Ultraviolet dual-channel common-path imaging spectrometer

Abstract

The ultraviolet double-channel common light path imaging spectrometer in the embodiment of the present application comprises: an incident slit (1), a crescent lens (2), a main reflector (3), a convex grating (4), a first channel folding mirror (5), a second channel folding mirror (6), a first channel detector (7) and a second channel detector (8). The ultraviolet double-channel common light path imaging spectrometer in the embodiment of the present application adjusts the grating line density of the convex grating (4) and the off-axis amount of the incident light beam, so that the exit light beams of the first channel folding mirror (5) and the second channel folding mirror (6) are imaged on the upper and lower ends of the incident light beam through the first channel detector (7) and the second channel detector (8), realizing the beam imaging of two channels by one spectrometer. Compared with the design of one channel and one spectrometer, the space, weight and cost are saved.

Description

Technical Field

[0001] This invention relates to the field of optical instrument technology, and in particular to an ultraviolet dual-channel common-path imaging spectrometer. Background Technology

[0002] Offner-structured spectrometers are widely used in space exploration, featuring high resolution, simple and compact structure, and lightweight design.

[0003] Typically, to detect beams with high spectral resolution across multiple channels, a separate spectrometer is needed for each channel. Too many instruments increase emission and manufacturing costs. Furthermore, individual spectrometers also suffer from drawbacks such as lower spectral resolution, lower signal-to-noise ratio due to a relatively large aperture, and lower spatial resolution due to a short slit. Summary of the Invention

[0004] In view of this, it is necessary to address the shortcomings of existing technologies in terms of low spatial resolution and to provide an ultraviolet dual-channel common-path imaging spectrometer with advantages such as ultra-high spectral resolution, small F number, and long slit.

[0005] An ultraviolet dual-channel common-path imaging spectrometer according to an embodiment of the present invention includes: an entrance slit (1), a meniscus lens (2), a primary mirror (3), a convex grating (4), a first-channel folding mirror (5), a second-channel folding mirror (6), a first-channel detector (7), and a second-channel detector (8), wherein:

[0006] An incident light beam emitted from a telecentric forward telescope system enters the meniscus lens (2) through the entrance slit (1). The meniscus lens (2) refracts the incident light beam onto the primary mirror (3). The primary mirror (3) then reflects the light beam onto the convex grating (4), which is integrated with the meniscus lens (2). The convex grating (4) diffracts the incident light beam into the primary mirror (3), and the primary mirror (3) reflects the incident light beam back to the meniscus lens (2). The beam is refracted by the meniscus lens (2), wherein: the beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecenter of the image side is refracted by the first channel folding mirror (5) and imaged on the first channel detector (7); the beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecenter of the image side is refracted by the second channel folding mirror (6) and imaged on the second channel detector (8).

[0007] In some embodiments, the entrance slit (1) functions as a field stop.

[0008] In some embodiments, the material of the meniscus lens (2) is fused silica.

[0009] In some embodiments, the meniscus lens (2) is coated with an anti-reflective film that can cover the wavelengths of both channels.

[0010] In some embodiments, the primary reflector (3) is coated with an anti-reflection film.

[0011] In some embodiments, the grating line density of the convex grating (4) is matched with the off-axis amount of the field of view.

[0012] In some embodiments, the optical axes of the meniscus lens (2), the primary reflector (3), the convex grating (4), the first channel folding mirror (5), the second channel folding mirror (6), the first channel detector (7), and the second channel detector (8) are on the same horizontal line.

[0013] The ultraviolet dual-channel common-path imaging spectrometer in this embodiment includes: an entrance slit (1), a meniscus lens (2), a primary reflector (3), a convex grating (4), a first-channel folding mirror (5), a second-channel folding mirror (6), a first-channel detector (7), and a second-channel detector (8). In this embodiment, the ultraviolet dual-channel common-path imaging spectrometer adjusts the grating line density of the convex grating (4) and the off-axis amount of the incident beam so that the outgoing beams of the first-channel folding mirror (5) and the second-channel folding mirror (6) are imaged at the upper and lower ends of the incident beam by the first-channel detector (7) and the second-channel detector (8), thus realizing the imaging of the beams of two channels by one spectrometer. Compared with the design of one spectrometer for one channel, it saves space, weight, and cost. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of the ultraviolet dual-channel common optical path imaging spectrometer provided in Embodiment 1 of the present invention. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0017] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0018] Example 1

[0019] Please see Figure 1 According to an embodiment of the present invention, an ultraviolet dual-channel common-path imaging spectrometer is provided, comprising: an entrance slit (1), a meniscus lens (2), a primary mirror (3), a convex grating (4), a first-channel folding mirror (5), a second-channel folding mirror (6), a first-channel detector (7), and a second-channel detector (8).

[0020] The ultraviolet dual-channel common-path imaging spectrometer provided in this application operates as follows:

[0021] An incident light beam emitted from a telecentric forward telescope system enters the meniscus lens (2) through the entrance slit (1). The meniscus lens (2) refracts the incident light beam onto the primary mirror (3). The primary mirror (3) then reflects the light beam onto the convex grating (4), which is integrated with the meniscus lens (2). The convex grating (4) diffracts the incident light beam into the primary mirror (3), and the primary mirror (3) reflects the incident light beam back to the meniscus lens (2). The beam is refracted by the meniscus lens (2), wherein: the beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecenter of the image side is refracted by the first channel folding mirror (5) and imaged on the first channel detector (7); the beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecenter of the image side is refracted by the second channel folding mirror (6) and imaged on the second channel detector (8).

