End window type marine chlorophyll in-situ monitoring device

Abstract

The invention discloses an end window type marine chlorophyll in-situ monitoring device, which belongs to the technical field of marine chlorophyll monitoring, and comprises a watertight joint, an upper end cover, an outer cylinder and a window monitoring lower end cover structure, and the upper end cover and the window monitoring lower end cover structure are respectively arranged at the upper end and the lower end of the outer cylinder. By adopting the ring window design, the problems of non-uniform gluing in the gluing process of the porous design and difficult disassembly of the glued porous structure can be avoided. The design that wedge-shaped sealing is combined with O-shaped ring sealing can guarantee the deep-sea high-strength sealing performance, and meanwhile high anti-corrosion capacity is achieved. The overall size of the instrument can meet the requirements of miniaturization and light weight of ocean chlorophyll in-situ monitoring instruments of mobile platforms such as Argo, underwater gliders and the like, and the instrument can also be manually lifted with wires to be thrown into water for monitoring and shipborne underway monitoring.

Description

Technical Field

[0001] The invention belongs to the technical field of marine chlorophyll monitoring, and in particular relates to an end-window type marine chlorophyll in-situ monitoring device. Background Art

[0002] At present, the chlorophyll monitoring equipment on the domestic market still faces the problems of large size, high power consumption and low sensitivity; it is difficult to meet the needs of in-situ monitoring of marine chlorophyll on mobile platforms such as Argo and underwater gliders. The gluing process used in the optical monitoring windows of most foreign miniaturized chlorophyll monitoring equipment is not easy to disassemble and has high requirements for the choice of glue. The optical windows glued with ordinary glue are easily softened and fall off after being immersed in marine conditions for a long time, which affects the service life of the instrument.

[0003] In order to solve the above problems, it is of great significance to design a miniaturized instrument optomechanical structure with small size, strong pressure resistance, high detection sensitivity, which can meet the needs of in-situ monitoring of marine chlorophyll on mobile platforms such as Argo and underwater gliders, and does not use adhesive sealing. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides an end-window type marine chlorophyll in-situ monitoring device which has the advantages of small size, strong pressure resistance and high detection sensitivity, and can meet the needs of marine chlorophyll in-situ monitoring on mobile platforms.

[0005] The present invention is achieved through the following technical solutions: An end-window type marine chlorophyll in-situ monitoring device comprises a watertight joint, an upper end cover, an outer cylinder and a window monitoring lower end cover structure; The upper end cover and the window monitoring lower end cover structure are respectively arranged at the upper end and the lower end of the outer cylinder, and the upper end cover is provided with a watertight joint; The window monitoring lower end cover structure includes an upper pressure cover plate, a cavity seat, a lower pressure cover plate, a receiving end window, a filter, a photomultiplier tube, an excitation end window, an LED lamp bead and an LED control PCB board; A through central cavity and a connected trapezoidal cavity and a sloped cavity formed around the central cavity are formed at the center of the cavity seat; the receiving end window is arranged in the central cavity, and a filter and a photomultiplier tube are arranged above it; the excitation end window is arranged in the trapezoidal cavity, and the LED lamp bead is arranged in the sloped cavity; the upper pressure cover plate and the lower pressure cover plate are arranged at the upper end and the lower end of the cavity seat, and the LED control PCB board is arranged on the upper pressure cover plate and connected to the LED lamp bead.

[0006] In the above technical solution, a filter mounting seat is arranged on the upper end of the receiving end window, and the filter is arranged on the filter mounting seat.

[0007] In the above technical solution, a circuit board support column is arranged on the upper pressure cover plate, and the LED control PCB board is fixedly mounted on the circuit board support column by circuit board fixing screws.

[0008] In the above technical solution, the window monitoring lower end cover structure also includes a sealing structure, which includes a receiving end window wedge seal, an excitation end window wedge seal, a bottom transverse sealing ring and an outer radial sealing ring. The receiving end window wedge seal is arranged at the connection between the upper end of the receiving end window and the central cavity, the excitation end window wedge seal is arranged at the connection between the outer side of the lower end of the excitation end window and the trapezoidal cavity, the bottom transverse sealing ring is arranged at the connection between the upper end surface of the excitation end window and the trapezoidal cavity, and the outer radial sealing ring is arranged at the middle of the outer wall of the cavity seat.

[0009] In the above technical solution, the material of the outer radial sealing ring and the bottom transverse sealing ring is fluororubber, and the material of the exciting end window wedge seal and the receiving end window wedge seal is polytetrafluoroethylene.

[0010] In the above technical solution, a groove is provided at the outer edge of the LED control PCB board for welding the connecting wires of the LED lamp beads.

[0011] In the above technical solution, the number of the LED lamp beads is 10.

