阅读说明：本技术 一种预置光纤传感器的全缠绕式气瓶及其制造方法 (Fully-wound gas cylinder with preset optical fiber sensor and manufacturing method thereof ) 是由 陈东晖 白勇 白强 李均 付志勇 李俊 于 2021-03-30 设计创作，主要内容包括：本发明公开了一种预置光纤传感器的全缠绕式气瓶及其制造方法,包括内胆和瓶阀座,内胆上设置有瓶阀座,内胆及瓶阀座外连续缠绕有一层或多层浸渍纤维增强层,浸渍纤维增强层外连续缠绕有一层或多层用于温度检测的光纤传感器,一层或多层浸渍纤维增强层及光纤传感器整体固化成型,光纤传感器两端设置预留接头,预留接头末端连接有信号线接口,预留接头外罩有一层接头连接保护套,接头连接保护套与内胆和瓶阀座固定连接。本发明通过一根预置于气瓶缠绕层的光纤传感器,实现对整个气瓶表面的温度监测。同时设置有连通预留接头的信号线接口,一体注塑有接头连接保护套,方便连接信号发射和处理单元,同时保护好预留接头和信号线接口。(The invention discloses a full-winding gas cylinder with a preset optical fiber sensor and a manufacturing method thereof, wherein the full-winding gas cylinder comprises an inner container and a cylinder valve seat, the cylinder valve seat is arranged on the inner container, one or more layers of impregnated fiber reinforced layers are continuously wound outside the inner container and the cylinder valve seat, one or more layers of optical fiber sensors for temperature detection are continuously wound outside the impregnated fiber reinforced layers, the one or more layers of impregnated fiber reinforced layers and the optical fiber sensors are integrally cured and molded, reserved joints are arranged at two ends of the optical fiber sensors, the tail ends of the reserved joints are connected with signal wire interfaces, a joint connecting protective sleeve is covered outside the reserved joints, and the joint connecting protective sleeve is fixedly connected with the inner container and. The invention realizes the temperature monitoring of the whole gas cylinder surface through the optical fiber sensor preset on the gas cylinder winding layer. Meanwhile, a signal line interface communicated with the reserved connector is arranged, and a connector connecting protective sleeve is integrally molded, so that the signal transmitting and processing unit is conveniently connected, and the reserved connector and the signal line interface are well protected.)

1. The utility model provides a preset fiber sensor's full wound form gas cylinder, includes inner bag and bottle disk seat, is provided with the bottle disk seat on the inner bag, characterized by, the outer continuous winding of inner bag and bottle disk seat has one deck or multilayer impregnated fiber enhancement layer, the outer continuous winding of impregnated fiber enhancement layer has one deck or multilayer to be used for the fiber sensor of temperature detection, one deck or multilayer impregnated fiber enhancement layer and the whole solidification of fiber sensor, fiber sensor both ends set up the reservation and connect, reservation connects the end-to-end connection and has the signal line interface, the reservation connects the dustcoat to have one deck joint connection protective sheath, joint connection protective sheath and inner bag and bottle disk seat fixed connection, the signal line interface exposes outside the joint connection protective sheath for connect signal transmission and processing unit.

2. The fully-wound gas cylinder with the preset optical fiber sensor as claimed in claim 1, wherein each layer of the impregnated fiber reinforced layer comprises a spirally wound layer of impregnated fiber and a circumferentially wound layer of impregnated fiber, the spirally wound layer of impregnated fiber is formed by spirally winding the impregnated fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the circumferentially wound layer of impregnated fiber is formed by circumferentially winding the impregnated fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat.

3. The fully-wound gas cylinder with the preset optical fiber sensor as claimed in claim 1, wherein each layer of the optical fiber sensor comprises a spiral winding layer of the optical fiber sensor and a circumferential winding layer of the optical fiber sensor, the spiral winding layer of the optical fiber sensor is formed by spirally winding the optical fiber sensor on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the circumferential winding layer of the optical fiber sensor is formed by annularly winding the optical fiber sensor on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat.

