A handheld Raman spectrometer

Abstract

The present invention discloses a handheld Raman spectrometer, which relates to the technical field of Raman spectrometers. The Raman spectrometer comprises a body, a probe disposed on the surface of the body, and a Raman controller disposed on the body. The Raman controller comprises a laser emission adjustment module, a Raman scattered light detection module, a signal processing and analysis module, a storage module, and a display and interaction module. The laser emission adjustment module is used to dynamically adjust the laser emission power of the handheld Raman spectrometer based on the instrument performance factors and environmental factors of the handheld Raman spectrometer. The Raman scattered light detection module is used to convert the Raman scattered light signal into an electrical signal and transmit it to the signal processing and analysis module. The present invention uses the Raman controller to dynamically adjust the laser emission power of the handheld Raman spectrometer based on the instrument performance factors and environmental factors of the handheld Raman spectrometer, so that the instrument always maintains optimal detection performance under different instrument states and usage environments, ensuring the effective acquisition of Raman scattered light signals and improving the accuracy and stability of detection.

Description

Technical Field

[0001] The present invention relates to the technical field of Raman spectrometers, and in particular to a handheld Raman spectrometer. Background Art

[0002] Raman spectroscopy is a type of scattering spectrum. Raman spectrometers can accurately analyze a substance's composition and structure by detecting its Raman scattering signals. Handheld Raman spectrometers, due to their portability, are widely used in scenarios such as rapid on-site testing, field operations, and real-time quality monitoring, significantly improving detection efficiency and flexibility.

[0003] Existing handheld Raman spectrometers are used in dusty construction sites, workshops with scattered chemical raw materials, or in outdoor environments with high humidity and impurities. The probe, as the core detection component, lacks effective protection mechanisms and is easily corroded by dust and water vapor, or damaged by accidental collisions and scratches, resulting in distortion of the detection signal and a decrease in accuracy. Furthermore, traditional instruments lack flexibility in controlling laser emission power and are unable to dynamically adjust to changes in instrument performance and environmental factors, making it difficult to maintain optimal detection performance under different working conditions. Furthermore, regarding data storage and management, local storage capacity is limited, making data sharing inconvenient and hindering team collaboration and remote diagnosis. Therefore, it is necessary to propose a handheld Raman spectrometer. Summary of the Invention

[0004] The purpose of the present invention is to provide a handheld Raman spectrometer in order to solve the above-mentioned technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A handheld Raman spectrometer, comprising a body, a probe disposed on a surface of the body, and a Raman controller disposed on the body, characterized in that it further comprises:

[0007] Fixed seat: The fixed seat is set on the outside of the probe and is fixedly connected to the surface of the body;

[0008] A protective cover for covering the probe: a first elastic ring is sleeved on the outer side of the protective cover, a second elastic ring is sleeved on the outer side of the fixing seat, and the first elastic ring and the second elastic ring are connected by an elastic member;

[0009] The Raman controller includes a laser emission adjustment module, a Raman scattered light detection module, a signal processing and analysis module, a storage module, and a display and interaction module;

[0010] The laser emission adjustment module is used to dynamically adjust the laser emission power of the handheld Raman instrument according to the instrument performance factors and environmental factors of the handheld Raman instrument; the Raman scattered light detection module is used to convert the Raman scattered light signal into an electrical signal and transmit it to the signal processing and analysis module;

[0011] The signal processing and analysis module performs spectral matching analysis on the Raman scattered light signal, outputs the detection results and sends them to the storage module; the storage module is used to store the detection results; the display and interaction module displays the detection results stored in the storage module in the form of charts and text.

