CN203375991U - Combined sound pressure and hydraulic pressure sensor - Google Patents

Abstract

The utility model provides a combined sound pressure and hydraulic pressure sensor, which aims at providing the combined sensor with small size, deep water resistance, high sensitivity and resistance to complex sea conditions as required by sea monitoring buoys. The sensor mainly comprises a cable head, a sound pressure hydrophone, a pressure sensor, a diversion block, an inner casing, a water density layer and a stretching resistance multi-core thin cable. The maximal diameter of the whole combined sensor is 26mm, and the height of the sensor is 115mm. The combined sensor has the advantages that pressure signals and sound pressure signals can be simultaneously obtained; the maximal stretching resistance is 200kg, and the water depth resistance is 3000m; and the size is small, and the combined sensor can be applied to different types of buoys.

Description

A combination sensor of sound pressure and water pressure

technical field

The utility model belongs to the technical field of marine environment monitoring, in particular to a combined sensor capable of simultaneously measuring sound pressure and water pressure in seawater.

Background technique

A drifting buoy is a buoy that can continuously monitor a wide range of marine environmental noise along with ocean currents. The buoy generally includes a hydrophone for measuring sound pressure in water and a pressure sensor for measuring an absolute pressure value for the depth positioning of the sensor. If the hydrophone and the pressure sensor cannot be integrated as a whole, there will be some disadvantages: 1. In terms of weight, the weight of the two sensors after vulcanization will be much greater than the weight of the combined sensor; 2. The structural complexity will be greatly increased. It is not conducive to the underwater release of buoy cables and sensors; three, the possibility of sensor water leakage is increased. Therefore, there is an urgent need for combined sensors that are small, deep-water resistant, high-sensitivity, and resistant to complex sea conditions.

Contents of the invention

The purpose of this utility model is to solve the above problems. By designing a special vulcanization mold and repeatedly testing the arrangement of the sensor and the pre-amplifier circuit, a sound pressure water heater can be provided with the minimum structural weight, volume overhead and self-interference. pressure combination sensor.

The technical solution adopted by the utility model: a sound pressure and water pressure combination sensor, mainly including a cable head, a sound pressure hydrophone, a pressure sensor, a diversion block, a pressure block, an inner shell, a watertight layer and a tensile multi-core cell The cable also includes a small load-bearing part used to fix the strong rope in the cable. The strong rope in the cable is wound on the load-bearing part by squeezing each other to ensure that the strong rope is evenly stressed and does not slip, ensuring that the tension After the pressure sensor, the inner shell, and the pressure block act on the strong rope, the cable core wire and the watertight layer are protected. After the strong rope is fixed on the load-bearing part, it is loaded into the cable head, and the inner shell and the pressure sensor are connected through threads. Connection, the inner shell and the pressure block are rigidly connected by screws, the cable head and the pressure block are rigidly connected by screws, the sound pressure hydrophone and the pressure sensor are watertight by perfusion or vulcanization, and the cable head and the cable connection are watertight by vulcanization, And install the guide block to reduce the flow noise of the sound pressure sensor. The maximum diameter of the entire combined sensor is 26mm and the height is 115mm.

As a preference, the sound pressure hydrophone adopts PZT-5 piezoelectric material, two piezoelectric ceramic circular tubes with opposite polarizations are connected in series, the height of a single piezoelectric ceramic circular tube is 10mm, the inner diameter is 12mm, and the wall thickness is 2mm. Ceramic gaskets are used between the round tubes, the inner shell and the pressure sensor.

Preferably, a titanium alloy is used to make the inner shell, the bearing part, the pressing block and the cable head.

The utility model can bring the following beneficial effects:

1. Acquire pressure signal and sound pressure signal at the same time.

2. The maximum tensile resistance is 200kg, and the water depth is 3000m.

3. Small size, can be applied to various types of buoys.

Description of drawings:

Figure 1 Outline drawing of sound pressure and water pressure combined sensor;

Figure 2 Sectional view of sound pressure water pressure combined sensor;

Figure 3 is the sensitivity curve of the sound pressure hydrophone;

Explanation of reference numerals: cable head 1 , sound pressure hydrophone 2 , pressure sensor 3 , diversion block 4 , bearing member 5 , pressure block 6 , inner shell 7 , and piezoelectric ceramic circular tube 8 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further introduced:

