Novel multipurpose disposable F-P (Fabry-Perot) and grating array multiplexing temperature-depth instrument

Abstract

The invention, which belongs to the technical field of underwater multi-parameter measurement, discloses a novel multipurpose disposable F-P and grating array multiplexing temperature-depth instrument comprising an outflow end shield, the front of the outflow end shield is in threaded connection with an inflow end fairing, and the rear of the outflow end shield is fixedly provided with a stable empennage through a connecting screw. A water inlet is formed in the flow inlet end flow guide cover, a water outlet is formed in the flow outlet end shield, a through water flow channel is formed between the water inlet and the water outlet, a sensing chamber communicated with the water flow channel is formed in the inner side of the flow outlet end shield, and a sensing optical fiber assembly is arranged at the sensing chamber. A fiber outlet matched with the sensing optical fiber assembly is formed in the rear portion of the outflow end shield. The novel multipurpose disposable F-P and grating array multiplexing temperature-depth instrument is simple in overall structure, low in cost and high in sensitivity, can be used in a disposable manner, and can also be used as a towed linear array to dynamically measure ocean temperature-depth data in real time.

Description

Technical Field

[0001] The invention relates to the technical field of underwater multi-parameter measurement, and in particular to a novel multi-purpose disposable FP and grating array multiplexed temperature and depth instrument. Background Art

[0002] The command and decision-making of the naval information system needs to rely on the marine geographical environment such as seabed topography, bottom quality and depth, the marine hydrological environment such as seawater density, ocean currents, temperature, internal waves, mesoscale vortices and sea ice, and the marine hydroacoustic environment such as sound speed, sound speed gradient, marine environmental noise information and convergence areas. This information affects functions such as sea area planning, force planning and combat assessment.

[0003] At present, the detection principle of widely used CTD devices is based on electrical methods. However, the sensors are expensive and not conducive to networking for large-scale monitoring of profiles, which is insufficient to meet the needs of deep-sea exploration and military purposes. Compared with traditional electronic CTD sensors, optical fiber sensors do not need to be preheated or precooled, and can directly measure ocean temperature and depth parameters. The temperature measurement response speed is at the millisecond level, and the ocean temperature and depth profile measurement speed is fast. It is suitable for rapid reconstruction of underwater three-dimensional temperature and depth fields in the ocean, and can realize real-time observation of temperature and depth parameters. Summary of the invention

[0004] The purpose of the present invention is to provide a new type of multi-purpose disposable FP and grating array multiplexed temperature and depth instrument, which has a simple overall structure, low cost and high sensitivity. It can be used as a disposable instrument or as a towed linear array to dynamically measure ocean temperature and depth data in real time.

[0005] To achieve the above-mentioned purpose, the present invention provides a novel multi-purpose disposable FP and grating array multiplexed temperature and depth meter, including an outflow end shield, the front of the outflow end shield is threadedly connected to the inflow end guide shield, the rear of the outflow end shield is fixed with a stabilizing tail by connecting screws, the inflow end guide shield is provided with a water inlet, the outflow end shield is provided with a water outlet, a through water flow channel is formed between the water inlet and the water outlet, a sensing chamber connected to the water flow channel is provided on the inner side of the outflow end shield, an induction optical fiber assembly is provided in the sensing chamber, and a fiber outlet compatible with the induction optical fiber assembly is provided at the rear of the outflow end shield.

[0006] Preferably, the sensing optical fiber assembly comprises a sensing optical fiber, and a front end of the sensing optical fiber is provided with an FBG optical fiber grating and an FP optical fiber reflector located in the sensing chamber.

[0007] Preferably, a fiber winding column is provided inside the outflow end shield, and the sensing optical fiber is spirally wound on the fiber winding column.

[0008] Preferably, the surface of the fiber winding column is provided with threads.

[0009] Preferably, a transmission optical fiber is fused to the rear of the sensing optical fiber, and the transmission optical fiber passes through the fiber outlet and extends to the outside of the outflow end shield.

[0010] Preferably, the structure after the inlet end guide cover and the outlet end shield are connected is streamlined as a whole.

[0011] Preferably, the stabilizing tail wing is annular.

[0012] Therefore, the beneficial effects of the present invention using the above-mentioned novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument are as follows: (1) The present invention has low manufacturing cost, is resistant to electromagnetic interference, and has a simple structure.

[0013] (2) The overall structure of the present invention is divided into three parts, which are detachable, and the actual measurement purpose of the temperature-depth meter can be changed according to actual use.

[0014] (3) The present invention can detect the parameter to be measured using a smaller sensor volume.

[0015] (4) The present invention can dynamically measure ocean temperature and depth data in real time. The sensor serial multiplexing design has the advantages of simultaneous measurement of temperature and pressure data and self-compensation.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument embodiment of the present invention; Figure 2 It is a schematic diagram of the internal structure of an embodiment of a novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument of the present invention.

[0018] Reference numerals 1. Inlet guide cover; 2. Water inlet; 3. Outlet shield; 4. Water outlet; 5. Stabilizing tail fin; 6. Connecting screws; 7. Water flow channel; 8. Sensing chamber; 9. Fiber winding column; 10. Sensing optical fiber; 11. Transmission optical fiber; 12. Fiber outlet; 13. FBG fiber grating; 14. FP fiber reflector. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Embodiment 1 like Figure 1 As shown, the present invention provides a novel multi-purpose disposable FP and grating array multiplexed temperature and depth meter, including an outflow end shield 3, and the front of the outflow end shield 3 is threadedly connected with the inflow end guide cover 1, which is convenient for disassembly. A stabilizing tail 5 is fixed to the rear of the outflow end shield 3 by connecting screws 6, which is used to stabilize the posture of the temperature and depth meter, and is also convenient for disassembly. The structure after the inflow end guide cover 1 and the outflow end shield 3 are connected is streamlined as a whole, and the stabilizing tail 5 is annular, and the number and size of the rings can be designed and adjusted as needed. In this embodiment, the stabilizing tail 5 is a three-annular ring structure.

