Deep sea in-situ multispectral detection system and use method thereof

Abstract

The invention provides a deep-sea in-situ multispectral detection system. The deep-sea in-situ multispectral detection system comprises a pressure-resistant cabin, a spectrum acquisition and analysis module, a laser emission and excitation module, a laser path switching and signal regulation and control module, a system control and power supply management module and a data communication and platform interface module, the pressure-resistant cabin body is composed of a main cabin body cylinder section, a front cabin cover, a rear cabin cover and annular reinforcing ribs evenly distributed outside the main cabin body cylinder section. The front cabin cover is provided with a main power supply control base, an external power supply control sealing base, a laser-induced breakdown spectroscopy detection window, a pressure-resistant optical cable cabin penetrating piece and a deflation valve; and various functional modules are arranged on a partition plate in the cabin body. According to the system, an in-situ multispectral detection system which has multispectral joint recognition capability, adapts to deep sea extreme environments and can carry various types of operation platforms is constructed, so that efficient, stable and full-chain in-situ recognition of complex objects such as deep sea fluid, sediment pore water and hydrates is realized, and the detection efficiency and the operation safety are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-spectral detection, in particular to a deep-sea in-situ multi-spectral detection system and a use method thereof. BACKGROUND

[0002] Deep-sea extreme environments (such as hydrothermal vents, cold-seep areas, subduction zone fronts and ultra-deep trenches) are the frontier fields of modern earth science and life science research, and are also the regions where the deep earth material-energy coupling and the biogeochemical processes act intensively. In these environments, there are widely existing volatile components (such as H2, CH4, CO2, H2S, etc.) containing hydrogen, sulfur and carbon, various metal ions (Fe, Mn, Zn, Cu, REEs, etc.), anions (CO3 2- , SO4 2- , etc.) and complex organic matter. These substances undergo intense interaction under extreme temperature and pressure and redox conditions, not only controlling the evolution and mineral precipitation processes of hydrothermal / cold-seep systems, but also deeply affecting the structure and function of deep-sea ecosystems, and having important significance for the study of the origin of life, energy storage and element cycle. However, the above important environmental information is mostly in the form of dissolved state, gaseous state or solid-liquid interface reaction, and the conventional off-line sampling and analysis method has significant limitations: the sample is easy to lose components, change forms or be oxidized and disturbed in the process of rising and recovering, resulting in that the analysis results cannot truly reflect the in-situ state.

[0003] At present, the in-situ Raman spectroscopy technology has been widely used in the identification of seabed gases, hydrates, fluid inclusions and organic molecules; the laser-induced breakdown spectroscopy is suitable for in-situ qualitative and semi-quantitative analysis of metal cations and rare earth elements; and the fluorescence spectroscopy technology can be used for detecting aromatic organic matter and biological fluorescent substances in the sea. However, most of the current spectral devices are still in the stage of independent operation of single spectral function, and cannot synchronously obtain complete spectral information for multiple types of components. Even if there are multi-channel devices, there are often problems such as large volume, low integration, complex deployment, difficult coupling of laser / optical system, low switching efficiency and the like, which are difficult to meet the high reliability and high efficiency requirements of deep-sea in-situ operation environment.

[0004] In addition, the deep-sea operation conditions are extremely harsh: it needs to withstand the high hydrostatic pressure brought by thousands of meters of water depth, the erosion of strong corrosive fluid, and the long-period unattended operation requirement; at the same time, the system needs to be compatible with the power supply and communication interface of manned submersibles, remote-controlled unmanned submersibles or landers, and has compact structure and rapid response capability, which puts high requirements on the spectral module, power supply system, optical system, timing control and cabin structure. Therefore, it is necessary to design a deep-sea in-situ multi-spectral detection system and a use method thereof. SUMMARY

[0005] The application aims to provide a deep-sea in-situ multi-spectral detection system and a use method thereof.

[0006] To achieve the above-mentioned purpose, the application provides the following solutions.

