The third generation distributed optical fiber temperature measuring system (DTS) independently developed by our company combines the advantages of the first two generations, and makes small adjustments on the basis of the first two generations, making the temperature measuring host more portable and easier to operate.

The distributed optical fiber temperature measurement system (DTS) can display the measured temperature information of the temperature sensing fiber on the display screen of the optical fiber temperature measurement host in the form of graphics. The warning information and alarm information can be output in the form of sound, light and graphic interface alarm, and the fire alarm information and fault information are obviously different.

Distributed optical fiber temperature measurement system (DTS) can be divided according to user requirements of the display partition, similar to the optical fiber temperature measurement system, each control partition can set different response sensitivity and constant temperature alarm value, the system has a constant temperature and temperature rise alarm function. The optical fiber test instrument has a self-test function, which can alarm the fault of the temperature measuring host and the fault of the temperature sensing optical fiber, provide 24-hour real-time monitoring for the entire optical fiber, provide real-time temperature within the monitoring range, online temperature rise and other graphic information, provide a complete historical file record, and can query the working status of the system at any time. System data is transmitted in the following priority order: fire alarm data (higher level) → Forecast alarm (fault) data → normal data.

The distributed optical fiber temperature measurement system (DTS) can upload the temperature information required by the integrated monitoring system to the integrated monitoring system through the communication interface according to the protocol format specified by the owner for display and storage. At present, the distributed optical fiber temperature measurement system (DTS) software has included the following optional functional modules: graphical analysis software module, short message alarm module, remote communication module and so on. Software modules can be organized at any time, and some modules can be developed according to user needs.

Characteristics of optical fiber temperature measurement system

(1) Speediness:

System temperature measurement, positioning speed is very high. In order to improve the measurement time, Ningbo Oriental Light Safety Technology Co., Ltd. adopts high-speed data filtering technology to solve the problem of mass digital filtering optimization;

The laser transmitter in the main engine of the system emits tens of thousands of light pulses per second, and outputs the average sampling temperature to the display system, basically eliminating errors.

(2) Distribution characteristics:

The linear optical fiber temperature sensing fire monitoring system is a distributed optical fiber temperature measurement system, which can provide continuous dynamic monitoring of the temperature change signal at every 0.5 meters within a range of 10 kilometers, and can set temperature alarm values at any level.

(3) Accuracy:

The sampling interval of the system is 0.5m, the temperature resolution is 0.1℃, and the temperature accuracy is ±1℃. The positioning accuracy is ±1m.

(4) Flexibility:

The linear fiber temperature sensing fire monitoring system is an on-line monitoring method.

The host of the system can provide relay interface (passive dry contact) to alarm on the fire alarm controller, and can provide a set of dry contact alarm signals according to the interval;

The monitoring system provides a continuous dynamic monitoring signal, the system can set multi-stage temperature alarm, that is, the system supports multi-stage alarm, such as 40℃ forecast alarm,50℃ take measures, etc., and can set the temperature parameters of alarm points according to different environments.

In order to avoid false alarms, according to the characteristics of large temperature change rate before the accident, the temperature rise rate can be set in the alarm setting for monitoring. When the temperature rise rate is detected to be greater than this value, an alarm signal will be sent and the corresponding signal output will be provided.

A variety of alarm conditions, as long as one is met, the system will immediately generate an alarm. The sampling interval can be adjusted according to the requirements of the site, the shortest sampling interval is 0.5 meters;

The alarm control area is programmable and can be flexibly designed according to the user's requirements, and each system can be set up no less than 300 different alarm control areas per kilometer for environmental changes. According to the special needs of the subway, the system can set every 50 meters as a zone. When there is an abnormal situation in a zone, the DTS system will automatically package the alarm information of the zone (such as location, alarm type, temperature value, etc.) and upload it to the subway centralized monitoring system.

(5) Compatibility:

The host of the linear optical fiber temperature sensing fire monitoring system is an open communication protocol, and provides a communication interface connecting with the workstation. The disaster prevention alarm workstation in the central control room displays all the information such as temperature curve, alarm position and alarm temperature in Chinese graphic way.

The system can be connected with PC, fire alarm system and other control equipment through the output form of RS232, RS485, built-in relay, RJ45 or other industrial protocols, for sound and light alarm, signal output is accurate and complete;

The linear optical fiber temperature sensing fire monitoring system can distinguish the output signals according to different alarm segments and levels to meet the needs of different control panels.

(6) Security:

System software authorization management, safe and reliable;

Users can update the system for future upgrades and maintenance;

The linear fiber-optic temperature sensing fire warning system has the safety record function, which can store all the historical data since the operation of the system, and can use the portable computer to download the relevant data;

If the optical fiber is damaged, the system can locate the damaged point, have self-diagnosis function, and weld it through the optical fiber welding machine, which is very important for the effective implementation of online monitoring;

The laser safety level meets Class 1 (no harm to human body when laser is exposed);

The detection fiber is safe and reliable, using optical signals, and will not produce mutual electromagnetic interference between the power cable.

Optical fiber temperature measurement system has many natural advantages compared with traditional sensors, mainly including:

(1) Continuous distributed measurement

The distributed optical fiber sensor is a truly distributed measurement, which can continuously obtain the measurement information along the detection cable tens of kilometers, and the false positive and false negative rate are greatly reduced. Real-time monitoring is also realized.

(2) Anti-electromagnetic interference, can work normally in a high electromagnetic environment.

The fiber itself is composed of quartz material, completely electrically insulated; At the same time, the signal of the optical fiber sensor is based on the optical fiber as the carrier, which is inherently safe and is not interfered by any external electromagnetic environment.

(3) Intrinsic lightning protection.

Lightning often destroys a large number of electrical sensors. Optical fiber sensors can resist the impact of high voltage and high current due to their complete electrical insulation.

(4) The measurement distance is far, suitable for remote monitoring.

The two outstanding advantages of optical fiber are the large amount of data transmission and small loss, and the remote monitoring of tens of kilometers can be achieved without relaying.

(5) High sensitivity, high measurement accuracy.

In theory, the sensitivity and measurement accuracy of most optical fiber sensors are better than that of general sensors, and the actual mature products have also proved this.

(6) Long life, low cost, simple system.

The material of optical fiber is generally quartz glass, which has non-corrosion, fire resistance, water resistance and long life characteristics, and can usually serve for 30 years. Considering the sensor's own cost and later maintenance costs, the use of optical fiber sensors can greatly reduce the final operating costs of the entire project.

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