Diffuse reflection spectrum measuring device and method for oil content of peanut seeds

Abstract

The invention relates to the technical field of agricultural product detection, in particular to a diffuse reflection spectrum measuring device and method for the oil content of peanut seeds, the diffuse reflection spectrum measuring device comprises a main machine, light-guide fibers and a probe, the detection end of the probe is sleeved with a guide cylinder, a guide groove is formed in the bottom of the guide cylinder, a sliding assembly is in sliding fit in the guide groove, and a placing cover is detachably connected to the bottom of the sliding assembly; a placing table is fixedly connected to the bottom in the placing cover, and a placing groove for placing peanut seeds is formed in the top of the placing table. Accurate alignment and stable attachment of peanut seeds and the probe are achieved through cooperation of the guide cylinder and the sliding assembly, the seeds are positioned and limited through the containing groove, external natural light interference is effectively isolated, natural light is prevented from being mixed into diffuse reflection light signals, and the near-infrared characteristic light purity is prevented from being damaged. The recognition accuracy of the characteristic absorption peak of the grease C-H functional group is ensured; meanwhile, lossless positioning detection of the peanut seeds is achieved, operation is convenient, and the method is suitable for fields, purchasing sites and other scenes.

Description

Technical Field

[0001] This invention relates to the field of agricultural product testing technology, specifically to a device and method for determining the diffuse reflectance spectroscopy of oil content in peanut seeds. Background Technology

[0002] Peanuts are an important oilseed and economic crop in my country, possessing dual value for both food and oil production. The oil content in the kernels is a core indicator for evaluating peanut quality and economic value. With technological advancements, near-infrared diffuse reflectance spectroscopy has gradually become the mainstream technique for detecting oil content in peanut seeds. This technique is based on the near-infrared characteristic absorption principle of functional groups in molecules. The CH functional group in triglycerides, the core component of peanut oil, exhibits a specific absorption peak in the near-infrared band of 780nm–2500nm. By detecting the absorption intensity of the diffuse reflectance light signal and combining it with a chemometric quantitative model, the oil content can be rapidly calculated. This technique offers advantages such as fast detection speed, no need for chemical reagents, and convenient operation, while also achieving non-destructive testing, meeting the core needs of peanut seed testing.

[0003] Currently, several mature devices have incorporated this technology for non-destructive testing of oil content in peanut seeds. For example, the MPI III Bruker near-infrared spectrometer is equipped with a dedicated handheld probe. During testing, no pretreatment of the peanut seeds is required; the probe is simply pointed at the area to be tested to complete spectral acquisition and oil content determination, significantly simplifying the operation process and improving testing efficiency. This makes it suitable for scenarios such as field breeding screening and rapid on-site testing at the harvesting site. However, these handheld portable testing solutions prioritize ease of operation and scenario adaptability, generally without strict restrictions on the testing environment. They are susceptible to interference from natural light during testing. External natural light can mix into the diffuse reflection light signal acquired by the probe, destroying the purity of the near-infrared characteristic light signal, interfering with the identification and signal intensity determination of the characteristic absorption peaks of the CH functional groups in the oil, leading to spectral baseline drift and characteristic peak distortion, ultimately causing deviations in the oil content measurement results and affecting the testing accuracy.

[0004] Therefore, this invention proposes a device and method for determining the diffuse reflectance spectroscopy of peanut seed oil content to solve the above problems. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a device and method for determining the diffuse reflectance spectroscopy of peanut seed oil content. This device is used for the non-destructive and accurate determination of peanut seed oil content, and is suitable for scenarios such as field breeding screening and rapid on-site testing. By achieving precise alignment between the seed and the probe and isolating the seed from natural light, external light interference is avoided, thereby improving the detection accuracy and reliability of the results.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A diffuse reflectance spectrometer for measuring the oil content of peanut seeds includes a main unit, an optical fiber, and a probe. The two ends of the optical fiber are connected to the main unit and the probe, respectively. A guide tube is sleeved on the detection end of the probe. A guide groove is opened at the bottom of the guide tube. A sliding component is slidably fitted in the guide groove. The bottom of the sliding component is detachably connected to a cover. A placement platform is fixedly connected to the bottom of the cover. A placement groove for placing peanut seeds is opened at the top of the placement platform.