[0007] The deep-sea in-situ multi-spectral detection system comprises a pressure-resistant cabin body and functional modules in the cabin body; the pressure-resistant cabin body is composed of a main cabin body cylinder segment, a front cabin cover, a rear cabin cover and annular reinforcing ribs, the annular reinforcing ribs are uniformly distributed on the outside of the main cabin body cylinder segment to strengthen the pressure resistance of the main cabin body cylinder segment; the front cabin cover is provided with a main power supply control base, an external power supply control sealed base, a laser-induced breakdown spectroscopy detection window, a pressure-resistant optical cable cabin-penetrating part and a gas release valve.

[0008] The inside of the main cabin body cylinder segment is divided into a first cabin body and a second cabin body by an intermediate partition plate, and the functional modules are all arranged on the intermediate partition plate; the functional modules comprise a spectrum acquisition and analysis module, a laser emitter and excitation module, a laser path switching and signal regulation module, a system control and power supply management module and a data communication and platform interface module.

[0009] Optionally, the main power supply control base adopts an eight-core waterproof electrical connector and is arranged at the center position of the front cabin cover and is used for connecting a deep-sea special pressure-resistant cable; the external power supply control sealed base is arranged on both sides of the main power supply control base and is used for providing independent power supply and control signal transmission interfaces; the laser-induced breakdown spectroscopy detection window is made of thick-walled quartz glass and is located in the lower region of the front cabin cover, and the excitation light of the laser path switching and signal regulation module is emitted through the pressure-resistant quartz glass window; the pressure-resistant optical cable cabin-penetrating part has four independent channels and is all arranged around the upper edge of the front cabin cover; the gas release valve is arranged on the upper part of the front cabin cover and is used for vacuumizing the main cabin body cylinder segment; the main power supply control base, the external power supply control sealed base, the laser-induced breakdown spectroscopy detection window, the pressure-resistant optical cable cabin-penetrating part and the gas release valve all adopt a circular O-shaped ring seal.

[0010] Optionally, the spectrum acquisition and analysis module comprises a spectrometer and a photon camera; the spectrometer is located in the first cabin body, is closely connected with the pressure-resistant optical cable cabin-penetrating part and the laser-induced breakdown spectroscopy detection window and is used for sharing the spectrum signal collection in time; the photon camera is located at the outlet plane of the spectrometer, is closely coupled with the spectrometer and is used for converting the light signal after light splitting into an electric signal.

[0011] Optionally, the laser emitter and the excitation module comprise: a pulsed laser, a pulsed laser power supply unit and a continuous laser; the pulsed laser and the pulsed laser power supply unit are located in the second cabin, the pulsed laser is connected with the laser path switching and signal control module, and is used for providing a 1064 nm high-energy laser pulse and performing instantaneous high-energy excitation on the surface of the target substance; the continuous laser is arranged in the middle of the first cabin and is connected with the pressure-resistant cable cabin-penetrating piece, and is used for providing an excitation source for Raman and fluorescence.

[0012] Optionally, the laser path switching and signal control module comprises: a laser-induced breakdown spectroscopy focusing unit and a one-to-four light switching unit; the laser-induced breakdown spectroscopy focusing unit is located in front of the pulsed laser, and is used for laser energy collimation and focal point adjustment; the one-to-four light switching unit is connected with the continuous laser, and is used for switching and scheduling of Raman and fluorescence signals.

[0013] Optionally, the system control and power supply management module comprises: a timing signal generator and an external power supply and driving unit; the timing signal generator is located in the second cabin; and the external power supply and driving unit is located in the second cabin and is used for power supply for the system.

[0014] Optionally, the data communication and platform interface module comprises: a USB-to-network communication unit and a network switch; the USB-to-network communication unit is located in the first cabin and is close to the continuous laser, and is used for remote parameter setting, running state monitoring and spectrum data return; and the network switch is located in the first cabin and is used for expanding data access of the system.

[0015] Optionally, the pressure-resistant cable cabin-penetrating piece is embedded with an excitation optical fiber and a recovery optical fiber, the recovery optical fiber is connected with an external probe, the excitation optical fiber is used for transmitting excitation light, and the recovery optical fiber is used for transmitting Raman and fluorescence signals collected by the external probe; and the pressure-resistant cable cabin-penetrating piece adopts a metal sealing structure.

