A portable wheat moisture content detection device based on near-infrared fluorescent ceramics

Abstract

The utility model discloses a portable wheat moisture content detection device based on near infrared fluorescent ceramics relates to near infrared grain quality detection technical field, including microcontroller still including shell, be equipped with excitation source round heat dissipation fin in the chamber of shell, be equipped with lens subassembly in the middle hole of excitation source round heat dissipation fin, be equipped with LD excitation source on the lens subassembly, the tail portion mounting of shell is used for the rear cover of encapsulation excitation source round heat dissipation fin, the detachable connection of shell has the ceramic subassembly corresponding with LD excitation source light side, still be equipped with ceramic conical heat dissipation fin in the chamber of shell, be equipped with the light cup corresponding with ceramic subassembly light side in ceramic conical heat dissipation fin, the front end of shell is equipped with material box subassembly, be equipped with photosensitive subassembly for receiving detection reflected light in material box subassembly, photosensitive subassembly and microcontroller electricity is connected. Build independent heat dissipation path, realize the efficient management of double heat source and the promotion of device detection precision, ceramic subassembly improves detection efficiency and stability.

Description

Technical Field

[0001] This utility model relates to the field of near-infrared grain quality detection technology, and in particular to a portable wheat moisture content detection device based on near-infrared fluorescent ceramics. Background Technology

[0002] Wheat, as an important staple crop, provides a variety of nutrients, including carbohydrates, proteins, and micronutrients. Its quality directly affects processing characteristics and nutritional value, thus necessitating the development of efficient detection methods. While traditional sensory evaluation and instrumental analysis offer a certain level of accuracy, they suffer from limitations such as strong subjectivity and sample destructiveness, making them unsuitable for practical applications. Near-infrared (NIR) spectroscopy, with its advantages of speed, non-destructive nature, and ease of operation, has become a reliable analytical tool in the agricultural and food sectors, widely used for the qualitative and quantitative analysis of wheat components. However, existing NIR equipment is bulky, severely restricting its field application; therefore, the development of portable detectors is urgently needed.

[0003] Invention Patent CN119880800A: Employs a semiconductor cooling chip (TEC) in conjunction with a temperature sensor and PID algorithm to maintain the detection area at a constant temperature of 27°C to suppress thermal noise; a double convex lens collimates the divergent light into parallel light and focuses it; after the spectrometer collects the signal, the processing system performs data analysis and display. Invention Patent CN106706556A: Uses an LED light source with a semi-transparent mirror to form a sample / reference dual channel; symmetrically arranged detectors collect diffuse reflection signals within the closed optical path. Invention Patent CN106706557A: Constructs a dual-channel contrast sampling system based on an LED light source, utilizing a standard reflective sphere to generate a uniform diffuse field. Invention Patent CN111812050A: Configured with a 360~2400nm halogen lamp light source; its core innovation lies in the modular interface design and portable hardware integration solution. Invention Patent CN117907228A: Employs a lifting worktable structure and modular sample management components. Invention Patent CN111189795B: Designs a ring-shaped LED array light source, where a photodetector directly receives the reflected light from the sample to replace a spectrometer; the embedded system generates and outputs a quality distribution map. Invention Patent CN112304896B: Integrates six broadband halogen lamp beads; the sample is transmitted through a quartz glass sample box, and a reflector focuses the light onto a fiber optic collimating lens; the embedded computer converts the light intensity values ​​collected by the spectrometer into absorbance, processes the data using an algorithm, and outputs the results on a display screen.

[0004] While the aforementioned patents reduce light source errors through multi-channel calibration and closed optical paths, they suffer from drawbacks such as light intensity attenuation, complex assembly and debugging, high cost, large size, and difficult maintenance. The composite hardware (TEC + lens + PID) introduced to improve thermal stability simultaneously increases system power consumption, size, cost, and maintenance difficulty. Although halogen lamp light sources can output a 2400nm spectrum to control costs, the spectrometer's detection limit of only 1032nm results in the ineffective acquisition of long-wavelength signals in the 1032-3400nm range, leading to a waste of spectral resources. While the lift-type structure improves adaptability to various scenarios, it does not fully address issues of measurement accuracy, mechanical stability, and thermal management. Although ring LED array light sources can achieve multi-angle illumination, their spectral range is limited to the visible-near-infrared band (400-1100 nm).

