Experiments are performed toward the development of a fiber optic pressure sensor which uses the elasto-optic birefringence in a single-mode fiber. The 'side-hole' fiber-structure may be viewed as a PANDA-structure with open channels instead of the stress generating rods in its cross-section. The use of the side-hole fiber exploits the high reproducibility of silica serving as the elastic reference. By the side-hole geometry external hydrostatic pressure is converted into an anisotropic stress in the core region. Additionally, a stress concentration by a factor of 3 to 5 can be achieved by suitable choice of the geometry of the channels. In the experimental setup, the fiber is exposed in a pressure chamber directly to the pressure to be measured. The chamber is designed for a pressure range of 0 to 1000 bars.The induced birefringence is determined by passing a polarized laser beam through the fiber and by bi-directional counting the periods of phase delay between the two polarization-eigenstates of the fiber at the output. Thus, the sensor operates in an incremental mode. Using a fiber length of 10 cm, a pressure induced birefringence of 7.78 rad/(bar-m) was measured at a wavelength of 1300 nm. The resolution of optical phase evaluation is ni2, corresponding to a pressure resolution of approx. 2 bars. The overall accuracy of the sensor is better than ± 0.5% in the pressure range of 100-1000 bars where unambiguous phase evaluation was possible. Below 100 bars, in one fiber problems were caused near the point where the the birefringence vanishes. The experimental sensor-head is connected to the evaluation unit by a polarization-maintaining single-mode fiber, supplying the laser light, and three electrical leads for the detector signals. A version without any electrical lead to the sensor head is planned, in which the light source and the signal detectors are connected by optical fibers.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    High Pressure Fiber-Optic Sensor With Side-Hole Fiber


    Contributors:

    Conference:

    Fiber Optic Sensors II ; 1987 ; The Hague,Netherlands


    Published in:

    Publication date :

    1987-10-14





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    Fiber optic pressure sensor

    Ingold, Joseph P. / Sun, Mei H. / Bigelow, Russell N. | SPIE | 1991


    High-pressure fiber optic acoustic sensor

    Huang, Zhengyu / Deng, Jiangdong / Peng, Wei et al. | SPIE | 2004


    Interferoaetric Fiber Optic Pressure Sensor

    Dawei, Liang / Shanglian, Huang | SPIE | 1990


    Fiber Optic Pore Pressure Sensor Development

    Grossman, B.G. | Online Contents | 1994