrum. Specifically, the spherical grating in the traditional Offner and Offner-Chrisp structures is replaced by an internal reflection grating, and the reflector is replaced by an internal reflector. The device has more optical variables and is more conducive to aberration correction. It can achieve a smaller envelope size design under the same performance indicators, or achieve better performance under the same envelope size, such as a higher MTF, a larger relative aperture, and a larger field of view.

[0083] The spectral acquisition device of this embodiment can be used in the ultraviolet, visible, and infrared bands. Its compact structure and excellent performance make it suitable for applications such as space remote sensing, aerial remote sensing, and portable measurement. The internal reflection grating spectrometer employed in this embodiment offers more optimization variables and stronger aberration correction capabilities compared to the spherical reflection gratings used in traditional spectrometers. Furthermore, by optimizing the grating material, it can also correct for smile and keystone distortions. When the refractive surface is aspherical, it offers strong aberration correction capabilities for low-F-number spectral systems, making it ideally suited for spectral imaging requirements under high signal-to-noise ratio conditions. It also boasts a compact design similar to that of an Offner spectrometer.

[0084] This embodiment further provides a spectral imaging device, including:

[0085] a lens, used to capture light from the target;

[0086] In the spectrum acquisition device described in any one of the above embodiments, light from the target passes through the lens and then enters the spectrum acquisition device.

[0087] In the spectrum acquisition device used in the spectral imaging device of this embodiment, the incident light beam passes through the first reflecting part and then enters the spectroscopic part. The light beam will pass through the first transmission surface and the first reflection surface in the first reflecting part. The light beam will also pass through the third transmission surface before entering the grating of the spectroscopic part. When the split light beam generated by the grating is incident on the image plane, it will pass through the third transmission surface and the second transmission surface and the second reflection surface of the second reflecting part. The first transmission surface and the first reflection surface of the first reflecting part, the third transmission surface of the spectroscopic part, and the second transmission surface and the second reflection surface of the second reflecting part can all be used to correct aberrations. Therefore, this spectral imaging device is more conducive to correcting aberrations.

[0088] In some embodiments, the spectral imaging device may further include an aperture 10 disposed on the light-entering side of the first reflective portion 11 of the spectral acquisition device, configured to direct a light beam incident on the spectral acquisition device through the aperture 10 before entering the first reflective portion 11. Aperture 10 is a field of view aperture of the spectral acquisition device, and is used to limit the image field of the front lens. Aperture 10 can be disposed on the image plane of the lens to define the imaging area and thus restrict the image field of the lens. Aperture 10 may be a slit.

[0089] In some embodiments, the spectral imaging device may further include: a detection unit, which is provided on the image plane 14 of the spectrum acquisition device and is used to detect the light intensity of the received split light beam. Figure 6 , Figure 6 A schematic diagram of a spectral imaging device is provided in one embodiment. As shown in the figure, the first reflecting portion 11 and the second reflecting portion 12 are integrally arranged to form the reflecting portion 16. The light from the lens 101 passes through the aperture 10, the reflecting portion 16, the spectroscopic portion 13, and the reflecting portion 16 in sequence and is transmitted to the detection portion 201.

[0090] In some embodiments, the aperture 10, the first reflecting portion 11, the light splitting portion 13, and the second reflecting portion 12 are integrally assembled. The integral assembly of the aperture 10, the first reflecting portion 11, the light splitting portion 13, and the second reflecting portion 12 means that the aperture 10, the first reflecting portion 11, the light splitting portion 13, and the second reflecting portion 12 are assembled together and can move as a whole, which helps to improve the stability of the spectral imaging device. Figure 6 As shown, the aperture 10 , the first reflecting portion 11 , the light splitting portion 13 and the second reflecting portion 12 are integrally assembled and are all disposed in the frame 202 .