[0005] In conclusion, to solve the above problems, there is an urgent need for an innovative solution that can achieve high-precision and rapid detection while maintaining portability. Utility Model Content

[0006] To address the shortcomings in the aforementioned background technology, this utility model proposes a portable wheat moisture content detection device based on near-infrared fluorescent ceramics. This solves the contradiction between detection accuracy and portability in the prior art, and balances efficient thermal management, high-precision detection, and portable design, thereby promoting the application of fluorescent ceramics and the development of grain quality detection devices.

[0007] The technical solution of this utility model is implemented as follows: A portable wheat moisture content detection device based on near-infrared fluorescent ceramic includes a microcontroller and a shell. The shell has a circular heat dissipation fin for an excitation source inside its cavity. A lens assembly is located in the middle hole of the circular heat dissipation fin. An LD excitation source is located on the lens assembly. A rear cover for encapsulating the circular heat dissipation fin for the excitation source is installed at the rear of the shell. A ceramic assembly corresponding to the light-emitting side of the LD excitation source is detachably connected to the shell. The shell also has a ceramic conical heat dissipation fin inside its cavity. A focusing cup corresponding to the light-emitting side of the ceramic assembly is located inside the ceramic conical heat dissipation fin. A material box assembly is located at the front of the shell. A photosensitive component electrically connected to the microcontroller is located inside the material box assembly.

[0008] Furthermore, the material box assembly includes a material box, on which a high-transmittance baffle and a high-reflection baffle are detachably connected, and the material box forms a material cavity through the high-transmittance baffle and the high-reflection baffle.

[0009] In a further preferred embodiment, both the high-transmittance baffle and the high-reflection baffle are provided with a hand-held part and a functional part. After the functional part of the high-transmittance baffle and the high-reflection baffle are inserted and matched with the corresponding groove on the material box, the hand-held part of the high-transmittance baffle and the high-reflection baffle extends higher than the outer wall of the material box.

[0010] Furthermore, the photosensitive component includes an annular base, which is set at the light source inlet / outlet end of the material box and fixed to the material box by a high-transmittance baffle. The base is provided with an annular InGaAs groove, and several arrayed InGaAs sensors corresponding to the high-reflectivity baffle are arranged circumferentially inside the InGaAs groove.

[0011] More preferably, the cone angle inside the ceramic conical heat dissipation fin is 25~35°, and the ceramic conical heat dissipation fin includes right-angled trapezoidal fins evenly arranged in the circumference, the number of right-angled trapezoidal fins is 30~42, and the thickness of the right-angled trapezoidal fins is 0.5~1.5mm.

[0012] Furthermore, the ceramic component includes a ceramic substrate with stepped holes, and a near-infrared fluorescent ceramic sheet corresponding to the LD excitation source is installed in the stepped holes.

[0013] In a further preferred embodiment, the circular heat dissipation fins of the excitation source include rectangular fins evenly arranged circumferentially, with the number of rectangular fins being 30 to 42.

[0014] Furthermore, the lens includes a lens mount, a convex lens is provided inside the lens mount, and a lens cover for fixing the convex lens is installed on the lens mount.

[0015] Furthermore, the outer casing includes an outer casing body, which has a buckle that engages with a slot on the material box assembly, and a slot that engages with the ceramic assembly. The lower part of the outer casing body has an electrical compartment for mounting the microcontroller, and the upper cover of the electrical compartment has an electrical cover for fixing the microcontroller.

[0016] In a further preferred embodiment, the microcontroller is electrically connected to a battery and an LCD display. The battery is installed in the battery compartment of the main body of the casing, and the battery compartment is provided with a battery cover for protecting the battery. The LCD display is installed on the electrical compartment, and the microcontroller is electrically connected to a switch button and a detection button provided on the main body of the casing.

[0017] The beneficial effects of this utility model are as follows: 1. This device features a sealed sample chamber: a high-transmittance baffle near the outer casing blocks stray ambient light, while a high-reflectivity baffle at the other end guides the light beam into the sample. This baffle employs a pull-out design for quick sample changing and maintenance.

