A Novel Fiber-Optic Tapered Long-Period Grating Sensor for Pressure Monitoring

Abstract

Abstract-The method and the required installations for fabricating tapered long-period fiber gratings can be simpler than that of standard fiber Bragg gratings, and the fabrication process is faster. To our knowledge, the tapered long-period fiber grating pressure sensor is presented here for the first time. In this paper, the fabrication method for tapered long-period fiber gratings, the sensing principle, the sensor structure, the measurement setup, and the preliminary results are presented and discussed. The pressure sensitivity of the sensor is as high as 5.1 pm/bar. Index Terms-Fiber-optic sensors, long-period fiber gratings, pressure calibration and measurement, step index fiber, tapered long-period gratings (TLPGs), temperature.

Fiber Bragg Grating Sensors for Mainstream Industrial Processes

“…Bock et al [70] reported a tapered long period Bragg grating pressure sensor with a pressure sensitivity of 51 pm/MPa, which was significantly greater than a bare standard FBG. LPGs have the potential to have custom designed sensitivities, however, the manufacturing process is usually expensive and time consuming.…”

Optical effect of diamond‐like carbon film coating of long‐period optical fiber gratings

“…The fiber consists of Gedoped fused silica core, fused silica cladding and exterior polymer coating that could be mechanically removed. Gratings were manufactured using a computer-assisted arc discharge system [6,7]. The method is based on periodic melting and re-solidifying of areas of the fiber in order to create refractive index variation and slight periodic tapering.…”

A highly sensitive fiber Bragg grating diaphragm pressure transducer

“…They report a sensitivity of 31.67 nm/ MPa and 3.55 nm/MPa, respectively. Pressure sensors using long period gratings [15] and microstructured optical fibers [16] have also been demonstrated.…”