[0091] In some embodiments, the spectral imaging device further includes: an aperture 10, which is arranged on the light incident side of the first reflecting portion 11 of the spectrum acquisition device, and is used to allow the light beam incident on the spectrum acquisition device to pass through the aperture 10 and then be incident on the first reflecting portion 11; a detection portion 201, which is arranged on the image plane 14 of the spectrum acquisition device, and is used to detect the light intensity of the received split light beam; a frame 202, which is provided with a cavity, and the splitting portion 13, the first reflecting portion 11 and the second reflecting portion 12 are all arranged in the cavity, and a first detector 201 is provided at one end of the frame 202. A light opening and a second light opening, the aperture 10 is arranged on the frame 202 and is corresponding to the first light opening, the detection part 201 is arranged on the frame 202 and is corresponding to the second light opening, so that the light beam passing through the aperture 10 enters the cavity, is incident on the first reflecting part 11, is reflected by the first reflecting part 11 and is incident on the spectroscopic part 13, the spectroscopic light beam generated by the spectroscopic part 13 is incident on the second reflecting part 12, is reflected by the second reflecting part 12 and passes through the second light opening and is incident on the detection part 201. In this way, the aperture 10, the first reflecting part 11, the spectroscopic part 13, the second reflecting part 12 and the detection part 201 are assembled as a whole and are all integrated on the frame 202. For example, you can refer to Figure 7 , Figure 7 This is a structural diagram of the connection between the middle shell module and the lens of a spectral imaging device provided by one embodiment. Figure 8 This is a cross-sectional view of a middle housing module and a lens of a spectral imaging device provided in one embodiment. As shown in the figure, the light splitting part 13 , the first reflecting part 11 and the second reflecting part 12 are all disposed in the cavity of the frame 202 .

[0092] In some embodiments, the spectral imaging device further comprises: a mounting base, provided with a light-transmitting cavity, a first mounting cavity, and a second mounting cavity, wherein the light-transmitting cavity is in communication with the first mounting cavity, the second mounting cavity is disposed within the light-transmitting cavity, the second mounting cavity is used to mount the light-splitting unit 13, and the first mounting cavity is used to mount the first reflecting unit 11 and the second reflecting unit 12. This allows the light-splitting unit 13, the first reflecting unit 11, and the second reflecting unit 12 to be assembled independently, and can be considered to form an independent light-splitting assembly, which facilitates assembly and debugging. Furthermore, during the production process, light-splitting assemblies can be mass-produced and assembled into independent components, which can be independently produced, assembled, debugged, kept, and stored. The modular design improves production efficiency and reduces production costs.

[0093] In some embodiments, a through opening is provided at the other end of the frame 202, and the through opening is used to allow the mounting base on which the spectrometer 13, the first reflecting part 11 and the second reflecting part 12 are installed to be installed into the cavity. The mounting base on which the spectrometer 13, the first reflecting part 11 and the second reflecting part 12 are installed can be integrally installed into the cavity of the frame 202 from the through opening at the other end of the frame 202, thereby achieving the installation of the spectrometer 13, the first reflecting part 11 and the second reflecting part 12 in the frame 202, which is convenient for assembly and debugging. In some embodiments, a pressure cover 205 may also be included for fixed connection with the through opening of the frame 202. After the mounting base on which the spectrometer 13, the first reflecting part 11 and the second reflecting part 12 are installed is installed into the cavity of the frame 202, it can be locked and fixed by the pressure cover 205. For example, reference may be made to Figure 8 and Figure 9 , Figure 9 A cross-sectional view of a spectral imaging device provided in one embodiment, in which the spectrometer, the first reflecting part, and the second reflecting part are installed on a mounting base, is shown in the figure. As shown in the figure, in the mounting base 204, the light-through cavity and the first mounting cavity are connected, the second mounting cavity is arranged in the light-through cavity, the spectrometer 13 is installed in the second mounting cavity, and the first reflecting part 11 and the second reflecting part 12 are installed in the first mounting cavity. After the spectrometer 13, the first reflecting part 11 and the second reflecting part 12 are installed in the mounting base, they can be fixed by bonding. After the spectrometer component is installed in the cavity of the frame 202, it is locked and fixed by the pressure cover 205. The spectrometer 13, the first reflecting part 11 and the second reflecting part 12 can be fixed in the mounting base 204 by bonding with glue.