[0018] 2. The InGaAs array photosensitive sensor is used to replace the traditional bulky spectrometer, which reduces the size of the device by 80% while extending the spectral response to the 2400nm band, avoiding the waste of long-wavelength signals and improving the signal-to-noise ratio by 40%.

[0019] 3. This device uses an LD excitation source to excite a near-infrared fluorescent ceramic sheet to generate broadband near-infrared light (covering up to 2400nm), supporting rapid switching of the near-infrared fluorescent ceramic light source to adapt to the detection needs of different samples (such as wheat and flour). It replaces traditional halogen lamps or LED light sources, avoiding the problems of light source curing and long-wavelength (above 1032nm) signal loss.

[0020] 4. The light source area achieves efficient thermal management (ΔT≤2℃) through close coupling between near-infrared fluorescent ceramic and heat dissipation fins, effectively suppressing thermally induced spectral drift, stabilizing moisture characteristic peaks, and thus significantly improving the system signal-to-noise ratio.

[0021] 5. This device can trigger the microcontroller to automatically perform dark background correction, spectral acquisition, and real-time result display functions with a single button operation, without the need for professional personnel to operate it, which can effectively promote the development of grain quality testing technology. Attached Figure Description

[0022] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an exploded view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the material box assembly of this utility model; Figure 4 This is a schematic diagram of the structure of the photosensitive component of this utility model; Figure 5 This is a schematic diagram of the structure of the outer shell of this utility model; Figure 6 This is a schematic diagram of the structure of the ceramic component of this utility model; Figure 7 This is a schematic diagram of the lens assembly of this utility model.

[0024] In the diagram: 1. Material box assembly; 1-1. Material box; 1-2. High-transmittance baffle groove; 1-3. High-reflectance baffle groove; 1-4. High-transmittance baffle; 1-5. High-reflectance baffle; 2. Photosensitive component; 2-1. Annular base; 2-2. InGaAs groove; 2-3. Arrayed InGaAs sensor; 3. Concentrator cup; 4. Ceramic conical heat dissipation fins; 5. Electrical cover; 6. Microcontroller; 7. LCD display; 8. Battery cover; 9. Battery; 10. Housing; 10-1. Housing body; 10-2. Card slot; 10-3. Card... 10-4. Electrical compartment; 10-5. Switch button; 10-6. Detection button; 10-7. Battery compartment; 11. Ceramic assembly; 11-1. Near-infrared fluorescent ceramic sheet; 11-2. Ceramic substrate; 12. Circular heat dissipation fins for excitation source; 13. Lens assembly; 13-1. Lens cover; 13-2. Convex lens; 13-3. Lens mount; 14. LD excitation source; 15. Back cover; 16. GB / T65-2000 slotted cylindrical head screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1 and Figure 2As shown in Embodiment 1, a portable wheat moisture content detection device based on near-infrared fluorescent ceramic includes a microcontroller 6 and a housing 10. The housing 10 has a circular heat dissipation fin 12 for an excitation source inside its cavity. A lens assembly 13 is located in the central hole of the circular heat dissipation fin 12, and an LD excitation source 14 is mounted on the lens assembly 13. A rear cover 15 for encapsulating the circular heat dissipation fin 12 is installed at the rear of the housing 10. A ceramic assembly 11 corresponding to the light-emitting side of the LD excitation source 14 is detachably connected to the housing 10. A ceramic conical heat dissipation fin 4 is also located inside the housing 10, and a focusing cup 3 corresponding to the light-emitting side of the ceramic assembly 11 is located inside the ceramic conical heat dissipation fin 4. A material box assembly 1 is located at the front of the housing 10, and a photosensitive component 2 for receiving detected reflected light is located inside the material box assembly 1. The photosensitive component 2 is electrically connected to the microcontroller 6. The ceramic component 11 is located between the ceramic conical heat dissipation fin 4 and the excitation source circular heat dissipation fin 12, and the ceramic component 11 and the excitation source circular heat dissipation fin 12 are isolated by the outer shell 10, respectively constructing independent heat dissipation paths to achieve efficient management of the dual heat sources and improve the detection accuracy of the device. The ceramic component 11 is detachably mounted on the outer shell 10, allowing for targeted installation of near-infrared fluorescent ceramics according to different detection indicators, thereby improving detection efficiency and stability. The material box component 1, as a closed sample chamber, enables non-destructive testing, is easy to operate, and is highly portable.