[0012] As a further description of the above technical solution:

[0013] The outer surface of the protective cover is provided with a first annular groove which cooperates with the first elastic ring, the outer surface of the fixing seat is provided with a second annular groove which cooperates with the second elastic ring, and the inner side of the protective cover is symmetrically provided with two clamping assemblies which cooperate with the fixing seat;

[0014] As a further description of the above technical solution:

[0015] The clamping assembly includes a T-shaped slide bar, a connecting rod and a limit rod. The side wall of the protective cover is provided with a mounting groove for installing the T-shaped slide bar. The mounting groove is connected to the first annular groove. The T-shaped slide bar is connected to the inner wall of the mounting groove through a spring. The elastic force of the spring is less than the elastic force of the first elastic ring. One end of the T-shaped slide bar is movable through the protective cover and is connected to the limit rod through the connecting rod. The inner wall of the fixing seat is used for the clamping groove for the limit rod to be clamped.

[0016] As a further description of the above technical solution:

[0017] The laser emission power of the handheld Raman instrument is dynamically adjusted according to the instrument performance factors and environmental factors of the handheld Raman instrument. Specifically:

[0018] Obtain instrument performance factors of handheld Raman spectrometers, including detector sensitivity and optical transmission efficiency;

[0019] Set the standard value of any sensitivity or optical transmission efficiency in the instrument performance factors, and subtract the corresponding standard value from the sensitivity or optical transmission efficiency to obtain the corresponding standard deviation value of the sensitivity or optical transmission efficiency;

[0020] The handheld Raman spectrometer is equipped with an ambient light sensor to monitor the ambient light intensity in real time. The normal ambient light intensity value of the handheld Raman spectrometer is set, and the normal ambient light intensity value is subtracted from the external ambient light intensity to obtain the normal ambient light intensity difference.

[0021] The light path impact value is obtained by weighted calculation of the standard deviation corresponding to the sensitivity and light path transmission efficiency and the difference in normal ambient light intensity;

[0022] The time zone within the preset time length before the current moment is marked as the dynamic monitoring time zone;

[0023] Calculate the statistical indicators of the optical path impact value within the dynamic monitoring time zone; the statistical indicators include maximum value, minimum value, mean value, and standard deviation;

[0024] The optical path impact value and all indicators in the statistical indicators are weightedly calculated to obtain the optical path comprehensive shadow value; the optical path evaluation range is set, and the optical path comprehensive shadow value is compared with the optical path evaluation range. If the optical path comprehensive shadow value is not within the optical path evaluation range, it is determined that the current optical path is not in a normal working state, and a laser adjustment signal is generated;

[0025] The laser adjustment signaling is used to trigger the conversion of the optical path shadow value into a dynamic adjustment factor of the laser emission power through a preset conversion algorithm, and trigger the dynamic adjustment of the laser emission power using the dynamic adjustment factor.

[0026] As a further description of the above technical solution:

[0027] The optical path transmission efficiency is obtained as follows:

[0028] A calibrated light source is provided in the handheld Raman spectrometer, and micro optical sensors are provided at specific locations along each link of the optical path, hereinafter referred to as optical sensors;

[0029] The handheld Raman instrument's optical transmission system is regularly self-checked to activate the calibration light source. The calibration light pulse travels along an optical transmission path similar to that of the Raman detection laser. As the calibration light pulse passes through each optical sensor, each optical sensor instantly converts the sensed light intensity into an electrical signal. This signal is then converted into a digital signal through an analog-to-digital converter and marked as a light intensity value.

[0030] Arrange the light intensity values ​​collected by each light sensor in time sequence and light path position sequence to obtain a light intensity change data set of the calibration light transmitted in the light path;

[0031] Obtain the light intensity value of any adjacent light sensor, subtract the light intensity value of the previous light sensor from the next light sensor, and divide the light intensity value of the previous light sensor to obtain the light intensity attenuation ratio of the adjacent light sensors;

[0032] The light intensity attenuation ratios of all adjacent light sensors are averaged and their standard deviations are calculated to obtain the light intensity attenuation mean and light intensity attenuation trend values. The light path transmission efficiency is obtained by weighted calculation of the light intensity attenuation mean and light intensity attenuation trend values.

