CN116046206A - Environment temperature self-adaptive distributed optical fiber fire monitoring method and system - Google Patents
Environment temperature self-adaptive distributed optical fiber fire monitoring method and system Download PDFInfo
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- CN116046206A CN116046206A CN202211619294.7A CN202211619294A CN116046206A CN 116046206 A CN116046206 A CN 116046206A CN 202211619294 A CN202211619294 A CN 202211619294A CN 116046206 A CN116046206 A CN 116046206A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
Abstract
The invention provides an environment temperature self-adaptive distributed optical fiber fire monitoring method, which comprises the following steps: step S1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters; step S2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data; step S3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value; step S4: and outputting alarm information of the alarm point relative to the ambient temperature. The invention has the function of acquiring the ambient temperature in real time and applies the ambient temperature to an alarm process, so that the invention is suitable for being applied to any part of ships with different ambient temperatures and unstable ambient temperatures; the invention can give the position and alarm information of all high temperature abnormal points, avoid missing report and improve the alarm accuracy of the distributed optical fiber temperature measurement system.
Description
Technical Field
The invention relates to the technical field of optical fiber temperature measurement, in particular to an environment temperature self-adaptive distributed optical fiber fire monitoring method and system.
Background
The working current of high-voltage cables, power distribution cabinets, cable bridge frames and the like in the ship cabin is large, the heat quantity is high, the interior of a cable channel is not suitable for radiating, abnormal conditions such as local overheating are generated, and effective prevention is difficult to achieve by means of manual monitoring or inspection. If the fire is not found timely, fire hidden danger is easily caused; potential defects and ageing of the cable bundle are not easy to find by crews, and along with the increase of the running time, overheating is possibly caused by overlarge current carrying capacity or overload and the like, particularly the joint of the cable is more easy to generate heat, and combustibles are ignited, so that the cable bundle is extremely threatening.
At present, smoke-sensing and temperature-sensing fire detectors are widely used in ship fire monitoring systems, and fire conditions can be effectively found through smoke and temperature detection after fire. However, because some special spaces (such as high-voltage cables, cable bridges, channels and the like) are not suitable for adopting the traditional fire detection means, the data transmission based on the electric signals is easily affected by surrounding electromagnetic fields, and compared with the traditional fire detector, the optical fiber temperature sensor has the advantages of resisting strong electromagnetic interference, preventing moisture and radiation, being intrinsically safe and the like.
The real-time on-line monitoring of the temperature becomes a primary factor for avoiding fire accidents such as the inside of an electric cabinet, a cable bridge frame, the inside of an electric appliance and the like, and if early warning is carried out through temperature measurement at the early stage of the accident and measures are taken rapidly, the fire accidents can be effectively avoided.
The distributed optical fiber temperature measurement system only needs one sensing optical fiber, and simultaneously utilizes the optical fiber as a sensing element and a transmission element, so that real-time monitoring of temperature information distributed along an optical fiber collection path can be realized, no measurement blind area exists, wiring is simple, and the distributed optical fiber temperature measurement system is particularly suitable for application occasions requiring long-distance and large-range measurement for many years. The detection host is positioned in a control room, the detection optical cable is paved in a channel, one end of the detection optical cable is connected with an optical fiber sensor of the detection host, the detection host is also connected with fire alarm monitoring equipment in a related area, the equipment can be overheated and early-warned in advance, faults can be timely discharged before a fire disaster occurs, an early warning signal can be triggered through a constant temperature alarm mode and a differential constant temperature alarm mode once the fire disaster occurs, the early warning signal is transmitted to a fire alarm monitoring system, fire fighting linkage is realized with other fire fighting systems, the occurrence of the fire disaster is treated at the highest speed, the accident is eliminated in the germination, the most timely support is provided for rescue, and the damage is limited in a controllable range.
The traditional distributed optical fiber temperature measurement fire monitoring system adopts a single threshold detection method (comprising a constant temperature threshold and a differential temperature threshold), and in one fireproof partition, fire judgment is carried out on only one high temperature point, and once two or more high temperature points appear, missing reports are generated on other fire points, the temperature of certain parts of a ship is higher than that of a civil place, the temperature of certain parts of the ship is lower, the temperature of certain parts of the ship slowly rises or suddenly changes along with time, and the traditional distributed optical fiber temperature measurement fire monitoring system cannot meet the use of special environments of the ship by adopting the single threshold detection method.