[0007] The technical principle of the above scheme is as follows: This device uses a guide tube and a placement cover to form a closed detection space, reducing the amount of natural light entering the detection area and preventing the mixing of diffuse reflection light signals with natural light from damaging the purity of near-infrared characteristic light. On the other hand, the sliding component and the sliding groove can be used to smoothly move the placement cover and the peanut seeds in the placement groove closer to the probe detection end, achieving precise alignment and uniform contact between the seed detection surface and the probe, ensuring the stability of near-infrared light irradiation. During detection, the 780nm~2500nm near-infrared light emitted by the host is transmitted to the probe via optical fiber. The near-infrared light emitted by the probe accurately irradiates the peanut seed detection surface positioned in the placement groove. The light penetrates the seed coat and interacts with the cotyledon oil molecules to produce diffuse reflection. The reflected light signal is collected by the probe and transmitted back to the host via optical fiber. The host performs analysis and calculation based on the correlation model between the characteristic absorption peak of the CH functional group of oil and oil content, ultimately achieving accurate and non-destructive determination of the oil content of peanut seeds.

[0008] The above-mentioned solution offers the following advantages: This solution, through the closed detection space formed by the guide tube and the placement cover, effectively isolates external stray light, ensuring the purity of the near-infrared characteristic light signal, avoiding baseline drift and characteristic peak distortion, and significantly improving the accuracy of oil content determination. Simultaneously, the cooperation between the sliding component and the guide groove ensures precise alignment and uniform contact between the seed and the probe, reducing signal fluctuations caused by positioning deviations and ensuring repeatability. The device has a simple structure and is easy to operate. The placement cover is removable for easy cleaning and batch testing, and it achieves non-destructive seed testing, adapting to various scenarios such as field breeding and harvesting. It balances detection efficiency and practicality, providing reliable support for rapid and accurate detection of peanut oil content.

[0009] Furthermore, the sliding assembly includes a sliding collar and a rotating collar, both of which slide in contact with the inner wall of the guide groove; several springs are provided inside the guide groove, one end of each spring is fixedly connected to the top wall of the guide groove, and the other end of each spring is fixedly connected to the top of the sliding collar; the bottom of the sliding collar is slidably connected to the top of the rotating collar; the bottom of the rotating collar is detachably connected to the top of the placement cover.

[0010] Beneficial effects: The spring elastic support allows the sliding collar to slide smoothly, ensuring a flexible fit between the peanut seed and the probe. This guarantees a tight fit for stable light signal acquisition while preventing excessive pressure from damaging the seed, achieving non-destructive testing. The sliding engagement of the sliding and rotating collars allows for flexible adjustment of the placement cover angle to accommodate different optimal detection surfaces of the peanut seed, ensuring precise alignment with the probe and further improving detection accuracy. Simultaneously, the rotating collar and placement cover are detachable, facilitating disassembly, cleaning, and batch sample changes, thus improving testing efficiency.

[0011] Furthermore, the top of the cover is provided with several connecting seats, and the bottom of the rotating collar is provided with several docking holes corresponding to the connecting seats. The inner wall of each docking hole is provided with a magnetic layer, and the surface of each connecting seat is provided with an adsorption layer.

[0012] Beneficial effects: The connector and docking hole are precisely matched, and with the adsorption effect of the magnetic layer and adsorption layer, the placement cover and rotating collar can be quickly disassembled and assembled. The operation is convenient and efficient, greatly saving sample change time and adapting to the needs of batch peanut seed testing. At the same time, the magnetic connection is strong and stable, and there will be no loosening or displacement during the testing process, ensuring the stability of the seed testing position and avoiding testing deviations caused by loose connections. After disassembly and assembly, it is also convenient to clean and maintain the placement cover and placement platform, further improving testing efficiency and accuracy.

[0013] Furthermore, a layer of white porcelain is provided on the bottom wall of the placement tank.

[0014] Beneficial effects: The white porcelain layer has high near-infrared diffuse reflection characteristics, which can efficiently reflect the near-infrared light that penetrates the peanut seed but is not absorbed back into the seed, and interact with the oil molecules a second time, enhancing the intensity of the diffuse reflection light signal, improving the spectral signal-to-noise ratio and detection accuracy; moreover, the white porcelain has no characteristic absorption in the 780~2500nm detection band, which will not interfere with the characteristic signal of CH functional groups in oil and avoid introducing background errors.

[0015] Furthermore, the sliding collar is equipped with an adsorption component for absorbing dust from the placement slot.

