High voltage cable optical fiber temperature measurement system AY2000 AY2000高压电缆光纤测温系统
Product Name: temperature measurement host
Origin: Germany / China
Brand: America Agilent / Guangzhou country can control technology Co., Ltd
A detailed introduction:
Distributed optical fiber temperature sensing system (DTS) based on optical time domain reflection (OTDR) and optical fiber back to temperature effect, Raman scattering, detect the change of different position along the fiber temperature measurement, the realization of real distributed. In the system is the transmission media and optical fiber sensing media, optical fiber at each point of space modulation of the temperature field of the fiber in the back to the Raman scattering light intensity (anti tokes back to the Raman scattering light intensity), the wavelength division multiplexer and photoelectric detector to collect the spatial temperature information, and then by the signal processing, demodulation system for real-time temperature information will be extracted from the noise. The use of optical fiber in optical wave propagation velocity and the back light echo time interval, the positioning of the measured temperature point. Compared with the traditional sensor, the product has the following advantages: (1) measuring distance, which is suitable for remote monitoring. (2) the intrinsic lightning protection. (3) the anti electromagnetic interference, can work normally in high electromagnetic environment (4) continuous distributed measurement (6) high sensitivity, high measuring accuracy (7) and long service life, low cost, simple system.
Each field of the product has been successfully applied to a fire alarm monitoring, tunnel, cable temperature monitoring, dam leakage and temperature, heating pipe and oil pipe prison leakage monitoring etc..
Technical indicators:
The maximum measured distance: 30 km
Number of channels: 1, 2, 4, 6, 8, 16 optional (optical switch)
Connection: single terminal or double terminal
The sampling interval: 1 meters
Positioning accuracy: 1 meters
The measurement of time: <20 seconds
Temperature resolution: 0.1 C
Warning: 200 / each partition
Relay output: 64 Road (extensible)
Communication interface: 2 RS232 interface support MODBUS 1 Ethernet interface
The working principle of:
DTS distributed optical fiber temperature monitoring system and the use of fiber optic sensing signal and the signal transmission, the use of advanced OTDR technology and Raman scattering of light on the characteristics of temperature sensitive, detecting changes in different positions along the optical fiber temperature measurement, the realization of real distributed. Feather state DTS represents the highest level of the current international, both in the temperature resolution and spatial resolution, distance measurement, and the measuring time is higher than other company's products, users can view their use, select the appropriate model. The ZD series is a specially designed for highway tunnel, cable tunnel detection cable interlayer.
产品名称:测温主机
产地:德国 /中国
品牌:美国Agilent /广州国能控制技术有限公司
详细介绍:
分布式光纤温度传感系统（DTS）依据光纤的光时域反射（OTDR）和光纤背向Raman散射的温度效应,，探测出沿着光纤不同位置的温度的变化，实现真正分布式的测量。在系统中光纤既是传输媒体又是传感媒体，光纤所处空间各点的温度场调制了光纤中的背向Raman散射光的强度（反tokes背向Raman散射光的强度），经波分复用器和光电检测器采集了空间温度信息，再经信号处理，系统解调后将温度信息实时从噪声中提取出来。利用光纤中光波的传播速度和背向光回波的时间间隔，对所测温度点进行定位。与传统传感器相比该产品具有以下几点优势：（1）测量距离远，适于远程监控。（2）本征防雷。（3）抗电磁干扰，在高电磁环境中可以正常的工作（4）连续分布式测量（6）灵敏度高，测量精度高（7）寿命长，成本低，系统简单。
该产品已成功应用于火灾监测报警、隧道、电缆温度监控、大坝渗漏及温度监牢、供热管道及油气管渗漏监测等各个领域。
技术指标：
最大测量距离：30公里
通道数 : 1，2，4，6，8，16可选(光开关)
连接方式 : 单端或双端
取样间隔:1米
定位精度 :1 米
测量时间 :<20 秒
温度分辨率 :0.1℃
报警分区 :200 个/每路
继电器输出：64路(可扩展)
通讯接口：2 个 RS232 接口支持MODBUS，1个以太网接口
工作原理：
DTS分布式光纤温度监测系统同时利用光纤感测信号和传输信号，采用先进的OTDR技术和Raman散射光对温度敏感的特性，探测出沿着光纤不同位置的温度的变化，实现真正分布式的测量。羽邦的DTS代表着目前国际上的最高水平，无论在温度分辨率、空间分辨率、测量距离，还是测量时间上都高于其他公司的产品，用户可以针对自己的用途，选择相应的型号。其中ZD系列是一个专门设计用于公路隧道，电缆隧道，电缆夹层的探测。
