Miniaturized spectrometer

Abstract

The utility model provides a miniaturized spectrometer, including shell, dispersion element, detector and dodging device, the shell has the accommodation space and is communicated with the light through opening of accommodation space, dispersion element and detector are arranged in the accommodation space of shell, the light through opening is communicated with the light through opening, and the dispersion element and the detector are arranged in the light through opening. Wherein the light uniformizing device is arranged at the light passing opening of the shell, the light uniformizing device and the dispersion element are sequentially located on a light sensing path of the detector, the light uniformizing device comprises at least one light uniformizing unit and a film layer provided with an entrance slit, the film layer is formed on the surface of one side of the light uniformizing unit, and the entrance slit is formed on the surface of the other side of the light uniformizing unit. And the entrance slit corresponds to the dispersion element.

Description

Technical Field

[0001] This utility model relates to the field of spectral detection technology, and in particular to a miniaturized spectrometer. Background Technology

[0002] The description herein provides only background information in relation to this utility model and does not necessarily constitute prior art.

[0003] Light interacts with matter through processes such as absorption, scattering, fluorescence, and Raman spectroscopy, producing specific spectra. Each substance's spectrum is unique. Therefore, spectral information can be considered the "fingerprint" of everything. Spectrometers can directly detect the spectral information of substances, revealing the presence and composition of the target material. They are crucial testing instruments in fields such as materials characterization and chemical analysis.

[0004] A spectrometer is a scientific instrument that breaks down complex light into spectral lines. It consists of prisms or diffraction gratings and measures the light reflected from the surface of an object. The seven colors of sunlight are the portion that the naked eye can distinguish (visible light). However, if sunlight is broken down by a spectrometer and arranged by wavelength, visible light occupies only a small range of the spectrum; the rest are indistinguishable to the naked eye, such as infrared, microwaves, ultraviolet rays, and X-rays. By capturing light information with a spectrometer, developing it on photographic film, or displaying and analyzing the data using computerized automated instruments, the elements contained in an object can be determined. This technology has been widely used in the detection of air pollution, water pollution, food hygiene, and the metal industry.

[0005] Existing spectrometers are dispersive spectrometers, which typically consist of one or more diffraction gratings, an optical path length, and a photodetector array. In this array, the light signal from the target object is collimated and incident on the diffraction grating after passing through an entrance slit. The diffraction grating disperses the spectral components in different directions, and finally, a concave mirror focuses the dispersed spectral components onto the photodetector array to obtain the spectral distribution. While this type of spectrometer boasts ultra-high resolution, a wide spectral range, and mature technology, dispersive spectrometers rely on bulky dispersive elements and long optical path lengths, making size reduction difficult.

[0006] However, in existing technologies, to ensure good resolution in a spectrometer, it is generally necessary to ensure the performance of each component and its corresponding installation accuracy, while also requiring a sufficiently long optical path. Therefore, existing spectrometers are not only expensive but also relatively large in overall size. The shortcomings of existing spectrometers lie in their multi-component and long optical path requirements. On the one hand, the large number of components and high installation accuracy requirements of existing spectrometers undoubtedly increase manufacturing difficulty and cost; on the other hand, the need for numerous components and long optical paths also contributes to the overall large size of the spectrometer. Utility Model Content

[0007] A major advantage of this invention is that it provides a miniaturized spectrometer, wherein the design of the spectrometer eliminates the collimation element, thereby maintaining the spectrometer's performance at a good level as much as possible.

[0008] Another advantage of this invention is that it provides a miniaturized spectrometer, wherein the spectrometer is small in size while ensuring that the resolution meets the requirements, which is conducive to achieving structural miniaturization.

[0009] Another advantage of this invention is that it provides a miniaturized spectrometer, wherein the spectrometer improves resolution while ensuring size, which is beneficial to improving the working performance of the spectrometer.

[0010] Another advantage of this invention is that it provides a miniaturized spectrometer, wherein the optical component is arranged in front of the entrance slit to collect light, thereby expanding the recognition range and facilitating the use of the spectrometer.