[0022] In this embodiment, the ultra-high spectral resolution ultraviolet dual-channel common optical path imaging spectrometer provided by the present invention adopts the structure of a front-mounted telescope system with image-side telecentricity. Therefore, the main rays of different fields of view are incident perpendicularly to the incident slit (1).

[0023] In this embodiment, the entrance slit (1) acts as a field stop, limiting the image height of the forward telescope system.

[0024] It is understandable that the incident slit (1) is placed off-axis according to the off-axis amount of the field of view of the incident beam, and the off-axis amount is determined according to the band range and spectral resolution of the two channels; the numerical aperture of the incident beam is referenced to the F number of the telescope system of the front docking.

[0025] In this embodiment, the meniscus lens (2) is made of fused silica and coated with an anti-reflective film, which can cover the wavelength of the dual channels and has the function of correcting aberrations.

[0026] In this embodiment, the primary reflector (3) is coated with an anti-reflection film, which can cover the wavelength of the dual channels.

[0027] In this embodiment, the grating line density of the convex grating (4) is matched with the off-axis amount of the field of view, and the grating line density of the convex grating (4) is determined by the band range and spectral resolution of the two channels.

[0028] It is understood that by optimizing the grating line density and the off-axis amount of the field of view, the beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecenter of the image side is refracted by the first channel folding mirror (5) and imaged on the first channel detector (7); the beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecenter of the image side is refracted by the second channel folding mirror (6) and imaged on the second channel detector (8).

[0029] It is understood that after passing through the first channel folding mirror (5) and the second channel folding mirror (6), the outgoing beam can be folded in two opposite directions to facilitate the access of the first channel detector (7) and the second channel detector (8) and to avoid mutual interference between the first channel detector (7) and the second channel detector (8).

[0030] In this embodiment, the optical axes of the meniscus lens (2), the primary reflector (3), the convex grating (4), the first channel folding mirror (5), the second channel folding mirror (6), the first channel detector (7), and the second channel detector (8) are on the same horizontal line, thereby reducing the assembly difficulty.

[0031] The ultraviolet dual-channel common-path imaging spectrometer in this embodiment of the invention adjusts the grating line density of the convex grating (4) and the off-axis amount of the incident beam so that the outgoing beams of the first channel folding mirror (5) and the second channel folding mirror (6) are imaged at the upper and lower ends of the incident beam by the first channel detector (7) and the second channel detector (8). This achieves beam imaging of two channels by one spectrometer, which saves space, weight and cost compared to the design of one spectrometer per channel.

[0032] The ultraviolet dual-channel common-path imaging spectrometer in this embodiment of the invention has ultra-high spectral resolution. With a pixel size of 18μm, it achieves a spectral resolution of 0.1nm and a spectral sampling of 0.05nm. Moreover, the MTF is close to the diffraction limit, resulting in good imaging quality. It also saves on the weight and volume of the instrument and has the advantages of a long slit and a small F number.

[0033] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0034] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0035] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of units or modules may be electrical or other forms.

[0036] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0037] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dual-channel ultraviolet common-path imaging spectrometer, characterized in that, include: The components are: entrance slit (1), meniscus lens (2), primary mirror (3), convex grating (4), first channel folding mirror (5), second channel folding mirror (6), first channel detector (7), and second channel detector (8), wherein: An incident beam emitted from the image-side telecentric front telescope system enters the meniscus lens (2) through the entrance slit (1). The meniscus lens (2) refracts the incident beam onto the primary mirror (3). The primary mirror (3) then reflects the beam onto the convex grating (4) integrated with the meniscus lens (2). The convex grating (4) diffracts the incident beam into the primary mirror (3). The primary mirror (3) reflects the incident beam back to the meniscus lens (2) and refracts it. The beam refracted by the meniscus lens (2) and located above the incident beam emitted from the image-side telecentric front telescope system is refracted by the first channel folding mirror (5) and imaged onto the first channel detector (7). The beam above the incident beam emitted from the front telescope system after being refracted by the meniscus lens (2) and located at the telecentric of the image side is refracted by the second channel folding mirror (6) and imaged on the second channel detector (8); Furthermore, the grating density of the convex grating (4) matches the off-axis amount of the field of view of the incident slit (1), so that the imaging beams received by the first channel detector (7) and the second channel detector (8) are located on opposite sides of the incident beam direction in space.

2. The ultraviolet dual-channel common-path imaging spectrometer according to claim 1, characterized in that, The entrance slit (1) functions as a field stop.

3. The ultraviolet dual-channel common-path imaging spectrometer according to claim 1, characterized in that, The material of the meniscus lens (2) is fused silica.

4. The ultraviolet dual-channel common-path imaging spectrometer according to claim 3, characterized in that, The meniscus lens (2) is coated with an anti-reflective film, which can cover the wavelength of the dual channels.

5. The ultraviolet dual-channel common-path imaging spectrometer according to claim 1, characterized in that, The primary reflector (3) is coated with an anti-reflection film, which can cover the wavelength of the dual channels.

6. The ultraviolet dual-channel common-path imaging spectrometer according to claim 1, characterized in that, The grating line density of the convex grating (4) is matched with the off-axis amount of the field of view.

7. The ultraviolet dual-channel common-path imaging spectrometer according to claim 1, characterized in that, The optical axes of the meniscus lens (2), the primary reflector (3), the convex grating (4), the first channel folding mirror (5), the second channel folding mirror (6), the first channel detector (7), and the second channel detector (8) are on the same horizontal line.

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