[0094] In some embodiments, a cavity is provided at one end of the frame 202 and a first light opening is provided at the bottom of the cavity, and the cavity is used to install the diaphragm 10. The position of the diaphragm 10 can be limited by the cavity, which is convenient for installation. The diaphragm 10 can be bonded into the cavity and fixed. In some embodiments, a cover plate 206 is provided on one side of the diaphragm 10. On the one hand, the cover plate 206 can protect the surface of the diaphragm 10 to avoid accidental bumps or damage to the diaphragm 10 when assembling other components. On the other hand, the aperture of the light opening provided in the cover plate 206 is slightly larger than the aperture of the diaphragm 10. The light opening of the cover plate 206 can filter out excess stray light and edge light. For example, you can refer to Figure 8 As shown, the diaphragm 10 is disposed in a concave cavity on the frame 202 , and a cover plate 206 is disposed on the front side of the diaphragm 10 .

[0095] In some embodiments, the spectral imaging device may further include a first circuit board 207 and a frame seat 209, the detection unit 201 is arranged on the first circuit board 207, the first circuit board 207 is installed on the frame seat 209, and the frame seat 209 is connected to one end of the frame body 202, so that the detection unit 201 is arranged corresponding to the second light-transmitting port of the frame body 202, thereby integrating the detection unit 201 into the frame body 202.

[0096] In some embodiments, the spectral imaging device may further include: a filter element 15, which is arranged on the side of the detection part 201 receiving light, and is used to intercept light of other spectral levels in the split light beam except the required spectral level. In some embodiments, the spectral imaging device may further include a filter element 15 and a filter holder, wherein the filter element 15 is mounted on the filter holder, and the filter holder is mounted on the first circuit board 207, so that the filter element 15 is on the side of the detection part 201 receiving light, and the first circuit board 207 is mounted on the frame seat 209, and the frame seat 209 is connected to one end of the frame body 202, so that the detection part 201 and the second light port are correspondingly arranged. Please refer to Figure 8 As shown, the detector unit 201 is packaged and integrated on a first circuit board 207. The filter element 15 is mounted in a recess within a filter holder 208 by adhesive bonding. The filter holder 208, with the filter element 15 integrated, is mounted at a designated position on the first circuit board 207. The circuit board 207, after mounting the filter assembly (i.e., the filter holder 208 with the filter element 15 integrated), is mounted within a frame 209. The resulting assembly forms a complete imaging assembly. In some embodiments, the filter holder 208, with the filter element 15 integrated, can be mounted at a designated position on the first circuit board 207 using screws. A certain amount of assembly margin can be reserved in the mounting holes between the first circuit board 207 and the filter holder 208. This allows for fine-tuning of the filter element 15's position during assembly based on the actual beam position, minimizing the impact of manufacturing and gross errors.

[0097] In some embodiments, the spectral imaging device may further include a first circuit board 207, a frame 209, and a gasket 210. The detection unit 201 is disposed on the first circuit board 207, which is mounted on the frame 209. The frame 209 is connected to one end of the frame 202, so that the detection unit 201 is disposed corresponding to the second light opening. The gasket 210 is used to be disposed between the frame 209 and the end of the frame 202. The gasket 210 includes gaskets 210 of multiple different thicknesses. By replacing gaskets 210 of different thicknesses, the position of the detection unit 201 can be changed, so that the detection unit 201 corresponds to the image plane 14. The image plane 14 refers to the image plane of the optical assembly composed of the first reflecting unit 11, the spectroscopic unit 13, and the second reflecting unit 12. Due to errors in the machining of structural components, the image plane of the optical assembly may have slight deviations from the theoretical design value. Therefore, during assembly and adjustment, the height of the detector unit 201 needs to be fine-tuned based on the actual image plane measurement to select the optimal position for obtaining the most ideal spectral image. In this device, a pad 210 is added between the frame seat 209 and the frame body 202. The pad 210 is designed to have multiple sets of pads of different thicknesses. During the assembly and adjustment process, the pad 210 of the optimal thickness is selected based on the actual image plane position to ensure that the detector unit 201 is in the optimal position relative to the image plane 14.

