KR101520840B1 - Temperature measurement system using optic fiber - Google Patents

Abstract

Another object of the present invention is to provide a structure for an optical cable and a heating cable in a supporting base structure. In order to achieve the above object, there is provided a temperature measurement system using an optical fiber in a support base structure supporting a storage tank, the temperature measurement system comprising: an optical cable for temperature measurement installed in the support base structure; a heating cable installed in the support base structure; A heating cable temperature control device for controlling the temperature of the support base structure; And an optical temperature sensor measuring device connected to the optical cable and measuring the temperature of the supporting base structure using the optical cable and controlling the heating cable temperature controlling device to maintain the temperature of all the positions of the supporting base structure at a constant level. The temperature measuring system using the optical cable is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature measurement system using an optical fiber,

The present invention relates to an apparatus and method for detecting a temperature change occurring in a power bus duct that is used when a temperature control management such as a gas storage place is required, To a temperature measurement monitoring system using an optical cable capable of monitoring at all times.

As energy consumption has increased recently, large-scale storage sites for oil and gas, which are energy sources, are needed. However, these energy sources are very sensitive to temperature changes in storage and storage. There is a risk of explosion if the temperature of the storage area rises. If the temperature of the storage area goes down too much, problems may occur.

In order to efficiently operate and secure high reliability of such a storage facility, there is a strong demand for constant monitoring of the facility and construction of an anomaly prevention management system. Especially, when the facility is long and is distributed in a large area, It is necessary to provide a highly reliable sensing system that collects the monitoring information of the electronic device without collecting the electromagnetic induction disturbance.

 In recent years, various sensor technologies have been developed and sensors using photonic technology have been developed. However, most of them are point sensors capable of measuring only the temperature of a local part. In order to detect a long section, A power supply, a transmission device, and the like are required, so it is practically impossible to sense the whole.

Korean Patent Application No. 2004-0032366 refers to a technique for detecting an abnormality or a fire of a cable installed in a building through measurement of reflected light of an optical cable, but a feature of managing the temperature change by measuring the temperature of the measurement object is mentioned It is not.

The object of the present invention is to maintain the temperature of the measurement object within the normal temperature range by managing the temperature change of the measurement object and comparing it with the normal temperature range.

It is still another object of the present invention to measure temperature changes of a measurement object more stably and accurately using a plurality of optical cables.

It is another object of the present invention to provide a structure for an optical cable and a heating cable in a supporting base structure.

It is another object of the present invention to provide various structures of optical cables and heating cables installed in a support base structure.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided a temperature measurement system using an optical fiber in a supporting base structure supporting a storage tank, the temperature measuring system comprising: an optical cable for temperature measurement installed in the supporting base structure and a heating cable installed in the supporting base structure; A heating cable temperature control device connected to the heating cable to control a temperature of the support base structure; And an optical temperature sensor measuring device connected to the optical cable and measuring the temperature of the supporting base structure using the optical cable and controlling the heating cable temperature controlling device to maintain the temperature of all the positions of the supporting base structure at a constant level. The temperature measuring system using the optical cable is provided.

The optical temperature sensor measuring apparatus includes a distance measuring unit for measuring a distance between a specific position of the optical cable and the optical cable connection unit, a temperature measuring unit for measuring a temperature of the specific position of the optical cable, And a controller for controlling the temperature of the supporting structure to be measured by using the distance and temperature measured by the measuring unit, And a control unit for controlling the heating cable temperature control unit to control the heating cable temperature control unit when the temperature of the corresponding position of the supporting base structure is out of the normal temperature range, A temperature controlling the temperature of the corresponding position of the substructure to be in the normal temperature range A control unit; And a display unit for displaying a temperature change for each of a plurality of sections of the supporting infrastructure.

Here, the measurement object temperature change operation unit may divide the area of the support base structure into a plurality of sections and calculate a temperature change for each section.

Here, the support base structure may have a space at regular intervals in the grooves or the inside thereof at regular intervals, and the optical cable and the heating cable may be mounted in the grooves.

Here, the optical cable and the heating cable may be disposed adjacent to each other in the support base structure.

Here, the optical cable and the heating cable may be included in one external cable.

The present invention has the effect of more accurately measuring the temperature of a wide area.

In addition, it is possible to provide various structures for installing the optical cable and the heating cable in the support base structure.