[0016] A use method of a deep-sea in-situ multi-spectral detection system, applied to the deep-sea in-situ multi-spectral detection system, comprises:

[0017] The front cabin cover is closed, dry gas is injected through the air release valve, and the cabin pressure is adjusted to 80% of the standard atmospheric pressure after the humidity is reduced to a safe range;

[0018] The four optical cables are connected with external probes through the pressure-resistant cable cabin-penetrating piece;

[0019] When the system is submerged to a predetermined operation area with the lander, excitation light is emitted to perform Raman or fluorescence excitation, and Raman or fluorescence signals are obtained;

[0020] The Raman or fluorescence signals are subjected to signal conversion;

[0021] The excitation light of the pulsed laser is focused by a laser-induced breakdown spectroscopy detection window to irradiate a target region, and plasma emission light is obtained.

[0022] The Raman or fluorescence signal and the plasma emission light after signal conversion are subjected to spectral analysis to obtain a detection result.

[0023] According to the specific embodiments of the present application, the following technical effects are disclosed: the deep-sea in-situ multi-spectral detection system provided by the present application comprises a pressure-resistant cabin body and functional modules inside the cabin body; the pressure-resistant cabin body is composed of a main cabin body cylinder segment, a front cabin cover, a rear cabin cover and ring-shaped reinforcing ribs, the ring-shaped reinforcing ribs are uniformly distributed on the outside of the main cabin body cylinder segment to strengthen the pressure resistance of the main cabin body cylinder segment; the front cabin cover is provided with a main power supply control base, an external device power supply control sealing base, a laser-induced breakdown spectroscopy detection window, a pressure-resistant optical cable cabin-penetrating part and a gas release valve; the inside of the main cabin body cylinder segment is divided into a first cabin body and a second cabin body by an intermediate partition plate, and the functional modules are all arranged on the intermediate partition plate; the functional modules comprise a spectral acquisition and analysis module, a laser emitter and excitation module, a laser path switching and signal regulation module, a system control and power supply management module and a data communication and platform interface module. The system constructs an in-situ multi-spectral detection system with multi-spectral joint identification capability, adaptability to deep-sea extreme environment and the ability to carry multiple types of operation platforms, realizes efficient, stable and full-chain in-situ identification of complex objects such as deep-sea fluid, sediment pore water and hydrate, and improves the detection efficiency and operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a whole schematic view of the main cabin body of the embodiment of the present application.

[0026] Figure 2 It is a front view of the main cabin body of the embodiment of the present application.

[0027] Figure 3 It is a schematic view of the front cabin cover of the embodiment of the present application.

[0028] Figure 4 It is a schematic view of the spectral probe of the embodiment of the present application.

[0029] Figure 5 It is a first side view of the internal structure of the main cabin body of the embodiment of the present application.

[0030] Figure 6It is a second side view of the internal structure of the main cabin body of the embodiment of the present application.

[0031] Figure 7 It is a plan view of the internal structure of the main cabin body of the embodiment of the present application.

[0032] Figure 8 It is a bottom view of the internal structure of the main cabin body of the embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be apparently and completely described below with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0034] The above-mentioned purposes, features and advantages of the present application can be more apparent and easy to understand. The present application will be further described in detail below with the accompanying drawings and specific embodiments.

[0035] As shown in the drawings, Figures 1-3 The embodiment of the present application provides a deep-sea in-situ multi-spectral detection system. The system adopts an integrated titanium alloy cylindrical pressure-resistant cabin body structure for packaging an internal core spectral detection and control unit. The system comprises a pressure-resistant cabin body and functional modules inside the cabin body. The pressure-resistant cabin body is made of titanium alloy material and has the characteristics of high strength, corrosion resistance and strong pressure resistance, and is suitable for long-term stable operation in deep-sea extreme environment. The pressure-resistant cabin body is composed of a main cabin body cylinder segment, a front cabin cover, a rear cabin cover and annular reinforcing ribs. The annular reinforcing ribs are uniformly distributed on the outside of the main cabin body cylinder segment to strengthen the pressure resistance of the main cabin body cylinder segment. The two ends of the main cabin body cylinder segment are respectively connected with the front cabin cover and the rear cabin cover through flanges.