图 1
Distributed optical fiber temperature sensor system is developed in recent years, a system for real-time measurement of temperature field. The system of optical fiber is the transmission media and media by using optical fiber sensing, back to the temperature effect of Raman scattering, the modulation space temperature field of the optical fiber is fiber Raman back scattering intensity (anti Stokes Raman back scattering light intensity), the wavelength division multiplexing and optical electric detector with temperature information acquisition the Raman back scattering light signal, the signal processing can demodulate the temperature information in real time. In the time domain, using the optical time-domain reflectometry (Optical Time Domain Reflection), according to the transmission rate and the back light in optical fiber, the echo time to the Raman scattering of light, can locate the temperature point.
The DTS system consists of a laser source, the sensor cable and detection unit, the schematic diagram of figure 1.
The basic principle is: laser pulse light emitted wavelength division multiplexer into the detection optical fiber, optical fiber inner molecular impurities and uneven of incident laser pulse scattering effect, the incident optical pulse transmission forward along the fiber, the scattered light to the surrounding transmission. Only along the fiber backward transmission scattering light to be transmitted to the wave division multiplexing device, then reaches the detector.
To a Rayleigh scattering, scattering light Brillouin scattering and Raman scattering, Raman scattering light contains two ingredients: Stokes light and Stokes light. Stokes optical frequency than the incident light frequency is low, the anti Stokes light frequency than the incident light frequency is high, Stokes light is only related with the fiber loss, stress, tension, bending, extrusion and other factors, influenced by temperature is small and negligible; anti Stokes light by optical fiber loss, in addition to the effects of stress and tension extrusion, bending, and other factors, also has the very big relations with temperature, optical fiber temperature is higher, the stronger anti Stokes light. The wavelength division multiplexer and band pass filter can separate the backward Stokes scattering light light and anti Stokes light, the optical signals are collected by the strength, anti Stokes intensity compared with the Stokes intensity, can get only the temperature related signal.
The two optical signal wavelength division multiplexer separated, respectively by the avalanche photodiode transforms the light signal into electrical signals, and then by the amplifier for signal amplification, is sent to the data acquisition card cumulative average, then get the precise value of light intensity quantization.
Between the anti Stokes intensity and Stokes intensity ratio and temperature of the quantitative relationship can be expressed as:
Type: H: the Planck coefficient (J, S); K: Pohl Seidman constant (J/K); Stokes light intensity;: Anti Stokes light intensity;: the incident light frequency (1/S);: Raman optical frequency increment (1/S). Stokes light frequency, anti Stokes light frequency.
Light in the fiber to spread a certain speed, by measuring the incident and backscattered light between the time difference, and the optical fiber light propagation speed, can calculate the different scattering point location away from the incident end distance, which can get the temperature distribution along the fiber almost continuously, can be calculated as follows:
Type:: the speed of light in the optical fiber (m/s); the backscatter time delay (s).
As long as measured by the detector, and the light in the fiber in the dissemination of time, we can get a point temperature.