Further, there is an effect that the temperature of the measurement object can be maintained within the normal temperature range.

1 is a diagram showing a configuration of a temperature measurement system using an optical cable according to an embodiment of the present invention.
2 is a diagram illustrating a configuration for measuring a temperature of a measurement object using a temperature measurement system using an optical cable according to an embodiment of the present invention.
FIG. 3 is a view showing that an optical cable is connected to a light temperature sensor measuring device in a loop structure according to another embodiment of the present invention.
4 is a view illustrating a specific position of an optical cable using scattered light according to an embodiment of the present invention.
FIG. 5 is a diagram for explaining a method of measuring the temperature of a position where scattered light in an optical cable is reflected using Rayleigh scattered light and Raman scattered light spectrum according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating the position and temperature of a rear optical cable at a position where an anomaly occurs when an abnormality occurs in a specific position of the optical cable according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating the construction of separate loops using two optical cables according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating measurement of sections of measurement objects separately using a plurality of optical cables according to an embodiment of the present invention. FIG.
Fig. 9 is a view showing a case in which a plurality of optical cables are included in a case forming one loop according to an embodiment of the present invention. Fig.
10 is a diagram showing the temperature management for each zone of an object to be measured by using an optical cable according to an embodiment of the present invention.
11 is a diagram showing the construction of a temperature measuring system using an optical cable by adding a temperature control device according to an embodiment of the present invention.
12 is a diagram illustrating a plurality of measurement objects managed by a temperature measurement system using one optical cable using a single optical cable constituted by a loop according to an embodiment of the present invention.
13 is a diagram illustrating a method of managing a plurality of measurement objects by connecting only one side of an optical cable to a temperature measurement system using one optical cable according to an embodiment of the present invention.
FIG. 14 is a diagram showing a configuration of a temperature measurement system using an optical cable according to an embodiment of the present invention.
FIG. 15 is a diagram showing a temperature for each section of a measurement object in the display unit according to an embodiment of the present invention. FIG.
16 is a view showing a method of measuring a light temperature sensor according to an embodiment of the present invention.
17 is a view showing application of a temperature measurement system using an optical cable to a support base structure of an LNG gas tank according to an embodiment of the present invention.
18 and 19 are views showing the structure of a support base structure in which an optical cable and a heating cable are installed.
20 and 21 are views showing a positional relationship between an optical cable and a heating cable according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. First and second or the above terms are used only for the purpose of distinguishing one element from another. Also, the singular expressions may include plural expressions unless the context clearly dictates otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a configuration of a temperature measurement system using an optical cable according to an embodiment of the present invention.

1, an optical fiber temperature management system (OTMS) according to the present invention includes an optical temperature sensor measuring apparatus 100, an optical cable 200, a heating cable temperature control apparatus 400 ), And heating cables 401, 402, 403, 404, 405.

The optical temperature sensor measuring apparatus 100 measures the temperature of a specific distance of the optical cable 200 using the optical cable 200 and measures the position and the temperature of the measurement object 300 using the distance of the optical cable and the temperature of the optical cable. Can be measured.

The optical cable 200 is connected to the temperature sensor measurement device 100 and is installed in the measurement object 300. The optical cable 200 receives incident light from the temperature sensor measuring device 100 and reflects the scattered light.

The heating cable temperature control device 400 controls the heating cables 401, 402, 403, 404, and 405 provided in the measurement object 300 under the control of the optical temperature sensor measurement device 100, To be in the normal range.

The heating cables 401, 402, 403, 404, and 405 are provided in one or more of the measurement objects 300. Each of the heating cables 401, 402, 403, 404, 405 is installed at a predetermined interval in the measurement object 300 so that the heating cables 401, 402, 403, 404, It is responsible for the temperature of a certain area.

The optical cable 200 and the heating cables 401, 402, 403, 404, and 405 may be embedded in the support base structure 300 when the measurement object 300 is a support base structure.

In FIG. 1, the optical cable 200 and the heating cables 401, 402, 403, 404, and 405 are installed at different heights of the supporting base structure 300.

2 is a diagram illustrating a configuration for measuring a temperature of a measurement object using a temperature measurement system using an optical cable according to an embodiment of the present invention.

As shown in FIG. 2, the optical temperature sensor measuring apparatus 100 of the present invention measures the temperature of the supporting base structure 300 using the optical cable 200. That is, in the present invention, the optical cable 200 is used as a sensor for measuring the distance and the temperature.