[0016] Beneficial effects: The adsorption component can promptly remove residual dust and impurities from the placement slot and the surface of peanut seeds, preventing impurities from blocking light or interfering with diffuse reflection signals, ensuring the purity of near-infrared light penetration and signal acquisition, and effectively reducing detection errors; at the same time, it prevents dust from adhering to the probe and affecting detection accuracy, eliminating the need for frequent manual cleaning, simplifying the operation process, and improving batch detection efficiency and result stability.

[0017] Furthermore, the adsorption component includes several first channels, each of which is located within a sliding collar and is connected to a guide groove; several second channels are located within a rotating collar, each of which is connected to a first channel; several third channels are located inside the placement cover, each of which is connected to a second channel; several cleaning channels are located inside the placement platform and are connected to the placement groove, each of which is connected to a third channel one-to-one; the diameter of each third channel is larger than the diameter of the cleaning channel.

[0018] Beneficial effects: The multi-level channels are precisely connected in sequence to form a complete dust collection path, guiding the airflow in the slot through the first, second and third channels. When the airflow passes through one end of the cleaning channel, because the diameter of the third channel is larger than that of the cleaning channel, a pressure difference is formed at both ends of the cleaning channel based on Bernoulli's principle, which can efficiently remove dust and impurities from the slot.

[0019] Furthermore, the end of the cleaning channel furthest from the third channel is close to the bottom of the placement tank.

[0020] Beneficial effects: The cleaning channel port is close to the bottom of the placement slot, which can accurately target the gap between the peanut seeds and the placement slot, effectively removing hidden dust and impurities deposited at the bottom of the slot and the bottom of the seeds. The dust removal is more thorough and without dead corners, avoiding residual impurities from blocking light or interfering with diffuse reflection signals. At the same time, the dust removal close to the bottom will not disturb the seed placement position, ensuring the seed positioning is stable, further improving the purity of spectral signal acquisition, effectively reducing detection deviation, and ensuring accurate and reliable measurement results.

[0021] Furthermore, the diameter of the second channel is smaller than that of the third channel.

[0022] Beneficial effects: The diameter of the second channel is smaller than that of the third channel. When the airflow enters the third channel through the second channel, the pipe diameter increases sharply and the flow rate increases significantly. This reduces the pressure in the third channel, thereby significantly increasing the pressure difference between the two ends of the cleaning channel, improving the adsorption suction and dust removal efficiency. It can quickly remove residual dust and impurities from gaps in the placement tank, making dust removal more thorough and leaving no residue.

[0023] Furthermore, the surface of the lid is provided with anti-slip texture.

[0024] Beneficial effects: The anti-slip texture on the surface of the lid increases the friction between the hand and the object, making it less slippery during disassembly and assembly, enabling quick placement and replacement of the lid, and improving the efficiency of batch testing and sample changing.

[0025] Furthermore, a method for determining the diffuse reflectance spectroscopy content of peanut seed oil includes the following steps: Step 1: Place the pre-treated peanut seeds into the placement slot of the placement platform, and then connect the placement cover to the sliding component; Step 2: Push the sliding collar along the guide groove toward the probe detection end until the peanut seed is in close contact with the probe detection end; then transmit near-infrared light to the probe through the optical fiber, and irradiate the peanut seed detection surface with the near-infrared light emitted by the probe. The light signal after diffuse reflection inside the peanut seed is collected by the probe and then transmitted back to the host through the optical fiber to complete the acquisition and preliminary recording of the spectral signal. Step 3: The host preprocesses the acquired raw spectral signal and uses the preset near-infrared diffuse reflectance quantitative model for peanut oil content to analyze and calculate the preprocessed spectral signal, and outputs the oil content measurement result of peanut seeds. After the test is completed, the placement cover is pulled in the opposite direction to remove it from the sliding component, and the tested peanut seeds are taken out to wait for the next test.

[0026] Beneficial effects: Step one accurately positions and rapidly assembles the seeds, ensuring a stable foundation for testing; Step two achieves precise alignment between the seed and probe through sliding contact, resulting in stable and efficient spectral acquisition without damaging the seeds, thus meeting breeding and screening needs; Step three automates data processing and outputs results, ensuring efficient and accurate testing. The entire process requires no grinding pretreatment, shortening the testing cycle, adapting to batch testing, and effectively avoiding interference from natural light and impurities, improving the accuracy and repeatability of oil content determination, and providing reliable test results.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is an overall isometric view of an embodiment of the diffuse reflectance spectroscopy device for measuring the oil content of peanut seeds according to the present invention; Figure 2 for Figure 1 Enlarged view of section A; Figure 3 This is a front cross-sectional view of the sliding component and the placement cover of an embodiment of the diffuse reflectance spectroscopy measuring device for peanut seed oil content of the present invention; Figure 4 for Figure 3 Enlarged view of section B; Figure 5 for Figure 3 Enlarged view of section C; Figure 6 This is an axonometric view of the placement cover of an embodiment of the diffuse reflectance spectrometer for measuring the oil content of peanut seeds of the present invention; Figure 7 for Figure 6 Enlarged view of section D; Figure 8 This is a schematic flowchart of the method for determining the diffuse reflectance spectroscopy content of peanut seeds according to the present invention.