[0027] Specifically, the sample to be tested is placed in the material box 1-1, and the device is started. The light emitted from the LD excitation source 14 passes through the lens assembly 13, the ceramic assembly 11, and the condenser cup 3 before being directed towards the material box 1-1. After passing through the wheat moisture in the material box 1-1, the light source transmits the detected reflected light to the photosensitive component 2. The photosensitive component 2, acting as a light signal receiver, transmits the detection signal to the microcontroller 6 to detect the wheat moisture content. The detection process is simple. During this process, the heat generated by the LD excitation source 14 is transferred to the circular heat dissipation fins 12 of the excitation source through the lens assembly 13 for heat dissipation, and the heat from the ceramic assembly 11 is dissipated through the ceramic conical heat dissipation fins 4, resulting in good heat dissipation and stable light source.

[0028] like Figure 1 and Figure 2As shown in Embodiment 2, a portable wheat moisture content detection device based on near-infrared fluorescent ceramics is provided. The material box assembly 1 includes a material box 1-1. A high-transmittance baffle 1-4 and a high-reflectance baffle 1-5 are detachably connected to the material box 1-1. The high-transmittance baffle 1-4 is located on the side closer to the outer shell 10, and the high-reflectance baffle 1-5 is located on the side away from the outer shell 10. The material box 1-1 forms a material cavity through the high-transmittance baffle 1-4 and the high-reflectance baffle 1-5. Both the high-transmittance baffle 1-4 and the high-reflectance baffle 1-5 are provided with a handle and a functional part. After the functional parts of the high-transmittance baffle 1-4 and the high-reflectance baffle 1-5 are inserted and engaged with the corresponding grooves 1-2 on the material box 1-1, the handles of the high-transmittance baffle 1-4 and the high-reflectance baffle 1-5 extend beyond the outer wall of the material box 1-1. The grooves on groove 1-2 correspond to a high-reflectivity baffle groove and a high-transmittance baffle groove, respectively. Both the high-transmittance baffle 1-4 and the high-reflectivity baffle 1-5 can be inserted into the material box 1-1, enabling the opening and closing of the material box 1-1 for easy placement of materials and replacement of the high-transmittance baffle 1-4 and the high-reflectivity baffle 1-5. A high-transmittance baffle is used near the material box 1-1 and the outer shell 10 to block stray ambient light, while a high-reflectivity baffle guides the light beam into the sample.

[0029] In this embodiment, the photosensitive component 2 includes an annular base 2-1. The inner diameter of the annular base 2-1 is greater than or equal to the maximum inner diameter of the focusing cup 3, facilitating the entry of the light source into the material box 1-1 and avoiding obstruction. The annular base 2-1 is located at the light source inlet / outlet end of the material box 1-1 and is fixed to the material box 1-1 by a high-transmittance baffle 1-4. The annular base 2-1 has an annular InGaAs groove 2-2, and several arrayed InGaAs sensors 2-3 corresponding to the high-reflectivity baffle 1-5 are arranged circumferentially inside the InGaAs groove 2-2. The arrayed InGaAs sensors 2-3 are indium gallium arsenide (IGaAs) array photosensitive sensors. Using IGaAs array photosensitive sensors to replace traditional bulky spectrometers reduces the device size by 80% while extending the spectral response to the 2400nm band, avoiding long-wavelength signal waste, and improving the signal-to-noise ratio by 40%. Preferably, the number of arrayed InGaAs sensors 2-3 is 8. The annular base 2-1 is an InGaAs base, and the annular groove 1-2 is an InGaAs groove.

[0030] All other structures are the same as in Example 1.

[0031] like Figure 1 and Figure 2As shown in Example 3, a portable wheat moisture content detection device based on near-infrared fluorescent ceramic is described. The conical angle within the ceramic conical heat dissipation fin 4 is 25-35°, preferably 30°. The ceramic conical heat dissipation fin 4 includes circumferentially uniformly arranged right-angled trapezoidal fins, with 30-42 right-angled trapezoidal fins, preferably 36, and a fin thickness of 0.5-1.5 mm. The ceramic component 11 includes a ceramic substrate 11-2 with stepped holes. Near-infrared fluorescent ceramic sheets 11-1 corresponding to the LD excitation source 14 are installed within the stepped holes. The circular heat dissipation fin 12 of the excitation source includes circumferentially uniformly arranged rectangular fins, with 30-42 rectangular fins, preferably 36.

