Scattering device and speckle spectrometer based on scattering medium flakes

Abstract

The present application relates to a kind of scattering device based on scattering medium wafer and speckle spectrometer.The scattering device includes adjustable laser, first single-mode optical fiber, second single-mode optical fiber, polarizer, scattering medium wafer and area array detector, wherein, in the direction perpendicular to incident light, scattering medium wafer includes more than two scattering zones, the light transmittance of different scattering zones is different, and the difference between maximum light transmittance and minimum light transmittance is 20%~80%.The scattering device of the present application is combined with fiber spectrometer by hierarchical spectrum random control idea, applied in speckle spectrometer, so that the randomness of speckle pattern is enhanced, while achieving excellent spectral resolution performance, the miniaturization, low cost of speckle spectrometer is realized.

Description

Technical Field

[0001] This invention relates to the field of spectral data acquisition technology, and in particular to a scattering device and speckle spectrometer based on a thin sheet of scattering medium. Background Technology

[0002] Spectrometers are important tools for scientific research and industrial applications, such as physical and biochemical sensing, materials analysis, and light source characterization. Random scattering spectrometers are widely used because of the sufficient diversity of materials in terms of spectral projection, allowing for precise measurement of the spectral-dependent polarization state of light fields. However, the low total transmittance of the scattering system in random spectrometers means that most of the input signal is reflected rather than transmitted, limiting the spectrometer's sensitivity.

[0003] This led to the development of speckle spectrometers based on multimode fiber, single-mode fiber, or single-mode fiber connected to random media. However, due to the limited number of guiding modes, spectrometers based on multimode fiber are often limited by the trade-off between resolution and bandwidth. Typically, several meters of multimode fiber are needed to achieve picometer-level spectral resolution, and even using principal component analysis, femtometer and attometer-level resolutions can only be achieved within limited bandwidth. Furthermore, random media are generally made of large materials such as integrating spheres, disordered photonic crystals and chips, natural pearls, scattering components, optical fibers and waveguides, and random scatterers, which cannot achieve good integration and miniaturization.

[0004] Therefore, achieving low cost and miniaturization of high-precision spectrometers remains a challenge to this day. Summary of the Invention

[0005] Therefore, it is necessary to provide a scattering device and speckle spectrometer based on a thin sheet of scattering medium to address the above problems. The speckle spectrometer achieves excellent spectral resolution while also being low in cost and miniaturized.

[0006] According to a first aspect of the present invention, a scattering device based on a scattering medium sheet is provided, comprising:

[0007] A tunable laser is used to provide incident light;

[0008] The first single-mode fiber and the second single-mode fiber are disposed in the optical path of the incident light to enable the incident light to have a single mode.

[0009] A polarizer, connected between the first single-mode fiber and the second single-mode fiber, is used to ensure that the incident light has the same polarization.

[0010] A scattering medium sheet, connected to the second single-mode fiber, is used to refract the incident light, so that the incident light is scattered in the optical path to form a unique scattering pattern.

[0011] An array detector is positioned along the scattering pattern of the scattering medium sheet to receive and record the scattering pattern.

[0012] In the direction perpendicular to the incident light, the scattering medium sheet includes two or more scattering regions, each with a different transmittance, and the difference between the maximum and minimum transmittance is 20% to 80%.

[0013] In one embodiment, the difference between the maximum transmittance and the minimum transmittance is 40% to 80%.

[0014] In one embodiment, the transmittance of the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light.

[0015] In one embodiment, the scattering medium sheet includes a polymer matrix and micro / nano scattering particles dispersed in the polymer matrix, wherein the volume doping concentration of the micro / nano scattering particles in the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light.

[0016] And / or, the particle size of the micro-nano scattering particles in the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light;

[0017] And / or, the transmittance of the micro-nano scattering particles in the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light.

[0018] In one embodiment, the micro / nano scattering particles are inorganic micro / nano particles; wherein, the inorganic micro / nano particles are selected from at least one of silicon dioxide particles, titanium dioxide particles, aluminum oxide particles, magnesium oxide particles, calcium fluoride particles, magnesium fluoride particles, and lithium fluoride particles.