[0011] According to one aspect of the present invention, a miniaturized spectrometer of the present invention, capable of achieving the aforementioned and other objectives and advantages, comprises:

[0012] A housing having a receiving space and a light-transmitting port communicating with the receiving space;

[0013] A dispersive element and a detector, wherein the dispersive element and the detector are disposed within the receiving space of the housing; and

[0014] A homogenizer, wherein the homogenizer is disposed at the light-transmitting port of the housing, the homogenizer and the dispersive element are sequentially located on the light-sensing path of the detector, wherein the homogenizer includes at least one homogenizing unit and a film layer having an entrance slit, wherein the film layer is formed on one side surface of the homogenizing unit, and the entrance slit corresponds to the dispersive element.

[0015] According to one embodiment of the present invention, the film layer of the light homogenizer is formed on the surface of the light homogenizing unit by means of coating; or the film layer is formed on the surface of the light homogenizing unit by means of attachment.

[0016] According to one embodiment of the present invention, the spectrometer further includes at least one optical element, wherein the at least one optical element is located at the front end of the light incident direction of the incident slit, and the incident light passes through the optical element and then through the incident slit to reach the dispersive element.

[0017] According to one embodiment of the present invention, the optical element is disposed in the housing, that is, the optical element is supported by the housing in front of the homogenizer.

[0018] According to one embodiment of the present invention, the housing is further provided with a mounting cavity, wherein the mounting cavity is connected to the light-transmitting port and is located at the front end of the light incident direction of the light homogenizer, and the optical element is fixed in the mounting cavity of the housing.

[0019] According to one embodiment of the present invention, the optical element is detachably disposed in the mounting cavity of the housing.

[0020] According to one embodiment of the present invention, the depth of the entrance slit is 1.5 to 4 mm.

[0021] According to one embodiment of the present invention, the depth of the entrance slit is 2 to 3 mm.

[0022] According to one embodiment of the present invention, the width of the entrance slit is 0.1-0.5 mm.

[0023] According to one embodiment of the present invention, the line connecting the center of the entrance slit and the center of the dispersive element and the line connecting the center of the detector and the center of the dispersive element form an angle of 30-120°.

[0024] According to one embodiment of the present invention, the spectral device further includes a processing unit, wherein the processing unit is electrically connected to the detector.

[0025] The further objectives and advantages of this invention will become fully apparent from the following description and accompanying drawings.

[0026] These and other objects, features and advantages of this invention will be fully apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0027] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the drawings, unless otherwise specified, the same reference numerals are used to denote the same parts. Wherein:

[0028] Figure 1 This is a schematic diagram of the overall structure of a miniaturized spectrometer according to the first preferred embodiment of the present invention.

[0029] Figure 2A and Figure 2B This is a schematic diagram of a homogenizer of the miniaturized spectrometer according to the first preferred embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of the miniaturized spectrometer in another optional real-time mode according to the preferred embodiment of the present invention.

[0031] Figure 4This is a schematic diagram of the entrance slit of the miniaturized spectrometer according to the preferred embodiment of the present invention. Detailed Implementation

[0032] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0033] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0034] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0035] Refer to the accompanying drawings in this application specification. Figures 1 to 2B As shown, a miniaturized spectrometer according to a first preferred embodiment of this application is illustrated in the following description. The miniaturized spectrometer includes a housing 10, a dispersive element 20, a detector 30, and a homogenizer 40. The housing 10 has a receiving space 101 and a light-transmitting port 102 communicating with the receiving space 101. The homogenizer 40 is disposed at the light-transmitting port 102 of the housing 10. The homogenizer 40 homogenizes the incident light, and the dispersive element 20 and the detector 30 are disposed within the receiving space 101 of the housing 10. The homogenizer 40 and the dispersive element 20 are sequentially located on the photosensitive path of the detector 30. After being homogenized by the homogenizer 40, the incident light reaches the dispersive element 20, where it is dispersed before reaching the detector 30, where the detector 30 receives the incident light signal. The housing 10 may include a receiving area (not shown) in which the homogenizer 40 is received, thereby increasing the reliability of the homogenizer 40 on the housing 10 after installation.