[0033] As a further description of the above technical solution:

[0034] The Raman controller is also provided with a supporting remote monitoring platform; the remote monitoring platform includes a cloud storage module, a device registration module, and a remote monitoring module;

[0035] The cloud storage module is used to encrypt all the test results collected by the handheld Raman spectrometer and upload them to the cloud server for cloud storage;

[0036] The device registration module is used to submit the device meta information of the handheld Raman spectrometer for verification and registration; the handheld Raman spectrometer that has been successfully verified and registered is marked as a certified operating Raman device; wherein the device meta information includes the device model, serial number, manufacturer, purchase date, and hardware configuration details;

[0037] The remote monitoring module is used to submit the user's registration information for registration and generate a cloud login account for the successfully registered user; the cloud login account is used to log in on the smart terminal and remotely view the test results of the authenticated Raman device;

[0038] The Raman controller is provided with a communication module for communicating with a remote monitoring platform.

[0039] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] 1. The present invention uses a Raman controller to dynamically adjust the laser emission power of the handheld Raman instrument based on the instrument performance factors and environmental factors. This allows the instrument to always maintain optimal detection performance under different instrument states and usage environments, ensuring the effective acquisition of Raman scattered light signals and improving detection accuracy and stability.

[0041] 2. By setting up a remote monitoring platform, the present invention realizes secure cloud storage and convenient sharing of data, facilitates team collaboration and historical data backtracking, and can remotely view equipment status and test results in real time, improving management decision-making efficiency. It also improves the overall use efficiency and management level of handheld Raman spectrometers and expands their application range.

[0042] 3. The present invention provides a protective cover to effectively prevent damage to the probe from external dust, water vapor and physical collisions, thereby increasing the service life of the probe. Through the coordinated action of the fixing base, the first elastic ring, the second elastic ring and the elastic member, the elastic ring can be moved by applying a moderate external force, and the protective cover can be opened and closed with the cooperation of the clamping assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic structural diagram of a Raman spectrometer in an installed protective cover state according to an embodiment of the present invention is shown;

[0044] Figure 2 A schematic structural diagram of a Raman spectrometer in a state where a protective cover is separated according to an embodiment of the present invention is shown;

[0045] Figure 3It shows a schematic structural diagram of the protective cover and the fixing base in a closed state according to an embodiment of the present invention;

[0046] Figure 4 It shows a schematic structural diagram of the protective cover and the fixing base in a separated state according to an embodiment of the present invention;

[0047] Figure 5 A cross-sectional view of a protective cover structure provided according to an embodiment of the present invention is shown;

[0048] Figure 6 A cross-sectional view of a fixing seat structure provided according to an embodiment of the present invention is shown;

[0049] Figure 7 A schematic diagram of a partial structure of a clamping assembly according to an embodiment of the present invention is shown;

[0050] Figure 8 A principle block diagram of a Raman controller provided according to an embodiment of the present invention is shown.

[0051] Legend: 1. Machine body; 2. Protective cover; 3. Probe; 4. Fixing seat; 5. First elastic ring; 6. Second elastic ring; 7. Elastic member; 8. First annular groove; 9. Second annular groove; 10. Connecting rod; 11. T-shaped slide bar; 12. Spring; 13. Limiting rod; 14. Snap-in groove. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] like Figures 1-8 As shown, a handheld Raman spectrometer includes a body 1, a probe 3 provided on the surface of the body 1, and a Raman controller provided on the body 1, and further includes:

[0054] Fixed seat 4: The fixed seat 4 is sleeved on the outside of the probe 3 and fixedly connected to the surface of the body 1. The fixed seat 4 is an annular structure. The fixed seat 4 is fixed to the surface of the body 1 by screws or welding. The fixed seat 4 and the probe 3 are coaxially arranged;

[0055] A protective cover 2 for covering the probe 3: a first elastic ring 5 is sleeved on the outside of the protective cover 2, and a second elastic ring 6 is sleeved on the outside of the fixing seat 4. The first elastic ring 5 and the second elastic ring 6 are elastic, which facilitates installation and disassembly. The first elastic ring 5 and the second elastic ring 6 are connected by an elastic member 7. After the staff opens the protective cover 2, the protective cover 2 is pulled under the connection of the elastic member 7 to prevent the protective cover 2 from being lost if it is placed arbitrarily after opening.