[0012] Beneficial effects: 1. In terms of structure: First, the structure of the optical window monitoring part is designed to be separated, which is convenient for assembly, reduces the difficulty of assembly, and prevents the excitation light from scattering into the receiving window and affecting the monitoring results; the instrument is multi-band LED excitation, which requires multiple LED lamp beads. The ring window design can avoid the problem of uneven bonding during the bonding process of the porous design, and the problem that the bonded porous structure is difficult to disassemble.

[0013] 2. Sealing and pressure-resistant design: (1) Sealing: The wedge seal combined with the O-ring seal design can ensure high-strength sealing in the deep sea while having high corrosion resistance. (2) Pressure-resistant design: In the contact part between the designed optical lens and the base, the base is cleaned and chamfered, and the optical glass is chamfered to avoid stress concentration during the pressure process.

[0014] 3. Usage: The overall size of the instrument can meet the miniaturization and lightweight requirements of marine chlorophyll in-situ monitoring instruments on mobile platforms such as Argo and underwater gliders. It can also be used for manual monitoring by dropping it into the water with a line and for shipborne monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in describing the embodiments are briefly introduced below.

[0016] Figure 1 The figure is a schematic diagram of the overall structure of an end-window type marine chlorophyll in-situ monitoring device of the present invention.

[0017] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of the lower end cover structure of the window monitoring in an end-window type marine chlorophyll in-situ monitoring device.

[0018] Figure 3 The present invention is a schematic cross-sectional structural diagram of a window monitoring lower end cover structure in an end window type marine chlorophyll in-situ monitoring device.

[0019] Figure 4 This is a diagram of the 50Mpa pressure simulation results of the window monitoring lower end cover structure in an end window type marine chlorophyll in-situ monitoring device of the present invention.

[0020] Figure 5 This is a diagram of measurement results of the use of an end-window type marine chlorophyll in-situ monitoring device of the present invention.

[0021] Among them, 1 is the receiving end window, 2 is the excitation end window, 3 is the excitation end window wedge seal, 4 is the lower pressure cover, 5 is the cavity seat, 6 is the outer radial sealing ring, 7 is the LED lamp bead, 8 is the upper pressure cover, 9 is the LED control PCB board, 9-1 is the groove, 10 is the photomultiplier tube, 11 is the filter, 12 is the circuit board fixing screw, 13 is the circuit board support column, 14 is the filter mounting seat, 15 is the receiving end window wedge seal, 16 is the bottom transverse sealing ring, 17 is the outer cylinder, 18 is the upper end cover, and 19 is the watertight joint. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Example: like Figures 1 to 3 As shown, this embodiment provides an end-window type marine chlorophyll in-situ monitoring device, including: a receiving end window 1, an excitation end window 2, an excitation end window wedge seal 3, a lower pressure cover plate 4, a cavity seat 5, an outer radial sealing ring 6, an LED lamp bead 7, an upper pressure cover plate 8, an LED control PCB board 9, a photomultiplier tube 10, a filter 11, a circuit board fixing screw 12, a circuit board support column 13, a filter mounting seat 14, a receiving end window wedge seal 15, a bottom transverse sealing ring 16, an outer cylinder 17, an upper end cover 18, and a watertight joint 19.

[0024] The bottom transverse sealing ring 16 is placed in the circular groove of the cavity seat 5, the excitation end window 2 is concentrically assembled with the internal cylinder of the lower pressure cover plate 4, and the excitation end window wedge seal 3 is installed in the trapezoidal space reserved by the excitation end window 2 and the cavity seat 5; the height of the excitation end window wedge seal 3 is 2.63mm, which is about 0.5mm higher than the end face of the excitation end window 2, and 12 through-hole interfaces are evenly distributed on the lower pressure cover plate 4 and correspond concentrically to the threaded interfaces on the end face of the cavity seat 5. During the extrusion process, the screw is turned by an inner hexagonal wrench to drive the lower pressure cover plate 4 to extrude the excitation end window wedge seal 3, and the sealing is completed when the lower pressure cover plate 4 is flush with the end face of the cavity seat 5. At the same time, when the screw is turned to drive the lower pressure cover plate 4 to extrude the excitation end window wedge seal 3, the excitation end window 2 is also extruding the bottom transverse sealing ring 16.

[0025] The receiving end window 1 is assembled concentrically with the inner groove of the cavity seat 5, and in order to ensure the pressure-bearing of the squeeze seal, the end face of the cavity seat 5 extends out of a single-side 1mm step; the receiving end window wedge seal 15 is installed in the trapezoidal space reserved by the receiving end window 1 and the inner cavity of the cavity seat 5, and the height of the receiving end window wedge seal 15 is 2.63mm, which is about 0.5mm higher than the end face of the receiving end window 1. The filter mounting seat 14 squeezes the receiving end window wedge seal 15 through threaded rotation, and the sealing is completed when the upper surface of the filter mounting seat 14 is flush with the upper end face of the receiving end window; the four through holes on the upper end of the upper cover plate 8 correspond concentrically to the threaded interface of the photomultiplier tube 10 and are fixed through threaded connection. The filter 11 is assembled concentrically with the filter mounting seat 14; the upper pressure cover plate 8 is fixed to the upper end surface of the cavity seat 5 by threaded connection; three circuit board support columns 13 pass through the upper pressure cover plate 8 and are fixed to the upper end surface of the cavity seat 5, and the LED control PCB board 9 is placed on the three circuit board support columns 13 and fixed by the circuit board fixing screws 12; 10 LED lamp beads are obliquely inserted into the inclined cavity of the cavity seat 5, and are fixed in the outer groove 9-1 of the LED control PCB board 9 by solder wire.