[0036] The homogenizer 40 includes at least one homogenizing unit 41 and a film layer 42 with an entrance slit 420. The film layer 42 is formed on one side surface of the homogenizing unit 41 and is made of an opaque material, allowing incident light to pass through the entrance slit 420. It is understood that the homogenizing unit 41 of the homogenizer 40 is not limited to a homogenizing sheet or homogenizing element. Therefore, in this preferred embodiment of the application, the film layer 42 of the homogenizer 40 is formed on the surface of the homogenizing unit 41 by coating; or the film layer 42 is formed on the surface of the homogenizing unit 41 by adhesion.

[0037] Preferably, in this preferred embodiment of the application, the homogenizing unit 41 of the homogenizer 40 faces the light-transmitting port 102 of the housing 10, that is, the opening direction of the incident slit 420 of the film layer 42 is opposite to or back-to-back with the direction of the light-transmitting port 102. In other words, the opening direction of the incident slit 420 of the film layer 42 is directly opposite to the dispersive element 20. Light incident from the light-transmitting port 102 is homogenized by the homogenizing unit 41 of the homogenizer 40, and then reaches the surface of the dispersive element 20 through the incident slit 420 of the film layer 42.

[0038] It is understood that in this preferred embodiment of the present application, the film layer 42 with the incident slit 420 is integrally formed on the surface of the homogenizing unit 41, and the homogenizer 40 is disposed on the housing 10. That is, the homogenizer 40 simultaneously functions as a homogenizer and an incident slit, thereby further integrating the device and allowing for further reduction in the size of the spectrometer. The incident slit 420 formed in the homogenizer 40 is opposite to the dispersive element 20, that is, incident light reaches the dispersive element 20 through the incident slit 420.

[0039] Preferably, in this preferred embodiment of the present application, the dispersive element 20 and the detector 30 are fixedly disposed in the accommodating space 101 of the housing 10. The homogenizer 40 may be located in the accommodating space 101 or outside the accommodating space 101. When the homogenizer 40 is located inside the accommodating space 101, a transparent cover plate may be provided at the light transmission port 102 of the spectrometer to protect the spectrometer and prevent dust from entering.

[0040] It is worth mentioning that the dispersive element 20 can be implemented as a diffraction grating, a blazed grating, etc., which mainly disperses the incident light. The detector array 30 can be implemented as a CCD chip, a CMOS chip, or other detectors, or it can be an imaging module that can receive the incident light signal.

[0041] like Figure 3 and Figure 4 As shown, the spectrometer further includes at least one optical element 50, wherein the at least one optical element 50 is located at the front end of the light incident direction of the incident slit 420, that is, the incident light passes through the optical element 50 and then through the incident slit 420 to reach the dispersive element 20. The optical element 50 can be implemented as a lens, a light homogenizer, a microlens array, etc., or it can be a transparent protective plate, such as a glass cover.

[0042] It is understandable that, due to the generally small size of the entrance slit 420, the corresponding recognition range of the spectrometer is small; that is, the object to be identified must be within the recognition range of the entrance slit 420, which is undoubtedly detrimental to the use of the spectrometer. Therefore, in this preferred embodiment of the present application, the optical element 50 is arranged in front of the light incident direction of the entrance slit 420 for light collection, thereby expanding the recognition range and facilitating the use of the spectrometer.

[0043] Preferably, the optical element 50 is disposed in the housing 10, that is, the optical element 50 is supported by the housing in front of the homogenizer 40, and the homogenizer 40 is preferably located inside the accommodating space 101.

[0044] In detail, the housing 10 further includes a mounting cavity 103, which communicates with the light-transmitting port 102 and is located at the front end of the light incident direction of the diffractor 40. The optical element 50 is fixed in the mounting cavity 103 of the housing 10. Preferably, the mounting cavity 103 and the light-transmitting port 102 are integrally formed in the housing 10, and the optical element 50 is mounted in the mounting cavity 103. The size of the mounting cavity 103 is adapted to the optical element 50.

