KR20170068181A - Fluid level detecting system of cargo tank and draft detecting system of the vessel - Google Patents

Fluid level detecting system of cargo tank and draft detecting system of the vessel Download PDF

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Publication number
KR20170068181A
KR20170068181A KR1020150175078A KR20150175078A KR20170068181A KR 20170068181 A KR20170068181 A KR 20170068181A KR 1020150175078 A KR1020150175078 A KR 1020150175078A KR 20150175078 A KR20150175078 A KR 20150175078A KR 20170068181 A KR20170068181 A KR 20170068181A
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KR
South Korea
Prior art keywords
optical fiber
light
fluid storage
measurement
measurement system
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Application number
KR1020150175078A
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Korean (ko)
Inventor
최성희
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대우조선해양 주식회사
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Priority to KR1020150175078A priority Critical patent/KR20170068181A/en
Publication of KR20170068181A publication Critical patent/KR20170068181A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
    • G01F23/2924—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms for several discrete levels, e.g. with more than one light-conducting sensing element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/12—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for indicating draught or load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

A fluid level measurement system for a fluid storage tank according to the present invention includes a light source for emitting measurement light, an optical fiber cluster for transmitting light from the light source to a measurement point through an optical fiber, a photodetector for detecting reflected light from the optical fiber cluster, According to the measuring system of the present invention, since the signal processing device for processing the light detected by the photodetector, the measurement system of the present invention can be applied irrespective of the position to be measured, sufficient accuracy can be assured in measurement, It is easy to set the accuracy and it is applicable to the measurement of the level of the fluid storage tank and the draft of the ship which are important measurement items in the ship.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid level measurement system for a fluid storage tank and a draft measurement system for a ship,

The present invention relates to a system for measuring the level of a fluid stored in a fluid storage tank provided in a ship and a system for measuring the draft of the ship.

The level of the fluid stored in the fluid storage tank of the present ship or offshore plant is measured by installing a sounding pipe and then inserting a tape or rod.

The draft, draft, and trim of a ship or an offshore plant are visually recognized using a small ship. For accurate measurement, the ship or an offshore plant is approached and measured using a manual gauge.

Conventionally, there are ultrasonic level gauges, pressure gauges, and capacitance gauges for measuring the fluid level, but ultrasonic gauges and pressure gauges can not be installed when the fluid is not in the tank, There is a disadvantage in that the response speed is slow, the weight is heavy, and the cost is high. Therefore, researches have been made on a method using an optical fiber in which electrical stability and device reliability are ensured.

Figure 1 is a graph of a water level sensor using a conventional optical fiber directional coupler with a light distribution ratio (Son, Kyung-Rak et al., Journal of Korean Society of Marine Engineers, Korean Society of Marine Engineers, 2010.09., Vol. 846 to 851).

In the conventional level measurement method of FIG. 1, light is split by an optical fiber type splitter with respect to one incident light, and the intensity of light, which is changed by the interference of the reflected light of the divided light, This is a method for dropping contact.

That is, in the conventional system, the intensity of incident light of the two paths S1 and S2 is changed according to the intensity ratio of incident light (m%, n%). Since the level of the reflected light varies depending on the distribution ratio, According to the results of the research, it is necessary to determine different distribution ratios according to the fluid reservoir to be applied. In addition, it is necessary to experimentally obtain a measurement with a certain precision by dividing one light source into several by the optical fiber type coupler. Since the detection values are different depending on the number, it is necessary to clarify the criterion according to the case.

In addition, it is necessary to individually determine how much the measurement level of the optical fiber sensor should be diversified, and it is practically possible to measure the measurement criterion based on the number of the light components.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide an apparatus and method for measuring a measurement object, which can be applied irrespective of a position to be measured, The present invention provides a level measuring system for a fluid storage tank and a draft measurement system for a vessel which can be applied to measurement of a level of a fluid storage tank and a draft of the vessel.

A fluid level measurement system for a fluid storage tank according to the present invention includes a light source for emitting measurement light, an optical fiber cluster for transmitting light from the light source to a measurement point through an optical fiber, a photodetector for detecting reflected light from the optical fiber cluster, And a signal processing device for processing the light detected by the photodetector.

Here, the light source emits n incident light, the optical fiber cluster includes n optical fiber sensors, and the photodetector detects n reflected light.

The optical fiber cluster may include n optical fiber sensors and n optical couplers.

The n optical fiber sensors are different in length from each other.

Furthermore, the optical fiber cluster may further include a light guide portion having n or more holes through which the n optical fiber sensors pass, and a cover member surrounding the light guide portion.

Here, a magnetic material is attached to one side of the covering material.

Further, the light guide portion may further include a curved surface guide portion, and the curved surface guide portion may have a greater thickness than the other light guide portions.