4. The fully-wound gas cylinder with the preset optical fiber sensor as claimed in claim 1, wherein the inner container is a plastic inner container, and the cylinder valve seat is a metal cylinder valve seat.

5. The fully-wound gas cylinder with the preset optical fiber sensor as claimed in claim 1, wherein the two ends of the inner container are fixedly connected with a cylinder valve seat respectively.

6. The fully wound gas cylinder with the preset optical fiber sensor as claimed in claim 1, wherein the optical fiber sensor is coated with a coating sensitive to a storage medium of the gas cylinder.

7. The fully-wound gas cylinder with the pre-arranged optical fiber sensor as claimed in claim 1, wherein one or more layers of impregnated glass fiber protective layers are continuously wound outside the optical fiber sensor, each layer of the impregnated glass fiber protective layer comprises an impregnated glass fiber spiral winding layer and an impregnated glass fiber circumferential winding layer, the impregnated glass fiber spiral winding layer is formed by spirally winding the impregnated glass fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the impregnated glass fiber circumferential winding layer is formed by annularly winding the impregnated glass fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat.

8. The fully wound gas cylinder with the preset optical fiber sensor as claimed in claim 1, wherein the one or more layers of the impregnated glass fiber protective layers are integrally formed by curing.

9. A manufacturing method of a fully-wound gas cylinder with a preset optical fiber sensor is characterized by comprising the following steps:

(1) spirally winding the impregnated reinforcing fiber on the outer surfaces of the inner container and the cylinder valve seat, and continuously winding the gas cylinder for the next circle after the gas cylinder rotates for one angle every time the impregnated reinforcing fiber is wound for one circle; after n1 circles, the dipping reinforced fiber is fully distributed on the whole inner container and the outer surface of the bottle valve seat to form a layer of dipping fiber spiral winding layer;

(2) winding the impregnated fiber reinforcement on the outer surfaces of the inner container and the bottle valve seat in an annular manner, winding n2 circles of the impregnated fiber reinforcement from one end to the other end to form an impregnated fiber annular winding layer, and forming an impregnated fiber reinforcement layer by the impregnated fiber spiral winding layer and the impregnated fiber annular winding layer;

(3) repeating the steps 1-2 to form m1 layers of impregnated fiber reinforced layers, wherein the values of n1, n2 and m1 are designed and given according to the size of the gas cylinder and the pressure value to be borne;

(4) winding the optical fiber sensor on the outer surface of the impregnated fiber reinforced layer in the same way according to the steps 1 to 3, wherein the winding parameters are given by design according to the size of the gas cylinder and the network density to be measured; the two ends of the optical fiber are provided with reserved joints, the length is designed and protected, and the reserved joints are connected with signal line interfaces for connecting signal transmitting and processing units;

(5) positioning the signal line interface and the reserved joint position by using an injection mold, and then performing injection molding to form a layer of joint connecting protective sleeve, wherein the joint connecting protective sleeve, the liner and the bottle valve seat are integrally injection molded, and the joint connecting protective sleeve, the signal line interface and the reserved joint are integrally injection molded;

(6) winding the impregnated glass fiber used as the protective layer on the outer surface of the optical fiber sensor according to the method of the steps 1 to 3, wherein the winding parameters are given by design according to the size of the gas cylinder;

(7) feeding the gas cylinder wound in the step 6 into an oven for integral curing and forming; and finishing the manufacture of the whole fully-wound gas cylinder with the preset optical fiber sensor.

Technical Field

The invention relates to the technical field of pressure gas cylinders, in particular to a fully-wound gas cylinder with a preset optical fiber sensor and a manufacturing method thereof.

Background

The pressure gas cylinder is used as an important storage container and widely applied to various industries such as energy, transportation, medical treatment, municipal administration, industry and the like. In view of the dangerousness of high pressure and the characteristics of toxicity, harmfulness, flammability, explosiveness and the like of storage media, the safety of the gas cylinder is always the first index for assessing the quality of the gas cylinder.

