摘要
A wavelength modulation based fiber optic sensor is used to measure salt concentration and temperature. The sensor consists of a biconical fiber filter. Theoretically, the wavelength shift response of the sensor is linearly related to changes in the refractive index of the external medium surrounding the sensor in a specific region. The device sensitivity is enhanced by reducing the radius of the taper waist. The theoretical predictions are confirmed by experimental results. A wavelength modulation based all fiber sensor demonstrated salt concentration and temperature measurements with errors of 0 05% (mass fraction) and 0 2℃, respectively. The differential modulation of the pass or notch bands in a biconical fiber filter may be used for simultaneous sensing of salt concentration and temperature.
A wavelength modulation based fiber optic sensor is used to measure salt concentration and temperature. The sensor consists of a biconical fiber filter. Theoretically, the wavelength shift response of the sensor is linearly related to changes in the refractive index of the external medium surrounding the sensor in a specific region. The device sensitivity is enhanced by reducing the radius of the taper waist. The theoretical predictions are confirmed by experimental results. A wavelength modulation based all fiber sensor demonstrated salt concentration and temperature measurements with errors of 0 05% (mass fraction) and 0 2℃, respectively. The differential modulation of the pass or notch bands in a biconical fiber filter may be used for simultaneous sensing of salt concentration and temperature.