The optical temperature sensor measuring apparatus 100 can measure the scattered light reflected in the optical cable 200 to determine the specific position of the optical cable 200 and measure the temperature at the corresponding position. The reason why the optical cable can be used as a sensor for measuring the distance and the temperature will be described later with reference to FIG. 4 and FIG.

The optical cable 200 is connected to the optical temperature sensor measuring apparatus 100 and is installed in contact with the measurement object 300. In FIG. 2, a single optical cable 200 is installed in the support base structure 300 at regular intervals in a zigzag form in order to measure the temperature of all the positions of the support base structure 300.

The optical cable 200 may be installed inside the support base structure 300 as shown in FIGS. 1 and 2, and the bent portion may be formed in the support base structure 300 to form a zigzag shape. It may be installed so as to protrude outward. That is, the portion bent from the one line to the next line of the optical cable 200 may be configured to extend out of the support base structure 300. The reason why the portion bent from one line to the next line of the optical cable 200 is installed so as to protrude outside the support base structure 300 is that if an abnormality occurs in a specific line of the support base structure 300, And the light is irradiated to the next line of the generated abnormal line, and the abnormality is detected through the scattered light of the abnormal line. It is possible to measure the temperature at the next stage of the formed portion or to allow the maintenance of the optical cable 200 to be convenient at the time of disconnection since the optical cable 200 is inserted into the support base structure 300. [

In the case where the optical cable 200 is connected to the optical temperature sensor measuring apparatus 100 as shown in FIG. 2 (that is, only one side of the optical cable 200 is connected to the optical temperature sensor measuring apparatus 100) The sensor measuring apparatus 100 can measure light scattered by the light reflected from the optical cable by irradiating light from the side connected to the optical cable 200 and measuring the temperature of the spot where the scattered light is reflected.

However, in the structure in which only one side of the optical cable 200 as shown in FIG. 2 is connected to the optical temperature sensor measuring apparatus 100, in the case where the specific part of the optical cable 200 is abnormal or disconnected, No light is transmitted. Therefore, it is impossible to measure the distance and the temperature using the optical cable at the rear portion of the optical cable portion where the abnormality occurs.

As shown in FIG. 1, heating cables 401, 402, 403, 404 and 405 are installed around the optical cable 200 so that the temperature of the measurement object is measured using the heating cables 401, 402, 403, 404, The temperature of the support base structure 300 may not be maintained at a constant temperature due to an external environmental factor or the like. That is, the temperature of a specific site may be lower than that of other sites. When the temperature of the measurement object is not constant, the position of the structure installed on the support base structure 300 may be changed.

For example, when the support base structure 300 is a support base structure of a large-scale LNG storage tank, if the temperature of the specific region is different from that of other regions, the surface of the region may swell up or off . If the surface can not maintain a constant height, the gas storage tank may be inclined, which may adversely affect the storage and storage of the gas. Also, if the temperature of the support base structure 300 is not constant, the temperature of all the parts of the gas storage tank can not be maintained constant, and therefore there is a risk of explosion.

Therefore, it is very important to keep the temperature of all parts constant if the support base structure 300 is the support base structure of the gas storage tank. In the present invention, the heating cables 401, 402, 403, 404, and 405 are used to transmit heat through a heating cable at a low temperature region to maintain the temperature of all portions of the support base structure 300 at a constant temperature So that the temperature is kept constant with the surrounding temperature. In the high temperature region, the heat transmitted from the heating cable is reduced, and the temperature is lowered to keep the temperature constant.

Although the heating cable is not shown in FIG. 2, the heating cable may be located between each line of the optical cable 200 as in FIG.

In addition, the temperature measuring system using the optical cable of the present invention may further include an RTD (Resistance Temperature Detector) sensor.

2, when the RTD sensor 500 is installed in the supporting base structure 300 in addition to the optical cable 200 to cause an error in the optical cable to cause a problem in temperature measurement, the RTD sensor 500 is used to support the supporting base The temperature of the structure 300 is measured.

Although FIG. 2 illustrates that the RTD sensor 500 is installed at the center of the support structure 300, more than one RTD sensor 500 may be installed at various locations in the support structure 300.

FIG. 3 is a view showing that an optical cable is connected to a light temperature sensor measuring device in a loop structure according to another embodiment of the present invention.