[0036] Specifically, the front cabin cover is a functional interface intensive area, and is provided with a main power supply control base, an external device power supply control sealing base, a laser-induced breakdown spectroscopy detection window, a pressure-resistant optical cable cabin-penetrating part and a gas release valve. The inside of the main cabin body cylinder segment is divided into a first cabin body and a second cabin body by an intermediate partition plate, and the functional modules are all arranged on the intermediate partition plate. The functional modules comprise a spectral acquisition and analysis module, a laser emitter and excitation module, a laser path switching and signal control module, a system control and power supply management module and a data communication and platform interface module.

[0037] Specifically, the main power supply control base is arranged at the center of the front hatch for connecting the deep-sea special pressure cable to realize power supply and communication control with the ROV, HOV or lander platform. The base adopts an eight-core waterproof electrical connector, which has stable high-voltage resistance and signal integrity. The peripheral power supply control sealed base is arranged on both sides of the main power supply control base for providing independent power supply and control signal transmission interface for the system accessory module (such as the filtration system), and reserving standardized connection capability for system expandability and function expansion. The LIBS detection window is made of thick-walled quartz glass and located in the lower region of the front hatch, and is installed with a pressure-resistant quartz glass window. The inner side is connected with the pulsed laser of the laser path switching and signal control module, and the outer side is directly exposed to the deep-sea environment. The excitation light of the pulsed laser is emitted through the window to realize high-energy laser breakdown and plasma emission light collection of the external fluid or sediment, avoiding the loss and safety problems caused by high-energy excitation light transmission through the optical fiber. The pressure-resistant optical cable through-cabin part has four independent channels and is arranged around the upper edge of the front hatch. Each through-cabin part includes a pair of excitation optical fiber and recovery optical fiber. The excitation optical fiber is used to transmit Raman and fluorescence excitation light from the continuous laser to the external probe, and the recovery optical fiber introduces the scattered light or fluorescence signal collected by the probe into the spectrometer in the cabin, so that the system supports up to four Raman or fluorescence probes for parallel work, which is especially suitable for multi-point in-situ synchronous measurement in the lander long-term residence scenario. The air release valve is arranged on the upper part of the front hatch for cabin vacuum operation after assembly, so that the internal environment is in a micro-negative pressure state, effectively reducing the humidity in the cabin, improving the air tightness and system stability, and avoiding the moisture of optical and electronic elements. The whole structure on the front hatch is sealed with a circular O-ring, a stepped hatch screw joint surface and a titanium alloy shell material, so that the pressure-resistant cabin body can still maintain excellent mechanical integrity and water tightness performance in a large water depth environment. All interfaces are arranged with standard fixed hole positions and compatible with multiple types of deep-sea platform mounting systems for quick disassembly and field deployment.

[0038] It should be noted that a stable power and data link is established between the main power supply control base and the ROV, HOV or lander, and two groups of peripheral power supply interfaces are arranged for expanding connection with external observation modules or control devices. The four pressure-resistant optical cable through-cabin parts support up to four Raman and fluorescence probes for parallel work to realize time-sharing control and efficient scheduling of multi-point measurement. The LIBS excitation and signal collection adopt a special quartz window direct-through mode to ensure the energy transmission efficiency of high-energy laser excitation and the signal collection quality. In addition, the air release valve is used for vacuum operation in the assembly stage to improve the system sealing performance and running stability, and ensure that the overall system has good platform compatibility, expansion capability and deep-sea environmental adaptability.

[0039] Further, as Figure 4As shown, the Raman and fluorescence probes are connected to the external end of the four-way pressure-resistant optical cable, which can be respectively arranged on the surface of the target area (such as above the fluid jet, hydrate, and sediment). Each probe is integrated with a laser excitation emission optical element and a signal acquisition lens system, has high sensitivity and directivity, supports modular replacement and long-period observation, and is particularly suitable for multi-point control mode deployed on the lander platform.