Most of patents in the field of distributed optical fiber temperature measurement systems are focused on patents of the distributed optical fiber temperature measurement systems, optical fiber sensor hardware, optical fiber modules and cable circuits which are affected due to the change of the ambient temperature, so that the patents of the invention for carrying out temperature compensation on the optical fiber modules and the cable circuits are not patents of an ambient temperature self-adaptive fire monitoring method.
Patent document CN104535221B discloses a distributed optical fiber temperature measurement intelligent analysis method, which performs partition management on a cable for temperature measurement and installs optical fiber temperature measurement equipment; setting alarm parameters in a background data processing system, wherein the alarm parameters comprise a highest temperature, a lowest temperature, an environmental temperature difference, an average temperature difference, a temperature difference value and the like, and generating a slow temperature change alarm and a temperature jump alarm when the alarm parameters exceed a set value;
patent document CN114184302a discloses a distributed optical fiber temperature measuring device, a photovoltaic panel temperature measuring system and a method, comprising a temperature measuring module and a temperature measuring optical fiber, wherein the temperature measuring optical fiber comprises a sensing optical fiber and an isolating optical fiber which are arranged at intervals in a crossing way, the measuring sensitivity of the temperature measuring point can be adjusted by adjusting the length of the sensing optical fiber, and the accuracy of temperature measurement is ensured.
However, none of the above patents sufficiently considers the temperature state of the optical fiber using environment, and cannot adapt to the change of the environment temperature in real time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an environment temperature self-adaptive distributed optical fiber fire monitoring method and system.
The invention provides an environment temperature self-adaptive distributed optical fiber fire monitoring method, which comprises the following steps:
step S1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters;
step S2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data;
step S3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value;
step S4: and outputting alarm information of the alarm point relative to the ambient temperature.
Preferably, in said step S1:
4 channels are arranged in the distributed optical fiber temperature measurement system, 2km optical fibers are installed in the longest of each channel to serve as sensing equipment, and optical fiber sensing equipment with corresponding length is laid according to the size of a monitored area and monitoring requirements.
Preferably, in said step S2:
the upper computer is connected with the optical fiber temperature measuring system, communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the functions of: storing real-time temperature measurement data of the optical fiber, setting a monitoring range, setting an alarm mode and an alarm threshold value of each channel and storing a path of the monitoring data;
the host computer sets up alarm parameter, includes: monitoring range, positioning accuracy, sampling interval, sampling data storage path and the like and relative temperature threshold, wherein the monitoring range is the length of an optical fiber laid in a monitored area;
starting a starting button, recording optical fiber temperature measurement data in real time, starting heating equipment to generate a high-temperature hot spot, and generating a high-temperature abnormal spot in the optical fiber measured temperature data.
Preferably, in said step S3:
removing high-temperature abnormal points from all temperature data measured by an optical fiber temperature measuring system, and obtaining an average value of the rest data, wherein the average value is used as the ambient temperature;
the high-temperature abnormal points in the temperature data are positioned at the right end of the normal distribution curve, the temperature data distributed at the two ends are removed by utilizing the normal distribution function, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system are removed;
calculating the average value of all temperature data, recording as u, calculating the standard deviation as d, removing abnormal values from a database, calculating the average value of the rest data, recording the average value as the current environmental temperature, and recording as T0; wherein the outliers are values greater than u+3d and less than u-3 d;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
Preferably, in said step S4:
and outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
The invention provides an environment temperature self-adaptive distributed optical fiber fire monitoring system, which comprises:
module M1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters;
module M2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data;
module M3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value;
module M4: and outputting alarm information of the alarm point relative to the ambient temperature.
Preferably, in said module M1:
4 channels are arranged in the distributed optical fiber temperature measurement system, 2km optical fibers are installed in the longest of each channel to serve as sensing equipment, and optical fiber sensing equipment with corresponding length is laid according to the size of a monitored area and monitoring requirements.