[0019] And / or, the polymer matrix is ​​selected from at least one of polydimethylsiloxane, polyethylene matrix, polypropylene matrix, polyester matrix, polyamide matrix, polymethyl methacrylate matrix, fluorinated polymethyl methacrylate matrix, polystyrene matrix, polyvinylidene fluoride matrix, polyurethane matrix, and polyethylene terephthalate matrix.

[0020] In one embodiment, the volume doping concentration of the micro / nano scattering particles in the scattering medium sheet is 0.01 vol.% to 20 vol.%.

[0021] And / or, the particle size of the micro-nano scattering particles in the scattering medium sheet is 0.01 μm to 100 μm.

[0022] In one embodiment, the doping concentration of the micro-nano scattering particles in the scattering medium sheet is 0.1 vol.% to 10 vol.%.

[0023] And / or, the particle size of the micro-nano scattering particles in the scattering medium sheet is 0.05μm to 0.5μm.

[0024] In one embodiment, the thickness of the scattering medium sheet is 0.001 mm to 10 mm.

[0025] In one embodiment, the thickness of the scattering medium sheet is 0.001 mm to 1 mm.

[0026] According to a second aspect of the invention, a speckle spectrometer is provided, comprising a preset calibration system, a scattering device, and a computer.

[0027] The preset calibration system is used to acquire preset calibration information;

[0028] The scattering device is used to acquire a scattering pattern;

[0029] The computer receives the scattering pattern and calculates the spectrum based on preset calibration information and spectral reconstruction.

[0030] The scattering device is a scattering device based on a thin sheet of scattering medium.

[0031] This invention relates to a scattering device based on a thin scattering medium sheet. By setting scattering regions with different transmittances in the direction perpendicular to the incident light on the scattering medium sheet, spectral modulation of different regions is achieved, creating spatial differences and thus separating light of different wavelengths in space. Furthermore, by using the scattering device of this invention in a speckle spectrometer, and combining it with a fiber optic spectrometer through a hierarchical spectral random modulation approach, the randomness of the speckle pattern is enhanced. This achieves excellent spectral resolution while simultaneously miniaturizing the spectrometer and reducing costs. Attached Figure Description

[0032] Figure 1 A schematic diagram of the scattering device based on a scattering medium sheet provided by the present invention;

[0033] Figure 2 This is a schematic diagram showing the gradient distribution of TiO2 particle size in space within the scattering medium thin film provided in Embodiment 3 of the present invention;

[0034] Figure 3 The transmission spectrum of the scattering medium sheet doped with TiO2 particles of different sizes provided in Embodiment 3 of the present invention;

[0035] Figure 4 Transmission spectra of thin films of scattering medium doped with different volume concentrations provided in Embodiment 4 of the present invention;

[0036] Figure 5 The transmission spectra of different micro / nano scattering particles in the scattering medium sheet provided in Embodiment 5 of the present invention;

[0037] Figure 6 The spectral information reconstruction results of the speckle spectrometer provided in Embodiment 6 of the present invention are compared with the spectral results measured by spectrometers on the market.

[0038] Figure 7 The spectral information reconstruction results of the speckle spectrometer provided in Embodiment 7 of the present invention are compared with the spectral results measured by spectrometers on the market.

[0039] Figure 8 The spectral information reconstruction results of the speckle spectrometer provided in Embodiment 8 of the present invention are compared with the spectral results measured by spectrometers on the market.

[0040] Figure 9 The spectral information reconstruction results of the speckle spectrometer provided in Embodiment 9 of the present invention are compared with the spectral results measured by spectrometers on the market.

[0041] Figure 10 The spectral information reconstruction results of the speckle spectrometer provided in Embodiment 10 of the present invention are compared with the spectral results measured by spectrometers on the market.

[0042] In the diagram: 1. Tunable laser; 2. First single-mode fiber; 3. Second single-mode fiber; 4. Polarizer; 5. Scattering medium sheet; 6. Area array detector. Detailed Implementation

[0043] To facilitate understanding of the present invention, it will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments or examples only and is not intended to be limiting of the invention.