[0040] As shown, Figures 5-8 The spectral acquisition and analysis module includes a spectrometer and a photon camera. The spectrometer is located in the first cabin body and is the core optical detection device of the system. Signals of three spectral types of Raman, fluorescence, and laser-induced breakdown spectroscopy (LIBS) are collected by the spectrometer in time sharing. The spectrometer is closely connected with external recovery optical fibers and laser-induced breakdown spectroscopy detection windows and other optical path components, is the core hub of multi-modal observation, has a wide spectral response range, high signal-to-noise ratio, and anti-interference capability. The photon camera is closely coupled with the spectrometer and is installed on the exit plane of the spectrometer, is used for converting the split light signals into electrical signals, has high sensitivity and low noise characteristics, and can realize high-quality detection under weak signal conditions. It is equivalent to a photoelectric detection device of the spectrometer, rather than an independent imaging camera. Through the time-gated cooperation of the spectrometer and the photon camera, high-resolution acquisition and digital output of multi-spectral signals can be realized.

[0041] Specifically, the laser emission and excitation module includes a pulsed laser, a pulsed laser power supply unit, and a continuous laser. The pulsed laser is located on the opposite side of the spectrometer, provides a 1064 nm high-energy laser pulse for LIBS measurement, and is connected to the laser-induced breakdown spectroscopy focusing unit in the laser path switching and signal control module through the output end. The laser is emitted outward through the quartz window of the front cabin cover, is used for transient high-energy excitation of the target material surface, has pulse width adjustment, energy stability control, and electrical isolation functions, and guarantees the stability of laser excitation and the safety of deep sea operation. The pulsed laser power supply unit ensures the stability of the energy output of the pulsed laser, has voltage adjustment, pulse width control, and overload protection functions. The continuous laser is arranged in the middle of the first cabin body, provides a 532 nm, 785 nm, or other optional wavelength continuous laser for Raman and fluorescence, is used for Raman and fluorescence excitation, and is connected to the external probe through the four-way channel of the pressure-resistant cable through-cabin piece after fiber coupling through the one-in-four light switching unit of the laser path switching and signal control module. The laser power is adjustable, supports remote control, has laser start or stop protection logic, and realizes multi-channel excitation.

[0042] Specifically, the laser path switching and signal regulation module includes a laser-induced breakdown spectroscopy focusing unit and a one-to-four light switching unit. The laser-induced breakdown spectroscopy focusing unit is located at the output end of the pulsed laser, and is used for collimation, focusing and divergence angle regulation of the LIBS laser beam, so as to ensure that the LIBS excitation energy can be focused on the target area. The light path precision is high, the thermal stability is good, the optical axis directly points to the quartz detection window, and the spectral signal intensity and stability are improved. The one-to-four light switching unit is located between the continuous laser and the pressure-resistant cable penetration part, and is used for switching and scheduling of Raman and fluorescence signals in four channels. It supports time division multiplexing and remote automatic scheduling, and meets the requirements of multi-probe parallel operation and fast polling measurement.

[0043] Specifically, the system control and power supply management module includes a timing signal generator and an external power supply and driving unit. The timing signal generator is located in the central area of the system, and is the trigger and regulation core of each functional unit. It is used for unified coordination of pulsed laser triggering, spectrometer exposure, image acquisition and channel switching processes, so as to ensure the timing consistency of multi-modal and multi-probe collaborative operation. The external power supply and driving unit supplies power to the overall system, has voltage conversion, current distribution and state feedback functions, supports main power supply and peripheral branch management, and can effectively cope with power supply fluctuations and avoid interference between modules in deep sea operation.

[0044] Specifically, the data communication and platform interface module includes a USB-to-network communication unit and a network switch. The USB-to-network communication unit is integrated on the side of the continuous laser, and is used for data and control signal interaction with the ROV or lander system. It supports standard Ethernet protocol, realizes remote parameter setting, running state monitoring and spectral data return of the device, and greatly improves the efficiency and information dimension of deep sea in-situ detection. The network switch is located in the empty area of the first cabin body, and is used to expand the data access of other auxiliary modules of the system, and enhances the multi-task access and task scheduling capability of the system.