In the case of conventional gas cylinders, which are secured by type tests and annual inspections, in some high-safety applications (for example, vehicle-mounted gas cylinders), gas concentration sensors or leak-proof devices may be provided to detect the concentration of leaking gas and to dispose of the leaked gas, and these devices mostly require a gas-trapping cover (for example, CN 112393820A) or an additional sealing device (for example, CN108679437A, CN111174100A, CN111156420A, CN111156414, CN111174101B, CN111153061A, CN111156423B, CN111156424A, CN111174103B, CN 112216852A) to collect and guide the leaked gas to the gas concentration sensors or leak-proof devices, thereby causing waste of usage space.

The distributed optical fiber sensor has the characteristics of small volume, full distribution, low energy consumption, interference resistance, corrosion resistance, wide temperature resistance, intrinsically safe property and long-term stability, is very suitable for sensing and monitoring dangerous and severe environment occasions, and is currently applied to sensing and monitoring occasions such as pressure pipelines, oil and gas storage tanks, tunnels and the like.

The installation of the current distributed optical fiber sensor is usually carried out after the installation construction of a monitored object is completed, the installation mode mainly comprises bonding and suspension, and the possibility of weak bonding, poor sensing effect and accidental damage exists. And the reserved joints at the two ends of the existing distributed optical fiber sensor are scattered, so that the wiring is inconvenient in a construction site during use, and the exposed wire ends of the reserved joints are easy to pollute and damage.

Disclosure of Invention

In order to solve the technical problem, the invention designs a fully-wound gas cylinder with a preset optical fiber sensor and a manufacturing method thereof.

The invention adopts the following technical scheme:

the utility model provides a preset fiber sensor's full wound form gas cylinder, including inner bag and bottle disk seat, be provided with the bottle disk seat on the inner bag, the outer continuous winding of inner bag and bottle disk seat has one deck or multilayer flooding fiber reinforcement layer, the outer continuous winding of flooding fiber reinforcement layer has one deck or multilayer to be used for temperature detection's fiber sensor, one deck or multilayer flooding fiber reinforcement layer and the whole solidification of fiber sensor, fiber sensor both ends set up the reservation and connect, reservation connects the end-to-end connection and has the signal line interface, the reservation connects the dustcoat to have one deck to connect the protective sheath, connect the protective sheath and inner bag and bottle disk seat fixed connection, the signal line interface exposes outside the joint connection protective sheath, be used for connecting signal transmission and processing unit. After the impregnated reinforcing fiber and the optical fiber sensor are wound, the whole gas cylinder is cured in an oven, so that the liner, the reinforcing fiber and the optical fiber sensor are cured into a whole, and the protection of the optical fiber from being damaged and the temperature conduction are facilitated.

Preferably, each layer of the impregnated fiber reinforced layer comprises a spirally wound layer of impregnated fiber and a circumferentially wound layer of impregnated fiber, the spirally wound layer of impregnated fiber is formed by spirally winding the impregnated fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the circumferentially wound layer of impregnated fiber is formed by annularly winding the impregnated fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat. The impregnated fibers may preferably be carbon fibers.

Preferably, each layer of the optical fiber sensor comprises an optical fiber sensor spiral winding layer and an optical fiber sensor annular winding layer, the optical fiber sensor spiral winding layer is formed by winding the optical fiber sensor on the outer surfaces of the inner container and the bottle valve seat in a spiral direction and is fully distributed on the outer surfaces of the inner container and the bottle valve seat, and the optical fiber sensor annular winding layer is formed by winding the optical fiber sensor on the outer surfaces of the inner container and the bottle valve seat in an annular direction and is fully distributed on the outer surfaces of the inner container and the bottle valve seat.

Preferably, the liner is a plastic liner, and the bottle valve seat is a metal bottle valve seat.

Preferably, the two ends of the inner container are fixedly connected with bottle valve seats respectively.

Preferably, the optical fiber sensor is coated with a coating sensitive to a storage medium of the gas cylinder.