[0029] The reference numerals in the accompanying drawings of the instruction manual include: 1. Main unit; 101. Optical fiber; 102. Probe; 2. Guide tube; 201. Guide groove; 202. Spring; 3. Placement cover; 301. Placement stage; 302. Placement groove; 303. Third channel; 304. Cleaning channel; 305. Connecting seat; 4. Rotating collar; 401. Second channel; 5. Sliding collar; 501. First channel. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The following detailed description illustrates the specific implementation method: Example 1:

[0034] like Figure 1 , Figure 2 and Figure 6As shown, a diffuse reflectance spectrometer for measuring the oil content of peanut seeds includes a main unit 1, an optical fiber 101, and a probe 102. The two ends of the optical fiber 101 are connected to the main unit 1 and the probe 102, respectively. The main unit 1 can preferably be a Bruker near-infrared spectrometer of model MPI Ⅲ. A guide tube 2 is sleeved on the detection end of the probe 102. A guide groove 201 is formed at the bottom of the guide tube 2. A sliding collar 5 is slidably fitted inside the guide groove 201. A rotating collar 4, which slidably fits the inner wall of the guide groove 201, is slidably connected to the bottom of the sliding collar 5. Several springs 202 are arranged inside the guide groove 201. One end of each spring 202 is adhered to the top wall of the guide groove 201, and the other end of each spring 202 is adhered to the top of the sliding collar 5.

[0035] The bottom of the rotating collar 4 is detachably connected to a placement cover 3, the surface of which is provided with anti-slip texture. Specifically, the top of the placement cover 3 is provided with several connecting seats 305 (see reference). Figure 6 The bottom of the rotating collar 4 has several mating holes corresponding to the connecting seat 305. The inner wall of each mating hole is provided with a magnetic layer, and the surface of the connecting seat 305 is provided with an adsorption layer. The bottom of the placement cover 3 is integrally formed with a placement platform 301. The top of the placement platform 301 has a placement groove 302 for placing peanut seeds. The bottom wall of the placement groove 302 is provided with a white porcelain layer.

[0036] The specific implementation process is as follows: First, select plump, undamaged peanut seeds with intact seed coats as test samples. Gently clean the surface dust of the seeds with a soft brush to complete the pretreatment. Place the pretreated peanut seeds stably into the placement slot 302 of the placement platform 301, ensuring that the optimal detection surface with longitudinal symmetry in the middle of the seed is facing upwards. The bottom of the peanut seed should be in close contact with the white porcelain layer on the bottom wall of the placement slot 302. The high near-infrared diffuse reflectance characteristics of the white porcelain layer can lay the foundation for subsequent signal enhancement. Then, hold the placement cover 3 with anti-slip texture and align the connecting seat 305 at the top of the placement cover 3 with the docking hole at the bottom of the rotating collar 4. With the help of the magnetic attraction between the magnetic layer on the inner wall of the docking hole and the adsorption layer on the surface of the connecting seat 305, the placement cover 3 and the rotating collar 4 are quickly and securely docked.

[0037] Holding the guide tube 2, gently push the placement cover 3 towards the detection end of the probe 102, causing the peanut seeds in the placement groove 302 to gradually approach the detection end of the probe 102. Simultaneously, the sliding collar 5 and the rotating collar 4 slide smoothly along the guide groove 201. The spring 202 within the guide groove 201 contracts under pressure, and the elastic support of the spring 202 ensures a flexible fit between the seed and the probe 102. This guarantees close contact between the detection surface and the probe 102, preventing light signal scattering loss due to air gaps, and also prevents excessive pressure from damaging the seed, achieving non-destructive testing. If the detection angle needs adjustment, the placement cover 3 can be rotated, causing the peanut seeds in the placement groove 302 to rotate synchronously, ensuring the optimal detection surface of the seed is precisely aligned with the probe 102, further improving detection accuracy.