[0045] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe features or characteristics, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0046] According to a first aspect of the invention, such as Figure 1 As shown, a scattering device based on a scattering medium sheet is provided, wherein a first single-mode fiber 2, a polarizer 4, a second single-mode fiber 3, a scattering medium sheet 5, and an area array detector 6 are arranged sequentially in the optical path of the incident light.

[0047] Specifically, tunable laser 1 is used to provide incident light;

[0048] The first single-mode fiber 2 and the second single-mode fiber 3 are disposed in the optical path of the incident light to enable the incident light to have a single mode.

[0049] Polarizer 4 is connected between the first single-mode fiber 2 and the second single-mode fiber 3 to ensure that the incident light has the same polarization.

[0050] The scattering medium sheet 5 is connected to the second single-mode fiber 3 and is used to refract the incident light so that the optical path of the incident light is scattered to form a unique scattering pattern.

[0051] An array detector 6 is positioned in the direction of the scattering pattern of the scattering medium sheet 5, and is used to receive and record the scattering pattern;

[0052] In the direction perpendicular to the incident light, the scattering medium sheet 5 includes two or more scattering regions, each with a different transmittance, and the difference between the maximum and minimum transmittance is 20% to 80%.

[0053] The present invention provides a scattering device based on a scattering medium sheet 5, wherein the scattering medium sheet 5 includes two or more scattering regions with different transmittances, i.e., a difference in transmittance exists between adjacent scattering regions. By spectral modulation of different regions, a certain difference is created spatially, thereby separating light of different wavelengths in space. Light of different wavelengths is scattered to different detection units at different proportions, and the detection information on each detection unit can construct a set of light intensity signals. Since there is a one-to-one correspondence between the incident light wavelength and the speckle pattern, wavelength information can be obtained by identifying the speckle. When the input light is multi-wavelength, the output image is a superposition of speckles generated by each monochromatic wavelength.

[0054] In this invention, the difference between the maximum and minimum transmittance of the scattering medium sheet 5 is set to 20%–80%, preferably 40%–80%. This allows for excellent separation of light of different wavelengths.

[0055] In one embodiment, the difference in transmittance between any adjacent scattering regions of the scattering medium sheet 5 can enhance spectral resolution. The transmittance variation in the direction perpendicular to the incident light can be disordered; for example, the first scattering region may have a transmittance of 10% for 532nm incident light, the second scattering region 60%, and the third scattering region 20%. Preferably, the transmittance variation is ordered, such as the transmittance of the scattering medium sheet 5 increasing or decreasing sequentially in the direction perpendicular to the incident light. By sequentially increasing and decreasing the transmittance in the direction perpendicular to the incident light, the scattering medium sheet 5 in this invention creates a gradient difference in transmittance for the same wavelength in different gradient regions, and these gradient differences differ for different wavelengths, resulting in different optimal spectral resolution regions for different wavelengths of light.

[0056] The scattering medium sheet 5 in this invention comprises a polymer matrix and micro / nano scattering particles dispersed in the polymer matrix. To make the transmittance of the scattering medium sheet 5 increase or decrease sequentially in the direction perpendicular to the incident light, this invention provides three specific embodiments:

[0057] In the first embodiment, since the volume doping concentration of the micro-nano scattering particles is different, the transmittance of the incident light is different. Therefore, the different volume doping concentrations of the micro-nano scattering particles are sequentially increased or decreased in the direction perpendicular to the incident light to obtain a scattering medium sheet 5 with a concentration gradient distribution.

[0058] The specific preparation method is as follows:

[0059] The micro-nano scattering particles were blended with a polymer matrix material to prepare at least two mixed solutions with different volume doping concentrations.

[0060] The mixture is then layered and solidified in order of increasing or decreasing volume doping concentration of micro-nano scattering particles, and sliced ​​to obtain the scattering medium sheet 5.

[0061] Specifically, the volume doping concentration of the micro / nano scattering particles in the mixture is 0.01 vol.% to 20 vol.%, preferably 0.1 vol.% to 10 vol.%.

[0062] In the second embodiment, since the micro-nano scattering particles have different particle sizes and different transmittance to incident light, the different particle sizes of the micro-nano scattering particles are sequentially increased or decreased in the direction perpendicular to the incident light to obtain a scattering medium sheet 5 with a particle size distribution.