[0032] In this embodiment, the lens includes a lens mount 13-3, within which a convex lens 13-2 is housed. A lens cover 13-1 for fixing the convex lens 13-2 is mounted on the lens mount 13-3. The lens mount 13-3 and the lens cover 13-1 are interlocked, facilitating the installation of the convex lens 13-2 and also allowing for easy replacement of the convex lens 13-2 according to the LD excitation source 14. The LD excitation source 14 is mounted on the lens mount 13-3, with its light source emission end corresponding to the convex lens 13-2. The heat from the LD excitation source 14 is transferred to the circular heat dissipation fins 12 of the excitation source through the lens mount 13-3 for heat dissipation, ensuring the stability of the light source of the LD excitation source 14.

[0033] All other structures are the same as in Example 2.

[0034] like Figure 1 and Figure 2 As shown in Embodiment 4, a portable wheat moisture content detection device based on near-infrared fluorescent ceramics includes a housing 10 comprising a housing body 10-1. The housing body 10-1 has a buckle 10-3 that engages with a groove on a material box assembly 1. The buckle 10-3 has an L-shaped structure, and the groove is an L-shaped recess 1-2. The buckle 10-3 engages with the groove on the material box 1-1, enabling the material box assembly 1 to be mounted on the housing body 10-1. The housing body 10-1 also has a groove 10-2 that engages with a ceramic component 11. The ceramic component 11 engages with the groove 10-2 on the housing 10, facilitating the installation and replacement of the ceramic component 11. Preferably, the housing body 10-1 has an arc-shaped groove that engages with the groove 10-2, facilitating the installation and removal of the ceramic component 11. The lower part of the housing body 10-1 has an electrical compartment 10-4 for mounting a microcontroller 6, and the electrical compartment 10-4 is covered with an electrical cover 5 for fixing the microcontroller 6. The lower part of the outer shell 10-1 is the handheld structure of the device. The electrical compartment 10-4 is located above the handheld structure, which facilitates the electrical connection between the microcontroller 6 and the LD excitation source 14 and the photosensitive component 2. The electrical cover 5 is used to protect the microcontroller 6.

[0035] In this embodiment, the microcontroller 6 is electrically connected to a battery 9 and an LCD display 7. The battery 9 is installed in the battery compartment 10-7 of the main body 10-1, which is located at the lower part of the handheld structure. The battery compartment 10-7 is provided with a battery cover 8 to protect the battery 9. The LCD display 7 is installed on the electrical compartment 10-4. The microcontroller 6 is electrically connected to a switch button 10-5 and a detection button 10-6 provided on the main body 10-1. The battery 9 powers the LD light source and the microcontroller 6. The microcontroller 6 can process the signals from the array InGaAs sensors 2-3 and display them on the LCD display 7.

[0036] All other structures are the same as in Example 3.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in Example 5, a portable wheat moisture content detection device based on near-infrared fluorescent ceramic includes a shell 10. The right cavity inside the shell 10 is provided with a circular heat dissipation fin 12 for an excitation source. A lens assembly 13 is installed in the central through hole of the circular heat dissipation fin 12. An LD excitation source 14 is installed at the end of the lens assembly 13. The rear cover 15 is connected to the shell 10 by screws 16 and fixes the circular heat dissipation fin 12, the lens assembly 13 and the LD excitation source 14. The heat from the LD excitation source 14 is conducted to the lens assembly 13 and then to the circular heat dissipation fin 12 for the excitation source. The outer casing 10 has a ceramic component slot 10-2 in the middle to install the ceramic component 11. The left cavity inside the outer casing 10 has a ceramic conical heat dissipation fin 4, the right end of which contacts the ceramic component 11. A focusing cup 3 is installed on the inner conical surface of the focusing cup 3. A photosensitive component 2 is installed on the left end of the flange of the focusing cup 3. The material box assembly 1 is installed on the left end of the outer casing 10 via a clip 10-3, which also secures the photosensitive component 2, the focusing cup 3, and the ceramic conical heat dissipation fin 4. The right end of the ceramic conical heat dissipation fin 4 is in close contact with the ceramic component 11. The heat generated by the excitation of the near-infrared fluorescent ceramic sheet 11-1 is transferred to the ceramic substrate 11-2 and the ceramic conical heat dissipation fin 4 via heat transfer. The electrical compartment 10-4 at the bottom of the outer casing 10 houses the LCD display 7 and the microcontroller 6. An electrical cover 5 is installed on the outer casing 10 to seal and protect the electrical components. The battery compartment 10-7 is located at the bottom of the outer casing 10, and a battery cover 8 protects the battery 9. The handheld part of the outer casing also has a device switch button 10-5 and a detection button 10-6.