As shown in FIG. 3, the optical cable 200 is connected to the other side optical temperature sensor measuring device 100, not to the side of the optical cable 200, so that both sides of the optical cable 200 are connected to the optical temperature sensor measuring device 100 As shown in FIG.

3 shows that the optical fiber cable 200 is embedded in the support structure 300 when the support base structure 300 is a support base structure of a large-scale LNG gas tank.

 In the structure in which both ends of the optical cable 200 are connected to the optical temperature sensor measuring apparatus 100, the optical temperature sensor measuring apparatus 100 can irradiate light at both ends of the optical cable 200. Therefore, even when an abnormality occurs in a specific portion of the optical cable 200, the position and temperature of all the portions of the optical cable 200 in which the abnormality occurs can be measured by irradiating light from the other side.

A detailed description thereof will be given later with reference to FIG.

Although the heating cable is not shown in FIG. 3, the heating cable may be positioned between each line of the optical cable 200, as in FIG.

4 is a view illustrating a specific position of an optical cable using scattered light according to an embodiment of the present invention.

When light is incident on the optical cable 200, the incident light is absorbed by the quartz molecules in the optical cable to generate a transverse mode of thermal vibration, and then a part of the light is re- Stokes < / RTI > In addition, a part of the light is converted into a short-wavelength anti-Stokes light having a shorter wavelength than the incident light which absorbs the transverse mode and re-emits the energy.

At this time, a phenomenon such as scattering and absorption occurs due to the glass gratings (SiO 2) in the optical cable 200. Rayleigh scattered light having the same wavelength component as the incident light and scattered light having a different wavelength component exist in this scattered light. The components of other wavelengths have different names depending on the wavelength transition. Among them, the scattered light due to interaction with the transverse mode among the lattice thermal vibrations of the constituent materials is called Raman scattering light. This Raman scattering light exhibits a strong temperature dependence due to the Maxwell-Boltzmann energy distribution which exists between the various vibrational states of the quartz molecules. That is, the characteristic changes depending on the temperature.

Here, the position X at which the scattered light is generated inside the optical cable 200 can be simply calculated by measuring the time of the speed of light and the time the scattered light returns to correspond to the following formula (1).

Formula (1): X = v * t / 2

(v: transmission speed of light in the optical cable, t: time taken for scattered light to return)

That is, the position X at which the scattered light is generated can be measured by measuring the time at which light is incident and returned, dividing it by 2, and multiplying by the speed of light (2 x 10E8 m / sec).

FIG. 5 is a diagram for explaining a method of measuring the temperature of a position where scattered light in an optical cable is reflected using Rayleigh scattered light and Raman scattered light spectrum according to an embodiment of the present invention.

When abnormal deterioration occurs in a specific portion of the optical cable 200, Raman scattering light whose amplitudes vary with temperature varies in scattered light scattered at a specific point where abnormal deterioration occurs. The scattered light is reflected by the Raman scattering light The temperature of the point can be measured.

That is, since the Raman scattering light has a component of a wavelength different from the wavelength of the input light among the scattered light returning to the input end to which the light is irradiated, if the ratio of the wavelength of the incident light to the wavelength of the Raman scattering light reflected back is measured, The absolute temperature of the spot where the scattered light is reflected can be calculated.

The intensity ratio of the Stokes light and the anti-Stokes light is measured by the following formula (2)

Formula (2):

(h, k: Planck constant and Boltzmann constant,

    c: Light speed during vacuum

    T: Absolute temperature of core in optical fiber section receiving scattered light

v: frequency of incident light)

The temperature of the point where the scattered light of the optical cable 200 is reflected is obtained by the following formula (3).

Formula (3):

(tr: Reference point (reference fiber inside the distribution temperature sensor) Absolute temperature,

   r: reference position in reference optical fiber,

AS [j]: Additive value of anti-stokes light,

 S [j]: add value of stokes light,

K1, K2, K3: constant value)

Therefore, it is possible to measure the absolute temperature of the medium regardless of the light intensity, the incident condition, the structure of the optical cable, and the composition of the material by measuring the Stokes light and the anti-Stokes light in the optical cable 200, There is an optical fiber attenuation difference between Stokes and anti-Stokes wavelengths, and the propagation speed of light in the optical cable differs due to wavelength difference. Therefore, optical transmission characteristics, mechanical characteristics, and construction characteristics must be considered.