Preferably, one or more layers of impregnated glass fiber protective layers are continuously wound outside the optical fiber sensor, each layer of the impregnated glass fiber protective layers comprises an impregnated glass fiber spiral winding layer and an impregnated glass fiber circumferential winding layer, the impregnated glass fiber spiral winding layer is formed by spirally winding impregnated glass fibers on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the impregnated glass fiber circumferential winding layer is formed by annularly winding the impregnated glass fibers on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat. The spiral winding can meet the distribution of optical fiber sensors at the end part of the gas cylinder, and the annular winding can strengthen the distribution of the optical fiber sensors at the cylindrical part of the gas cylinder, namely most of gas cylinder leakage occurs at the cylindrical part of the gas cylinder. Winding a distributed optical fiber sensor for temperature detection on the surface of the gas cylinder by utilizing the process of winding the impregnated reinforcing fiber by a fully-wound gas cylinder; forming a continuous, distributed network of temperature sensors covering the entire outer surface of the cylinder; the density of the network can reach cm level, and when the number of winding layers is increased, the density of the network can reach mm level. The increase of the number of winding layers is beneficial to improving the density of the optical fiber sensor.

Preferably, the one or more protective layers of impregnated glass fibers are integrally cured. And a glass fiber protective layer is impregnated to protect the internal optical fiber sensor from being damaged. The impregnated glass fiber layer for protection is solidified with the impregnated reinforcing fiber and the optical fiber sensor in the impregnated glass fiber layer into a whole.

The manufacturing method of the fully-wound gas cylinder with the preset optical fiber sensor comprises the following steps:

1. spirally winding the impregnated reinforcing fiber on the outer surfaces of the inner container and the cylinder valve seat, wherein the gas cylinder rotates by an angle to continue to be wound by the next circle when the impregnated reinforcing fiber is wound by one circle; after n1 circles, the dipping reinforced fiber is fully distributed on the whole inner container and the outer surface of the bottle valve seat to form a layer of dipping fiber spiral winding layer;

2. winding the impregnated fiber reinforcement on the outer surfaces of the inner container and the bottle valve seat in an annular manner, winding n2 circles of the impregnated fiber reinforcement from one end to the other end to form an impregnated fiber annular winding layer, and forming an impregnated fiber reinforcement layer by the impregnated fiber spiral winding layer and the impregnated fiber annular winding layer;

3. repeating the steps 1-2 to form m1 layers of impregnated fiber reinforced layers, wherein the values of n1, n2 and m1 are designed and given according to the size of the gas cylinder and the pressure value to be borne;

4. winding the optical fiber sensor on the outer surface of the impregnated fiber reinforced layer in the same way according to the steps 1 to 3, wherein the winding parameters are given by design according to the size of the gas cylinder and the network density to be measured; the two ends of the optical fiber are provided with reserved joints, the length is designed and protected, and the reserved joints are connected with signal line interfaces for connecting signal transmitting and processing units;

5. positioning the signal line interface and the reserved joint position by using an injection mold, and then performing injection molding to form a layer of joint connecting protective sleeve, wherein the joint connecting protective sleeve, the liner and the bottle valve seat are integrally injection molded, and the joint connecting protective sleeve, the signal line interface and the reserved joint are integrally injection molded;

6. winding the impregnated glass fiber used as a protective layer on the outer surface of the optical fiber sensor according to the method of the steps 1 to 3, wherein the winding parameters are given by design according to the size of the gas cylinder;

7. feeding the gas cylinder wound in the step 6 into an oven for integral curing and forming; and finishing the manufacture of the whole fully-wound gas cylinder with the preset optical fiber sensor.

When the fully-wound gas cylinder with the preset optical fiber sensor is used, the signal line connectors connected with the two ends of the reserved optical fiber sensor are inserted into signal transmitting and processing unit connecting lines, and the signal transmitting and processing units are scattered and interfered by optical signals to change along with the external environment, so that distributed temperature measurement on the surface of the gas cylinder is realized, the leakage at any position of the surface of the gas cylinder can be caused by the change of the temperature of surrounding materials due to the change of pressure, and the gas cylinder is sensed by the optical fiber sensor nearby. The signal processing unit issues a leak warning by finding a local area temperature anomaly.

