JPH0953932A - Tide level follow-up sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tide level follow-up sensor which can be disposed closely to the surface of the sea by providing a wire extending from the lower surface of a float through the first through the third pulleys to a rod and connected to the lower end thereof. SOLUTION: The upper end of a vertically extending pipe 2 is secured to the upper part of a platform 1 and a float 4a is disposed in the pipe 2 with a wire 5 being fixed to the lower surface thereof. The wire 5 takes a U-turn at pulley 6, and goes through 6a, 6b, and passes through the outside of a guide pipe 8 before being fixed to the lower end of a rod 7. The float 4a has a buoyancy for balancing the rod 7 at a predetermined draft and the length of wire 5 is set so that a sensor 9 is located at a predetermined depth under the water surface when the float 4a is at that draft. Water level in the pipe 2 is varied depending on the tide level but it is substantially insusceptible to the swell. Since the rod 7 connected with the wire 5 is also invariant, the sensor 9 can be disposed constantly at a predetermined position under the surface of the sea.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tide level tracking type sensor device applied to a stationary platform used in marine surveys.

[0002]

2. Description of the Related Art FIG. 5 shows a sensor device installed on a conventional stationary platform. A vertical guide rail 10 is attached to the top of the platform 1. The float 4 having the sensor 9 on the lower surface moves along the guide rail 10. Then, the sensor 9 measures the data at a predetermined position in the seawater 01.

[0003]

According to the above-mentioned conventional method, when the tide level changes, the sensor follows the float, but it is also swung up and down due to waves and swells. Therefore, when acquiring data at a predetermined position below the sea level. I couldn't get enough accuracy.

[0004]

The present invention employs the following means to solve the above-mentioned problems.

That is, as a tide level tracking type sensor device,
A pipe having an upper end attached to the upper part of the platform in the vertical direction, a guide pipe provided in the upper part of the platform parallel to the pipe, and a rod having a sensor at the lower end movably arranged in the guide pipe. A first sheave provided near the inside of the lower end of the pipe, second and third sheaves provided on the platform above the pipe and guide pipe, and a float arranged in the pipe , A wire connected from the lower surface of the float to the lower end of the rod through the first pulley, the second pulley and the third pulley.

In the above, the float has a buoyancy force that balances with the rod at the time of predetermined water-washing. The length of the wire is such that the sensor will reach a predetermined depth below the surface of the water when the float is in a predetermined amount of water.

The water level in the pipe changes according to the tide level, but it hardly changes depending on the wave swell. Therefore, since the wire-connected rod does not change, the sensor is always placed at a predetermined position below the sea level.

In this way, the data can be accurately measured by the sensor at a predetermined position below the sea level at each tide level.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, an upper end of a pipe 2 oriented vertically is attached to an upper part of a platform 1. The lower end thereof is located in the sea 01 so that it is hardly affected by the waves, and the filter 3 for preventing marine life, suspended matter, etc. is attached thereto. A guide pipe 8 is attached to the top of the platform 1 parallel to the pipe 2. A pulley 6 is attached near the inside of the lower end of the pipe 2. A pulley 6a is attached to the upper part of the platform 1 above it. Further, a pulley 6b is attached to the upper part of the platform 1 above the guide pipe 8.

A rod 7 is passed through the guide pipe 8, and a sensor 9 is attached to the lower end of the guide pipe 8 via an attachment frame. As shown in FIG.
The output of is guided by the cable 13 along the rod 7 to the upper end as shown in FIG. 4, and is connected to the antenna 14 at the upper end of the platform 1.

A float 4a is provided in the pipe 2, and a wire 5 is attached to the lower surface of the float 4a. The wire 5 passes through the outside of the guide pipe 8 through the pulleys 6a and 6b by making a U-turn in the pulley 6, and is attached to the lower end of the rod 7.

In the above, as shown in FIG. 2, the float 4a has a buoyancy force that balances with the rod 7 when the water is dipped for a predetermined period of time. Further, the length of the wire 5 is set such that the sensor 9 comes to a predetermined depth below the water surface when the float 4a is in the water-draining h.

The water level a in the pipe 2 changes according to the tide level, but hardly changes due to the wave swell. Therefore, since the rod 7 connected by the wire 5 does not change,
The sensor 9 is always arranged at a predetermined position below the sea surface.

The data measured by the sensor 9 is transmitted by VHF to the ground station via the antenna 14.

Considering, for example, a velocity sensor using ultrasonic waves as the sensor 9, which acquires data from the position of the sensor to the water bottom, regardless of the tide level, wave, and swell,
Data from the bottom of the water to near the surface of the water can always be acquired.

As described above, the data can be accurately measured by the sensor 9 at a predetermined position below the sea level at each tide level.

[0018]

According to the present invention as described above,
Sensors can be placed near the sea surface without being affected by waves, swells, etc. in the sea where the tide changes.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a detailed view of a float unit having the same configuration.

FIG. 3 is a detailed view of a sensor unit having the same configuration.

FIG. 4 is a detailed view of an upper end portion of the rod having the same configuration.

FIG. 5 is an overall configuration diagram of a conventional example.

[Explanation of symbols]

 1 Platform 2 Pipe 3 Filter 4, 4a Float 5 Wire 6, 6a, 6b Pulley 7 Rod 8 Guide pipe 9 Sensor 10 Guide rail 12 Mounting frame 13 Signal cable 14 Antenna

Claims (1)

[Claims] 1. A pipe having an upper end attached to the upper part of the platform in the vertical direction, a guide pipe provided in the upper part of the platform parallel to the pipe, and movably arranged in the guide pipe at the lower end. A rod having a sensor, a first pulley provided near the inside of the lower end of the pipe, second and third pulleys provided on the platform above the pipe and the guide pipe, and in the pipe With the float placed,
A tide level tracking type sensor device comprising: a wire connected from a lower surface of the float to a lower end portion of the rod through the first pulley, the second pulley and the third pulley.