[0038] In this embodiment, the axial length of the circular heat sink fins of the excitation source is 28 mm, the thickness of the circular heat sink fins of the excitation source is 1.0 mm, and the number of circular heat sink fins is 36. The cone angle of the ceramic conical heat sink fins is 30°, the axial length of the ceramic conical heat sink fins is 30 mm, the thickness of the ceramic conical heat sink fins is 1.0 mm, and the number of ceramic conical heat sink fins is 36. The InGaAs photosensitive sensors are distributed in a circumferential array in the InGaAs grooves, and the number of InGaAs sensors is 8. This design improves detection efficiency and stability by using a quick-release ceramic component 11 to install near-infrared fluorescent ceramics according to different detection indicators. The LD excitation source 14 and the ceramic component 11 are arranged separately on the left and right sides, respectively constructing independent heat dissipation paths, realizing efficient management of dual heat sources and improving device detection accuracy.

[0039] The material box assembly 1 is installed on the left end of the outer shell 10 via a clip 10-3, and the photosensitive component 2, the condenser cup 3, and the ceramic conical heat sink 4 are fixed therein. The right end of the ceramic conical heat sink 4 is in close contact with the ceramic component 11. The heat generated by the excitation of the near-infrared fluorescent ceramic sheet 11-1 is transferred to the ceramic substrate 11-2 and the ceramic conical heat sink 4 in the form of heat transfer. The photosensitive component 2 is clamped and fixed by the outer shell 10 and the material box assembly 1. The photosensitive component includes an InGaAs base 2-1. An optical path through hole is provided in the center of the InGaAs base 2-1. The diameter of the optical path through hole is 30mm, which is not less than the diameter of the large end of the inner conical surface of the condenser cup. There are InGaAs grooves 2-3 around the circumference of the InGaAs base. The InGaAs photosensitive sensors 2-3 are distributed in a circumferential array in the InGaAs grooves 2-3, with a quantity of 6. The material box assembly 1 is connected to the outer shell 10 via the outer shell buckle 10-3. The material box assembly 1 includes a material box 1-1. The material box 1-1 has baffle slots 1-2 / 1-3 at both ends. The high-transmittance baffle 1-4 at the end adjacent to the outer shell is made of cyclic olefin polymer (COP / COC), polymethyl methacrylate (PMMA) or other materials with high transmittance, high thermal stability and low water absorption. The high-reflectance baffle 1-5 at the other end is made of polyphenylene sulfide (PPS+GF / mineral), liquid crystal polymer (LCP+mineral filler) or other materials with high reflectance (opaque), high thermal stability and low water absorption. The device opens / closes the material box 1-1 by pulling out the high-reflectance baffle 1-5 to realize the placement and replacement of test samples.

[0040] In this embodiment, the axial length of the circular heat sink fins of the excitation source is 16 mm, the thickness of the circular heat sink fins of the excitation source is 2.0 mm, and the number of circular heat sink fins of the excitation source is 24. The cone angle of the ceramic conical heat sink fins is 36°, the axial length of the ceramic conical heat sink fins is 20 mm, the thickness of the ceramic conical heat sink fins is 2.0 mm, and the number of ceramic conical heat sink fins is 24. The InGaAs photosensitive sensors are distributed in a circumferential array in the InGaAs grooves, and the number of them is 6.