[0045] It is understood that the mounting cavity 103 is located on the outside of the housing 10, that is, the mounting cavity 103 is a semi-groove structure formed on the outside of the housing 10, the optical element 50 is fixed in the mounting cavity 103, and one side of the optical element 50 faces the external environment.

[0046] In certain examples of this application, the optical element 50 is detachably disposed in the mounting cavity 103 of the housing 10, allowing for the replacement of the type of optical element 50 according to different needs; or the optical element 50 may not be used. For example, in low-light environments, the optical element 50 can be removed so that light can directly enter through the entrance slit 420, thus avoiding energy loss of the incident light by the optical element 50. For example, when focusing is required, optical elements such as lenses or microlens arrays can be mounted in the mounting cavity; when homogenization of the incident light is required, a light homogenizer can be mounted in the mounting cavity; and to prevent dust from entering the interior, a transparent protective plate, such as a glass cover, can be provided.

[0047] The spectrometer further includes a processing unit 60, wherein the processing unit 60 is electrically connected to the detector 30, and wherein the processing unit 60 may be disposed inside the housing 10 or outside the housing 10 of the spectrometer, without limitation.

[0048] In this preferred embodiment of the present application, the optical element 50 is preferably a light homogenizer, which is attached to the mounting cavity 103 of the housing 10. The entrance slit 420 is facing the dispersive element 20. Light incident on the entrance slit 420 through the optical element 50 reaches the surface of the dispersive element 20. It is understood that the incident light becomes more uniform after passing through the light homogenizer, and then enters the dispersive element through the entrance slit 420. The dispersive element disperses the incident light, reducing the polychromatic light incident from the slit to monochromatic light, which is then reflected at different angles onto the detector 30. The detector 30 receives the light source signal and converts it into an electrical signal, which is then transmitted to the computing unit. The computing unit analyzes the signal to obtain the polychromatic light spectral information. The analysis results are stored in the processing unit or output through a data transmission interface provided thereon.

[0049] It should be understood that, in this preferred embodiment of the present application, if the size of the entrance slit 420 and the distance from the exit point of the entrance slit 420 to the surface of the diffraction grating allow the spectrometer to be miniaturized as much as possible, the performance of the spectrometer will not be significantly affected. For example, the required resolution of the spectrometer is 1-10 nm, or within 5 nm, or even within 1 nm.

[0050] It is understood that the entrance slit 420 is a through-hole formed on the side or top of the homogenizer 40. The entrance slit 420 has a slit channel 401, an entrance port 402 located at the entrance end of the slit channel 401, and an exit port 403 located at the exit end of the slit channel 401. Let the width, depth, and length of the slit channel 401 of the entrance slit 420 be a, b, and c, respectively. In this embodiment, the width, depth, and length of the slit channel 401 of the entrance slit 420 can be understood as being defined by the film layer 40. The depth refers to the distance from the entrance port 402 to the exit port 403 along the incident direction of the incident light, i.e., the thickness of the film layer 42. The distance from the exit port 403 of the entrance slit 420 to the surface of the dispersive element 20 is l. Since the length c generally only needs to match the length of the dispersive element (grating, etc.), it has little impact on the optical path design and performance of the spectrometer. Therefore, the focus is on the relationship between the width a, depth b, and distance l of the entrance slit 420. The distance l is generally determined based on the spectrometer size requirements, the size of the entrance slit 420, and the limitations of the dispersive element 20. If the distance l is too small, the incident light cannot diffuse effectively, resulting in only a small portion of the grating working, which is detrimental to ensuring spectral accuracy. If the distance l is too large, the overall size of the spectrometer will be too large. Therefore, given a fixed spectrometer size, the dispersive element 20 can be positioned as far away from the entrance slit 420 as possible.

[0051] Furthermore, in this preferred embodiment of the present application, a lensless entrance slit 420 is used to collimate the optical path. When the entrance slit 420 is relatively large, its geometric dimensions control the size of the exit angle. For example... Figure 4 As shown, the incident angle is determined by the width and depth of the incident slit 420, tan(α / 2) = b / a. However, when the exit angle is too large (>10°), the spectral bandwidth exceeds 20 nanometers, affecting spectral accuracy, i.e., the resolution is poor. This effect can be defined as a geometric effect, and to a certain extent, it can be understood that the incident slit plays a role in controlling the exit angle in a geometric sense.