[0098] The spectrometer 13, the first reflector 11, the second reflector 12, and the detector 201 are arranged in the frame 202 to form a spectral module. The spectral module is the smallest module that can work independently. The modular setting can acquire, analyze, and process spectral data at the smallest unit, and has complete imaging functions. The modular design can optimize the assembly process and reduce the difficulty of assembling the system. The frame 202 realizes the packaging integration of optical elements, detection units, and circuit boards, etc., based on which complete spectral imaging can be achieved. The imaging performance of the entire spectral module will not be affected by other external assembly processes and devices, and can achieve long-term high stability and reliable operation, while ensuring compactness. There are no complex and special assembly process requirements, which reduces the difficulty of assembling the spectral acquisition device.

[0099] In some embodiments, an adapter 212 is further provided at one end of the frame 202. The adapter 212 and the first optical port of the frame 202 are correspondingly provided for mounting the lens 101. For example, the adapter 212 is made of stainless steel, has high structural strength, and has a firm and reliable internal thread, which can meet the requirements of multiple replacement and adjustment of the lens 101. The knob is not prone to generating debris and impurities, and will not fall onto the aperture 10, thereby avoiding affecting the imaging optical path. In some embodiments, a gasket 213 is provided between the adapter 212 and the lens 101 to prevent dust. The lens 101 passes through the front housing 103, and the gasket 213 can be in contact with the inner wall of the front housing 103 on all sides, thereby preventing external dust from entering through the assembly gap between the front housing 103 and the lens 101. The lens 101 can be a telephoto lens.

[0100] In some embodiments, the spectral imaging device further includes a central housing 211. The spectrometer 13, the first reflector 11, the second reflector 12, and the detector 201 are integrated into the frame 202 to form a spectral module, which is disposed within the central housing 211. The central housing 211 is the main support frame of the entire device.

[0101] In some embodiments, the spectral imaging device may further include a second circuit board 203 connected to the other end of the frame 202, which can be used to implement power conversion, interconnection of interfaces between various functional units, and computational processing of spectral data. In some embodiments, the second circuit board 203 and the frame 202 are connected by studs, and the two are installed using a thermal insulation design. The frame 202 and the second circuit board 203 are only in contact at the location where the studs are provided. This reduces the contact area between the two and reduces the heat conduction from the second circuit board 203 to the front frame 202. At the same time, a gasket can be provided between the stud and the hole of the second circuit board 203, and the stud is inserted into the hole of the second circuit board 203. The gasket is selected from a low thermal conductivity gasket and a material with a low thermal conductivity coefficient. This increases the thermal resistance of the interface between the two, further enhancing the thermal insulation effect, and reducing the heat generated by the operation of the second circuit board 203 from causing thermal deformation of the frame 202 and optical elements, thereby affecting the accuracy of spectral imaging.

[0102] In some embodiments, the spectral imaging device may further include a camera module 102 for acquiring a large field of view image of the outside world. The large field of view image is used to display on the platform and locate the position of the spectral imaging spectrum line in the large field of view image, which can be used for real-time imaging preview. The field of view of the camera module 102 and the lens 101 are matched to assist the user in determining the central field of view position of the spectral acquisition device through the large field of view image acquired by the camera module 102. This makes it easier to determine the spectral imaging field of view position during gray plate shooting, calibration shooting, and other processes, thereby avoiding useless, erroneous, or incomplete data acquisition. The camera module 102 may be, but is not limited to, an RGB module or an RGB high-definition camera. In some embodiments, the camera module 102 is disposed in the front housing 103.