[0041] This design uses a material box that can be opened / closed by a pull-out baffle. The high-transmittance baffle ensures that the sample is illuminated by near-infrared light. At the same time, the arrayed InGaAs structure can efficiently receive the near-infrared diffuse reflectance spectrum. The high-reflectance baffle can eliminate the influence of environmental noise on the detection results, which greatly enhances the signal-to-noise ratio and improves the accuracy and robustness of the detection device. It solves the technical problems of low detection efficiency and poor detection accuracy caused by environmental factors in portable device detection.

[0042] The right cavity inside the outer casing 10 houses a circular heat dissipation fin 12 for the excitation source. A lens assembly 13 is fixed in the central through hole of the heat dissipation fin, and the end of the lens assembly 13 is connected to the LD excitation source 14. The rear cover 15 is fastened to the outer casing 10 with screws 16, simultaneously fixing the heat dissipation fin 12, the lens assembly 13, and the LD excitation source 14. A ceramic component 11 is embedded in the ceramic component slot 10-2 in the middle of the outer casing 10. A ceramic conical heat dissipation fin 4 is provided in the left cavity, with its right end tightly attached to the ceramic component 11. A condenser cup 3 is mounted on the inner conical surface, and a photosensitive component 2 is installed on the left end of the flange face of the condenser cup 3. The left end of the outer casing 10 is connected to the material box assembly 1 via a buckle 10-3, simultaneously pressing the photosensitive component 2, the condenser cup 3, and the ceramic conical heat dissipation fin 4. The electrical compartment 10-4 at the bottom of the outer casing 10 integrates a microcontroller 6 and an LCD display 7. An electrical cover 5 seals the electrical compartment. A battery compartment 10-7 houses a battery 9. A switch button 10-5 and a detection button 10-6 are provided on the handheld part.

[0043] In this embodiment, the axial length of the circular heat dissipation fins 12 of the excitation source is optimized to 22 mm, the thickness to 1.5 mm, and the number to 30. The cone angle of the ceramic conical heat dissipation fins 4 is set to 33°, the axial length to 25 mm, the thickness to 1.5 mm, and the number to 30. The dual heat dissipation path ensures that the temperature rise ΔT ≤ 2℃. The photosensitive component 2 uses six circumferentially distributed InGaAs sensors 2-3, with the light-transmitting aperture maintained at 30 mm to match the large end diameter of the condenser cup 3. By optimizing the sensor layout and gain algorithm, the effective acquisition of long-wavelength 2400 nm signals is maintained while reducing the number of hardware components.

[0044] The material box assembly 1 is equipped with high-transmittance baffles 1-4 and high-reflectance baffles 1-5 at both ends. The transmittance baffles are made of PMMA material (transmittance ≥92%), and the reflectance baffles are made of LCP + mineral filler (reflectance >95%). Pulling out the high-reflectance baffles 1-5 enables rapid sample changing. The closed double-baffle structure suppresses stray light from the environment. Combined with the optimized signal-to-noise ratio design of the 4-sensor array, the signal-to-noise ratio is still improved by 30% compared to traditional equipment. After a single press of the detection button 10-6, the microcontroller 6 automatically performs dark background correction, spectral acquisition, and PLS analysis, and the moisture value is output to the LCD display 7 in real time. The overall size of the device is maintained at a compact design of 180 mm × 90 mm × 60 mm. The sensor array significantly reduces hardware costs while ensuring a long-wavelength capture capability of 2400 nm. The compromise heat dissipation parameters and the closed optical path of the double baffles work together to maintain high-precision thermal management and environmental anti-interference. The single-button operation and rapid sample changing mechanism meet the needs of high-frequency field detection, and the moisture measurement accuracy reaches ±0.8%.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable wheat moisture content detection device based on near-infrared fluorescent ceramics, comprising a microcontroller (6), characterized in that: It also includes a housing (10), in which a circular heat dissipation fin (12) for excitation source is provided in the cavity of the housing (10), a lens assembly (13) is provided in the middle hole of the circular heat dissipation fin (12), an LD excitation source (14) is provided on the lens assembly (13), a rear cover (15) for encapsulating the circular heat dissipation fin (12) for excitation source is installed at the tail of the housing (10), a ceramic assembly (11) corresponding to the light-emitting side of the LD excitation source (14) is detachably connected to the housing (10), a ceramic conical heat dissipation fin (4) is also provided in the cavity of the housing (10), a light-concentrating cup (3) corresponding to the light-emitting side of the ceramic assembly (11) is provided in the ceramic conical heat dissipation fin (4), a material box assembly (1) is provided at the front end of the housing (10), and a photosensitive assembly (2) electrically connected to the microcontroller (6) is provided in the material box assembly (1).