FIG. 6 is a diagram illustrating the position and temperature of a rear optical cable at a position where an anomaly occurs when an abnormality occurs in a specific position of the optical cable according to an embodiment of the present invention.

If the point at which an abnormality occurs in the optical cable 200 is X (hereinafter, X means a broken portion of the optical cable), the optical cable is connected to the optical temperature sensor measuring apparatus 100 with the structure shown in FIG. 2 The distance and temperature of the optical cable after the point X can not be measured. In other words, if the incident light travels from A to B direction, it is impossible to measure the position of the zone from X to B and the temperature measurement after the X point. This is because the incident light can not be transmitted.

3, when the optical fiber 200 is connected to the optical temperature sensor measuring apparatus 100 in a loop structure, the position and temperature of the zone from A to X irradiate the incident light to the A point The position and temperature of the zone from B to X can be measured using scattered light that reflects incident light and reflects back to B point.

Here, the position and temperature measured by the scattered light in the present invention are the point and the temperature in the optical cable 200. Accordingly, the temperature of the specific region and the corresponding region of the support base structure 300 is calculated by using the measured position and temperature in the optical cable.

Therefore, when the optical cable 200 is brought into contact with the support base structure 300 in a staggered manner, it is important to keep the intervals between neighboring optical cables at a constant interval.

In FIG. 6, the spacing between neighboring optical fibers 200 is kept constant, so that one line of optical cables can measure a certain distance L in the region of the supporting structure 300.

Although the heating cable is not shown in FIG. 6, the heating cable may be positioned between each line of the optical cable 200 as in FIG.

FIG. 7 is a diagram illustrating the construction of separate loops using two optical cables according to an embodiment of the present invention.

The present invention can also be configured as a plurality of loops 210 and 220 using a plurality of optical cables.

That is, one optical cable 210 can be used as a sensor for measuring a normal position and temperature, and another optical cable 220 can be used as a means for preparing a case where an optical cable 210 is operated.

7, when the position and the temperature of the X-point of the supporting base structure 300 are measured, when a failure occurs in the optical cable 210 performing the normal operation, the preliminary optical cable 220 is used The position and temperature of the X-point can be measured.

FIG. 8 is a diagram illustrating measurement of sections of measurement objects separately using a plurality of optical cables according to an embodiment of the present invention. FIG.

That is, the section of the supporting infrastructure 300 may be divided into a plurality of sections, and optical cables 210, 220, 230, 240, 250, 260, and 270 may be located in each section and the position and temperature of the section may be measured have.

In FIG. 7, the support base structure 300 may be divided into seven sections, and one optical cable may be positioned in each section to measure a desired position and a temperature at the corresponding section within the section.

Here, the heating cable is not shown, but may be located adjacent to the optical cables 210, 220, 230, 240, 250, 260, and 270.

Fig. 9 is a view showing a case in which a plurality of optical cables are included in a case forming one loop according to an embodiment of the present invention. Fig.

As shown in FIG. 7, when separate loops are formed using a plurality of optical cables to measure the position and temperature of the supporting base structure 300, a separate optical cable must be contacted or buried in the supporting base structure 300, There is a lot of time and process required.

Accordingly, in the present invention, it is possible to show the effect of using a plurality of loops as described in FIG. 7 by simply constructing a single loop on a measurement object by using the case 210 including a plurality of optical cables 201 and 202.

10 is a diagram showing the temperature management for each zone of an object to be measured by using an optical cable according to an embodiment of the present invention.

In the present invention, the support base structure 300 is divided into a plurality of zones A1, A2, B1, B2, C1, C2, C3, D1, D2, D3, E1, E2, F1 and F2, It can be managed separately.

That is, by calculating and managing the maximum temperature, the minimum temperature, and the average temperature in the measurement period for each of the zones A1, A2, B1, B2, C1, C2, C3, D1, D2, D3, E1, E2, F1, The temperature change of each zone can be known.

That is, although not shown in FIG. 10, a zone of the measurement object, the temperature of which is controlled through the heating gimbals during the control of the temperature control in the heating cable installed adjacent to the optical cable 200, A1, A2, B1, B2, C1, C2, C3, D1, D2, D3, E1, E2, F1 and F2.

By thus managing the temperature of the divided zone by dividing the measurement object into a plurality of zones A1, A2, B1, B2, C1, C2, C3, D1, D2, D3, E1, E2, F1, F2, Can identify the area where the problem occurs frequently and can establish countermeasures.