The invention has the beneficial effects that: (1) the optical fiber sensor is arranged in the gas cylinder winding layer in advance, so that the temperature of the surface of the whole gas cylinder is monitored, a gas collecting cover or an additional sealing device for collecting leaked gas is omitted, the structure is simplified, and the space is saved. When a plurality of gas cylinders are used together, the optical fiber sensors can be connected in series, so that the purpose that a set of external signal transmitting and processing unit monitors the plurality of gas cylinders is achieved; (2) the signal line interface that is provided with intercommunication reservation joint, the integrative joint connection protective sheath of having moulded plastics simultaneously conveniently connects signal transmission and processing unit, protects reservation joint and signal line interface well simultaneously.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a structure of the optical fiber sensor of the present invention when spirally wound;

FIG. 3 is a schematic diagram of a configuration of the optical fiber sensor of the present invention when it is hoop wound;

in the figure: 1. the inner container, 2, bottle valve seat, 3, optical fiber sensor, 4, reserve joint, 5, joint connection protective sheath, 6, signal line interface.

Detailed Description

The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:

example (b): as shown in the attached figures 1-3, the fully-wound gas cylinder with the preset optical fiber sensor comprises a liner 1 and a cylinder valve seat 2, wherein the cylinder valve seat is arranged on the liner, one or more layers of impregnated fiber reinforced layers are continuously wound outside the liner and the cylinder valve seat, one or more layers of optical fiber sensors 3 for temperature detection are continuously wound outside the impregnated fiber reinforced layers, the one or more layers of impregnated fiber reinforced layers and the optical fiber sensors are integrally cured and molded, reserved joints 4 are arranged at two ends of the optical fiber sensors, the tail ends of the reserved joints are connected with signal line interfaces 6, a layer of joint connecting protective sleeve 5 covers the reserved joints, the joint connecting protective sleeve is fixedly connected with the liner and the cylinder valve seat, and the signal line interfaces are exposed outside the joint connecting protective sleeve and used for connecting a signal transmitting and. After the impregnated reinforcing fiber and the optical fiber sensor are wound, the whole gas cylinder is cured in an oven, so that the liner, the reinforcing fiber and the optical fiber sensor are cured into a whole, and the protection of the optical fiber from being damaged and the temperature conduction are facilitated.

Preferably, each layer of the impregnated fiber reinforced layer comprises a spirally wound layer of impregnated fiber and a circumferentially wound layer of impregnated fiber, the spirally wound layer of impregnated fiber is formed by spirally winding the impregnated fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the circumferentially wound layer of impregnated fiber is formed by annularly winding the impregnated fiber on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat. The impregnated fibers may preferably be carbon fibers.

Preferably, each layer of the optical fiber sensor comprises an optical fiber sensor spiral winding layer and an optical fiber sensor annular winding layer, the optical fiber sensor spiral winding layer is formed by winding the optical fiber sensor on the outer surfaces of the inner container and the bottle valve seat in a spiral direction and is fully distributed on the outer surfaces of the inner container and the bottle valve seat, and the optical fiber sensor annular winding layer is formed by winding the optical fiber sensor on the outer surfaces of the inner container and the bottle valve seat in an annular direction and is fully distributed on the outer surfaces of the inner container and the bottle valve seat.

Preferably, the liner is a plastic liner, and the bottle valve seat is a metal bottle valve seat.

Preferably, the two ends of the inner container are fixedly connected with bottle valve seats respectively.

Preferably, the optical fiber sensor is coated with a coating sensitive to a storage medium of the gas cylinder.