[0038] At this time, the guide tube 2 and the placement cover 3 work together to form a closed detection space, effectively isolating external natural light and preventing natural light from mixing with diffuse reflection light signals and damaging the purity of near-infrared characteristic light. The host 1 (MPI III Bruker near-infrared spectrometer) is started. The host 1 emits near-infrared light in the 780nm~2500nm band, which is transmitted to the probe 102 through the optical fiber 101. The near-infrared light emitted by the probe 102 accurately illuminates the seed detection surface. After the light penetrates the seed coat, it interacts with the oil molecules in the cotyledons. The unabsorbed light is efficiently reflected back into the seed through the white porcelain layer, interacting with the oil molecules a second time and enhancing the intensity of the diffuse reflection light signal. The reflected light signal is collected by the probe 102 and then transmitted back to the host 1 through the optical fiber 101 to complete the acquisition and preliminary recording of the spectral signal. The host 1 then analyzes the signal to obtain the corresponding oil content of the peanut seed.

[0039] Example 2:

[0040] The difference from Embodiment 1 is that this solution also includes an adsorption component inside the sliding collar 5 for absorbing dust from the placement groove 302. Specifically, as shown... Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, the adsorption assembly includes several first channels 501, each of which is disposed within a sliding collar 5 and communicates with a guide groove 201. A rotating collar 4 contains several second channels 401, each of which communicates with one of the first channels 501. A placement cover 3 contains several third channels 303, each of which communicates with one of the second channels 401. A placement platform 301 contains several cleaning channels 304 communicating with a placement groove 302, with each cleaning channel 304 communicating one-to-one with a third channel 303. The diameter of each third channel 303 is larger than the diameter of each cleaning channel 304 (e.g., the diameter of the third channel 303 is 2 to 3 times that of the cleaning channel 304), and the end of each cleaning channel 304 furthest from the third channel 303 is close to the bottom of the placement groove 302. Furthermore, the diameter of each second channel 401 is smaller than the diameter of each third channel 303.

[0041] The specific implementation process is as follows: When the sliding collar 5 slides upward (e.g., ... Figure 3As shown, the internal volume of the guide groove 201 decreases accordingly, and the internal gas is rapidly compressed to form a directional airflow. The airflow passes sequentially through the first channel 501 in the sliding collar 5, the second channel 401 in the rotating collar 4, and the third channel 303 in the placement cover 3. Because the diameter of the second channel 401 is smaller than that of the third channel 303, the airflow triggers the Venturi effect when it enters the third channel 303 through the second channel 401. The sudden increase in pipe diameter greatly increases the airflow velocity, and the air pressure in the third channel 303 decreases. Furthermore, the diameter of the third channel 303 is larger than that of the cleaning channel 304, further increasing the pressure difference between the two ends of the cleaning channel 304, thereby generating a strong adsorption force. In addition, the end of the cleaning channel 304 away from the third channel 303 is close to the bottom of the placement groove 302, which can accurately adsorb floating dust, residual impurities on the surface of peanut seeds, and hidden dust in the gap between the seeds and the bottom of the groove in the placement groove 302, reducing the interference of dust with diffuse reflection signals.

[0042] Example 3:

[0043] As attached Figure 8 As shown, a method for determining the diffuse reflectance spectroscopy content of peanut seeds, based on the content described in Examples 1 and 2, includes the following steps: Step 1: Place the pre-treated peanut seeds into the placement slot 302 of the placement platform 301, and then align the connecting seat 305 at the top of the placement cover 3 with the docking hole at the bottom of the rotating collar 4. With the help of the magnetic attraction between the magnetic layer on the inner wall of the docking hole and the adsorption layer on the surface of the connecting seat 305, the placement cover 3 and the rotating collar 4 are quickly and securely docked. Step 2: Push the sliding collar 5 along the guide groove 201 toward the detection end of the probe 102 until the peanut seed is in close contact with the detection end of the probe 102; then transmit near-infrared light to the probe 102 through the optical fiber 101, and irradiate the detection surface of the peanut seed with the near-infrared light emitted by the probe 102. The light signal after diffuse reflection inside the peanut seed is collected by the probe 102 and then transmitted back to the host 1 through the optical fiber 101 to complete the acquisition and preliminary recording of the spectral signal. Step 3: The host 1 preprocesses the acquired raw spectral signal and uses the preset near-infrared diffuse reflectance quantitative model for peanut oil content (the analysis model of the existing MPI III Bruker near-infrared spectrometer, which will not be described in detail) to analyze and calculate the preprocessed spectral signal and output the oil content measurement result of peanut seeds. After the detection is completed, the placement cover 3 is pulled in the opposite direction to remove it from the rotating collar 4, and the tested peanut seeds are taken out to wait for the next detection.

