Open light cell probe for full spectrum analysis and water quality monitoring equipment

Abstract

The invention relates to the technical field of water quality monitoring. The invention provides an open light pool probe for full spectrum analysis, which comprises a second stepping motor, a sliding screw rod, a sliding module, a reflector fixing rod, a reflector, a reflector base, a light window lens, a collimating lens and an optical fiber sleeve, an output shaft of the second stepping motor is connected with the sliding screw rod, the sliding screw rod is connected with the sliding module, and the sliding module is connected with the reflector fixing rod. The sliding module is connected with the reflecting mirror fixing rod, the reflecting mirror fixing rod is connected with the reflecting mirror base, the reflecting mirror is fixed to the middle of the reflecting mirror base, the light window lens is arranged at the bottom of the optical fiber sleeve shell right opposite to the reflecting mirror, and the collimating lens is located in the optical fiber sleeve and right opposite to the light window lens. According to the open light pool probe for the full spectrum analysis, the light path does not need to be manually adjusted, the light window lens can be cleaned and the length of the light path can be adjusted only by setting corresponding parameters in a program, cleaning is convenient and fast, the light path adjusting precision is high, the speed is high, and continuous adjustment can be achieved.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, and in particular to an open-cell probe and water quality monitoring equipment for full-spectrum analysis. Background Technology

[0002] Full-spectrum analysis is an analytical method that obtains the composition and properties of a substance by measuring its absorption or reflection characteristics across the entire spectrum. Existing technologies mostly rely on optical detection of a single wavelength or limited band, which cannot comprehensively reflect the complex composition of water bodies. Full-spectrum analysis can provide rich spectral information, enabling rapid and accurate detection of multiple substances, and has been widely used in environmental monitoring, industrial production, and medical diagnostics. For example, in water quality monitoring, full-spectrum analysis can simultaneously monitor multiple parameters such as permanganate index, BOD, and TOC.

[0003] In full-spectrum analysis, probe cleaning is crucial. Dirt or impurities on the probe surface can affect the transmission and reception of spectral signals, leading to inaccurate measurement results. Traditional cleaning methods typically require manual disassembly of the probe, which is not only time-consuming and labor-intensive but can also damage the probe due to improper operation. In recent years, some automated cleaning devices have been developed, such as those using nitrogen purging or cleaning fluid rinsing of the probe surface. However, these methods still have some limitations, such as potentially insufficient cleaning effectiveness, complex installation, or inability to adapt to cleaning needs in different environments.

[0004] Optical path length is a crucial factor affecting the accuracy of spectral measurements. Different measurement objects and environments may require different optical path lengths to obtain optimal measurement results. Traditional water quality monitoring probes typically employ a fixed optical path length design, making it difficult to adapt to the measurement needs of water bodies with varying turbidity and concentrations, thus limiting measurement accuracy. While full-spectrum analysis technology can provide more comprehensive water quality information, the fixed optical path length design leads to severe light signal attenuation in high-turbidity or high-concentration water bodies, and makes it difficult to detect accurate light signals in low-concentration water bodies, affecting the accuracy of the detection results.

[0005] Invention patent CN109975223A discloses an invention patent for a variable optical path water quality detection system and method. The technical solution is as follows: This application belongs to the field of water quality detection, and particularly relates to a variable optical path water quality monitoring system and method. It includes at least two variable reflectivity mirrors, with the water sample to be tested positioned between the two mirrors. A variable aperture is located on one side outside the two mirrors, and a light source is located on the other side. For the same water sample, different optical paths can be used for cross-verification, improving measurement accuracy. Furthermore, it achieves an adjustable optical path within a single device. By adjusting the aperture size, different equivalent optical paths can be achieved, enabling effective measurement of water samples with a wide range of contamination levels. However, this patent uses aperture adjustment to control the optical path change. When the aperture is reduced to pursue a narrower spectral bandwidth (improving theoretical accuracy), most of the light is physically blocked, causing a quadratic decrease in the total light energy reaching the detector, resulting in a sharp deterioration in the signal-to-noise ratio. In weak light or detection requiring rapid response (such as trace pollutant monitoring), this may directly lead to the signal being overwhelmed by noise, worsening the detection limit. This runs counter to the goal of full-spectrum monitoring, which seeks high sensitivity and wide dynamic range.