[0045] It should be noted that all functional modules form a compact and efficient in-cabin layout with functional interconnection inside the pressure-resistant cabin. The components are reasonably arranged according to the function, and have good pressure resistance, shock resistance and thermal stability, and can be stably operated in deep sea extreme environment for a long time.

[0046] In some embodiments, the system fully considers the mounting requirements of the deep-sea operation platform and the convenience of operation and maintenance in the design stage, has good universality, accessibility and module maintenance capability, and is suitable for various types of deep-sea deployment platforms, including manned submersibles, remote control submersibles and landers. In terms of installation, a standard fixed support and a hoisting hanging point are arranged outside the pressure cabin of the system, and the system can be quickly connected with the platform body through a support or a sliding rail system. All interfaces adopt a mistaken insertion prevention and corrosion prevention structure, and the photoelectric connector layout is clear, so that the equipment inside and outside the cabin can be uniformly plugged. The Raman and fluorescence probes are connected with the cabin through optical fibers, can be independently arranged at different measurement point positions, are adapted to the platform operation arm or the probe arm of the lander, and have high deployment flexibility. In terms of operation and maintenance, the system supports rapid assembly before the task, convenient disassembly and detection after the task, and the four-way pressure optical cable through-cabin part design supports independent replacement and upgrading of the probe. The gas exhaust valve can extract the gas in the cabin after assembly is completed, form a micro-negative pressure environment, inhibit moisture condensation, and thus prolong the service life of optical and electronic elements. The internal functional modules adopt a standardized plug-in design, which is convenient for maintenance, upgrading and replacement, and guarantees the sustainable operation capability of the system under the conditions of high frequency tasks and long-term deployment.

[0047] The embodiment of the present application also provides a use method of the deep-sea in-situ multi-spectral detection system, which is applied to the deep-sea in-situ multi-spectral detection system and includes four steps of cabin-out preparation and system inspection, submersion and deployment, in-situ observation and spectrum switching and data processing.

[0048] In the embodiment, the work flow of the cabin-out preparation and system inspection is as follows:

[0049] 1) After the cabin cover is closed, dry gas is injected into the cabin through the gas exhaust valve to replace water vapor, and after the humidity is reduced to a safe range, the cabin pressure is adjusted to about 80% of the standard atmospheric pressure to form a negative pressure environment and enhance the sealing performance;

[0050] 2) The connection state of the main power supply control base and the external device power supply control sealed base is checked to ensure that all water-tight cable interfaces are tightly inserted and locked well;

[0051] 3) The four-way optical cable is connected to the four-way pressure optical cable through-cabin part, and the other end is connected to the Raman and fluorescence probes;

[0052] 4) It is ensured that the laser-induced breakdown spectroscopy detection window is not blocked and the optical path is clean, and it is confirmed that the window is accurately aligned with the target area;

[0053] The system main cable is connected to the ROV or HOV platform power supply and communication port to ensure that the platform power supply and signal channel are connected.

[0054] In the embodiment, the work flow of the submersion and deployment is as follows:

[0055] 1) The system is lowered to the predetermined operation area as a whole with the ROV, HOV or lander;

[0056] 2) The Raman and fluorescence probes are independently arranged at multiple points (such as hydrothermal vent, cold spring leakage, sediment surface, etc.) according to the task requirements, and are fixed through a support, a mechanical arm or a landing device;

[0057] 3) The laser-induced breakdown spectroscopy detection window is aligned with the target sample surface, and the distance is controlled within a reasonable range.

[0058] In this embodiment, the working process of in-situ observation and spectrum switching is as follows:

[0059] 1) The start instruction is issued through the USB-to-network communication unit;

[0060] 2) The continuous laser outputs excitation light, sequentially selects the current channel through a 1-to-4 light switching unit, and transmits the excitation light to the external probe through the pressure-resistant cable through-cabin part to perform Raman or fluorescence excitation;

[0061] 3) The return signal is sent into the spectrometer through the recovery optical fiber, and the signal conversion is performed by the photon camera;

[0062] 4) The excitation light of the pulsed laser under the set parameters is focused through the laser-induced breakdown spectroscopy focusing unit, irradiates the target area through the laser-induced breakdown spectroscopy detection window, generates plasma emission light, and returns to the spectrometer through the original path.