[0052] When the width of the entrance slit 420 is reduced to the micrometer scale, diffraction will play a major role. a(sinα + sinini) = mλ, the 0th order exit angle (<0.5 degrees) occupies the dominant energy, and the spectral bandwidth is less than 1 nm. However, at this size, the excessively small entrance slit 420 leads to a decrease in light transmittance and a drop in the system signal-to-noise ratio. It is necessary to calculate the diffraction effect when light passes through the entrance slit 420. For example, when collimated light is incident, the angle of the diffracted light is determined by the entrance slit width a and the dominant wavelength λ.

[0053] For example, the principal maximum angle width of level 0. Corresponding spectral width Where N is the number of grating lines and i is the incident angle; the spectral width Δλ can be further understood as the spectral resolution. Therefore, the larger the number of grating lines N, the larger the incident angle i, or the smaller Δθ, the smaller the corresponding resolution can be, and the higher the accuracy of the spectrometer. However, a smaller principal maximum angle width Δθ requires a larger width of the incident slit 420, which indicates that the function of the incident slit 420 in this invention cannot be explained solely by either geometric or diffraction effects.

[0054] In this preferred embodiment of the present application, the entrance slit 420 exerts both geometric and diffraction effects on the incident light. Under the combined effect of these two factors, the structure of the spectrometer can be simplified, and the optical path structure of the spectrometer can be optimized. In other words, the spectrometer of this preferred embodiment can achieve the required resolution without the need for a collimating lens, and the simplified structure facilitates miniaturization.

[0055] Specifically, in this preferred embodiment of the present application, the entrance slit 40 formed in the housing 10 can control the size of the entire optical path. When the depth of the entrance slit 40 is too small, the geometric effect is often large, which will increase the emission angle and lead to a decrease in resolution. Conversely, when the slit depth is too large, the intensity of the incident light will be too weakened, which is not conducive to subsequent detection. Therefore, in this invention, the depth of the entrance slit 40 is controlled to be between 1.5 and 4 mm. Preferably, the depth b of the entrance slit 40 is 2 to 3 mm, for example, 2 mm, 2.5 mm, or 3 mm. It should be noted that the depth b of the entrance slit 40 is affected to some extent by the width a of the entrance slit 40. The range of the depth b of the entrance slit 40 in this invention is also determined to some extent with reference to the width a of the entrance slit in this invention.

[0056] In this preferred embodiment of the present application, the entrance slit 40 formed in the housing 10 can control the size of the entire optical path. When the width of the entrance slit 40 is too large, the slit often does not produce a diffraction effect; while when the slit width is too small, the intensity of the incident light will be too weakened, which is not conducive to subsequent detection. When the spectral resolution reaches 1-5nm, the entrance slit 40 of the present invention needs to control the exit angle at about 1°. At this time, the width a of the entrance slit 40 can be set to 0.1-0.5mm. At this time, the geometric effect and the diffraction effect play a joint role. At the same time, the width of 0.1-0.5mm can effectively ensure the light efficiency, that is, ensure that the light transmittance is not too low, and also produce a geometric effect.

[0057] In this preferred embodiment of the present application, the incident light first enters the optical element 50, then enters the entrance slit 420 of the homogenizer 40, and after being subjected to the combined effects of geometric and diffraction, it exits and reaches the dispersive element 20 (grating). After being split by the grating, it is finally received by the detector 30.

[0058] It should be noted that in this invention, the line connecting the center of the entrance slit 420 and the center of the dispersive element 20, and the line connecting the center of the detector 30 and the center of the dispersive element 20, are at an angle of 30-120°. This means that by folding the optical path, the overall size of the spectrometer can be controlled. Preferably, the line connecting the center of the entrance slit 420 and the center of the dispersive element 20, and the line connecting the center of the detector 30 and the center of the dispersive element 20, are at an angle of 90°.