[0056] The Raman controller includes a laser emission adjustment module, a Raman scattered light detection module, a signal processing and analysis module, a storage module, and a display and interaction module;

[0057] The laser emission adjustment module is used to dynamically adjust the laser emission power of the handheld Raman instrument according to the instrument performance factors and environmental factors of the handheld Raman instrument; the Raman scattered light detection module is used to convert the Raman scattered light signal into an electrical signal and transmit it to the signal processing and analysis module;

[0058] The signal processing and analysis module performs spectral matching analysis on the Raman scattered light signal, outputs the detection results and sends them to the storage module; it should be noted that the spectral matching algorithm is such as the multivariate linear regression algorithm combined with principal component analysis. In this system, this algorithm extracts and models features from a large number of standard Raman spectra databases of known substances, accurately identifies the characteristic peaks in the measured Raman spectra, and then realizes the qualitative judgment of the sample components and the quantitative calculation of the content; the output detection results are sent to the storage module in the form of standardized data reports based on the specific application scenario requirements. In the field of food testing, the test results are accurate to the mass percentage of the main components, and are presented in the form of a detailed list of ingredients and the corresponding content values; in the environmental monitoring scenario, not only a qualitative conclusion is given for the pollutant components, but also its concentration is quantified in units of ppm (parts per million) or ppb (parts per billion) according to relevant standards to ensure that the accuracy and practicality requirements of Raman spectroscopy test results in different industries are met. Therefore, the above algorithm adopts a mature and widely recognized general algorithm in the industry, and for this reason it is not explicitly described in this application; the storage module is used to store the test results; the display and interaction module displays the test results stored in the storage module in the form of charts and text.

[0059] Furthermore, a first annular groove 8 is formed on the outer surface of the protective cover 2 to cooperate with the first elastic ring 5. The first annular groove 8 is adapted to the first elastic ring 5 and is used to stably fix the first elastic ring 5 in the first annular groove 8. A second annular groove 9 is formed on the outer surface of the fixing seat 4 to cooperate with the second elastic ring 6. The second annular groove 9 is adapted to the second elastic ring 6 and is used to stably fix the second elastic ring 6 in the second annular groove 9. Two clamping assemblies that cooperate with the fixing seat 4 are symmetrically provided on the inner side of the protective cover 2.

[0060] Furthermore, the clamping assembly includes a T-shaped slide bar 11, a connecting rod 10 and a limit rod 13. The side wall of the protective cover 2 is provided with a mounting groove for installing the T-shaped slide bar 11, and the mounting groove is connected to the first annular groove 8. The T-shaped slide bar 11 is connected to the inner wall of the mounting groove through a spring 12. The elastic force of the spring 12 is less than the elastic force of the first elastic ring 5. One end of the T-shaped slide bar 11 is movable through the protective cover 2 and is connected to the limit rod 13 through the connecting rod 10. The two ends of the connecting rod 10 are respectively threaded or welded to the surfaces of the T-shaped slide bar 11 and the limit rod 13. The inner wall of the fixing seat 4 is used for the clamping groove 14 for the limit rod 13 to be clamped. When in use, after the protective cover 2 is covered on the upper end of the fixing seat 4, the staff drives the first elastic ring 5 moves downward, so that the first elastic ring 5 is disengaged from the first annular groove 8, and the first elastic ring 5 releases the squeezing of the T-shaped slide bar 11. Under the restoring action of the spring 12, the T-shaped slide bar 11 moves, and the T-shaped slide bar 11 drives the limiting rod 13 to move through the connecting rod 10, so that the limiting rod 13 is snapped into the snap-fit ​​groove 14, and the protective cover 2 is limited and fixed. When the protective cover 2 needs to be opened, the staff drives the first elastic ring 5 to move upward, so that the first elastic ring 5 is snapped into the first annular groove 8, and then squeezes the T-shaped slide bar 11 to move, and the T-shaped slide bar 11 drives the limiting rod 13 to move through the connecting rod 10, so that the limiting rod 13 is disengaged from the snap-fit ​​groove 14, and the protective cover 2 can be opened.