[0063] In this embodiment, the working process of data processing is as follows: the spectral data is collected by the spectrometer, the photon camera is converted into an electrical signal and is returned to the platform main control system in real time through the USB-to-network communication unit, and the continuous collection, timing sampling or multi-point cyclic observation operation mode can also be set according to the task requirements. According to the collected spectral data, the target components such as H2, CH4, CO2, SO4 2- , Fe, Mn, Zn, Cu and organic matter are identified.

[0064] The beneficial effects of the present application are as follows:

[0065] 1) The titanium alloy cylindrical pressure cabin is adopted, and all optical and electronic modules are packaged inside the sealed cabin; in the actual sea trial process, the system continuously runs for more than 24 hours in the complex environment of high pressure, high humidity and high salinity, and no problems such as water ingress, air leakage and interface failure occur, the sealing performance is stable and reliable, and excellent deep sea environmental adaptability is achieved;

[0066] 2) Integrated Raman spectroscopy, laser-induced breakdown spectroscopy (LIBS) and fluorescence spectroscopy, through laser scheduling, optical switching and spectral co-capture technology, realize the in-situ identification of multiple key substances; the three-spectrum modal function has complementarity, which can cover multiple components from gas, ion, metal to organic molecule, and improves the comprehensive detection capability in deep sea complex environment;

[0067] 3) Through the main power supply control base and the external power supply control sealed base, the compatibility of ROV, HOV, lander and other mainstream deep sea operation platforms is realized; the four-channel pressure-resistant optical cable through-cabin structure supports up to four Raman and fluorescence probes to be laid at the same time, which improves the spatial coverage capability and laying flexibility;

[0068] 4) With USB to network communication function and remote control interface, the laser switch, observation channel switch, acquisition parameter setting and spectrum data back transmission can be controlled by the platform control personnel in real time during the diving process, which can realize real-time data back transmission and cabin storage dual-channel storage, ensuring the integrity and reliability of data acquisition;

[0069] 5) Modular design is adopted, the internal core function modules are all standardized components, which can be quickly disassembled, transported and maintained; the pressure-resistant optical cable, external probe and the like support independent replacement and function extension, which can be flexibly upgraded to a multi-probe synchronous observation system, or integrated with electrochemical sensors, in-situ imaging systems and the like, has good engineering compatibility and system integration potential, improves the maintainability and expansion capability of the system.

[0070] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other.

[0071] In the present application, specific examples are applied to illustrate the principles and implementation modes of the present application, and the above embodiment description is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A deep-sea in-situ multi-spectral exploration system, characterized in that, The utility model relates to a kind of deep-sea laser-induced breakdown spectroscopy detection system, including: Pressure-resistant cabin body and functional module inside cabin body;The pressure-resistant cabin body is composed of main cabin body cylinder section, front cabin cover, rear cabin cover and hoop stiffener, the hoop stiffener is evenly distributed in the outside of the main cabin body cylinder section, to strengthen the pressure strength of the main cabin body cylinder section;Main power supply control pedestal, peripheral power supply control sealed pedestal, laser-induced breakdown spectroscopy detection window, pressure-resistant optical cable cabin-penetrating piece and gas release valve are provided on the front cabin cover; The inside of the main cabin body cylinder section is divided into first cabin body and second cabin body by intermediate partition, and the functional module is arranged on the intermediate partition;The functional module includes: spectrum acquisition and analysis module, laser emitter and excitation module, laser path switching and signal regulation module, system control and power supply management module and data communication and platform interface module.