[0022] like Figure 2 As shown, a water inlet 2 is provided on the flow guide cover 1 at the inlet end, a water outlet 4 is provided on the protective cover 3 at the outlet end, a water flow channel 7 is formed between the water inlet 2 and the water outlet 4, a sensing chamber 8 connected with the water flow channel 7 is provided on the inner side of the protective cover 3 at the outlet end, an induction optical fiber assembly is provided in the sensing chamber 8, so that the induction optical fiber assembly can be in contact with water, and a fiber outlet 12 adapted to the induction optical fiber assembly is provided at the rear of the protective cover 3 at the outlet end.

[0023] The sensing optical fiber assembly includes a sensing optical fiber 10, and the front end of the sensing optical fiber 10 is provided with a FBG optical fiber grating 13 and a FP optical fiber reflector 14 located in the sensing chamber 8. A fiber winding column 9 is provided inside the outflow end shield 3, and a thread is provided on the surface of the fiber winding column 9. The sensing optical fiber 10 is spirally wound on the fiber winding column 9, and local sensitivity enhancement treatment is performed by spiral winding, which is conducive to improving the detection accuracy.

[0024] A transmission optical fiber 11 is fused to the rear of the sensing optical fiber 10. The transmission optical fiber 11 passes through the fiber outlet 12 and extends to the outside of the outflow end shield 3. It can be connected to the dry end demodulation system for demodulation to measure the information to be measured.

[0025] Working principle: The temperature and depth meter is placed in water. Water can flow into the sensing chamber 8 through the water inlet 2 and the water flow channel 7, and then flow out from the water outlet 4 after contacting the sensing optical fiber assembly. After the sensing optical fiber assembly actually contacts the water, the parameter information to be measured in the water can be measured in real time. The light source is connected to the sensing optical fiber 10 of the sensing optical fiber assembly through the transmission optical fiber 11. After transmission, it reaches the sensing optical fiber 10, first passes through the FBG optical fiber grating 13, and a part of the light near the reflection wavelength of the FBG optical fiber grating 13 is reflected. The remaining part of the transmitted light is incident on the FP optical fiber reflector 14, and its reflection spectrum is a low-contrast Fabry-Perot cavity interference spectrum. It passes through the FBG optical fiber grating 13 again, and its transmitted part is superimposed with the previous FBG optical fiber grating 13 reflected light to form the final return spectrum, which is finally demodulated by the dry-end demodulation system to obtain the final measurement information.

[0026] The overall structure of the temperature and depth instrument is streamlined, the inlet end guide cover 1 is semi-elliptical, the outlet end shield 3 is arc-shaped, and the stabilizing tail 5 is designed as three circular ring structures, which are used to cope with the influence of lateral ocean currents during use, and can also ensure that the temperature and depth instrument remains stable as a whole during the fall. Water flows in from the water inlet 2, flows along the water flow channel 7 to the sensor chamber 8, and then flows out from the water outlet 4 along the water flow channel 7, which can ensure that the sensing optical fiber component can detect the external water flow parameter information in real time.

[0027] After the sensing optical fiber 11 extends to the outside through the fiber outlet 12, if it is used in large quantities, the dry end connecting optical fiber can be directly cut short and the temperature depth meter can be directly discarded. The FBG fiber grating 13 and FP fiber reflector 14 in the sensing chamber 8 can be replaced according to the specific use purpose. It only needs to directly cut the sensing optical fiber 10 on the fiber column 9, use a fiber fusion splicer to melt the required FBG fiber grating and FP fiber reflector, and then place them in the sensing chamber 8.

[0028] Therefore, the present invention adopts the above-mentioned new type of multi-purpose disposable FP and grating array multiplexing temperature and depth instrument, which has a simple overall structure, low cost and high sensitivity. It can be used as a disposable instrument or as a towed linear array to dynamically measure ocean temperature and depth data in real time.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A new type of multi-purpose disposable FP and grating array multiplexing temperature and depth instrument, characterized by: It includes an outflow end shield, the front of which is threadedly connected to an inlet end flow guide shield, the rear of which is fixed with a stabilizing tail wing by connecting screws, the inlet end flow guide shield is provided with a water inlet, the outflow end shield is provided with a water outlet, a through water flow channel is formed between the water inlet and the water outlet, a sensor chamber connected to the water flow channel is provided on the inner side of the outflow end shield, an induction optical fiber assembly is provided in the sensor chamber, and a fiber outlet matched with the induction optical fiber assembly is provided at the rear of the outflow end shield.

2. A novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument according to claim 1, characterized in that: The sensing optical fiber assembly comprises a sensing optical fiber, and a front end of the sensing optical fiber is provided with an FBG optical fiber grating and an FP optical fiber reflector located in the sensing chamber.

3. A novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument according to claim 2, characterized in that: A fiber winding column is arranged inside the outflow end shield, and the sensing optical fiber is spirally wound on the fiber winding column.

4. A novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument according to claim 3, characterized in that: The surface of the fiber winding column is provided with threads.

5. A novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument according to claim 2, characterized in that: A transmission optical fiber is fused to the rear of the sensing optical fiber, and the transmission optical fiber passes through the fiber outlet and extends to the outside of the outflow end shield.

6. The novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument according to claim 1, characterized in that: The structure after the inlet end guide cover and the outlet end shield are connected is streamlined as a whole.

7. The novel multi-purpose disposable FP and grating array multiplexing temperature and depth instrument according to claim 1, characterized in that: The stabilizing tail wing is annular.

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