[0006] Existing full-spectrum analysis probes still have shortcomings in terms of cleaning and optical path adjustment. Therefore, developing a probe based on full-spectrum analysis with automated cleaning and variable optical path is of great significance. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing an open-cell optical probe and water quality monitoring device for full-spectrum analysis. Based on the aforementioned problems, this invention proposes an open-cell optical probe for full-spectrum analysis that features both automatic cleaning and a variable optical path, significantly improving the accuracy and reliability of full-spectrum analysis. This open-cell probe better adapts to complex and changing measurement environments, reduces manual intervention, lowers maintenance costs, and simultaneously improves measurement efficiency and data quality.

[0008] The technical solution of this invention is implemented as follows: An open-cell probe for full-spectrum analysis includes a second stepper motor, a sliding screw, a sliding module, a reflector fixing rod, a reflector, a reflector base, an optical window lens, a collimating lens, and an optical fiber sleeve. The output shaft of the second stepper motor is connected to the sliding screw, which is connected to the sliding module. The sliding module is connected to the reflector fixing rod, which is connected to the reflector base. The reflector is fixed in the middle of the reflector base. The optical window lens is positioned at the bottom of the optical fiber sleeve housing, facing the reflector. The collimating lens is located inside the optical fiber sleeve and facing the optical window lens. The collimating lens is connected to an optical fiber, which is housed inside the optical fiber sleeve.

[0009] The open-cell probe for full-spectrum analysis described above further includes an optical path adjustment sleeve, a second limit switch for determining the optical path distance from the origin, and a third limit switch for preventing the optical path from exceeding the maximum distance. The second limit switch, the third limit switch, and the sliding module are disposed inside the optical path adjustment sleeve. The second limit switch is disposed above the third limit switch, and the sliding module is located between the second limit switch and the third limit switch.

[0010] As described above, for the open-cell probe used in full-spectrum analysis, the second stepper motor has a step angle of 1.8°, with 1000 pulses corresponding to 1 revolution, and 1 revolution corresponding to a 1mm stroke of the sliding lead screw.

[0011] The open-cell probe for full-spectrum analysis described above also includes an automatic light window cleaning assembly, which includes a first stepper motor and a cleaning brush, the cleaning brush being connected to the output shaft of the first stepper motor.

[0012] The open-cell probe for full-spectrum analysis described above also includes an automatic light window cleaning assembly, which includes an ultrasonic transducer.

[0013] As described above, the open light cell probe for full-spectrum analysis includes an automatic cleaning assembly for the light window, which further comprises an automatic cleaning sleeve and a temperature sensor, the temperature sensor being located at the bottom of the housing of the automatic cleaning sleeve.

[0014] As described above, the open light cell probe for full-spectrum analysis further includes a first limit switch that limits the stroke of the cleaning brush, the first limit switch being located at the bottom of the housing of the automatic cleaning sleeve.

[0015] The open-cell probe for full-spectrum analysis described above also includes a silicone slot, which is located in the middle of the inside of the fiber optic sleeve. The fiber optic sleeve encloses an optical fiber, which is fixed by the silicone slot. A collimating lens is connected to the connector below the optical fiber, and a collimating lens adapter is connected below the collimating lens. A sealing ring is installed at the connection between the collimating lens adapter and the fiber optic sleeve.

[0016] The open-cell probe for full-spectrum analysis described above further includes a concave groove and a sealing groove. The concave groove is located at the bottom of the optical path adjustment sleeve, and the lower end of the sliding screw is inserted into the concave groove. A sealing ring is embedded in the concave groove. The sealing groove is located at the bottom of the optical path adjustment sleeve, and the reflector fixing rod passes through the sealing groove. The sealing groove contains a double-layer groove, and a sealing ring is embedded in the sealing groove. The optical path adjustment sleeve is filled with high-pressure nitrogen gas at 0.12-0.15 MPa.

[0017] As described above, in the open-cell probe for full-spectrum analysis, the reflector mounting rod is made of ceramic material.