11 is a view showing a modified configuration of a heating cable in a temperature measurement system using an optical cable according to an embodiment of the present invention.

In FIG. 1, the heating cables 401, 402, 403, 404, and 405 and the optical cable 200 are installed at different heights of the measurement object. However, when the heating cables 401, 402, 403, 404, and 405 and the optical cable 200 are installed at different heights, a measurement error may occur due to the distance. That is, when the heating cables 401, 402, 403, 404 and 405 and the optical cable 200 are installed at different heights without being adjacent to each other, the temperature measured by the optical cable 200 may be different from the temperature controlled by the heating cables 401, 402, 403, 404 and 405 have.

11, one or more heating cables 401, 402, 403, 404, and 405 may be inserted between the lines of the optical cable 200 in a staggered manner between the lines of the optical cable 200, do. In this case, the distance between the optical cable 200 and the heating cables 401, 402, 403, 404, 405 can be kept to a minimum so that the temperature transmitted from the heating cables 401, 402, 403, 404, It is possible to measure more accurately.

12 is a diagram illustrating a plurality of measurement objects managed by a temperature measurement system using one optical cable using a single optical cable constituted by a loop according to an embodiment of the present invention.

The present invention can also be managed by connecting a plurality of measurement objects (301, 302, 303, 304) to one optical temperature sensor measurement apparatus (100).

That is, a loop is formed in one optical temperature sensor measuring apparatus 100, and one optical cable connected to each of the measurement objects 301, 302, 303, and 304 is continuously connected to measure the position and temperature of a desired position of the measurement object, Can be managed.

Here, although the heating cable is not shown, a heating cable may be installed adjacent to the optical cable installed in each of the measurement objects 301, 302, 303, and 304. [

13 is a diagram illustrating a method of managing a plurality of measurement objects by connecting only one side of an optical cable to a temperature measurement system using one optical cable according to an embodiment of the present invention.

The basic configuration is similar to that of FIG. 12, but one optical cable having only one side connected to the optical temperature sensor measuring device 100 is continuously connected to the measurement targets 301, 302, 303, and 304, Temperature can be measured and managed.

Here, although the heating cable is not shown, a heating cable may be installed adjacent to the optical cable installed in each of the measurement objects 301, 302, 303, and 304. [

14 is a diagram showing a configuration of an optical temperature sensor measuring apparatus according to an embodiment of the present invention.

The optical temperature sensor measuring apparatus 100 of the present invention includes an optical cable connecting unit 110, a distance measuring unit 120, a temperature measuring unit 130, a measured object temperature changing calculating unit 140, a display unit 150, ), And an alarm unit 170.

The optical cable connection unit 110 performs a function of irradiating incident light or measuring scattered light to a place connected to the optical cable.

The distance measuring unit 120 measures the distance of the point where the scattered light is reflected by using the scattered light received through the optical cable connection unit 110 as described above with reference to FIG.

The temperature measuring unit 130 measures the temperature at the point where the scattered light is reflected as described above with reference to FIG. 4 by using the scattered light received through the optical cable connection unit 110.

The measurement object temperature change calculation unit 140 calculates a temperature change at a corresponding position to be measured of the measurement object using the measured distance and temperature. The optical cable does not measure the temperature of all the areas of the object to be measured but measures the temperature at the place where the optical cable is located. It may cause a difference due to the error in the distance from the desired point of the object to be measured. Therefore, the measured object temperature change calculator 140 calculates the temperature of the desired point using the measured position and temperature from the optical cable. Or when a plurality of optical cables are used, the temperature at a desired point can be calculated using the temperature measured at each optical cable and the distance measured at the optical cable. For example, when two or more optical cables are configured as shown in FIG. 6, the distance and temperature measured in each optical cable can be averaged to calculate the position and temperature of the object to be measured.

The display unit 150 not only displays the position and temperature measured using the optical cable, but also divides the measurement object into a plurality of sections and displays a temperature change of each section.

The temperature controller 160 is connected to the heating cable temperature controller 400. If it is necessary to control the temperature of the specific area of the supporting base structure 300, the heating cable temperature control device 400 is controlled to control the temperature of the heating cable installed in the corresponding area, The temperature of the zone can be controlled to a desired temperature.