[0063] The specific preparation method is as follows:

[0064] The micro-nano scattering particles of different sizes are blended with a polymer matrix material to obtain a mixture of at least two different particle sizes.

[0065] The mixture is then layered and solidified in order of increasing or decreasing particle size of the micro-nano scattering particles, and sliced ​​to obtain the scattering medium sheet 5.

[0066] Specifically, the particle size of the micro-nano scattering particles in the mixture is 0.01 μm to 100 μm, preferably 0.05 μm to 0.5 μm.

[0067] In the third embodiment, since different micro-nano scattering particles have different transmittance, the different micro-nano scattering particles are arranged in order of increasing or decreasing transmittance in the direction perpendicular to the incident light to obtain a scattering medium sheet 5 with material regional distribution.

[0068] The specific preparation method is as follows:

[0069] The micro-nano scattering particles with different transmittances are blended with a polymer matrix material to obtain a mixture with at least two transmittances.

[0070] The mixture is layered and cured in order of increasing or decreasing light transmittance of micro-nano scattering particles, and then sliced ​​to obtain the scattering medium sheet 5.

[0071] This invention aims to prepare a scattering medium sheet 5 with the transmittance increasing or decreasing sequentially in the direction perpendicular to the incident light. It is not limited to the three embodiments described above; the particle size, volume doping concentration, or at least two of the materials used in the micro / nano scattering particles can also be controlled to achieve the same sequential increase or decrease in transmittance. Since the three embodiments provided by this invention only control a single variable, the preparation method is simpler and therefore preferred.

[0072] Specifically, the micro / nano scattering particles are inorganic micro / nano particles, and the inorganic micro / nano particles selected in this invention have excellent light transmittance to the light source. Preferably, the inorganic micro / nano particles of this invention are selected from at least one of silicon dioxide particles, titanium dioxide particles, aluminum oxide particles, magnesium oxide particles, calcium fluoride particles, magnesium fluoride particles, and lithium fluoride particles.

[0073] The polymer matrix selected in this invention is selected from at least one of polydimethylsiloxane, polyethylene matrix, polypropylene matrix, polyester matrix, polyamide matrix, polymethyl methacrylate matrix, fluorinated polymethyl methacrylate matrix, polystyrene matrix, polyvinylidene fluoride matrix, polyurethane matrix, and polyethylene terephthalate matrix.

[0074] In one embodiment, the thickness of the scattering medium sheet 5 is 0.001 mm to 10 mm. Preferably, the thickness of the scattering medium sheet 5 is 0.001 mm to 1 mm. By setting the thickness of the scattering medium sheet 5 to 0.001 mm to 1 mm, a better refraction effect is achieved for incident light.

[0075] According to a second aspect of the present invention, a speckle spectrometer is provided, comprising a preset calibration system, a scattering device, and a computer.

[0076] The preset calibration system is used to acquire preset calibration information;

[0077] The scattering device is used to acquire a scattering pattern;

[0078] The computer receives the scattering pattern and calculates the spectrum based on preset calibration information and spectral reconstruction.

[0079] The scattering device is selected from the scattering device based on the scattering medium sheet 5 mentioned above.

[0080] Specifically, the method of using the speckle speckle spectrometer provided by this invention is as follows:

[0081] Before use, a preset calibration should be performed using a preset test system with a calibrated light source of quasi-monochromatic light with adjustable wavelength.

[0082] In use, the laser modulator provides incident light, which passes through a single-mode fiber and a fiber polarizer in sequence. After passing through the scattering medium sheet 5, a unique scattering spectrum is obtained, and the area array detector receives and records the scattering spectrum.

[0083] Finally, the spectrum is obtained through preset calibration information and spectral reconstruction calculations.

[0084] The speckle spectrometer provided by this invention uses a scattering device based on a thin sheet of scattering medium 5. By introducing the hierarchical spectral random control concept of micro-nano scattering particles and combining it with a fiber optic spectrometer, the randomness of the speckle pattern is enhanced. This achieves excellent spectral resolution while miniaturizing the spectrometer and reducing costs.

[0085] The following specific embodiments will further illustrate the scattering device and speckle spectrometer based on the scattering medium sheet.

