Studies on measurement of chloride ion concentration in concrete structures with long-period grating sensors
Studies on measurement of chloride ion concentration in concrete structures with long-period grating sensors
复制标题
长周期光栅传感器测量混凝土结构中氯离子浓度的研究
DOI：
10.1117/12.658900
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发表时间：
2006
影响因子：
1.3
通讯作者：
Jian
中科院分区：
文献类型：
--
作者：
Jaw;Tsung;H. Chang;Jian
报道了一种用于混凝土结构氯离子浓度测量的简单、低成本的长周期光栅(LPG)传感器的研制和演示。液化石油气传感器对传感光栅包层周围介质的折射率非常敏感，因此可以作为环境折射率传感器或化学浓度指示器，具有很高的稳定性和可靠性。对浸泡在不同质量浓度(0%~20%)的盐水中的混凝土样品中的氯离子浓度进行了测量，结果表明，LPG传感器的传输损耗和共振波长漂移随着浓度的增加呈线性下降。对水溶液中盐浓度的测量精度估计为0.6%，对氯离子的检出限约为0.04%。为了进一步提高其对氯化物浓度的灵敏度，我们在液化石油气传感器的栅面上涂覆了金纳米颗粒。这种传感机制是基于自组装的Au胶体在LPG的光栅处的局域表面等离子体共振的敏感性。用这种方法，检测化学溶液浓度的灵敏度提高了一倍。这种传感器的优点是结构相对简单，使用方便。此外，该传感器具有现场、活体和遥感的潜在能力，并具有一次性传感器的潜在用途。
We report the development and demonstration of a simple and low-cost long-period grating (LPG) sensor for chloride ion concentration measurement in concrete structures. The LPG sensor is extremely sensitive to the refractive index of the medium surrounding the cladding surface of the sensing grating, thus allowing it to be used as an ambient index sensor or chemical concentration indicator with high stability and reliability. We have measured chloride ion levels in a concrete sample immersed in salt water solution with different weight concentration ranging from 0 % to 20 %, and results showed that the LPG sensor exhibited a linear decrease in the transmission loss and resonance wavelength shift when the concentration increased. The measurement accuracy for concentration of salt in water solution is estimated to be 0.6 % and the limit of detection for chloride ion is about 0.04 %. To further enhance its sensitivity for chloride concentrations, we have coated gold nanoparticles on the grating surface of the LPG sensor. The sensing mechanism is based on the sensitivity of localized surface plasmon resonance of self-assembled Au colloids on the grating portion of the LPG. With this method, a factor of two increases in sensitivity of detecting chemical solution concentrations was obtained. The advantage of this type of the sensor is relatively simple of construction and ease of use. Moreover, the sensor has the potential capability for on-site, in vivo, and remote sensing, and has the potential use for disposable sensors.