The alarm unit 170 generates an alarm when the temperature of the measurement object is out of the normal range, and notifies the system administrator of the alarm.

FIG. 15 is a diagram showing a temperature for each section of a measurement object in the display unit according to an embodiment of the present invention. FIG.

The display unit 150 divides the area of the support base structure 300 into a predetermined distance and displays a temperature change of the corresponding area according to the distant distance.

For example, in FIG. 15, the support base structure 300 is divided at intervals of 1 m and the temperature change of the corresponding zone is indicated. Here, the temperature change may be a maximum temperature, a minimum temperature, and an average temperature.

16 is a view showing a method of measuring a light temperature sensor according to an embodiment of the present invention.

Step S100 is a step of setting a normal temperature range of the measurement object (i.e., the support base structure 300).

The range of normal operation may be different depending on the measurement object 300. [ Accordingly, in the present invention, when an object to be measured is specified, a temperature range in which the object to be measured 300 operates normally is set.

Step S110 is a step of measuring the position and temperature of the point where the scattered light is reflected by the distance measuring unit 120 and the temperature measuring unit 130 using the scattered light.

In step S120, a position to be measured of the measurement object is determined using the distance and the temperature in the measured optical cable, and the temperature of the position is calculated.

Since the measured position and temperature are the distance and the temperature in the optical cable, the position of the object to be measured is calculated through the distance and temperature correction, and the temperature of the position is calculated.

In step S130, it is determined whether the temperature of the specific area of the measurement object calculated in step S120 is included in the normal temperature range.

In step S140, an abnormal alarm is generated when the temperature of the specific area of the measurement object calculated as a result of the determination in step S130 is out of the normal temperature range. Here, step S140 is not an essential constituent step of the present invention. That is, the process may proceed directly from step S130 to step S150 without an alarm.

In step S150, it is determined whether the temperature of the measurement object calculated as a result of the determination in step S130 is a normal temperature range or a problem due to the temperature change. If the temperature is outside the normal temperature range, if the difference is not significant, you can simply signal the alarm. If it deviates greatly from the normal temperature range, a problem due to the temperature change may occur. In this case, it is necessary to judge whether there is a possibility of a problem due to the temperature change.

In step S160, if it is determined that the temperature of the specific area of the measurement object calculated as a result of the determination in step S150 is far out of the normal range and a problem may arise, the temperature controller 160 controls the heating cable temperature controller 400 to measure Controlling the corresponding heating cable installed in a specific area of the object (i.e., the supporting base structure 300) so as to raise or lower the temperature of the corresponding zone so that the temperature is controlled to fall within the normal temperature range. 15, when the temperature of the specific area of the measurement object is lower than the normal range, heat is generated in the heating cable installed in the corresponding area so that the temperature of the corresponding area (position) is raised to be within the normal range .

17 is a view showing application of a temperature measurement system using an optical cable to a support base structure of an LNG gas tank according to an embodiment of the present invention.

As described above, according to the present invention, the temperature measurement system using the optical cable can maintain the temperature of the support base structure 300 of the large-scale LNG gas tank 600 at a constant level to prevent sudden temperature changes in the LNG gas tank 600 And to stabilize and store the LNG gas contained therein.

In the present invention, the heating cable temperature control device 400 is connected to an optical cable installed in the support base structure 300 controlled by the heating cable temperature control device 400 to measure and monitor the temperature change of the supporting base structure 300, The temperature of the supporting base structure 300 can be controlled by controlling the heating cable installed in the supporting base structure 300.

In the temperature measuring system using the optical cable of the present invention, the optical temperature sensor measuring apparatus 100 may be connected to one or more heating cable temperature control apparatuses 400 to monitor and control each heating cable temperature control apparatus 400.

18 and 19 are views showing the structure of a support base structure in which an optical cable and a heating cable are installed.

The support base structure 300 in the present invention is a structure for supporting a large-scale LNG storage gas tank as described above, and is formed of a concrete-like structure. Therefore, in order for the optical cable and the heating cable to be installed in the supporting base structure 300, a special structure must be formed in the supporting base structure 300.

18 shows grooves 310, 320, 330, 340 and 350 formed on the upper side of the support base structure 300. Grooves 310, 320, 330, 340 and 350 are formed at regular intervals on the upper side of the LNG storage tank, And an optical cable and a heating cable can be installed in the groove.