[0086] Example 1

[0087] This embodiment provides a scattering device based on a scattering medium sheet, including a tunable laser 1, a first single-mode fiber 2, a second single-mode fiber 3, a polarizer 4, a scattering medium sheet 5, and an area array detector 6. The tunable laser 1 is used to provide incident light. In the optical path of the incident light, the first single-mode fiber 2, the polarizer 4, the second single-mode fiber 3, and the scattering medium sheet 5 are connected in sequence. The area array detector 6 is located in the scattering direction of the scattering medium sheet 5 and is used to receive and record the scattering pattern.

[0088] The specific preparation method of the scattering medium sheet 5 is as follows:

[0089] Silica particles with a diameter of 100 nm were chemically dissolved and mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a first mixture with a doping concentration of 5 vol.%.

[0090] Titanium dioxide particles with a particle size of 100 nm were chemically dissolved and mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a second mixture with a doping concentration of 5 vol.%.

[0091] First, pour the first mixture into a mold and heat it to cure. Then, pour the second mixture into the same mold and heat it to cure, resulting in a blocky solid.

[0092] The solid block was sliced ​​to obtain a scattering medium thin film 5 with a thickness of 100 μm.

[0093] In this embodiment, the scattering medium sheet 5 includes two scattering regions in the direction perpendicular to the incident light, namely a silicon dioxide scattering region and a titanium dioxide scattering region.

[0094] Example 2

[0095] The difference between this embodiment and Embodiment 1 is that the scattering medium sheet 5 is different, and the specific preparation method is as follows:

[0096] Titanium dioxide particles with a particle size of 10 nm were chemically dissolved and mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a first mixture with a doping concentration of 5 vol.%.

[0097] Titanium dioxide particles with a particle size of 70 nm were chemically dissolved and mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a second mixture with a doping concentration of 5 vol.%.

[0098] Titanium dioxide particles with a particle size of 30 nm were chemically dissolved and mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a third mixture with a doping concentration of 5 vol.%.

[0099] First, the first mixture is poured into a mold and heated to cure. Then, the second mixture is poured into the same mold and heated to cure. Finally, the third mixture is poured into the same mold and heated to cure, resulting in a blocky solid.

[0100] The solid block was sliced ​​to obtain a scattering medium thin film 5 with a thickness of 100 μm.

[0101] The scattering medium sheet 5 in this embodiment includes three scattering regions in sequence in the direction perpendicular to the incident light: a scattering region with a particle size of 10 nm, a scattering region with a particle size of 70 nm, and a scattering region with a particle size of 30 nm.

[0102] Example 3

[0103] The difference between this embodiment and Embodiment 1 is that the scattering medium sheet 5 is different, and the specific preparation method is as follows:

[0104] Titanium dioxide with a particle size of 10 nm was mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a first mixture with a doping concentration of 5 vol.%.

[0105] Titanium dioxide with a particle size of 30 nm and polydimethylsiloxane were mixed at a volume ratio of 1:19 to obtain a second mixture with a doping concentration of 5 vol.%.

[0106] Titanium dioxide with a particle size of 70 nm and polydimethylsiloxane were mixed at a volume ratio of 1:19 to obtain a third mixture with a doping concentration of 5 vol.%.

[0107] First, the first mixture is poured into a mold and heated to cure. Then, the second mixture is poured into the same mold and heated to cure. Finally, the third mixture is poured into the same mold and heated to cure, resulting in a blocky solid with a particle size gradient distribution.

[0108] The solid block was sliced ​​to obtain a scattering medium thin film with a thickness of 100 μm, which is scattering medium thin film 5.

[0109] In this embodiment, the scattering medium sheet 5 has scattering regions with a particle size of 10 nm, a scattering region with a particle size of 30 nm, and a scattering region with a particle size of 70 nm arranged sequentially in the direction perpendicular to the incident light. Figure 2 As shown from left to right in the image.

[0110] The transmittance of the scattering medium thin film 5 was obtained by measuring with a commercially available spectrometer as follows: Figure 3 As shown, through Figure 3 It can be seen that the transmission spectrum of the scattering region with different particle size distribution has strong spectral selectivity.