[0103] In some embodiments, the spectral imaging device may further include a bottom housing 305, which is provided with an external interface corresponding to the connector on the second circuit board 203. In some embodiments, the spectral imaging device may further include: a second circuit board 203, disposed at the end of the spectral acquisition device away from the lens 101; and a bottom housing 305, disposed at the end of the spectral acquisition device away from the lens 101. The bottom housing 305 is provided with heat dissipation fins, the inner end surfaces of which form heat dissipation bosses. The heat dissipation bosses are bonded to the high-heat components of the second circuit board 203 via a thermally conductive medium. The heat dissipation fins on the bottom housing 305 increase the effective heat dissipation area of ​​the bottom housing 305. The inner end surfaces of the heat dissipation fins form heat dissipation bosses, which are tightly bonded to the high-power components of the second circuit board 203 via a heat dissipation material. This transfers heat generated by the operation of the second circuit board 203 to the bottom housing 305, ensuring effective and controllable operating temperatures of the components and circuit board, and meeting heat dissipation requirements for the components and the entire spectral imaging device.

[0104] In some embodiments, the spectral imaging device of this embodiment includes three parts: a front shell module 1, a middle shell module 2, and a bottom shell module 3. The functional areas of each module are reasonably divided. Figure 10 and Figure 11 As shown, Figure 10 This is a diagram showing the overall structure of a spectral imaging device provided in one embodiment. Figure 11 This is an exploded schematic diagram of the structure of a spectral imaging device according to one embodiment. An independent spectral acquisition device, the primary optical imaging component, is integrated within the middle housing module 2. It is fixedly mounted within the middle housing 211, which serves as the main support frame for the entire device. The front housing 103 and bottom housing 305 are integrated and fixed to the middle housing 211, protecting the spectral acquisition device and encapsulating the imaging components. The integration and encapsulation of the front housing 103 and bottom housing 305 prevents interference with the spectral imaging components and affects optical performance.

[0105] The spectral imaging device of this embodiment has a stronger aberration correction capability of the system through the combined design of the spectrometer, the first reflector and the second reflector. At the same time, the number of optical elements is small, the longitudinal transmission length of the optical path is reduced, and the length of the entire optical system is effectively compressed, thereby ensuring the volume of the entire imaging device to achieve a lightweight design. The spectrometer component and the spectral module are independently assembled and packaged to achieve spectral acquisition, analysis, processing and storage of the smallest complete spectral unit. The assembly of the optical module is separated from the packaging and protection integration of the spectral acquisition device housing. On the one hand, it can improve the production assembly process and realize the assembly of modular and batch spectral imaging systems. On the other hand, the housing structure of the device mainly performs the functions of support, fixation and protection. It does not install and integrate optical elements and components related to spectral acquisition. Therefore, it is not necessary to ensure high processing accuracy, which can reduce the processing cost of the housing. At the same time, the appearance structure size and external interface layout of the spectral imaging device can be changed and adjusted according to different application scenarios and needs to meet special customization needs and multi-scenario application needs.

[0106] The above is a detailed introduction to the spectral acquisition device and spectral imaging device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications may be made to the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A spectrum acquisition device, characterized in that: include: a first reflecting portion comprising at least a first transmitting surface and a first reflecting surface, so that the light beam incident on the spectrum acquisition device is incident on the first reflecting portion, the light beam is sequentially transmitted through the first transmitting surface, reflected through the first reflecting surface, and transmitted through the first transmitting surface again, and then is incident on the spectroscopic portion in a converging manner; The light splitting portion includes at least a third transmission surface and a third reflection surface, so that the light beam incident on the light splitting portion is transmitted through the third transmission surface and then incident on the third reflection surface, the third reflection surface is provided with a grating, and the grating is used to split the light beam incident on the third reflection surface to generate split light beams with different spectra, and the generated split light beams are transmitted through the third transmission surface and then incident on the second reflection portion; The second reflecting portion includes at least a second transmitting surface and a second reflecting surface, so that the split light beam incident on the second reflecting portion is sequentially transmitted through the second transmitting surface, reflected through the second reflecting surface, and transmitted through the second transmitting surface again before being incident on the image plane in a converging form.