FIG. 19 is a view illustrating spaces 310, 320, 330, 340, and 350 formed inside the support base structure 300. The spaces 310, 320, 330, 340, and 350 are formed at regular intervals in the support base structure 300, An optical cable and a heating cable may be installed in the apparatus.

6, a single optical cable and a heating cable may be connected to a groove or an internal space formed in the support base structure 300, and may be installed in a neighboring groove or space, The optical cable and the heating cable may be installed in adjacent grooves or spaces as shown in the structure.

20 and 21 are views showing a positional relationship between an optical cable and a heating cable according to an embodiment of the present invention.

As described above, in the present invention, the optical cable 200 and the heating cable 401 may be installed adjacent to each other in a groove or an internal space of the supporting base structure 300.

The positional relationship between the optical cable 200 and the heating cable 401 is as follows.

FIG. 20 shows that the heating cable 401 is formed by winding the optical cable 200.

In an embodiment of the present invention, the heating cable 401 may be formed so as to surround the outer circumference of the optical cable 200.

In another embodiment of the present invention, the external cable 700 may be formed by covering the heating cable 401 and the optical cable 200. That is, the heating cable 401 and the optical cable 200 are installed in the inner space of the external cable 700, so that the positional relationship between the optical cable 200 and the heating cable 401 can be formed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

100: Optical temperature sensor measuring device 110: Optical cable connection part
120: distance measuring unit 130: temperature measuring unit
140: Measurement object temperature change arithmetic unit 150:
160: Temperature control unit 170: Alarm unit
200: Optical cable 300: support base structure
400: heating cable temperature control device 401,402,403,404,405: heating cable
500: RTD (Resistance Temperature Detector) sensor
600: LNG gas tank 700: External cable

Claims (6)

1. A temperature measurement system using an optical cable in a plurality of storage tanks and a plurality of support structures supporting the respective storage tanks,
An optical fiber for temperature measurement installed in each of the plurality of storage tanks and the plurality of support base structures;
A heating cable installed in each of the plurality of storage tanks and the plurality of support base structures;
A heating cable temperature control device connected to each of the heating cables to control a temperature of the plurality of storage tanks and the plurality of supporting substructures; And
And a controller for controlling the heating cable temperature controller to control the temperature of the plurality of storage tanks and the plurality of support base structures by using the optical cables connected to the respective optical cables, And a light temperature sensor measuring device for keeping the temperature of all the positions of the base structure constant,
The optical cables installed in the plurality of storage tanks
Wherein the plurality of storage tanks are connected to the plurality of storage tanks by forming a loop in the optical temperature sensor measuring device, wherein the plurality of storage tanks are divided into a plurality of areas having a constant interval,
An optical cable installed in the plurality of support base structures
The optical temperature sensor measuring apparatus includes a loop formed continuously and connected to a plurality of support base structures, wherein an area of an inner region of each of the plurality of support base structures is divided into a plurality of regions having a predetermined interval,
Each of the heating cables
Wherein the loop is formed so as to be adjacent to each of the optical cables forming the loop or to wind the respective optical cables.
The method according to claim 1,
The optical temperature sensor measuring device comprises:
Optical cable connection;
A distance measuring unit for measuring a distance of a specific position of the optical cable;
A temperature measuring unit for measuring a temperature of a specific position of the optical cable;
A measured object temperature change computing unit for computing a temperature change at a corresponding position to be measured by the support structure using the distance and temperature measured by the distance measuring unit and the temperature measuring unit, respectively;
An alarm unit for notifying the temperature of the measurement object temperature change calculation unit when the temperature is outside the normal temperature range;
Wherein the normal temperature range of the support base structure is set and the temperature of the corresponding position of the support base structure is controlled by controlling the heating cable temperature control device when the temperature of the corresponding position of the support base structure is out of the normal temperature range A temperature controller for controlling the temperature to be within the normal temperature range; And
And a display unit for displaying a temperature change for each of a plurality of sections of the support base structure.
3. The method of claim 2,
Wherein the measurement object temperature change arithmetic unit divides an area of the support base structure into a plurality of sections and calculates a temperature change of each section.
The method according to claim 1,
Wherein the supporting base structure has a space formed at regular intervals in the grooves or the inside thereof at regular intervals and the optical cable and the heating cable are mounted in the groove.
delete The method according to claim 1,
Wherein the optical cable and the heating cable are included in one external cable.

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