[0111] Example 4

[0112] The difference between this embodiment and Embodiment 1 is that the scattering medium sheet 5 is different, and the specific preparation method is as follows:

[0113] 100 nm titanium dioxide particles were mixed with polydimethylsiloxane at a volume ratio of 1:95 to obtain a first mixture with a doping concentration of 1 vol.%.

[0114] 100 nm titanium dioxide particles were mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a second mixture with a doping concentration of 5 vol.%.

[0115] 100 nm titanium dioxide particles were mixed with polydimethylsiloxane at a volume ratio of 1:10 to obtain a third mixture with a doping concentration of 10 vol.%.

[0116] First, the first mixture is poured into a mold and heated to cure. Then, the second mixture is poured into the same mold and heated to cure. Finally, the third mixture is poured into the same mold and heated to cure, resulting in a blocky solid with a concentration gradient distribution.

[0117] The solid block was sliced ​​to obtain a scattering medium thin film 5 with a thickness of 100 μm.

[0118] In this embodiment, the scattering medium sheet 5 has scattering regions with a doping concentration of 1 vol.%, a doping concentration of 5 vol.%, and a doping concentration of 10 vol.% sequentially arranged in a direction perpendicular to the incident light. The transmittance of the scattering medium sheet 5 was measured using a commercially available spectrometer as follows: Figure 4 As shown, through Figure 4 It can be seen that the transmission spectrum of the scattering region with different volume doping concentrations has strong spectral selectivity.

[0119] Example 5

[0120] The difference between this embodiment and Embodiment 1 is that the scattering medium sheet 5 is different, and the specific preparation method is as follows:

[0121] Silica particles with a diameter of 100 nm were mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a first mixture in which the scattering micro-nano particles are silica.

[0122] Titanium dioxide particles with a particle size of 100 nm were mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a second mixture in which the scattering micro-nano particles are titanium dioxide.

[0123] Zinc oxide particles with a diameter of 100 nm were mixed with polydimethylsiloxane at a volume ratio of 1:19 to obtain a third mixture in which the scattering micro-nano particles were zinc oxide.

[0124] First, the first mixture is poured into a mold and heated to cure. Then, the second mixture is poured into the same mold and heated to cure. Finally, the third mixture is poured into the same mold and heated to cure, resulting in a blocky solid with a gradient material distribution.

[0125] The solid block was sliced ​​to obtain a scattering medium thin film 5 with a thickness of 100 μm.

[0126] In this embodiment, the scattering medium sheet 5 is provided with a silicon dioxide scattering region, a titanium dioxide scattering region, and a zinc oxide scattering region in sequence in the direction perpendicular to the incident light. The transmittance of the scattering medium sheet 5 is measured using a commercially available spectrometer as follows: Figure 5 As shown, through Figure 5 It can be seen that the transmission spectrum of the scattering region of different micro-nano scattering particles has strong spectral selectivity.

[0127] Example 6

[0128] This embodiment provides a speckle spectrometer, including a preset calibration system, a scattering device, and a computer;

[0129] The scattering device selected is the scattering device based on the scattering medium sheet 5 provided in Example 1.

[0130] Example 7

[0131] The difference between this embodiment and embodiment 6 is that the scattering device selected is the scattering device based on the scattering medium sheet 5 provided in embodiment 2.

[0132] Example 8

[0133] The difference between this embodiment and embodiment 6 is that the scattering device selected is the scattering device based on the scattering medium sheet 5 provided in embodiment 3.

[0134] Example 9

[0135] The difference between this embodiment and embodiment 6 is that the scattering device selected is the scattering device based on the scattering medium sheet 5 provided in embodiment 4.

[0136] Example 10

[0137] The difference between this embodiment and embodiment 6 is that the scattering device selected is the scattering device based on the scattering medium sheet 5 provided in embodiment 5.