[0018] Based on the same inventive concept, the present invention also provides a water quality monitoring device, including an open optical cell probe for full-spectrum analysis as described above.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. In full-spectrum analysis, different measurement objects and environments may require different optical path lengths to obtain optimal measurement results. Traditional water quality monitoring probes typically employ a fixed optical path length design, making it difficult to adapt to the measurement needs of water bodies with varying turbidity and concentrations. This invention provides an open-cell probe for full-spectrum analysis, which uses a second stepper motor to control a sliding screw to move a reflector fixing rod up and down, achieving automatic adjustment of the optical path length. Users can set corresponding parameters in the program according to actual measurement needs, making the optical path length continuously adjustable within the range of 1–50 mm. This provides high adjustment accuracy and speed, better adapting to complex and changing measurement environments and improving measurement accuracy and data quality.

[0020] 2. This invention provides an open-cell optical probe for full-spectrum analysis. The second stepper motor has a step angle of 1.8°, with 1000 pulses corresponding to one revolution. One revolution corresponds to a 1mm stroke of the sliding lead screw, and the optical path adjustment range is 1–50 mm with an accuracy of up to 0.03 mm. This high-precision optical path adjustment capability allows the open-cell probe to accurately adjust the optical path according to different water conditions and measurement requirements, thereby obtaining more accurate spectral measurement results and improving measurement accuracy.

[0021] 3. This invention provides an open-cell optical probe for full-spectrum analysis, capable of adapting to the measurement needs of water bodies with varying turbidity and concentration. In high-turbidity or high-concentration water bodies, appropriately increasing the optical path length can reduce light signal attenuation and improve the accuracy of detection results; in low-turbidity or low-concentration water bodies, appropriately decreasing the optical path length can improve measurement sensitivity. Furthermore, this open-cell optical probe also features automatic water body type identification. When a significant change in light intensity is detected, it can automatically identify the water body type and automatically send instructions to the lower-level computer to adjust the optical path length, adapting to application scenarios with significant water body changes, thus exhibiting strong environmental adaptability.

[0022] 4. The open-cell probe for full-spectrum analysis provided by this invention fully considers waterproofing in its design and employs a series of waterproofing measures. For example, a sealing ring is installed at the connection between the collimating lens adapter and the fiber optic sleeve shell, and a concave groove for inserting a sliding screw is provided at the bottom of the optical path adjustment sleeve, with a sealing ring embedded in the concave groove, ensuring smooth sliding and effective waterproofing to the greatest extent. Nitrogen fills the sleeve cavity, and the optical path adjustment sleeve shell is filled with 0.12-0.15MPa high-pressure nitrogen to prevent moisture intrusion. In addition, the reflector fixing rod is made of ceramic material, which greatly reduces the probability of rusting of the reflector fixing rod, further improving the probe's waterproof performance and reliability, enabling it to operate stably in underwater environments for a long time.

[0023] 5. The present invention provides an open optical cell probe for full-spectrum analysis, which integrates a dual automatic system of self-cleaning optical window and self-adjusting optical path, and operates in a fully automated manner, breaking through the bottleneck of manual maintenance; reducing the maintenance frequency and realizing unattended continuous monitoring, which is especially suitable for scenarios such as buoys and unmanned vessels.

[0024] 6. This invention provides an open-cell optical transducer for full-spectrum analysis, wherein the temperature sensor is located at the bottom of the self-cleaning sleeve, enabling real-time detection of water temperature. Temperature is a crucial factor affecting water quality; monitoring water temperature allows for a more comprehensive understanding of the physicochemical properties of the water, providing more accurate data support for water quality analysis. Simultaneously, the temperature sensor helps monitor the probe's operating environment, ensuring it operates normally within a suitable temperature range, thus improving the probe's reliability and lifespan.

[0025] 7. The open-cell probe for full-spectrum analysis provided by this invention can also be cleaned by ultrasonic cleaning at a frequency of 5000 times / second, which can quickly clean the optical window lens and reflector in a short time and has excellent waterproof effect.