The sound pressure hydrophone 2 of the present invention adopts PZT-5 type piezoelectric material, and two piezoelectric ceramic circular tubes 8 with opposite polarizations are connected in series. The single piezoelectric ceramic circular tube 8 has a height of 10mm, an inner diameter of 12mm, and a wall thickness of 2mm. Ceramic gaskets are used between the tubes 8 and between the inner shell 7 and the pressure sensor 3 . The cable head 1, the bearing part 5, the pressure block 6 and the inner shell 7 are made of metal titanium alloy, and are cleaned before use. The inner shell 7 and the pressure sensor 3 are connected by threads, and the inner shell 7 and the pressing block 6, and the pressing block 6 and the cable head 1 are connected by bolts. The strong rope in the cable is wound on the load-bearing member 5 by squeezing each other, so as to ensure that the strong rope bears force evenly and does not slip. The cable head is vulcanized into a cone shape, and the guide block 4 is installed.

Assemble the prepared components in the following order:

1. Connect the inner shell 7 to the pressure sensor 3 through threads, and apply epoxy adhesive on the joint.

2. Put the piezoelectric ceramic round tube 8 and the gasket welded with wires on the inner shell 7, and bond them with epoxy adhesive. After the epoxy is cured, the two piezoelectric ceramic circular tubes 8 are connected in series, and the preamplifier board is put into the inner shell 7, and the lead wires are reserved.

3. The sound pressure hydrophone 2 is shielded with 200-mesh copper mesh and then poured with polyurethane for the first time.

4. After the signal detection is normal, perform watertight vulcanization or the second polyurethane perfusion.

5. Install the cable head 1 with load-bearing measures.

The lake test measurement was carried out on the combination sensor of sound pressure and water pressure, and the results are shown in the table:

Table 1001# buoy noise measurement results

The voltage receiving sensitivity of the sound pressure hydrophone is -177±2dB (0dB=1V/μPa), and the sensitivity curve is shown in Figure 3.

Standard pressure gauge reading buoy measurement results 0 0 17.8 17 35.4 35 43.4 43 78.8 78 122 121 150 150

Table 2001# buoy depth measurement results

The above description of the utility model is not restrictive. If a person of ordinary skill in the art is inspired by it, and does not depart from the protection of the utility model claims, make other structural deformations and implementations of the utility model, which all belong to this utility model. Protection scope of utility model.

Claims (3)

1. A combined sound pressure and water pressure sensor, characterized in that it mainly includes a cable head (1), a sound pressure hydrophone (2), a pressure sensor (3), a diversion block (4), and a pressure block (6) , an inner shell (7), a watertight layer and a multi-core thin cable with tensile strength, and also includes a small load-bearing part (5) for fixing the strong rope in the cable, and the strong rope in the cable is wound by mutual extrusion On the load-bearing parts, ensure that the strong rope is evenly stressed and does not slip, and ensure that the tension acts on the strong rope after passing through the pressure sensor (2), the inner shell (7) and the pressure block (6), and then exerts force on the cable core wire and The watertight layer is used for protection. After the force-bearing member (5) is fixed with a strong rope, it is loaded into the cable head (1). The inner shell (7) and the pressure sensor (2) are connected by threads. The inner shell (7) and the pressing block (6) Rigid connection by screws, cable head (1) and pressure block (6) are rigidly connected by screws, sound pressure hydrophone (2) and pressure sensor (3) are watertight by perfusion or vulcanization, cable head ( 1) The connection with the cable is vulcanized for watertightness, and a flow guide block (4) is installed to reduce the flow noise of the sound pressure sensor. The maximum diameter of the entire combined sensor is 26mm and the height is 115mm. 2. A combination sound pressure and water pressure sensor according to claim 1, characterized in that: the sound pressure hydrophone (2) uses PZT-5 piezoelectric material, and two piezoelectric ceramic circles with opposite polarizations The tubes (8) are connected in series, the height of a single piezoelectric ceramic tube is 10mm, the inner diameter is 12mm, and the wall thickness is 2mm. Ceramic gaskets are used between the piezoelectric ceramic tubes (8) and between the inner shell (7) and the pressure sensor (3). 3. A combined sound pressure and water pressure sensor according to claim 1, characterized in that: the cable head (1), bearing member (5), pressing block (6) and inner shell (7) adopt Made of titanium alloy material.

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