产品介绍
The Brillouin distributed fiber optic temperature and strain sensor BOTDA adopts internationally advanced Brillouin optical time-domain analysis technology and is a new generation of distributed sensors. This sensor uses ordinary communication single-mode optical fiber, which is both a transmission medium and a sensing element. By laying the optical fiber on the object to be measured, real-time temperature and strain distribution information of each point on the fiber can be obtained, achieving continuous online monitoring and precise positioning over long distances.
This BOTDA integrates high-tech such as optoelectronics, hardware, computer, and information processing, with a measurement distance of up to 100km, temperature measurement accuracy of 1 ℃, and strain measurement accuracy of 20 μ ε; At the same time, due to the use of optical signals as carriers, they are not affected by electromagnetic interference, are inherently safe, have a long service life, and are suitable for working in harsh environments. They have important applications in fields such as underwater optoelectronic composite cables, overhead power lines, long-distance oil and gas pipelines, bridges, dams, and geological hazard monitoring.
测量原理
When light is transmitted in optical fibers, scattering occurs due to the non-uniformity of the density and refractive index of the fiber material. Brillouin scattering is the process of light scattering caused by the interaction between light waves and sound waves propagating in optical fibers. When the ambient temperature changes or the optical fiber undergoes deformation, both the speed of sound and the refractive index of light in the fiber will change accordingly, resulting in a change in the Brillouin frequency shift, and the change in Brillouin frequency shift is linearly related to temperature and strain.
BOTDA is based on the stimulated Brillouin scattering effect, utilizing the interaction between pump light, probe light, and sound waves to continuously amplify the backward Brillouin scattering signal. Continuous scanning of the frequency difference between the pump light pump and the probe light probe can determine the Brillouin frequency shift at different positions of the fiber, thereby obtaining the temperature and strain distribution information of the entire fiber.
技术优势
- 连续分布式温度测量，无测量盲区
- 光纤是一种集传输与传感于一体的传感器
- Measuring distance is long
- Single ended installation method, easy to install
- Can accurately locate the location of the fire
- 光信号传输，完全电气绝缘，抗电磁干扰
- Fast measurement speed
- 本质安全型，适用于在易燃易爆环境中长期作业
- 测量稳定可靠，误报率低
性能特征
- Real time distributed temperature and strain measurement
- Measurement distance: 5-100km
- Fast measurement time: as low as 20 seconds
- High measurement accuracy: 1 ℃, 20 μ ε (0.002%)
- 一款提供可视化界面的、易于使用的软件
- High spatial resolution: 0.5-3m