[0026] 8. The present invention provides a water quality monitoring device, including the open-cell probe for full-spectrum analysis as described above. This open-cell probe has a compact design and reasonable structure, and can be easily integrated into various water quality monitoring devices such as fixed stations, unmanned vessels, and buoy monitoring. By setting power input ports on these devices to provide power to the various functional electronic components of the probe, and simultaneously providing power to the various functional modules on the circuit through a power supply unit, the probe can operate stably on different monitoring platforms, meeting diverse water quality monitoring needs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the following description is only one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a three-dimensional structure of an open-cell probe for full-spectrum analysis provided by the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of an open-cell probe for full-spectrum analysis provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the mirror connection structure provided by the present invention; Figure 4 A schematic diagram of the bottom of the automatic cleaning sleeve provided by the present invention; Figure 5 This is a partial schematic diagram of the bottom of the optical path adjustment sleeve provided by the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of an open-cell probe for full-spectrum analysis provided in Embodiment 2 of the present invention.

[0029] In the diagram, 1. Fiber optic sleeve; 1-1. Fiber optic sleeve outer shell body; 1-2. Fiber optic sleeve conical upper cover plate; 1-3. Incident end cover plate; 1-4. Automatic cleaning sleeve outer shell; 1-5. Cleaning sleeve upper cover plate; 1-6. Optical path adjustment sleeve upper cover plate; 1-7. Optical path adjustment sleeve outer shell; 1-8. Telescopic end cover plate; 2. Automatic cleaning sleeve; 2-1. First stepper motor; 2-2. Cleaning brush; 2-3. Temperature sensor; 2-4. First limit switch; 3-1 Collimating lens; 3-2 Optical window lens; 3-4 Reflector; 3-5 Reflector base; 3-6 Silicone slot; 4. Optical path adjustment sleeve; 4-1 Second stepper motor; 4-2 Sliding screw; 4-3 Second limit switch; 4-4 Third limit switch; 4-5 Sliding module; 4-6 Concave slot; 4-7 Reflector fixing rod; 4-8 Sealing slot; 5. First wire hole; 6. Second wire hole; 7-1 Ultrasonic transducer. Detailed Implementation

[0030] In the following description, it should be understood that the terms "first," "second," etc., are used only to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for ease of description and simplification. They 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, and therefore should not be construed as limiting the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. In this document, unless otherwise stated, the term "multiple" means two or more.

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Example 1: like Figure 1-3As shown, an open-cell probe for full-spectrum analysis includes a second stepper motor 4-1, a sliding screw 4-2, a sliding module 4-5, a reflector fixing rod 4-7, a reflector 3-4, a reflector base 3-5, an optical window lens 3-2, a collimating lens 3-1, and an optical fiber sleeve 1. The output shaft of the second stepper motor 4-1 is connected to the sliding screw 4-2. The sliding screw 4-2 is connected to the sliding module 4-5. The sliding module 4-5 is connected to the reflector fixing rod 4-7. The reflector fixing rod 4-7 is connected to the reflector base 3-5. The reflector 3-4 is fixed in the middle of the reflector base 3-5. The optical window lens 3-2 is positioned at the bottom of the outer shell of the optical fiber sleeve 1, facing the reflector 3-4. The collimating lens 3-1 is located inside the optical fiber sleeve 1 and is positioned facing the optical window lens 3-2. The collimating lens 3-1 is connected to an optical fiber, which is disposed inside the optical fiber sleeve 1.

[0033] The optical path is as follows: when a light source with a certain intensity is emitted through the optical fiber incident end, it reaches the collimating lens 3-1 for focusing, then passes through the optical window lens 3-2 and illuminates the open optical cell between the optical window lens 3-2 and the reflector 3-4. The light is then reflected vertically by the reflector 3-4 to the open optical cell, and then passes through the optical window lens 3-2 and the collimating lens 3-1 to reach the optical fiber receiving end to receive the light intensity signal. The signal is then transmitted to the detector for reading.

[0034] In this embodiment, the second stepper motor 4-1 controls the sliding screw 4-2 to move the reflector fixing rod 4-7 up and down, thereby achieving automatic adjustment of the optical path. Controlled by the host computer software, the required optical path can be calculated based on the currently detected light absorption intensity of the water body, adapted to the fingerprint database within the model, and automatically adjusted. Alternatively, a fixed optical path can be manually set on the host computer software. Upon receiving the setting command, the second stepper motor 4-1 drives the sliding screw 4-2 to rotate, which in turn moves the reflector fixing rod 4-7 up and down, thus adjusting the optical path.