2. The portable wheat moisture content detection device based on near-infrared fluorescent ceramics according to claim 1, characterized in that: The material box assembly (1) includes a material box (1-1), on which a high-transmittance baffle (1-4) and a high-reflection baffle are detachably connected, and the material box (1-1) forms a material cavity through the high-transmittance baffle (1-4) and the high-reflection baffle (1-5).

3. The portable wheat moisture content detection device based on near-infrared fluorescent ceramics according to claim 2, characterized in that: Both the high-transmittance baffle (1-4) and the high-reflection baffle (1-5) are provided with a handhold and a functional part. After the functional parts of the high-transmittance baffle (1-4) and the high-reflection baffle (1-5) are inserted and matched with the corresponding grooves (1-2) on the material box (1-1), the handholds of the high-transmittance baffle (1-4) and the high-reflection baffle (1-5) extend higher than the outer wall of the material box (1-1).

4. The portable wheat moisture content detection device based on near-infrared fluorescent ceramic according to any one of claims 1 to 3, characterized in that: The photosensitive component (2) includes an annular base (2-1), which is located at the light source inlet / outlet of the material box (1-1) and fixed to the material box (1-1) by a high-transmittance baffle (1-4). The annular base (2-1) is provided with an annular InGaAs groove (2-2), and several arrays of InGaAs sensors (2-3) corresponding to the high-reflectivity baffle (1-5) are arranged in the inner circumference of the InGaAs groove (2-2).

5. The portable wheat moisture content detection device based on near-infrared fluorescent ceramics according to claim 4, characterized in that: The conical angle inside the ceramic conical heat dissipation fin (4) is 25~35°. The ceramic conical heat dissipation fin (4) includes right-angled trapezoidal fins evenly arranged in the circumference. The number of right-angled trapezoidal fins is 30~42, and the thickness of the right-angled trapezoidal fins is 0.5~1.5mm.

6. The portable wheat moisture content detection device based on near-infrared fluorescent ceramic according to any one of claims 1 to 3 and 5, characterized in that: The ceramic component (11) includes a ceramic substrate (11-2), on which a stepped hole is provided, and a near-infrared fluorescent ceramic sheet (11-1) corresponding to the LD excitation source (14) is installed in the stepped hole.

7. The portable wheat moisture content detection device based on near-infrared fluorescent ceramics according to claim 6, characterized in that: The excitation source circular heat dissipation fin (12) includes rectangular fins evenly arranged in the circumference, with a number of 30 to 42 rectangular fins.

8. The portable wheat moisture content detection device based on near-infrared fluorescent ceramic according to any one of claims 1 to 3, 5, and 7, characterized in that: The lens includes a lens mount (13-3), a convex lens (13-2) is provided inside the lens mount (13-3), and a lens cover (13-1) for fixing the convex lens (13-2) is installed on the lens mount (13-3).

9. The portable wheat moisture content detection device based on near-infrared fluorescent ceramic according to any one of claims 1 to 3, 5, and 7, characterized in that: The outer casing (10) includes an outer casing body (10-1), on which a buckle (10-3) is provided to engage with a buckle groove on the material box assembly (1), and on which a slot (10-2) is provided to engage with the ceramic assembly (11). The lower part of the outer casing body (10-1) is provided with an electrical compartment (10-4) for installing the microcontroller (6), and the electrical compartment (10-4) is covered with an electrical cover (5) for fixing the microcontroller (6).

10. The portable wheat moisture content detection device based on near-infrared fluorescent ceramics according to claim 9, characterized in that: The microcontroller (6) is powered on and connected to a battery (9) and an LCD display (7). The battery (9) is installed in the battery compartment (10-7) of the main body (10-1). The battery compartment (10-7) is provided with a battery cover (8) to protect the battery (9). The LCD display (7) is installed on the electrical compartment (10-4). The microcontroller (6) is electrically connected to the switch button (10-5) and the detection button (10-6) provided on the main body (10-1).

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