title: Underwater blast wave pressure sensor based on polymer film fiber Fabry-Perot cavity.
abstract: This paper describes the theoretical and experimental aspects of an optical underwater shock wave sensor based on a polymer film optical fiber Fabry-Perot cavity manufactured by vacuum deposition technology. The transduction mechanism of the sensor involves a normally incident acoustic stress wave that changes the thickness of the polymer film, thereby giving rise to a phase shift. This transient interferometric phase is interrogated by a three-phase-step algorithm. Theoretically, the sensor-acoustic-field interaction principle is analyzed, and the phase modulation sensitivity based on the theory of waves in the layered media is calculated. Experimentally, a static calibration test and a dynamic calibration test are conducted using a piston-type pressure calibration machine and a focusing-type electromagnetic shock wave. Results indicate that the repeatability, hysteresis, nonlinearity, and the overall measurement accuracy of the sensor within the full pressure range of 55 MPa are 1.82%, 0.86%, 1.81%, and 4.49%, respectively. The dynamic response time is less than 0.767 μs. Finally, three aspects that need further study for practical use are pointed out.
authors.forename: Junjie
authors.initials: J
authors.lastname: Wang
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
authors.forename: Li
authors.initials: L
authors.lastname: Peng
authors.forename: Minghong
authors.initials: M
authors.lastname: Yang
authors.forename: Minghe
authors.initials: M
authors.lastname: Xia
authors.forename: Desheng
authors.initials: D
authors.lastname: Jiang