[0035] Preferably, it further includes an optical path adjustment sleeve 4, a second limit switch 4-3 for determining the position of the optical path distance from the origin, and a third limit switch 4-4 for preventing the optical path from exceeding the maximum distance. The second limit switch 4-3, the third limit switch 4-4, and the sliding module 4-5 are disposed inside the optical path adjustment sleeve 4. The second limit switch 4-3 is disposed above the third limit switch 4-4, and the sliding module 4-5 is located between the second limit switch 4-3 and the third limit switch 4-4.

[0036] Preferably, the second stepper motor 4-1 has a step angle of 1.8°, with 1000 pulses corresponding to 1 revolution. One revolution corresponds to a 1mm stroke of the sliding lead screw 4-2, and its vertical load is 1.9kg. The optical path is twice the distance between the 3-2 optical window lens and the 3-4 reflector. The optical path adjustment range is 1-50mm with an accuracy of 0.03mm. Different pulse numbers correspond to different stroke changes, achieving the purpose of controlling the optical path distance.

[0037] As a preferred embodiment, the system also includes an automatic window cleaning assembly, which includes a first stepper motor 2-1 and a cleaning brush 2-2, wherein the cleaning brush 2-2 is connected to the output shaft of the first stepper motor 2-1.

[0038] like Figure 4 As shown, preferably, the automatic cleaning assembly for the light window further includes an automatic cleaning sleeve 2 and a temperature sensor 2-3, wherein the temperature sensor 2-3 is disposed at the bottom of the outer casing of the automatic cleaning sleeve 2. The cleaning brush 2-2 is disposed at the bottom of the outer casing of the automatic cleaning sleeve 2.

[0039] Preferably, the automatic cleaning assembly for the light window further includes a first limit switch 2-4 that limits the travel of the cleaning brush 2-2, and the first limit switch 2-4 is disposed at the bottom of the outer shell of the automatic cleaning sleeve 2.

[0040] In a preferred embodiment, during use, the probe of the temperature sensor 2-3 protrudes 1mm from the bottom of the outer shell of the automatic cleaning sleeve 2 to monitor the water temperature in the water, and the first limit switch 2-4 is embedded in the bottom of the outer shell of the automatic cleaning sleeve 2, with the sensing part flush with the bottom of the automatic cleaning sleeve 2. The automatic cleaning process and the optical path adjustment process work together. When the host computer times or triggers a cleaning command, the second stepper motor 4-1 drives the sliding screw 4-2 to rotate, causing the reflector 3-4 to move to the optical path 20mm position. This position is 10mm away from the light window lens 3-2. This position is used as the cleaning point of the lens. The first stepper motor 2-1 drives the cleaning brush 2-2 to clean the light window lens 3-2 and the reflector 3-4. When the cleaning command is issued, the cleaning brush 2-2 stops moving when it touches the first limit switch 2-4, and triggers the open light pool probe to adjust the optical path. The second stepper motor 4-1 drives the sliding screw 4-2 to the origin 1mm optical path position, and then from the origin position to the optical path position before the cleaning command.

[0041] The cleaning brush 2-2 is a rubber scraper. The program controls the first stepper motor 2-1 to drive the cleaning brush 2-2 in a swinging motion. When the program issues a cleaning stop command, the cleaning brush 2-2 stops moving when it reaches the first limit switch 2-4, effectively cleaning the reflector 3-4 and the optical path lens 3-2. A program is set in the host computer to periodically and automatically clean the optical path lens 3-2 to ensure the cleanliness of the area between the optical path lens 3-2 and the reflector 3-4, unaffected by changes in light intensity due to aquatic plants and silt in the water.

[0042] Preferably, it also includes a silicone slot 3-6, which is located in the middle of the inside of the fiber optic sleeve 1. The fiber optic sleeve 1 encloses the fiber optic cable, and the fiber optic cable is fixed by the silicone slot 3-6. A collimating lens 3-1 is connected to the connector below the fiber optic cable, and an incident end cover plate 1-3 is connected below the collimating lens 3-1. A sealing ring is installed at the connection between the incident end cover plate 1-3 and the fiber optic sleeve 1 to provide waterproofing and fixing.