分布式光纤温度传感器系统是近年来发展起来，用于实时测量空间温度场的系统。系统中光纤即是传输媒体又是传感媒体，利用光纤背向拉曼散射的温度效应，光纤所处的空间温度场调制了光纤是背向拉曼散射的强度（反斯托克斯背向拉曼散射光的强度），经波分复用器和光电检测器采集带有温度信息的背向拉曼散射光信号，经信号处理可以解调出实时的温度信息。在时域中，利用光时域反射技术（Optical Time Domain Reflection），根据光在光纤中的传输速率和背向拉曼散射光的回波时间，可以对温度点进行定位。
DTS系统由激光光源、传感光缆和检测单元组成，系统示意图见图表 1。
其基本原理是：激光器发出脉冲光通过波分复用器进入探测光纤，光纤内分子及不均匀的杂质对入射的激光脉冲有散射作用，入射光脉冲沿着光纤向前传输，散射光向四周传输。只有沿光纤后向传输的散射光会传输到波分复分器，再到达探测器。
后向散射光中有瑞利散射、布里渊散射和拉曼散射等，拉曼散射光包含有两种成份：斯托克斯光和反斯托克斯光。斯托克斯光的频率比入射光频率低，反斯托克斯光频率比入射光频率高，斯托克斯光只与光纤的损耗、应力、拉力、弯曲、挤压等因素有关，受温度影响很小，可以忽略不计；反斯托克斯光除受光纤的损耗、应力、拉力、弯曲、挤压等因素影响外，还与温度有很大关系，光纤的温度越高，反斯托克斯光越强。通过波分复用器和带通滤光片可以分离出后向散射光中斯托克斯光和反斯托克斯光，分别采集两路光信号的强度，用反斯托克斯光强与斯托克斯光强相比，就可以得到只有温度高低有关的信号。
经波分复用器分离出的两路光信号，分别由雪崩光电二极管将光信号转换为电信号，再经放大器对电信号放大，送到数据采集卡进行累加平均，便得到精确的光强度量化值。
反斯托克斯光强与斯托克斯光强之比和温度之间的定量关系可用下式表示：
式中：h：普朗克系数(J·S)；k：波尔兹曼常数(J/K)； ：斯托克斯光强度； ：反斯托克斯光强度； ：入射光的频率(1/S)； ：拉曼光频率增量(1/S)。斯托克斯光频率为 ，反斯托克斯光频率为 。
光在光纤中以一定的速度传播，通过测量入射光和后向散射光之间的时间差 ，及光纤内的光传播速度 ，可以计算不同散射点的位置距入射端的距离 ，从而可以得到光纤沿程几乎连续的温度分布， 可按下式计算：
式中： ：光纤中的光传播速度(m/s)； ：后向散射延迟时间(s)。
只要通过探测器测得 、 及光在光纤在传播时间 ，便可求得某一点的温度值。
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DTS system for monitoring Chinese software main interface
The functions of DTS system monitoring software:
1 real time data acquisition: from the monitored area point-to-point real-time collection of temperature value, the formation of real time database;
2 real-time data display: display the real time obtained from the current regional gathering temperature;
3 fixed temperature alarm: alarm and warning temperature set according to user requirements, and the monitored region segmentation settings for different partitions, each partition can be arbitrarily set the alarm value, monitoring of different standards for different parts of the;
4 temperature rise rate alarm: the monitored area reached according to user requirement set by the temperature rise rate of the predetermined value, can alarm alarm area, points out the position and data storage and print
5 historical data show: the user can through the historical data query temperature region at a given moment, a point of temperature, temperature, the highest in a certain time period;
The 6 characteristic curve shows include: at a given moment the temperature distribution curve, a time of a point of a time temperature change curve, the highest temperature change curve;
7 remote monitoring diagnosis and maintenance: through the Internet, can realize the on-site equipment remote monitoring, diagnosis and maintenance etc..
Real time monitoring of 8 detection system has good response characteristics.
9 real-time monitoring of temperature, display every 1 meters of each point of the real-time temperature changes. Continuous monitoring signals, any temperature point alarm.
10.DTS optical fiber detection system of internal PC, in the WINDOWS environment by the engineer to debug programming to complete. Set zone length and alarm points, system revision can be used Windows version 2000 software to complete.
11.DTS optical fiber detection system is a continuous monitoring signals, can be set up multi-level temperature alarm and multi-stage differential temperature alarm, or a combination of the two, the basic elimination of false alarms can be opposite at the same time alarm value is modified according to the requirements of.