2. The in-situ multi-spectral deep-sea exploration system according to claim 1, characterized in that, The main power supply control pedestal adopts eight-core waterproof electric connector, is arranged in the center position of the front cabin cover, is used to connect deep-sea special pressure-resistant cable;Peripheral power supply control sealed pedestal is arranged on both sides of the main power supply control pedestal, to provide independent power supply and control signal transmission interface;Laser-induced breakdown spectroscopy detection window is made of thick-wall quartz glass, is located in the lower region of the front cabin cover, and the excitation light of the laser path switching and signal regulation module is emitted through the pressure-resistant quartz glass window;Pressure-resistant optical cable cabin-penetrating piece has four independent channels, and is arranged on the upper edge of the front cabin cover;The gas release valve is arranged on the upper portion of the front cabin cover, for vacuumizing operation to the main cabin body cylinder section;The main power supply control pedestal, the peripheral power supply control sealed pedestal, the laser-induced breakdown spectroscopy detection window, the pressure-resistant optical cable cabin-penetrating piece and the gas release valve all adopt circular O-ring seal.

3. The in-situ multi-spectral deep-sea exploration system according to claim 1, characterized in that, The spectrum acquisition and analysis module includes: spectrometer and photon camera;The spectrometer is located in the first cabin body, is closely connected with the pressure-resistant optical cable cabin-penetrating piece and the laser-induced breakdown spectroscopy detection window, to share spectrum signal acquisition in time-sharing mode;The photon camera is located in the outlet plane of the spectrometer, is closely coupled with the spectrometer, to convert light signal after light splitting into electrical signal.

4. The in-situ multi-spectral deep-sea exploration system according to claim 1, characterized in that, The laser emitter and excitation module includes: pulse laser, pulse laser power supply unit and continuous laser;The pulse laser and the pulse laser power supply unit are both located in the second cabin body, and the pulse laser is connected with the laser path switching and signal regulation module, to provide 1064nm high-energy laser pulse and to carry out instantaneous high-energy excitation to target material surface;The continuous laser is arranged in the middle of the first cabin body, is connected with the pressure-resistant optical cable cabin-penetrating piece, to provide excitation source for Raman and fluorescence.

5. The in-situ multi-spectral deep-sea exploration system according to claim 4, characterized in that, The laser path switching and signal regulation module includes: laser-induced breakdown spectroscopy focusing unit and one-to-four light switching unit;The laser-induced breakdown spectroscopy focusing unit is located in front of the pulse laser, to collimate laser energy and adjust focal point;The one-to-four light switching unit is connected with the continuous laser, to realize switching scheduling of Raman and fluorescence signals.

6. The in-situ multi-spectral deep-sea exploration system according to claim 1, characterized in that, The system control and power supply management module comprises a timing signal generator and an external power supply and driving unit; the timing signal generator is located in the second cabin body; the external power supply and driving unit is located in the second cabin body and used for supplying power for the system.

7. The in-situ multi-spectral deep-sea exploration system according to claim 4, characterized in that, The data communication and platform interface module comprises a USB-to-network communication unit and a network switch; the USB-to-network communication unit is located in the first cabin body and close to the continuous laser, and is used for remote parameter setting, running state monitoring and spectrum data return; the network switch is located in the first cabin body and used for expanding data access of the system.

8. The in-situ multi-spectral deep-sea exploration system according to claim 1, characterized in that, The pressure-resistant cable cabin-penetrating part in which the excitation optical fiber and the recovery optical fiber are embedded, the recovery optical fiber is connected with the external probe, the excitation optical fiber is used for transmitting excitation light, and the recovery optical fiber is used for transmitting Raman and fluorescence signals collected by the external probe; the pressure-resistant cable cabin-penetrating part adopts a metal sealing structure.

9. A method for using the in-situ deep-sea multispectral detection system according to any one of claims 1-8, comprising the steps of: The method comprises the steps of: closing the front cabin cover and injecting dry gas through the air release valve until the humidity is reduced to a safe range, and then adjusting the cabin pressure to 80% of the standard atmospheric pressure; connecting four optical cables with external probes through the pressure-resistant cable cabin-penetrating part; when the system is submerged to the predetermined working area with the lander, excitation light is emitted for Raman or fluorescence excitation, and Raman or fluorescence signals are obtained; signal conversion is performed on the Raman or fluorescence signals; the excitation light of the pulsed laser is focused through the laser-induced breakdown spectroscopy detection window and irradiated on the target area, and plasma emission light is obtained; the Raman or fluorescence signals after signal conversion and the plasma emission light are subjected to spectrum analysis, and detection results are obtained.

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