[0043] Preferably, the optical fiber is configured as a 7-core, 600μm core UV-resistant fiber, capable of receiving wavelengths of light intensity in the 160-1300nm range. The 7 cores can transmit signals synchronously; 6 cores transmit incident light from the light source, and 1 core receives reflected light from the water body. This improves signal stability and redundancy, making it suitable for multi-channel parallel detection or signal backup, resulting in higher system reliability. If a single core is damaged, the remaining cores can still function, making it suitable for long-term continuous monitoring or harsh environments. The large core diameter (600μm) enhances light throughput. Compared to conventional cores (e.g., 200-400μm), the larger cross-sectional area of ​​600μm allows for coupling of more optical signals, significantly improving the signal-to-noise ratio, especially suitable for weak light detection. It also reduces alignment difficulty, facilitates interfacing with light sources and detectors, and reduces system debugging complexity. The UV-resistant coating extends service life; high photon energy in the ultraviolet band easily leads to aging and decreased transmittance in ordinary optical fibers. UV-resistant materials (such as fluorine-doped coatings and polyimide sheaths) can mitigate UV radiation damage and maintain long-term transmission stability.

[0044] like Figure 5 As shown, preferably, it also includes a concave groove 4-6 and a sealing groove 4-8. The concave groove 4-6 is located at the bottom of the optical path adjusting sleeve 4, and the lower end of the sliding screw 4-2 is inserted into the concave groove 4-6. The concave groove 4-6 has a sealing ring embedded in it to ensure smooth sliding and waterproofing when the sliding screw 4-2 slides up and down. The sealing groove 4-8 is located at the bottom of the optical path adjusting sleeve 4, and the reflector fixing rod 4-7 passes through the sealing groove 4-8. The sealing groove 4-8 contains a double-layer groove, and a sealing ring is embedded in it. The optical path adjusting sleeve 4 is filled with high-pressure nitrogen gas at 0.12-0.15 MPa. The above design ensures smooth sliding and effective waterproofing to the greatest extent.

[0045] Preferably, the reflector fixing rods 4-7 are made of ceramic material. Ceramic material has an extremely low coefficient of expansion, extremely high stability and rigidity, corrosion resistance and chemical inertness. In the water quality testing environment, the lifespan of ceramic fixing rods far exceeds that of metal, and they will not contaminate sensitive environments or samples due to corrosion products.

[0046] Preferably, the lenses of reflectors 3-4 are made of fused silica as a substrate, with an enhanced silver-plated inner layer and a planar reflective structure design, achieving a reflectivity of 90%-98% for ultraviolet-visible light (180-1100nm). Fused silica has excellent ultraviolet transmittance and thermal stability, and is characterized by corrosion resistance, high hardness, and ease of cleaning, making it suitable for long-term use in harsh environments. The enhanced silver-plated film has a broad-spectrum ultra-high reflectivity, which can increase its reflectivity in the ultraviolet-visible region (especially the critical 200-400nm wavelength) to over 95%, while maintaining a high reflectivity of >98% in the visible and near-infrared regions, ensuring signal strength across the entire spectrum.

[0047] In this embodiment, the fiber optic sleeve 1 includes, from top to bottom, a tapered upper cover 1-2, a main body 1-1, and an incident end cover 1-3. The automatic cleaning sleeve 2 includes, from top to bottom, a cleaning upper cover 1-5 and an automatic cleaning outer shell 1-4. The optical path adjustment sleeve 4 includes, from top to bottom, an optical path adjustment upper cover 1-6, an optical path adjustment outer shell 1-7, and a retractable end cover 1-8. The tapered upper cover 1-2, the cleaning upper cover 1-5, the optical path adjustment upper cover 1-6, and the retractable end cover 1-8 are secured with fluororubber gaskets and threaded locking, and verified through a 72-hour immersion test. In this embodiment, the outer shells of the three sleeves are connected into an integrated sleeve outer shell using a boring and milling process.

[0048] In this embodiment, a first wire passage hole 5 is provided at the connection between the optical fiber sleeve 1 and the automatic cleaning sleeve 2, and a second wire passage hole 6 is provided between the optical fiber sleeve 1 and the optical path adjustment sleeve 4. The pulse control line of the first stepper motor 2-1, the control line of the temperature sensor 2-3, and the power line of the first limit switch 2-4 all pass through the first wire passage hole 5 and are wrapped together with the optical fiber, passing through the silicone slot 3-6. Then, they are wrapped together with the pulse control line of the second stepper motor 4-1, the power line of the second limit switch 4-3, and the power line of the third limit switch 4-4, which pass through the second wire passage hole 6, and pass through the middle circular hole of the conical upper cover plate 1-2 of the optical fiber sleeve, connecting to the upper computer chassis control device.