A ship draft measurement system according to the present invention comprises a light source for emitting measurement light, an optical fiber cluster for transmitting light from the light source to a measurement point through an optical fiber, a photodetector for detecting reflected light from the optical fiber cluster, And a signal processing device for processing light detected by the photodetector, wherein the measurement point is an outer surface of the ship, wherein the optical fiber cluster measures the height at which the ship is immersed in water.

Here, the light source emits n incident light, and the photodetector detects n reflected light, and the optical fiber cluster includes n optical fiber sensors and n optical couplers.

The lengths of the n optical fiber sensors are different from each other.

Furthermore, the outer surface of the ship on which the optical fiber clusters are installed includes at least three measuring points on the forward side, the aft side, and the center.

According to the fluid level measurement system of the present invention, since the level of the fluid level is measured by using the optical fiber sensor, there is no risk of short circuit, the size of the system can be reduced, Suitable for storage tanks.

Further, it is possible to set the accuracy in the measurement box to a sufficient value as required.

In addition, even if the measurement object is applied differently, the system can be applied in a compatible and practical manner without causing a change in the system.

On the other hand, according to the ship draft measurement system of the present invention, the signal can be directly applied to the hull so as to be monitored by the control system, so that it can be practically applied to the ship.

1 shows a method for measuring the level of a water level by a conventional optical fiber sensor.
Fig. 2 is a view for explaining the level measuring system of the fluid storage tank of the present invention.
3 schematically shows a level measuring system for a fluid storage tank of the present invention.
Figures 4 and 5 are partial views of a portion of a fluid level measurement system for a fluid storage tank of the present invention.
6 conceptually illustrates a further configuration of a fluid level measurement system for a fluid storage tank of the present invention.
7 schematically shows a ship draft measurement system of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic view of a fluid level measurement system for a fluid storage tank of the present invention. FIG. 3 is a schematic view of a fluid level measurement system for a fluid storage tank of the present invention. FIGS. 6 is a conceptual illustration of a further configuration of a fluid level measurement system for a fluid storage tank of the present invention.

2 and 3, the level measuring system of the fluid storage tank according to the embodiment of the present invention measures the level of the fluid storage tank using the optical fiber sensor, It is suitable for fluid storage tanks where the size can be reduced and high pressure and explosion risk exist.

Further, it is possible to set the accuracy in the measurement box to a sufficient value as required, and it is a system that can be applied compatibly and practically without changing the system even if the measurement object is applied differently.

Such a fluid storage tank level measurement system includes a light source 10, an optical fiber cluster 20, a photodetector 30, and a signal processing device.

The light source 10 is a power source for emitting measurement light.

The optical fiber cluster 20 is for transmitting light from a light source through an optical fiber to transmit light to a measurement point.

The present invention is for detecting the light reflected after the light propagates from the optical fiber cluster 20 to the measurement point by the photodetector 30 and measuring the intensity of the light.

To this end, the light detected by the photodetector 30 is transmitted to a signal processing device (not shown), and the signal processing device may include a photoelectric conversion element, a signal recognition board, a signal processor, and the like.

The optical fiber clusters 20 of the present invention include an optical fiber sensor 21 and a optically coupleable coupler 22. The present invention allows n incident light from a light source to transmit light through n optical fiber sensors 21 and n reflected light beams from the n optical fiber sensors 21 are transmitted to the photodetector 30.

To this end, the optical fiber cluster 20 has n number of optically coupleable couplers 22 for n optical fiber sensors.

In the case of a fiber optic sensor, optically coupled coupler, incident light,

As shown in the figure, the lengths of the five optical fiber sensors 21 are set differently.

By setting the lengths of the respective optical fiber sensors 21 differently, the water level can be measured by the difference of the reflected light.

That is, when the medium being changed at the end of the optical fiber sensor 21 is air, the intensity of reflected light is large, and when the medium is a fluid, the reflected light is weaker than that.

Therefore, if the intensity is strongly detected from the optical fiber sensor 21 having the shortest length from the longest optical fiber sensor by the optical fiber sensor 21 having a different length, will be.

In cities, this is limited to five, but this can be increased for measurement accuracy.

Since the incident light and the measurement light and the reflected light through the optical fiber sensor correspond to each other at a ratio of 1: 1: 1, even if the number of the optical fiber sensors is increased in a physically permissible range with different lengths, It is obvious that it is in contact with the fluid medium. Therefore, it is not possible to actually apply it by setting a value derived by a separate experiment using the distribution ratio.

Therefore, it is possible to apply the desired measurement accuracy as much as possible according to the object to be measured, and even if the object to be measured changes, the entire system can be applied without change as it is.

In addition, since a plurality of optical fiber sensors form one unit, this is referred to as an optical fiber cluster in the present invention.

Further, the optical fiber cluster 20 includes a light guide portion 23 including n or more holes 24 through which n optical fiber sensors 21 pass, and a cover member 25 surrounding the light guide portion is provided .

By attaching the magnetic material 26 to one side of the covering material, it is possible to attach the magnetic material 26 by attaching to the inner wall of the fluid storage tank or the like.