Preferably, one or more layers of impregnated glass fiber protective layers are continuously wound outside the optical fiber sensor, each layer of the impregnated glass fiber protective layers comprises an impregnated glass fiber spiral winding layer and an impregnated glass fiber circumferential winding layer, the impregnated glass fiber spiral winding layer is formed by spirally winding impregnated glass fibers on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat, and the impregnated glass fiber circumferential winding layer is formed by annularly winding the impregnated glass fibers on the outer surfaces of the liner and the cylinder valve seat and is fully distributed on the outer surfaces of the liner and the cylinder valve seat. The spiral winding can meet the distribution of optical fiber sensors at the end part of the gas cylinder, and the annular winding can strengthen the distribution of the optical fiber sensors at the cylindrical part of the gas cylinder, namely most of gas cylinder leakage occurs at the cylindrical part of the gas cylinder. Winding a distributed optical fiber sensor for temperature detection on the surface of the gas cylinder by utilizing the process of winding the impregnated reinforcing fiber by a fully-wound gas cylinder; forming a continuous, distributed network of temperature sensors covering the entire outer surface of the cylinder; the density of the network can reach cm level, and when the number of winding layers is increased, the density of the network can reach mm level. The increase of the number of winding layers is beneficial to improving the density of the optical fiber sensor.

Preferably, the one or more protective layers of impregnated glass fibers are integrally cured. And a glass fiber protective layer is impregnated to protect the internal optical fiber sensor from being damaged. The impregnated glass fiber layer for protection is solidified with the impregnated reinforcing fiber and the optical fiber sensor in the impregnated glass fiber layer into a whole.

The manufacturing method of the fully-wound gas cylinder with the preset optical fiber sensor comprises the following steps:

1. spirally winding the impregnated reinforcing fiber on the outer surfaces of the inner container and the cylinder valve seat, wherein the gas cylinder rotates by an angle to continue to be wound by the next circle when the impregnated reinforcing fiber is wound by one circle; after n1 circles, the dipping reinforced fiber is fully distributed on the whole inner container and the outer surface of the bottle valve seat to form a layer of dipping fiber spiral winding layer;

2. winding the impregnated fiber reinforcement on the outer surfaces of the inner container and the bottle valve seat in an annular manner, winding n2 circles of the impregnated fiber reinforcement from one end to the other end to form an impregnated fiber annular winding layer, and forming an impregnated fiber reinforcement layer by the impregnated fiber spiral winding layer and the impregnated fiber annular winding layer;

3. repeating the steps 1-2 to form m1 layers of impregnated fiber reinforced layers, wherein the values of n1, n2 and m1 are designed and given according to the size of the gas cylinder and the pressure value to be borne;

4. winding the optical fiber sensor on the outer surface of the impregnated fiber reinforced layer in the same way according to the steps 1 to 3, wherein the winding parameters are given by design according to the size of the gas cylinder and the network density to be measured; the two ends of the optical fiber are provided with reserved joints, the length is designed and protected, and the reserved joints are connected with signal line interfaces for connecting signal transmitting and processing units;

5. positioning the signal line interface and the reserved joint position by using an injection mold, and then performing injection molding to form a layer of joint connecting protective sleeve, wherein the joint connecting protective sleeve, the liner and the bottle valve seat are integrally injection molded, and the joint connecting protective sleeve, the signal line interface and the reserved joint are integrally injection molded;

6. winding the impregnated glass fiber used as a protective layer on the outer surface of the optical fiber sensor according to the method of the steps 1 to 3, wherein the winding parameters are given by design according to the size of the gas cylinder;

7. feeding the gas cylinder wound in the step 6 into an oven for integral curing and forming; and finishing the manufacture of the whole fully-wound gas cylinder with the preset optical fiber sensor.

When the fully-wound gas cylinder with the preset optical fiber sensor is used, the signal line connectors connected with the two ends of the reserved optical fiber sensor are inserted into signal transmitting and processing unit connecting lines, and the signal transmitting and processing units are scattered and interfered by optical signals to change along with the external environment, so that distributed temperature measurement on the surface of the gas cylinder is realized, the leakage at any position of the surface of the gas cylinder can be caused by the change of the temperature of surrounding materials due to the change of pressure, and the gas cylinder is sensed by the optical fiber sensor nearby. The signal processing unit issues a leak warning by finding a local area temperature anomaly.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.