[0049] In this embodiment, the optical fiber is connected to the collimating lens 3-1. The collimating lens 3-1 serves to fix the optical fiber and focus the light source emitted by the optical fiber. The collimating lens 3-1 is connected to the incident end cover plate 1-3. The incident end cover plate 1-3 and the collimating lens 3-1 are connected by a threaded rotation and a sealing ring. There is a 12.7×3mm space in the middle of the bottom of the incident end cover plate 1-3 for installing the light-transmitting window lens 3-2. When the light intensity I0 emitted by the light source reaches the collimating lens 3-1 after passing through the optical fiber and is focused, it passes through the light window lens 3-2 and illuminates the water in the open light pool. After passing through the reflector lens 3-4 (diameter 10mm, thickness 2mm), the reflected light returns to the optical fiber to receive the transmitted light intensity I. According to the Lambert-Beer law A = log(I0 / I), the absorbance value of the detected water is calculated, and the concentration of each monitored substance is deduced according to the model.

[0050] This invention provides an open-cell probe for full-spectrum analysis. A second stepper motor 4-1 controls a sliding screw 4-2 to move a reflecting mirror fixing rod 4-7 up and down, achieving automatic adjustment of the optical path. Users can set corresponding parameters in the program according to actual measurement needs, making the optical path continuously adjustable within the range of 1–50 mm. This provides high adjustment accuracy and speed, better adapting to complex and changing measurement environments and improving measurement accuracy and data quality.

[0051] The present invention provides an open-cell probe for full-spectrum analysis that eliminates the need for manual optical path adjustment. The optical window lens can be cleaned and the optical path length adjusted simply by setting the corresponding parameters in the program. The cleaning is convenient and quick, and the optical path adjustment is highly accurate and fast, and can be continuously adjusted.

[0052] Example 2: like Figure 6 As shown, unlike Embodiment 1, in another preferred embodiment, the automatic window cleaning assembly includes an ultrasonic transducer 7-1. The ultrasonic transducer 7-1 has a power of 70W and an ultrasonic frequency of 50kHz. The ultrasonic transducer 7-1 is enclosed within an automatic cleaning sleeve 2, and the vibrating surface is welded to the bottom of the automatic cleaning sleeve, maximizing cleaning efficiency and improving waterproofing during cleaning.

[0053] In use, the probe of temperature sensor 2-2 protrudes 1mm from the bottom of the outer shell of automatic cleaning sleeve 2 to monitor the water temperature. Ultrasonic transducer 7-1 is enclosed inside automatic cleaning sleeve 2, with its vibrating surface in contact with the bottom of the sleeve. When a cleaning command is issued, ultrasonic transducer 7-1 starts instantly, vibrating at a frequency of 5000 times per second. The vibration is transmitted into the liquid, forming cavitation bubbles. When the cavitation bubbles are burst, they generate a strong shock wave. The shock wave directly impacts the dirt, breaking its bond with the substrate, and can quickly clean the light window lens 3-2 and reflector 3-3 in a short time.

[0054] Example 3: This embodiment also provides a water quality monitoring device, including the open optical cell probe for full-spectrum analysis as described above. Water quality monitoring devices such as fixed stations, unmanned vessels, and buoy monitoring systems are equipped with power input ports to provide power to the various functional electronic components of the open optical cell probe, and simultaneously provide power to the various functional modules in the circuit through a power supply unit.