This is applicable because the optical fiber is not affected by the surrounding magnetic field.

Further, the fluid storage tank to which the present invention is applied has a high pressure characteristic and a risk of explosion, but the water level measurement system using the optical fiber of the present invention has a feature that it can be constructed even in such an environment.

Next, Fig. 7 schematically shows a ship draft measurement system of the present invention.

7, the ship draft measurement system according to an embodiment of the present invention can be applied to the ship substantially by monitoring it by a control system by measuring the signal directly applied to the hull. have.

The ship draft measurement system of the present invention applied to Fig. 7 is applied to the same configuration and principle as the level measurement system of the fluid storage tank described above.

However, in the ship draft measurement system of the present invention, the target to be measured is the draft of the ship, the outer wall of the ship is the measurement position, and the optical fiber cluster is extended to the measurement point of the outer wall of the ship.

Therefore, it is judged whether the point is in contact with water through the optical fiber cluster installed at one point of the outer wall of the hull, and the draft is judged.

Furthermore, the ship draft measurement system of the present invention is capable of calculating the trim of a ship by measuring draft at multiple points.

For this purpose, it is possible to measure the trim of the ship at least when the installation position includes a set of aft, aft, and center.

As described above, the level measurement system of the fluid storage tank according to the present invention measures the level of the fluid storage tank using the optical fiber sensor, so there is no danger of short circuit, the size of the system can be reduced, Suitable for existing fluid storage tanks. Further, it is possible to set the accuracy in the measurement box to a sufficient value as required. In addition, even if the measurement object is applied differently, the system can be applied in a compatible and practical manner without causing a change in the system.

On the other hand, the ship draft measurement system of the present invention is a system that can be applied to a ship substantially by monitoring it by a control system by measuring a signal directly applied to a ship.

As described above, the system for measuring the level of the fluid storage tank according to the present invention and the system for measuring the draft of the ship have been described with reference to the drawings. However, the present invention is not limited to the above- It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

10: Light source
20: Fiber Optic Clusters
21: Optical fiber sensor
22: optically coupled coupler
23: light guide portion 24: hole
25: Cover material
26: Magnetic body
30: photodetector

Claims (8)

A light source for emitting measurement light;
An optical fiber cluster for transmitting light from the light source through an optical fiber to a measurement point;
A photodetector for detecting reflected light from the optical fiber cluster; And
And a signal processing device for processing light detected by the photodetector.
Level measurement system for fluid storage tanks. The method according to claim 1,
The light source emits n incident light,
Wherein the optical fiber cluster includes n optical fiber sensors,
Characterized in that the photodetector detects n reflected light beams.
Level measurement system for fluid storage tanks. The method of claim 2,
The optical fiber cluster includes:
n optical fiber sensors; And
RTI ID = 0.0 > n < / RTI >
Level measurement system for fluid storage tanks. The method of claim 3,
Wherein the lengths of the n optical fiber sensors are different from each other,
Level measurement system for fluid storage tanks. The method of claim 4,
The optical fiber cluster includes:
A light guide part having n or more holes through which the n optical fiber sensors pass; And
And a cover member surrounding the light guide portion.
Level measurement system for fluid storage tanks. The method of claim 5,
Characterized in that a magnetic material is attached to one side of the covering material.
Level measurement system for fluid storage tanks. The method of claim 5,
Wherein the light guide portion further comprises a curved guide portion,
Wherein the curved guide portion has a greater thickness than the other light guide portions.
Level measurement system for fluid storage tanks. A method of measuring a draft of a ship using a level measuring system according to any one of claims 1 to 7,
Ship drafting system.
KR1020150175078A 2015-12-09 2015-12-09 Fluid level detecting system of cargo tank and draft detecting system of the vessel KR20170068181A (en)

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Application Number Priority Date Filing Date Title
KR1020150175078A KR20170068181A (en) 2015-12-09 2015-12-09 Fluid level detecting system of cargo tank and draft detecting system of the vessel

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Application Number Priority Date Filing Date Title
KR1020150175078A KR20170068181A (en) 2015-12-09 2015-12-09 Fluid level detecting system of cargo tank and draft detecting system of the vessel

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237445B1 (en) 2019-11-18 2021-04-07 (주)대창솔루션 Measurement System of Pressure Difference in Tank
CN116772969A (en) * 2023-08-24 2023-09-19 华能澜沧江水电股份有限公司 Ship draft measuring device and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237445B1 (en) 2019-11-18 2021-04-07 (주)대창솔루션 Measurement System of Pressure Difference in Tank
KR20210060374A (en) 2019-11-18 2021-05-26 (주)대창솔루션 Measurement System of Pressure Difference in Tank Preventing Liquid Inflow
CN116772969A (en) * 2023-08-24 2023-09-19 华能澜沧江水电股份有限公司 Ship draft measuring device and method
CN116772969B (en) * 2023-08-24 2023-11-28 华能澜沧江水电股份有限公司 Ship draft measuring device and method

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