[0061] Furthermore, the snap-fitting groove 14 is in a ring shape, and one end of the limiting rod 13 is provided with a chamfered corner that matches the snap-fitting groove 14, so that the limiting rod 13 can quickly snap-fit ​​with the snap-fitting groove 14, thereby achieving the effect of limiting and restraining the protective cover 2 and ensuring the stability of the closed state of the protective cover 2.

[0062] Furthermore, the cross section of the first elastic ring 5 is circular, which makes it convenient for the staff to drive the first elastic ring 5 to separate from the first annular groove 8.

[0063] Furthermore, the laser emission power of the handheld Raman instrument is dynamically adjusted according to the instrument performance factors and environmental factors of the handheld Raman instrument, specifically:

[0064] Obtain instrument performance factors of handheld Raman spectrometers, including detector sensitivity and optical transmission efficiency;

[0065] Set the standard value of any sensitivity or optical transmission efficiency in the instrument performance factors, and subtract the corresponding standard value from the sensitivity or optical transmission efficiency to obtain the corresponding standard deviation value of the sensitivity or optical transmission efficiency;

[0066] The handheld Raman spectrometer is equipped with an ambient light sensor to monitor the ambient light intensity in real time. The normal ambient light intensity value of the handheld Raman spectrometer is set, and the normal ambient light intensity value is subtracted from the external ambient light intensity to obtain the normal ambient light intensity difference.

[0067] The light path impact value is obtained by weighted calculation of the standard deviation corresponding to the sensitivity and light path transmission efficiency and the difference in normal ambient light intensity;

[0068] The time zone within the preset time length before the current moment is marked as the dynamic monitoring time zone;

[0069] Calculate the statistical indicators of the optical path impact value within the dynamic monitoring time zone; the statistical indicators include maximum value, minimum value, mean value, and standard deviation;

[0070] The optical path impact value and all indicators in the statistical indicators are weightedly calculated to obtain the optical path comprehensive shadow value; the optical path evaluation range is set, and the optical path comprehensive shadow value is compared with the optical path evaluation range. If the optical path comprehensive shadow value is not within the optical path evaluation range, it is determined that the current optical path is not in a normal working state, and a laser adjustment signal is generated;

[0071] The laser adjustment signaling is used to trigger the conversion of the optical path shadow value into a dynamic adjustment factor of the laser emission power through a preset conversion algorithm, and trigger the dynamic adjustment of the laser emission power using the dynamic adjustment factor.

[0072] Furthermore, the optical path transmission efficiency is obtained as follows:

[0073] A calibrated light source is provided in the handheld Raman spectrometer, and micro optical sensors are provided at specific locations along each link of the optical path, hereinafter referred to as optical sensors;

[0074] Periodically (e.g., every 10 tests or every 24 hours), the optical transmission system of the handheld Raman instrument is self-checked to activate the calibration light source. The calibration light pulse travels along an optical transmission path similar to that of the Raman detection laser. As the calibration light pulse passes through each optical sensor in sequence, each optical sensor instantly converts the sensed light intensity into an electrical signal. This signal is then converted into a digital signal through an analog-to-digital converter and marked as a light intensity value.

[0075] Arrange the light intensity values ​​collected by each light sensor in time sequence and light path position sequence to obtain a light intensity change data set of the calibration light transmitted in the light path;

[0076] Obtain the light intensity value of any adjacent light sensor, subtract the light intensity value of the previous light sensor from the next light sensor, and divide the light intensity value of the previous light sensor to obtain the light intensity attenuation ratio of the adjacent light sensors;

[0077] The light intensity attenuation ratios of all adjacent light sensors are averaged and their standard deviations are calculated to obtain the light intensity attenuation mean and light intensity attenuation trend values. The light path transmission efficiency is obtained by weighted calculation of the light intensity attenuation mean and light intensity attenuation trend values.