Preferably, in said module M2:
the upper computer is connected with the optical fiber temperature measuring system, communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the functions of: storing real-time temperature measurement data of the optical fiber, setting a monitoring range, setting an alarm mode and an alarm threshold value of each channel and storing a path of the monitoring data;
the host computer sets up alarm parameter, includes: monitoring range, positioning accuracy, sampling interval, sampling data storage path and the like and relative temperature threshold, wherein the monitoring range is the length of an optical fiber laid in a monitored area;
starting a starting button, recording optical fiber temperature measurement data in real time, starting heating equipment to generate a high-temperature hot spot, and generating a high-temperature abnormal spot in the optical fiber measured temperature data.
Preferably, in said module M3:
removing high-temperature abnormal points from all temperature data measured by an optical fiber temperature measuring system, and obtaining an average value of the rest data, wherein the average value is used as the ambient temperature;
the high-temperature abnormal points in the temperature data are positioned at the right end of the normal distribution curve, the temperature data distributed at the two ends are removed by utilizing the normal distribution function, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system are removed;
calculating the average value of all temperature data, recording as u, calculating the standard deviation as d, removing abnormal values from a database, calculating the average value of the rest data, recording the average value as the current environmental temperature, and recording as T0; wherein the outliers are values greater than u+3d and less than u-3 d;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
Preferably, in said module M4:
and outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
Compared with the prior art, the invention has the following beneficial effects:
1. the temperature of some special cabins such as a ship power cabin can change along with time, and the temperature of some cabins is higher than the environment of a general civil building, so that the method is completely not applicable to the alarm algorithm of the current optical fiber temperature measurement system, has the function of acquiring the ambient temperature in real time, and is applied to the alarm process, so that the method is applicable to any part of a ship with different ambient temperatures and unstable ambient temperature;
2. the invention can give the position and alarm information of all high temperature abnormal points, avoid missing report and improve the alarm accuracy of the distributed optical fiber temperature measurement system.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a graph of all temperature data for a fiber optic measurement line;
FIG. 2 is a flow chart of a distributed optical fiber fire monitoring method with adaptive ambient temperature.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1:
according to the invention, as shown in fig. 1-2, the method for monitoring the distributed optical fiber fire disaster with self-adaptive environment temperature comprises the following steps:
step S1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters;
specifically, in the step S1:
4 channels are arranged in the distributed optical fiber temperature measurement system, 2km optical fibers are installed in the longest of each channel to serve as sensing equipment, and optical fiber sensing equipment with corresponding length is laid according to the size of a monitored area and monitoring requirements.
Step S2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data;
specifically, in the step S2:
the upper computer is connected with the optical fiber temperature measuring system, communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the functions of: storing real-time temperature measurement data of the optical fiber, setting a monitoring range, setting an alarm mode and an alarm threshold value of each channel and storing a path of the monitoring data;
the host computer sets up alarm parameter, includes: monitoring range, positioning accuracy, sampling interval, sampling data storage path and the like and relative temperature threshold, wherein the monitoring range is the length of an optical fiber laid in a monitored area;
starting a starting button, recording optical fiber temperature measurement data in real time, starting heating equipment to generate a high-temperature hot spot, and generating a high-temperature abnormal spot in the optical fiber measured temperature data.
Step S3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value;
specifically, in the step S3:
removing high-temperature abnormal points from all temperature data measured by an optical fiber temperature measuring system, and obtaining an average value of the rest data, wherein the average value is used as the ambient temperature;
the high-temperature abnormal points in the temperature data are positioned at the right end of the normal distribution curve, the temperature data distributed at the two ends are removed by utilizing the normal distribution function, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system are removed;
calculating the average value of all temperature data, recording as u, calculating the standard deviation as d, removing abnormal values from a database, calculating the average value of the rest data, recording the average value as the current environmental temperature, and recording as T0; wherein the outliers are values greater than u+3d and less than u-3 d;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
Step S4: and outputting alarm information of the alarm point relative to the ambient temperature.
Specifically, in the step S4:
and outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
Example 2:
example 2 is a preferable example of example 1 to more specifically explain the present invention.
Those skilled in the art can understand the environmental temperature adaptive distributed optical fiber fire monitoring method provided by the invention as a specific implementation mode of an environmental temperature adaptive distributed optical fiber fire monitoring system, that is, the environmental temperature adaptive distributed optical fiber fire monitoring system can be realized by executing the step flow of the environmental temperature adaptive distributed optical fiber fire monitoring method.