[0059] The housing 10 of this preferred embodiment can be formed by integral processing or by assembling multiple modules. The housing 10 includes a housing body 11, a support base 12 disposed on the housing body 11, and a bracket 13 for fixing the dispersive element 20. The housing body 11 and the support base 12 together form the accommodating space 101 of the housing 10. The support base 12 is located below the housing body 11, and the detector 30 and the processing unit 60 are disposed on the support base 12. The support base 12 can also be implemented as a circuit board, electrically connected to the detector 30.

[0060] It is worth mentioning that, in this preferred embodiment of the present application, the light-transmitting port 102 is formed on a side wall of the housing body 11, and the height of the incident slit 420 is approximately the same as the height at which the dispersive element 20 is fixed.

[0061] The bracket 13 is disposed inside the top of the housing body 11, opposite to the support base 12, and the dispersive element 20 is fixed within the accommodating space 101 by the bracket 13. It is worth noting that in this preferred embodiment of the present application, the bracket 13 has a fixed support surface, and the fixed support surface of the bracket 13 is an inclined surface, inclined towards the direction of the entrance slit 420, so that the light incident from the entrance slit 420 reaches the surface of the dispersive element 20.

[0062] In another optional embodiment of this application, the detector 30 can also be implemented as an imaging module, wherein the imaging module includes a detector and an optical lens, the optical lens being located on the photosensitive path of the detector. In certain embodiments of this application, the spectrometer may further include a filter located between the optical lens and the detector. To better receive incident light, the FOV of the imaging module needs to be 40-150°, preferably 45-100°. Further, the imaging module includes a circuit board, and the detector is electrically connected to the circuit board.

[0063] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A miniaturized spectrometer, characterized in that, include: A housing having a receiving space and a light-transmitting port communicating with the receiving space; A dispersive element and a detector, wherein the dispersive element and the detector are disposed in the receiving space of the housing; as well as A homogenizer, wherein the homogenizer is disposed at the light-transmitting port of the housing, the homogenizer and the dispersive element are sequentially located on the light-sensing path of the detector, wherein the homogenizer includes at least one homogenizing unit and a film layer having an entrance slit, wherein the film layer is formed on one side surface of the homogenizing unit, and the entrance slit corresponds to the dispersive element.

2. The miniaturized spectrometer according to claim 1, wherein the film layer of the homogenizer is formed on the surface of the homogenizing unit by means of coating; or the film layer is formed on the surface of the homogenizing unit by means of attachment.

3. The miniaturized spectrometer according to claim 2, wherein the spectrometer further comprises at least one optical element, wherein the at least one optical element is located at the front end of the light incident direction of the incident slit, and the incident light passes through the optical element and then through the incident slit to reach the dispersive element.

4. The miniaturized spectrometer according to claim 3, wherein the optical element is disposed in the housing, that is, the optical element is supported by the housing in front of the homogenizer.

5. The miniaturized spectrometer according to claim 4, wherein the housing is further provided with a mounting cavity, wherein the mounting cavity is connected to the light-transmitting port and is located at the front end of the light incident direction of the homogenizer, and the optical element is fixed in the mounting cavity of the housing.

6. The miniaturized spectrometer according to claim 5, wherein the optical element is detachably disposed in the mounting cavity of the housing.

7. The miniaturized spectrometer according to claim 1, wherein the depth of the entrance slit is 1.5 to 4 mm.

8. The miniaturized spectrometer according to claim 1, wherein the depth of the entrance slit is 2 to 3 mm.

9. The miniaturized spectrometer according to claim 1, wherein the width of the entrance slit is 0.1-0.5 mm.

10. The miniaturized spectrometer according to claim 1, wherein the line connecting the center of the entrance slit and the center of the dispersive element and the line connecting the center of the detector and the center of the dispersive element form an angle of 30-120°.

11. The miniaturized spectrometer according to claim 1, wherein the spectroscopic device further includes a processing unit, wherein the processing unit is electrically connected to the detector.

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