12 based on environmental change is set up to 200 different alarm control area, control area programmable alarm, and can be designed according to user requirements, each individual alarm zone alarm can be set to different values.
13 if the detection optical fiber damage, DTS optical fiber detection system can instantly locate damaged points, and by re rapid recovery system, which is very important for online monitoring of the implementation of effective time;
The temperature signal of optical fiber detection system of 14.DTS and the alarm signal can be uploaded to the host computer and the fire control room.
DTS系统监测中文软件主界面
DTS系统监测软件功能：
1.实时数据采集: 从被监控区域逐点实时采集温度值,形成实时数据库；
2.实时数据显示：实时显示从当前区域采集所得到的温度；
3.定温报警：根据用户要求设置报警和预警温度，并可对被监控区域分段设置不同分区，每个分区可以任意设置报警值，对不同的部位进行不同标准的监控；
4.温升速率报警：被监控的区域达到按用户要求设置的温升速率预定值时，可以报警、指出报警区域所处的位置并做数据储存和打印
5.历史数据显示：用户可以通过历史数据查询得到区域某时某刻、某点的温度、某时段的温度、最高温度；
6.特性曲线显示：包括某时某刻温度分布曲线、某时段某点的温度变化曲线、某时段最高温度变化曲线；
7.远程监控诊断和维修：通过因特网，可实现对现场设备的远程监控、诊断和维修等。
8.探测系统实时监测，具有良好的响应特性。
9.温度的实时监控，实时显示每隔1米各点的温度变化。连续监测信号，任意温度点报警。
10.DTS光纤探测系统内部自带PC机，在WINDOWS环境下由工程师调试编程来完成。设定区域长度及报警点，系统校订均可采用Windows 2000版本软件来完成。
11.DTS光纤探测系统是一个连续的监测信号，可设置多级定温报警和多级差温报警，或是两者的结合，基本消除误报，同时可根据现场要求对报警值进行修正。
12.可针对环境变化设置最多可达200个不同报警控制区域，报警控制区可编程，并可按照用户的要求进行设计，每个单独的报警区域可设置不同的报警值。
13.如果探测光纤受损，DTS光纤探测系统可以即时定位受损点，并通过重新迅速恢复系统，这对于有效的实施在线监测时非常重要的；
14.DTS光纤探测系统的温度信号和报警信号可以上传到消防主机和中控室。
The product system characteristics:
Characteristics and technical index of the system
The real-time monitoring of temperature, to achieve early warning;
The fast:
System temperature, speed of positioning is very high. In order to improve the measuring time, feather state using satellite ground photograph data filtering technology, to solve the problem of massive digital filter;
Laser emission device system within the host transmit tens of thousands of times per second pulse of light, and the sampling temperature average value of output to the display system, the basic elimination of error.
The distribution characteristics of:
Linear optical fiber temperature sensing fire monitoring system for distributed optical fiber temperature measurement system, which can provide continuous dynamic monitoring over ten kilometers within every 1 meters each point temperature change signal, can be arbitrarily set at various levels of temperature alarm value.
The advanced nature:
The system is currently the world's highest, the strongest performance index function, high reliability, the most advanced technology products. Optical components is used by imported components of nano technology production out of the digital processing chip is used for military grade devices on the century 90 time end.
The accuracy of:
The temperature resolution of the system reaches 0.1 DEG C, the temperature accuracy of plus or minus 1 DEG C; positioning accuracy up to plus or minus 1m.
The flexibility of:
Linear optical fiber temperature sensing fire monitoring system is on-line monitoring;
At any point of the alarm signal is uploaded to the fire alarm controller time monitoring range of not more than 30 seconds;
The system of the host can provide relay interface (passive dry contact) in the fire alarm controller alarm, provides a set of dry contact alarm signal according to the interval;
Provided by the monitoring system is a continuous dynamic monitoring signals, the system can set the temperature point alarm system to support multi-level multi-level alarm alarm, such as at the beginning of 40 C 30 C, warning, 50 C measures according to different environments, and can alarm temperature parameter setting;
To avoid false positives occur, according to the change of temperature before the accident rate high characteristic, can set the temperature change rate threshold monitoring in the alarm setting, when monitoring the temperature change rate is greater than the alarm signal of the value, and provides a signal corresponding to the output;
A variety of alarm conditions, as long as meet the one, the system will immediately generate alarm. According to the on-site requirements to adjust the sampling interval, the shortest sampling interval of 1 meters;
Alarm control zone programmable, and can be designed according to user requirements, each system based on environmental changes is no less than 100 different alarm control area.