2. The spectrum acquisition device according to claim 1, characterized in that: The first transmission surface is a spherical surface or an aspherical surface, and the first reflection surface is a spherical surface or an aspherical surface; Or / and, the second transmission surface is a spherical surface or an aspherical surface, and the second reflection surface is a spherical surface or an aspherical surface.

3. The spectrum acquisition device according to claim 1, characterized in that: The third transmission surface is a spherical surface or an aspherical surface; Or / and, the third reflecting surface is a spherical surface.

4. The spectrum acquisition device according to claim 1, characterized in that: The first reflecting portion and the second reflecting portion are integrally provided, the first transmitting surface and the second transmitting surface are on the same plane, and the first reflecting surface and the second reflecting surface are on the same plane.

5. A spectral imaging device, characterized in that: include: a lens, used to capture light from the target; The spectrum acquisition device according to any one of claims 1 to 4, wherein light from the target passes through the lens and then enters the spectrum acquisition device.

6. The spectral imaging device according to claim 5, characterized in that: Also includes: an aperture, provided on the light incident side of the first reflecting portion of the spectrum acquisition device, for allowing the light beam incident on the spectrum acquisition device to pass through the aperture and then be incident on the first reflecting portion; a detection unit, provided on the image plane of the spectrum acquisition device, for detecting the light intensity of the received split light beam; The frame is provided with a cavity, the spectroscopic part, the first reflecting part and the second reflecting part of the spectrum acquisition device are all arranged in the cavity, the first light opening and the second light opening are provided at one end of the frame, the aperture is provided on the frame and corresponds to the first light opening, the detection part is provided on the frame and corresponds to the second light opening, so that the light beam passing through the aperture enters the cavity, is incident on the first reflecting part, is reflected by the first reflecting part and then is incident on the spectroscopic part, the spectroscopic light beam generated by the spectroscopic part is incident on the second reflecting part, is reflected by the second reflecting part and then passes through the second light opening and is incident on the detection part.

7. The spectral imaging device according to claim 6, characterized in that: Also includes: The mounting seat is provided with a light-transmitting cavity, a first mounting cavity, and a second mounting cavity. The light-transmitting cavity is communicated with the first mounting cavity, the second mounting cavity is provided in the light-transmitting cavity, the second mounting cavity is used for mounting the light-splitting part, and the first mounting cavity is used for mounting the first reflecting part and the second reflecting part; A through opening is provided at the other end of the frame, and the through opening is used to allow the mounting seat on which the light splitting unit, the first reflecting unit, and the second reflecting unit are mounted to be installed into the cavity.

8. The spectral imaging device according to claim 6, characterized in that: Also includes: A first circuit board, a filter element, a filter holder and a frame holder, the detection part is arranged on the first circuit board, the filter element is installed on the filter holder, and the filter holder is installed on the first circuit board so that the filter element is on the side of the detection part that receives light, the first circuit board is installed on the frame holder, and the frame holder is connected to one end of the frame body so that the detection part and the second light port are arranged correspondingly.

9. The spectral imaging device according to claim 6, characterized in that: Also includes: A first circuit board, a frame seat, and a gasket, wherein the detection portion is provided on the first circuit board, the first circuit board is mounted on the frame seat, and the frame seat is connected to one end of the frame body so that the detection portion and the second light opening are provided correspondingly; The pad is used to be arranged between the frame seat and the end of the frame body. The pad includes pads of multiple different thicknesses, so that the position of the detection part can be changed by replacing the pads of different thicknesses, so that the detection part and the image plane correspond to each other.

10. The spectral imaging device according to claim 5, characterized in that: Also includes: a second circuit board, disposed at an end of the spectrum acquisition device away from the lens; The bottom shell is arranged at one end of the spectrum acquisition device away from the lens. The bottom shell is provided with a heat dissipation fin. The inner end surface of the heat dissipation fin forms a heat dissipation boss. The heat dissipation boss and the high-heat component of the second circuit board are bonded together through a heat-conducting medium.

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