[0055] This invention provides a water quality monitoring device, including an open-cell probe for full-spectrum analysis as described above. This open-cell probe has a compact design and reasonable structure, allowing for easy integration into various water quality monitoring devices such as fixed stations, unmanned vessels, and buoy monitoring. By providing power input ports on these devices to supply power to the various electronic components of the probe, and simultaneously providing power to the various functional modules in the circuit through a power supply unit, the probe can operate stably on different monitoring platforms, meeting diverse water quality monitoring needs.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An open-cell probe for full-spectrum analysis, characterized in that, The system includes a second stepper motor (4-1), a sliding lead screw (4-2), a sliding module (4-5), a reflector fixing rod (4-7), a reflector (3-4), a reflector base (3-5), an optical window lens (3-2), a collimating lens (3-1), and an optical fiber sleeve (1). The output shaft of the second stepper motor (4-1) is connected to the sliding lead screw (4-2), the sliding lead screw (4-2) is connected to the sliding module (4-5), and the sliding module (4-5) is connected to the reflector fixing rod. The rod (4-7) is connected to the reflector base (3-5). The reflector (3-4) is fixed in the middle of the reflector base (3-5). The optical window lens (3-2) is located at the bottom of the fiber optic sleeve (1) facing the reflector (3-4). The collimating lens (3-1) is located inside the fiber optic sleeve (1) and is located facing the optical window lens (3-2). The collimating lens (3-1) is connected to the optical fiber, which is located inside the fiber optic sleeve (1).

2. The open-cell probe for full-spectrum analysis according to claim 1, characterized in that, It also includes an optical path adjustment sleeve (4), a second limit switch (4-3) for determining the position of the optical path distance from the origin, and a third limit switch (4-4) for preventing the optical path from exceeding the maximum distance. The second limit switch (4-3), the third limit switch (4-4), and the sliding module (4-5) are disposed inside the optical path adjustment sleeve (4). The second limit switch (4-3) is disposed above the third limit switch (4-4), and the sliding module (4-5) is located between the second limit switch (4-3) and the third limit switch (4-4).

3. The open-cell probe for full-spectrum analysis according to claim 1, characterized in that, The second stepper motor (4-1) is selected with a step angle of 1.8°, 1000 pulses correspond to 1 revolution, and 1 revolution corresponds to a stroke of 1mm for the sliding lead screw (4-2).

4. The open-cell probe for full-spectrum analysis according to claim 3, characterized in that, It also includes an automatic window cleaning component, which includes a first stepper motor (2-1) and a cleaning brush (2-2), the cleaning brush (2-2) being connected to the output shaft of the first stepper motor (2-1).

5. The open-cell probe for full-spectrum analysis according to claim 3, characterized in that, It also includes an automatic window cleaning assembly, which includes an ultrasonic transducer (7-1).

6. The open-cell probe for full-spectrum analysis according to any one of claims 4 or 5, characterized in that, The automatic cleaning assembly for the light window also includes an automatic cleaning sleeve (2) and a temperature sensor (2-3), wherein the temperature sensor (2-3) is located at the bottom of the housing of the automatic cleaning sleeve (2).

7. The open-cell probe for full-spectrum analysis according to claim 4, characterized in that, The automatic cleaning assembly for the light window also includes a first limit switch (2-4) that limits the travel of the cleaning brush (2-2), and the first limit switch (2-4) is located at the bottom of the outer shell of the automatic cleaning sleeve (2).

8. The open-cell probe for full-spectrum analysis according to claim 7, characterized in that, It also includes a silicone slot (3-6), which is located in the middle of the fiber optic sleeve (1). The fiber optic sleeve (1) is wrapped with an optical fiber, which is fixed by the silicone slot (3-6). A collimating lens (3-1) is connected to the connector below the optical fiber. A collimating lens adapter is connected below the collimating lens (3-1). A sealing ring is installed at the connection between the collimating lens adapter and the fiber optic sleeve (1).

9. The open-cell probe for full-spectrum analysis according to claim 7, characterized in that, It also includes a concave groove (4-6) and a sealing groove (4-8). The concave groove (4-6) is located at the bottom of the optical path adjustment sleeve (4). The lower end of the sliding screw (4-2) is inserted into the concave groove (4-6). A sealing ring is embedded in the concave groove (4-6). The sealing groove (4-8) is located at the bottom of the optical path adjustment sleeve (4). The reflector fixing rod (4-7) passes through the sealing groove (4-8). The sealing groove (4-8) contains a double-layer groove. A sealing ring is embedded in the sealing groove (4-8). The optical path adjustment sleeve (4) is filled with high-pressure nitrogen gas of 0.12-0.15 MPa.

10. A water quality monitoring device, characterized in that, Includes the open-cell probe for full-spectrum analysis as described in any one of claims 1 to 9.

Images