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标签归档:光纤传感

  1. 用于光学传感的可调谐光波

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    OFS AcoustiS实体® 光纤s used in r和om OPO system demonstration 

    再一次, OFS光纤 are paving the way for researchers to bring cutting-edge technology out of the lab 和 into practical applications. This time, we’re delving into the realm of 光纤传感 – a technology that relies on a carefully tuned light source with specific traits like wavelength, 权力, 脉冲宽度. 

    Generally 光纤传感 starts with a laser, but they come with a catch: lasers have their materials carefully selected to emit stable light pulses at a specific desired wavelength, 限制他们的灵活性. A system with wavelength modulation promises exciting innovations for fields as diverse as quantum computing 和 激光雷达遥感.  

    OPOs can use the deliberate scattering in AcoustiS实体 optical fiber to change the wavelength of light pulses.
    OPOs can use the deliberate scattering in AcoustiS实体 optical fiber to change the wavelength of light pulses

    Enter the optical parametric oscillator (OPO). It transforms regular laser light into controlled wavelength pulses by guiding the laser light into an optical cavity, bouncing it around nonlinear crystals 和 resonators. As the light moves through the cavity 和 is sent back over itself multiple times the system changes wavelengths 和 creates parametric amplification.  

    然而, there’s a hiccup in this dazzling performance: OPOs are quite s实体itive to temperature 和 environmental changes. Even small changes impact the wavelength 和 权力 of the light as it exits the cavity, confining OPOs mostly to high-maintenance lab settings. 

    研究人员推测,随机激光, which encourages scatter in the light source, would make the system more robust because the scattering would come from the controlled design of the laser 和 not be at the mercy of environmental changes in the optical cavity. 

    A groundbreaking paper from the University of Ottawa 验证了这个概念. A team demonstrated, for the first time, that an augmented s实体ing optical fiber like OFS’ AcoustiS实体 能让这个想法成为现实吗. AcoustiS实体 is manufactured with enhanced Rayleigh scattering 和 this scattering allowed the OPO system to have stable, tuned wavelengths in a simple 和 robust optical cavity. 

    Congratulations to the University of Ottawa team 和 to all the technologists working to unshackle OPOs from the lab. 

  2. 光纤 “S实体es” Change in Surroundings

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    Companies use optical fiber as a s实体or to detect changes in 温度和压力. This technique is often used to monitor structures including bridges 和 gas pipelines.

    Now researchers at Ecole Polytechnique Fédérale De Lausanne (EPFL) have discovered a new method where 光纤 can identify when they are in contact with a liquid or a solid. The researchers accomplished this by generating a sound wave with help from a light beam inside the optical fiber.

    一种不会干扰光线的传感器

    Four factors affect the light carried by a glass optical fiber: int实体ity, 阶段, 偏振和波长. These factors can change when something stretches the fiber or the temperature varies. 这些变化 让纤维充当传感器 by detecting cracks in structures or temperature changes. 然而, 直到现在, users could not know what was actually happening around the fiber without letting light escape, 是什么阻断了光的路径.

    The method from EPFL uses a sound wave generated inside the fiber. This hyper-frequency wave regularly bounces off of the fiber’s walls. This echo varies at different locations depending on the type of material that the wave contacts. The echoes leave an imprint on the light that users can read when the beam exits the fiber. While users can study this imprint to detect 和 map out the fiber’s surroundings, it is so faint that it barely disturbs the light within the fiber. 事实上, users could employ this technique to s实体e what is occurring around a fiber 和 send light-based information at the same time.

    在实验中, the researchers submerged their fibers in water 和 then in alcohol, 然后把他们丢在外面. Each time, their system correctly identified the change in the fibers’ surroundings. The group expects their technique to have many potential applications by detecting water leakage, as well as the d实体ity 和 salinity of fluids that touch the fiber.

    时空检测

    This method discerns changes in the surroundings with a time-based method. Each wave impulse is created with a slight time jag. Then, when the beam arrives, the delay is reflected. The researchers can see what any disturbances were 和 determine their location. The group can currently locate disturbances to within 10 meters, but have the technical means 和 expect to increase accuracy down to one meter.

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