The invention provides an environment temperature self-adaptive distributed optical fiber fire monitoring system, which comprises:
module M1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters;
specifically, in the module M1:
4 channels are arranged in the distributed optical fiber temperature measurement system, 2km optical fibers are installed in the longest of each channel to serve as sensing equipment, and optical fiber sensing equipment with corresponding length is laid according to the size of a monitored area and monitoring requirements.
Module M2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data;
specifically, in the module M2:
the upper computer is connected with the optical fiber temperature measuring system, communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the functions of: storing real-time temperature measurement data of the optical fiber, setting a monitoring range, setting an alarm mode and an alarm threshold value of each channel and storing a path of the monitoring data;
the host computer sets up alarm parameter, includes: monitoring range, positioning accuracy, sampling interval, sampling data storage path and the like and relative temperature threshold, wherein the monitoring range is the length of an optical fiber laid in a monitored area;
starting a starting button, recording optical fiber temperature measurement data in real time, starting heating equipment to generate a high-temperature hot spot, and generating a high-temperature abnormal spot in the optical fiber measured temperature data.
Module M3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value;
specifically, in the module M3:
removing high-temperature abnormal points from all temperature data measured by an optical fiber temperature measuring system, and obtaining an average value of the rest data, wherein the average value is used as the ambient temperature;
the high-temperature abnormal points in the temperature data are positioned at the right end of the normal distribution curve, the temperature data distributed at the two ends are removed by utilizing the normal distribution function, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system are removed;
calculating the average value of all temperature data, recording as u, calculating the standard deviation as d, removing abnormal values from a database, calculating the average value of the rest data, recording the average value as the current environmental temperature, and recording as T0; wherein the outliers are values greater than u+3d and less than u-3 d;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
Module M4: and outputting alarm information of the alarm point relative to the ambient temperature.
Specifically, in the module M4:
and outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
Example 3:
example 3 is a preferable example of example 1 to more specifically explain the present invention.
The invention relates to an environment temperature self-adaptive distributed optical fiber multi-point fire detection method, which is used for judging whether abnormal high-temperature fire points exist or not based on linear temperature data measured in real time by a linear distributed optical fiber temperature measurement system.
The invention relates to a linear distributed optical fiber temperature measurement technology and a fire detection technology, in particular to a real-time fire monitoring method based on a linear distributed optical fiber temperature measurement system. The environment temperature self-adaptive distributed optical fiber fire monitoring method is provided for the application of a ship in a high-temperature fire detection project by only adopting a single threshold detection method (comprising a constant temperature threshold and a differential temperature threshold) and cannot adapt to certain high-temperature and low-temperature environments and environments with real-time temperature change.
In order to achieve the above object, the technical solution of the present invention may be divided into the following steps:
4 channels are arranged in the distributed optical fiber temperature measurement system, each channel can be provided with 2km optical fibers as sensing equipment at the longest, and optical fiber sensing equipment with corresponding length is laid according to the size of the monitored area and the monitoring requirement.
The upper computer is connected with the optical fiber temperature measuring system, stably communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the following functions: the method comprises the steps of storing real-time temperature measurement data of an optical fiber, setting a monitoring range, alarming modes of each channel, alarming threshold values and storing paths of the monitoring data.
The host computer sets up alarm parameter, includes: the monitoring range (the monitoring range is the length of an optical fiber laid in a monitored area), positioning accuracy, sampling intervals, sampling data storage paths and the like, and relative temperature thresholds.
Starting a start button, recording optical fiber temperature measurement data in real time, starting heating equipment, generating a high-temperature hot spot, removing the high-temperature abnormal spot from all the temperature data measured by the optical fiber temperature measurement system, and taking the average value of the rest data as the environmental temperature.
The frequency of the temperature data is higher in a medium area, the frequency of the abnormal high temperature point is lower, the data shows a peak in a distribution diagram, and the frequency of the temperature data distributed from the middle to the two ends is gradually reduced, as shown in fig. 1, so that a similar normal distribution curve is formed. The curve accords with the normal distribution in statistics, the high-temperature abnormal points are positioned at the right end of the normal distribution curve, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system can be removed by utilizing the normal distribution function to remove the temperature data distributed at the two ends.