[0078] Furthermore, the Raman controller is also equipped with a remote monitoring platform; the remote monitoring platform includes a cloud storage module, a device registration module, and a remote monitoring module;

[0079] The cloud storage module is used to encrypt all the test results collected by the handheld Raman spectrometer and upload them to the cloud server for cloud storage, where the cloud server adopts a distributed storage architecture;

[0080] The device registration module is used to submit the device metadata of the handheld Raman spectrometer for verification and registration. The handheld Raman spectrometer that has been successfully verified and registered is marked as a certified Raman device. The device metadata includes the device model, serial number, manufacturer, purchase date, and hardware configuration details.

[0081] The remote monitoring module is used to submit user registration information for registration and generate a cloud login account for the successfully registered user. The cloud login account is used to log in on the smart terminal and remotely view the test results of the certified Raman device.

[0082] A communication module is installed in the Raman controller for communicating with the remote monitoring platform. It should be noted that the communication module adopts 5G and Wi-Fi6 dual modes to ensure high-speed and stable data transmission in different network environments. For example, in remote areas in the wild, 5G network can be used to transmit data in real time, and it will automatically switch to Wi-Fi6 when there is a Wi-Fi environment indoors, reducing power consumption and increasing transmission bandwidth.

[0083] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A handheld Raman spectrometer, comprising a body (1), a probe (3) disposed on the surface of the body (1), and a Raman controller disposed on the body (1), characterized in that: Also includes: Fixed seat (4): the fixed seat (4) is sleeved on the outside of the probe (3) and fixedly connected to the surface of the body (1); A protective cover (2) for covering the probe (3): a first elastic ring (5) is sleeved on the outer side of the protective cover (2), a second elastic ring (6) is sleeved on the outer side of the fixing seat (4), and the first elastic ring (5) and the second elastic ring (6) are connected via an elastic member (7); The Raman controller includes a laser emission adjustment module, a Raman scattered light detection module, a signal processing and analysis module, a storage module, and a display and interaction module; The laser emission adjustment module is used to dynamically adjust the laser emission power of the handheld Raman instrument according to the instrument performance factors and environmental factors of the handheld Raman instrument, specifically: Obtain instrument performance factors of handheld Raman spectrometers, including detector sensitivity and optical transmission efficiency; Set the standard value of any sensitivity or optical transmission efficiency in the instrument performance factors, and subtract the corresponding standard value from the sensitivity or optical transmission efficiency to obtain the corresponding standard deviation value of the sensitivity or optical transmission efficiency; The handheld Raman spectrometer is equipped with an ambient light sensor to monitor the ambient light intensity in real time. The normal ambient light intensity value of the handheld Raman spectrometer is set, and the normal ambient light intensity value is subtracted from the external ambient light intensity to obtain the normal ambient light intensity difference. The light path impact value is obtained by weighted calculation of the standard deviation corresponding to the sensitivity and light path transmission efficiency and the difference in normal ambient light intensity; The time zone within the preset time length before the current moment is marked as the dynamic monitoring time zone; Calculate the statistical indicators of the optical path impact value within the dynamic monitoring time zone; the statistical indicators include maximum value, minimum value, mean value, and standard deviation; The optical path impact value is weightedly calculated with all the indicators in the statistical index to obtain the optical path comprehensive shadow value; Set the optical path evaluation range, compare the optical path comprehensive shadow value with the optical path evaluation range, if the optical path comprehensive shadow value is not within the optical path evaluation range, it is determined that the current optical path is not in a normal working state, and a laser adjustment signal is generated; The laser adjustment signaling is used to trigger the conversion of the optical path comprehensive shadow value into a dynamic adjustment factor of the laser emission power through a preset conversion algorithm, and trigger the dynamic adjustment of the laser emission power using the dynamic adjustment factor; The Raman scattered light detection module is used to convert the Raman scattered light signal into an electrical signal and transmit it to the signal processing and analysis module; The signal processing and analysis module performs spectrum matching analysis on the Raman scattered light signal, outputs the detection result and sends it to the storage module; The storage module is used to store the detection results; The display and interaction module displays the test results stored in the storage module in the form of charts and text.