产品系统特性：
系统特点和技术指标
温度的实时监控，做到早期预警；
◆快速性：
系统测温、定位速度非常高。为了提高测量时间，羽邦采用了卫星地面拍照数据滤波技术，以解决海量数字滤波优化问题；
系统主机内的激光发射装置每秒钟发射上万次的光脉冲，并将取样温度的平均值输出到显示系统，基本消除误差。
◆分布特性：
线型光纤感温火灾监测系统为分布式光纤测温系统，可提供连续动态监测长达十几公里范围内每隔1米各点的温度变化信号，可任意设置各级温度报警值。
◆先进性：
该系统是世界上目前性能指标最高、功能性最强、可靠性最高、技术最先进的产品。采用的光元器件是通过纳米技术生产出来的进口器件，数字处理芯片采用的是上世纪90年代末的军用级器件。
◆准确性:
该系统的温度分辨率达到0.1℃，温度精度±1℃；定位精度达±1m 。
◆灵活性:
线型光纤感温火灾监测系统是在线监测方式；
监测范围内任何一点的报警信号上传至火灾报警控制器的时间不大于30秒；
本系统的主机可提供继电器接口（无源干接点）在火灾报警控制器上进行报警，可按区间提供一组干接点报警信号；
监测系统提供的是一个连续的动态监测信号,系统可设置多级温度点报警即系统支持多级报警，如30℃初报警,40℃预报警,50℃采取措施等，并且可以根据环境不同进行报警点温度参数设定；
为避免误报发生，针对事故发生前的温度变化率大的特点,在报警设置中可设置温度变化率阀值进行监测,当监测到温度变化率大于该值时发出报警信号,并提供相应的信号输出；
多种报警条件，只要满足一条，系统就会立即产生报警。可根据现场要求对取样间隔进行调整，最短取样间隔为1米；
报警控制区可编程,并可按照用户的要求进行灵活设计，每一系统可针对环境变化可设置不小于100个不同报警控制区域。
1 compatibility:
Linear optical fiber temperature sensing fire monitoring system of the host for the open communication protocols, communication interface and workstations connected, in the central control room alarm workstations in a graphic way finished display temperature curve, alarm information, alarm temperature all position;
The system can through the RS232, LED, relay, built-in Ethernet or other industrial protocol output form and PC, fire alarm system and other control equipment is linked, acousto-optic alarm signal output is accurate, complete;
Linear optical fiber temperature sensing fire monitoring system according to different region, grading alarm output signal, in order to adapt to the needs of different control panel;
Optical fiber temperature measurement host control unit, flexible networking, large compatibility. According to user needs can also be networked with other SCADA control equipment, power supply equipment in the power automation system, management system, etc.. Realize the integrated intelligent system in safety, economy, management as a whole;
Optical fiber temperature measurement host control unit and can expand the dial-up modem, optical fiber interface conversion mode, the realization of the personalized demand.
The safety:
Software license management system, safe and reliable;
Allows the user to the system in the future upgrades and maintenance update;
Linear optical fiber sense warning system temperature fire have safety record function, can store all the historical data since the system is running, and can use the portable computer to download the data;
If the fiber damage, the system can locate the damaged, with self diagnostic function, and fusion is performed through the optical fiber fusion splicer, which is very important for online monitoring of the implementation of effective;
Laser grade 3A;
Detection of optical fiber is safe and reliable, with light signal, cause mutual electromagnetic interference between will and power cable.