The mean of all temperature data was calculated and noted as u and the standard deviation as d. Removing abnormal values (i.e. values greater than u+3d and less than u-3 d) from the database, averaging the rest data, recording the average value as the current ambient temperature, and recording as T0;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
And outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
Example 4:
example 4 is a preferable example of example 1 to more specifically explain the present invention.
In the specific embodiment, 100 meters of optical fiber with the positioning precision of 0.1 meter is laid in an analog monitoring area to serve as optical fiber sensing equipment, the optical fiber is connected with an optical fiber temperature measuring system, the optical fiber sensing equipment is heated (the temperature measuring precision is required to be exceeded), the temperature measuring alarm condition of the system is observed, and the specific embodiment of the invention is described.
1. The electric blanket is used for tiling and simulating a wide cable bridge, sensing optical fibers are coiled into the shape required by optical fiber temperature measurement, (the temperature sensing optical fibers are laid above the electric blanket in a sine wave mode), corresponding monitoring channels are selected, the starting point and the end point of a monitoring range are set to be 0-100 meters, a sampling interval is set to be 0.1 meter, and a relative environmental temperature threshold is set to be 40 ℃. And starting an electric blanket to heat, and simulating short circuit and heating of a certain section of bridge cable.
2. And editing upper computer software by adopting a Tlater architecture of Python, starting an optical fiber temperature measuring system and an upper computer to perform temperature acquisition, connecting the software with the optical fiber temperature measuring system in a network manner, establishing a TCP server, stably communicating with the optical fiber temperature measuring system according to a network communication protocol, and analyzing the read data of the optical fiber temperature measuring system into real-time temperature data.
3. Calculating the ambient temperature based on real-time temperature data of 100 meters of optical fibers: and calculating the temperature average value of all points except the abnormal point of the 100 m optical fiber, and taking the temperature as the environment temperature. The mean value of all the read temperature data values Tn is calculated and recorded as u, and the standard deviation is calculated as d. Removing abnormal values (namely values larger than u+3d and smaller than u-3 d) in the data, averaging the rest data, and marking the average value as T0 and the current ambient temperature;
4. when the difference of the measured temperature value Tn minus T0 at a certain point on the optical fiber section is larger than or equal to the relative ambient temperature threshold value, triggering the relative ambient temperature alarm, otherwise, returning to the real-time temperature data analysis step.
5. And outputting alarm information of the alarm point positions relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point positions.
6. The alarm point position of the relative environmental temperature in the monitoring area is usually caused by accidents such as abnormal high temperature, combustion, explosion, fire disaster and the like, and through real-time relative environmental temperature alarm, all accident hidden dangers in the monitoring area can be effectively discovered, and effective measures can be timely taken to avoid further diffusion of hidden dangers and accidents.
Those skilled in the art will appreciate that the systems, apparatus, and their respective modules provided herein may be implemented entirely by logic programming of method steps such that the systems, apparatus, and their respective modules are implemented as logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc., in addition to the systems, apparatus, and their respective modules being implemented as pure computer readable program code. Therefore, the system, the apparatus, and the respective modules thereof provided by the present invention may be regarded as one hardware component, and the modules included therein for implementing various programs may also be regarded as structures within the hardware component; modules for implementing various functions may also be regarded as being either software programs for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. An environmental temperature adaptive distributed optical fiber fire monitoring method is characterized by comprising the following steps:
step S1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters;
step S2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data;
step S3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value;
step S4: and outputting alarm information of the alarm point relative to the ambient temperature.
2. The method for monitoring an ambient temperature-adaptive distributed optical fiber fire according to claim 1, wherein in said step S1:
4 channels are arranged in the distributed optical fiber temperature measurement system, 2km optical fibers are installed in the longest of each channel to serve as sensing equipment, and optical fiber sensing equipment with corresponding length is laid according to the size of a monitored area and monitoring requirements.