[0026] To ensure sealing during the extrusion process and to adapt to the seawater environment, the outer radial sealing ring 6 and the bottom transverse sealing ring 16 are made of fluororubber, and the excitation end window wedge seal 3 and the receiving end window wedge seal 15 are made of polytetrafluoroethylene.

[0027] The designed end-window water algae excitation fluorescence spectrum in-situ sensor was simulated at 50Mpa pressure, and the results are as follows: Figure 4 As shown in the figure, the maximum deformation is 0.576mm. At the wedge seal between the lower cover plate and the excitation end window, the compression excitation end window wedge seal is flush with the excitation end window, and the maximum deformation of the rest is 0.0576mm. It meets the design requirements and can meet the working requirements of 5000m deep sea.

[0028] Usage process: The instrument is connected to the watertight joint of the instrument through a connector to realize power supply and communication. The instrument can be fixed on mobile platforms such as Argo and underwater gliders for profile monitoring, and can be directly carried into the water for monitoring and shipborne monitoring. During the instrument measurement process, the floating algae are first induced to radiate fluorescence through a multi-band excitation light source. The algae fluorescence is collected by the photomultiplier tube through the collection light window, and then the signal is filtered and amplified by the fluorescence signal detection circuit. It is used as input to participate in the aliasing spectrum analysis algorithm and then output by the host computer software. The chlorophyll concentration and community structure of the algae. The specific measurement results are as follows: Figure 5 As shown, it can be concluded from the figure that the device can collect the chlorophyll concentration of algae at a series of time points.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An end-window type marine chlorophyll in-situ monitoring device, characterized in that: It includes a watertight joint, an upper end cover, an outer cylinder and a window monitoring lower end cover structure; The upper end cover and the window monitoring lower end cover structure are respectively arranged at the upper end and the lower end of the outer cylinder, and the upper end cover is provided with a watertight joint; The window monitoring lower end cover structure includes an upper pressure cover plate, a cavity seat, a lower pressure cover plate, a receiving end window, a filter, a photomultiplier tube, an excitation end window, an LED lamp bead and an LED control PCB board; A through central cavity and a connected trapezoidal cavity and a sloped cavity formed around the central cavity are formed at the center of the cavity seat; the receiving end window is arranged in the central cavity, and a filter and a photomultiplier tube are arranged above it; the excitation end window is arranged in the trapezoidal cavity, and the LED lamp bead is arranged in the sloped cavity; the upper pressure cover plate and the lower pressure cover plate are arranged at the upper end and the lower end of the cavity seat, and the LED control PCB board is arranged on the upper pressure cover plate and connected to the LED lamp bead.

2. The end-window type marine chlorophyll in-situ monitoring device according to claim 1, characterized in that: A filter mounting seat is arranged at the upper end of the receiving end window, and the filter is arranged on the filter mounting seat.

3. The end-window type marine chlorophyll in-situ monitoring device according to claim 1, characterized in that: The upper cover plate is provided with a circuit board support column, and the LED control PCB board is fixedly mounted on the circuit board support column by circuit board fixing screws.

4. The end-window type marine chlorophyll in-situ monitoring device according to claim 1, characterized in that: The window monitoring lower end cover structure also includes a sealing structure, which includes a receiving end window wedge seal, an excitation end window wedge seal, a bottom transverse sealing ring and an outer radial sealing ring. The receiving end window wedge seal is arranged at the connection between the upper end of the receiving end window and the central cavity, the excitation end window wedge seal is arranged at the connection between the outer side of the lower end of the excitation end window and the trapezoidal cavity, the bottom transverse sealing ring is arranged at the connection between the upper end surface of the excitation end window and the trapezoidal cavity, and the outer radial sealing ring is arranged in the middle of the outer wall of the cavity seat.

5. The end-window type marine chlorophyll in-situ monitoring device according to claim 4, characterized in that: The material of the outer radial sealing ring and the bottom transverse sealing ring is fluororubber, and the material of the exciting end window wedge seal and the receiving end window wedge seal is polytetrafluoroethylene.

6. The end-window type marine chlorophyll in-situ monitoring device according to claim 1, characterized in that: The outer edge of the LED control PCB board is provided with a groove for welding the connecting wires of the LED lamp beads.

7. The end-window type marine chlorophyll in-situ monitoring device according to claim 1, characterized in that: The number of the LED lamp beads is 10.

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