[0044] For batch testing, simply repeat steps one through three.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A diffuse reflectance spectrometer for measuring the oil content of peanut seeds, comprising a main unit (1), an optical fiber (101), and a probe (102), wherein the two ends of the optical fiber (101) are respectively connected to the main unit (1) and the probe (102), characterized in that, The probe (102) is fitted with a guide tube (2) at the detection end. A guide groove (201) is opened at the bottom of the guide tube (2). A sliding component is slidably fitted inside the guide groove (201). A placement cover (3) is detachably connected to the bottom of the sliding component. A placement platform (301) is fixedly connected to the bottom of the placement cover (3). A placement groove (302) for placing peanut seeds is opened at the top of the placement platform (301).

2. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 1, characterized in that, The sliding assembly includes a sliding collar (5) and a rotating collar (4), both of which slide in cooperation with the inner wall of the guide groove (201); a number of springs (202) are provided in the guide groove (201), one end of each spring (202) is fixedly connected to the top wall of the guide groove (201), and the other end of each spring (202) is fixedly connected to the top of the sliding collar (5); the bottom of the sliding collar (5) is slidably connected to the top of the rotating collar (4); the bottom of the rotating collar (4) is detachably connected to the top of the cover (3).

3. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 2, characterized in that, The top of the cover (3) is provided with several connecting seats (305), and the bottom of the rotating collar (4) is provided with several docking holes corresponding to the connecting seats (305). The inner wall of the docking holes is provided with a magnetic layer, and the surface of the connecting seats (305) is provided with an adsorption layer.

4. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 3, characterized in that, The bottom wall of the placement trough (302) is provided with a white porcelain layer.

5. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 4, characterized in that, The sliding collar (5) is provided with an adsorption component for sucking up dust in the placement groove (302) when the sliding collar (5) slides along the guide groove (201).

6. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 5, characterized in that, The adsorption assembly includes several first channels (501), each of which is located within a sliding collar (5) and is connected to a guide groove (201); several second channels (401) are located within a rotating collar (4), each of which is connected to a first channel (501); several third channels (303) are located inside a placement cover (3), each of which is connected to a second channel (401); several cleaning channels (304) are located inside a placement platform (301) and are connected to a placement groove (302), each of which is connected to a third channel (303) in a one-to-one manner; the diameter of each third channel (303) is larger than the diameter of each cleaning channel (304).

7. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 6, characterized in that, The end of the cleaning channel (304) away from the third channel (303) is close to the bottom of the placement slot (302).

8. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 7, characterized in that, The diameter of the second channel (401) is smaller than that of the third channel (303).

9. The diffuse reflectance spectrometer for determining the oil content of peanut seeds according to claim 8, characterized in that, The surface of the lid (3) is provided with anti-slip texture.

10. A method for determining the diffuse reflectance spectroscopy content of peanut seed oil, comprising the diffuse reflectance spectroscopy device for determining the oil content of peanut seed according to claim 1, characterized in that, Includes the following steps: Step 1: Place the pre-treated peanut seeds into the placement slot (302) of the placement platform (301), and then connect the placement cover (3) with the sliding component; Step 2: Push the sliding collar (5) along the guide groove (201) toward the detection end of the probe (102) until the peanut seed is in close contact with the detection end of the probe (102); then transmit near-infrared light to the probe (102) through the optical fiber (101). The near-infrared light emitted by the probe (102) irradiates the detection surface of the peanut seed. The light signal after diffuse reflection inside the peanut seed is collected by the probe (102) and then transmitted back to the host (1) through the optical fiber (101) to complete the acquisition and preliminary recording of the spectral signal. Step 3: The host (1) preprocesses the acquired raw spectral signal, uses the preset near-infrared diffuse reflectance quantitative model of peanut oil content, analyzes and calculates the preprocessed spectral signal, and outputs the oil content measurement result of peanut seeds; after the detection is completed, pull the placement cover (3) in the opposite direction to remove the placement cover (3) from the sliding component, take out the detected peanut seeds, and wait for the next detection.

Images