3. The method according to claim 1, wherein in the step S2:
the upper computer is connected with the optical fiber temperature measuring system, communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the functions of: storing real-time temperature measurement data of the optical fiber, setting a monitoring range, setting an alarm mode and an alarm threshold value of each channel and storing a path of the monitoring data;
the host computer sets up alarm parameter, includes: monitoring range, positioning accuracy, sampling interval, sampling data storage path and the like and relative temperature threshold, wherein the monitoring range is the length of an optical fiber laid in a monitored area;
starting a starting button, recording optical fiber temperature measurement data in real time, starting heating equipment to generate a high-temperature hot spot, and generating a high-temperature abnormal spot in the optical fiber measured temperature data.
4. The method according to claim 1, wherein in the step S3:
removing high-temperature abnormal points from all temperature data measured by an optical fiber temperature measuring system, and obtaining an average value of the rest data, wherein the average value is used as the ambient temperature;
the high-temperature abnormal points in the temperature data are positioned at the right end of the normal distribution curve, the temperature data distributed at the two ends are removed by utilizing the normal distribution function, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system are removed;
calculating the average value of all temperature data, recording as u, calculating the standard deviation as d, removing abnormal values from a database, calculating the average value of the rest data, recording the average value as the current environmental temperature, and recording as T0; wherein the outliers are values greater than u+3d and less than u-3 d;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
5. The method for monitoring an ambient temperature-adaptive distributed optical fiber fire according to claim 1, wherein in said step S4:
and outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
6. An ambient temperature adaptive distributed fiber optic fire monitoring system, comprising:
module M1: setting a channel, installing optical fibers as sensing equipment, and setting alarm parameters;
module M2: the upper computer is connected with the optical fiber sensing equipment and analyzes the read optical fiber temperature measurement system data into real-time temperature data;
module M3: calculating the average value of the real-time temperature data, and triggering an alarm when the average value is greater than or equal to a preset value;
module M4: and outputting alarm information of the alarm point relative to the ambient temperature.
7. The ambient temperature-adaptive distributed fiber optic fire monitoring system of claim 6, wherein in the module M1:
4 channels are arranged in the distributed optical fiber temperature measurement system, 2km optical fibers are installed in the longest of each channel to serve as sensing equipment, and optical fiber sensing equipment with corresponding length is laid according to the size of a monitored area and monitoring requirements.
8. The ambient temperature-adaptive distributed fiber optic fire monitoring system of claim 6, wherein in the module M2:
the upper computer is connected with the optical fiber temperature measuring system, communicates with the optical fiber temperature measuring system according to a network communication protocol, and analyzes the read data of the optical fiber temperature measuring system into real-time temperature data, and the upper computer software has the functions of: storing real-time temperature measurement data of the optical fiber, setting a monitoring range, setting an alarm mode and an alarm threshold value of each channel and storing a path of the monitoring data;
the host computer sets up alarm parameter, includes: monitoring range, positioning accuracy, sampling interval, sampling data storage path and the like and relative temperature threshold, wherein the monitoring range is the length of an optical fiber laid in a monitored area;
starting a starting button, recording optical fiber temperature measurement data in real time, starting heating equipment to generate a high-temperature hot spot, and generating a high-temperature abnormal spot in the optical fiber measured temperature data.
9. The ambient temperature-adaptive distributed fiber optic fire monitoring system of claim 6, wherein in the module M3:
removing high-temperature abnormal points from all temperature data measured by an optical fiber temperature measuring system, and obtaining an average value of the rest data, wherein the average value is used as the ambient temperature;
the high-temperature abnormal points in the temperature data are positioned at the right end of the normal distribution curve, the temperature data distributed at the two ends are removed by utilizing the normal distribution function, and the high-temperature abnormal points in all the temperature data measured by the optical fiber temperature measuring system are removed;
calculating the average value of all temperature data, recording as u, calculating the standard deviation as d, removing abnormal values from a database, calculating the average value of the rest data, recording the average value as the current environmental temperature, and recording as T0; wherein the outliers are values greater than u+3d and less than u-3 d;
in real-time monitoring, when the difference of the temperature Tn minus T0 at a certain point is larger than or equal to a relative temperature threshold value, a relative environment temperature alarm is triggered.
10. The ambient temperature-adaptive distributed fiber optic fire monitoring system of claim 6, wherein in the module M4:
and outputting alarm information of the alarm point relative to the ambient temperature, wherein the alarm information comprises position data, temperature data and fire alarm data of the alarm point.
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