[0138] The speckle speckle spectrometers prepared in Examples 6 to 10 of this invention were compared with the commercially available Agilent Cary 5000 spectrometer in terms of spectral detection. The incident light was set to an adjustable incident light of 520 nm to 620 nm. The comparison graphs of the obtained spectral detection signals and those obtained by the commercially available spectrometer are shown in the figure. Figures 6 to 10 As shown. According to Figures 6 to 10As can be seen, the speckle spectrometers prepared in Examples 6 to 10 of this invention produce the same detection results as commercially available spectrometers, demonstrating excellent spectral testing accuracy. Therefore, this invention, through the comprehensive application of material design and structural configuration, and by introducing a hierarchical spectral random control approach using random particles, combines these with fiber optic spectrometer results to achieve excellent spectral resolution while also possessing advantages such as low cost and small size. Furthermore, the miniature spectrometer prepared by this invention can be designed with different scattering media according to the target wavelength, making it suitable for various spectral detection fields.

[0139] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0140] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A scattering device based on a thin sheet of scattering medium, characterized in that, include: A tunable laser is used to provide incident light; The first single-mode fiber and the second single-mode fiber are disposed in the optical path of the incident light to enable the incident light to have a single mode. A polarizer, connected between the first single-mode fiber and the second single-mode fiber, is used to ensure that the incident light has the same polarization. A scattering medium sheet, connected to the second single-mode fiber, is used to refract the incident light, so that the incident light is scattered in the optical path to form a unique scattering pattern. An array detector is positioned along the scattering pattern of the scattering medium sheet to receive and record the scattering pattern. In the direction perpendicular to the incident light, the scattering medium sheet includes two or more scattering regions, each with a different transmittance, and the difference between the maximum and minimum transmittance is 20% to 80%.

2. The scattering device based on a scattering medium sheet according to claim 1, characterized in that, The difference between the maximum and minimum light transmittance is 40% to 80%.

3. The scattering device based on a scattering medium sheet according to claim 1 or 2, characterized in that, The transmittance of the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light.

4. The scattering device based on a scattering medium sheet according to claim 3, characterized in that, The scattering medium sheet includes a polymer matrix and micro / nano scattering particles dispersed in the polymer matrix, wherein the volume doping concentration of the micro / nano scattering particles in the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light. And / or, the particle size of the micro-nano scattering particles in the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light; And / or, the transmittance of the micro-nano scattering particles in the scattering medium sheet increases or decreases sequentially in the direction perpendicular to the incident light.

5. The scattering device based on a scattering medium sheet according to claim 4, characterized in that, The micro-nano scattering particles are inorganic micro-nano particles; wherein, the inorganic micro-nano particles are selected from at least one of silicon dioxide particles, titanium dioxide particles, aluminum oxide particles, magnesium oxide particles, calcium fluoride particles, magnesium fluoride particles, and lithium fluoride particles. And / or, the polymer matrix is ​​selected from at least one of polydimethylsiloxane, polyethylene matrix, polypropylene matrix, polyester matrix, polyamide matrix, polymethyl methacrylate matrix, fluorinated polymethyl methacrylate matrix, polystyrene matrix, polyvinylidene fluoride matrix, polyurethane matrix, and polyethylene terephthalate matrix.

6. The scattering device based on a scattering medium sheet according to claim 4, characterized in that, The volume doping concentration of the micro-nano scattering particles in the scattering medium sheet is 0.01 vol.% to 20 vol.%. And / or, the particle size of the micro-nano scattering particles in the scattering medium sheet is 0.01 μm to 100 μm.

7. The scattering device based on a scattering medium sheet according to claim 6, characterized in that, The volume doping concentration of the micro-nano scattering particles in the scattering medium sheet is 0.1 vol.% to 10 vol.%. And / or, the particle size of the micro-nano scattering particles in the scattering medium sheet is 0.05μm to 0.5μm.

8. The scattering device based on a scattering medium sheet according to claim 4, characterized in that, The thickness of the scattering medium sheet is 0.001 mm to 10 mm.

9. The scattering device based on a scattering medium sheet according to claim 1, characterized in that, The thickness of the scattering medium sheet is 0.001 mm to 1 mm.

10. A speckle spectrometer, characterized in that, Includes a pre-set calibration system, a scattering device, and a computer. The preset calibration system is used to acquire preset calibration information; The scattering device is used to acquire a scattering pattern; The computer receives the scattering pattern and calculates the spectrum based on preset calibration information and spectral reconstruction. The scattering device is selected from the scattering device based on a scattering medium sheet as described in any one of claims 1 to 9.

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