2. A handheld Raman spectrometer according to claim 1, characterized in that: The outer surface of the protective cover (2) is provided with a first annular groove (8) that matches the first elastic ring (5), the outer surface of the fixing seat (4) is provided with a second annular groove (9) that matches the second elastic ring (6), and the inner side of the protective cover (2) is symmetrically provided with two clamping assemblies that match the fixing seat (4).

3. A handheld Raman spectrometer according to claim 2, characterized in that: The clamping assembly includes a T-shaped slide bar (11), a connecting rod (10) and a limiting rod (13). The side wall of the protective cover (2) is provided with a mounting groove for installing the T-shaped slide bar (11), and the mounting groove is connected to the first annular groove (8). The T-shaped slide bar (11) is connected to the inner wall of the mounting groove through a spring (12). The elastic force of the spring (12) is less than the elastic force of the first elastic ring (5). One end of the T-shaped slide bar (11) is movable through the protective cover (2) and is connected to the limiting rod (13) through the connecting rod (10). The inner wall of the fixing seat (4) is provided with a clamping groove (14) for the limiting rod (13) to be clamped.

4. A handheld Raman spectrometer according to claim 3, characterized in that: The clamping groove (14) is ring-shaped, and one end of the limiting rod (13) is provided with a rounded corner that matches the clamping groove (14).

5. The handheld Raman spectrometer according to claim 1, characterized in that: The first elastic ring (5) has a circular cross section.

6. The handheld Raman spectrometer according to claim 1, characterized in that: The optical path transmission efficiency is obtained as follows: A calibrated light source is provided in the handheld Raman spectrometer, and micro optical sensors are provided at specific locations along each link of the optical path, hereinafter referred to as optical sensors; The handheld Raman instrument's optical transmission system is regularly self-checked to activate the calibration light source. The calibration light pulse travels along an optical transmission path similar to that of the Raman detection laser. As the calibration light pulse passes through each optical sensor, each sensor instantly converts the sensed light intensity into an electrical signal. This signal is then converted into a digital signal via an analog-to-digital converter and marked as a light intensity value. Arrange the light intensity values ​​collected by each light sensor in time sequence and light path position sequence to obtain a light intensity change data set of the calibration light transmitted in the light path; Obtain the light intensity value of any adjacent light sensor, subtract the light intensity value of the previous light sensor from the next light sensor, and divide the light intensity value of the previous light sensor to obtain the light intensity attenuation ratio of the adjacent light sensors; The light intensity attenuation ratios of all adjacent light sensors are averaged and their standard deviations are calculated to obtain the light intensity attenuation mean and light intensity attenuation trend values. The light path transmission efficiency is obtained by weighted calculation of the light intensity attenuation mean and light intensity attenuation trend values.

7. The handheld Raman spectrometer according to claim 1, characterized in that: The Raman controller is also provided with a supporting remote monitoring platform; the remote monitoring platform includes a cloud storage module, a device registration module, and a remote monitoring module; The cloud storage module is used to encrypt all the test results collected by the handheld Raman spectrometer and upload them to the cloud server for cloud storage; The device registration module is used to submit the device metadata of the handheld Raman spectrometer for verification and registration; the handheld Raman spectrometer that has been successfully verified and registered is marked as a certified operating Raman device; The device metadata includes device model, serial number, manufacturer, purchase date, and hardware configuration details; The remote monitoring module is used to submit the user's registration information, register, and generate a cloud login account for the successfully registered user; the cloud login account is used to log in on the smart terminal and remotely view the test results of the authenticated Raman device; The Raman controller is provided with a communication module for communicating with a remote monitoring platform.

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