Compared with traditional sensors, distributed optical fiber temperature measurement system has natural advantage, mainly including:
1 continuous distributed measurement
Distributed optical fiber sensor is truly distributed measurements, can along the measurement information detection cable tens of kilometers continuous, false positive rate and false negative rate is greatly reduced. At the same time to realize real-time monitoring.
2 anti electromagnetic interference, can work normally in high electromagnetic environment.
The optical fiber itself is composed of quartz material, complete electrical insulation; at the same time signal of optical fiber sensor is based on optical fiber as a carrier, intrinsic safety, free from any interference from external electromagnetic environment.
The 3 intrinsic lightning protection.
Lightning often destroy large electric sensor. Optical fiber sensor from complete electrical insulation, can withstand high voltage and high current impact.
4 measurement of distance, which is suitable for remote monitoring.
Two outstanding advantages of optical fiber is the transmission of large amount of data and the loss is small, without relay case, can realize remote monitoring of tens of kilometers.
5 high sensitivity, high accuracy of measurement.
The theory on the sensitivity and measuring accuracy of optical fiber sensor is better than the most general sensor, actually has a mature product also proved this point.
6 long life, low cost, simple system.
Fiber material is generally quartz glass, which has the characteristics of no corrosion, fire resistance, water resistance and long service life, can usually be served for 30 years. Considering the sensor's own cost and maintenance costs, the use of optical fiber sensor can greatly reduce the operating cost of the whole project final.
1. 兼容性：
线型光纤感温火灾监测系统的主机为开放通信协议，提供与工作站联接的通信接口，在中央控制室防灾报警工作站以汉化的图文方式显示温度曲线、报警位置、报警温度等全部信息；
系统可以通过RS232、LED、内置继电器、以太网或其它工业协议等输出形式与PC、消防报警系统等其它控制设备进行连动，进行声光报警，信号输出准确、完整；
线型光纤感温火灾监测系统可根据不同报警区分段、分级输出信号，以适应不同控制盘的需要；
光纤测温主机控制单元组网灵活，兼容性大。根据用户需求还可与SCADA、供电设备中的电力自动化系统、管理系统等其他控制设备进行连网。实现集安全、经济、管理为一体的大的综合智能系统；
光纤测温主机控制单元拓展后可实现拨号modem、光纤接口转换方式等，实现用户个性化的需求。
◆安全性：
系统软件授权管理，安全可靠；
用户可以对系统今后的升级和维护进行更新；
线型光纤感温火灾预警系统具备安全记录功能，可储存系统运行以来的所有历史数据，并可使用便携式计算机下载有关数据；
如果光纤受损，系统可以定位受损点，具有自诊断功能，并通过光纤熔接机对其进行熔接，这对于有效的实施在线监测是非常重要的；
激光等级达到3A级；
探测光纤安全、可靠，采用光信号，不会与动力电缆之间产生相互电磁干扰。
1. 连续分布式测量
分布式光纤传感器是真正的分布式测量，可以连续的得到沿着探测光缆几十公里的测量信息，误报和漏报率大大降低。同时实现实时监测。
2. 抗电磁干扰，在高电磁环境中可以正常的工作。
光纤本身是由石英材料组成的，完全的电绝缘；同时光纤传感器的信号是以光纤为载体的，本征安全，不受任何外界电磁环境的干扰。
3. 本征防雷。
雷电经常破坏大量的电测传感器。光纤传感器由于完全的电绝缘，可以抵抗高电压和高电流的冲击。
4. 测量距离远，适于远程监控。
光纤的两个突出优点就是传输数据量大和损耗小，在无需中继的情况下，可以实现几十公里的远程监测。
5. 灵敏度高，测量精度高。
理论上上大多数光纤传感器的灵敏度和测量精度都优于一般的传感器，实际已成熟的产品也证明了这一点。
6. 寿命长，成本低，系统简单。
光纤的材料一般皆为石英玻璃，其具有不腐蚀、耐火、耐水及寿命长的特性，通常可以服役30年。综合考虑传感器的自身成本以及以后的维护费用，使用光纤传感器可以大大降低整个工程的最终经营成本。
ELECTRIC
