本文提出了一种基于锥形多芯光纤的超声波传感器并将其用于地震物理模型成像

This paper proposes an ultrasonic sensor based on tapered multi-core optical fiber and uses it for seismic physical model imaging. The sensor is a cascade of SMF-TMCF-SMF encapsulated on a polyurethane rod. In the sensing structure, the distance between the cores of the multi-core fiber is reduced due to the decrease of the fiber diameter in the fusion taper area of ​​the TMCF, which induces the coupling of various modes. Polyurethane rods close to the underwater acoustic impedance are selected as the packaging material of the tapered multi-core optical fiber to ensure that the ultrasonic waves can be better received by the sensor.

In this paper, an ultrasonic sensor based on tapered multi-core optical fiber is proposed and applied to seismic physical model imaging. The sensor is a cascade of smf-tmcf-smf encapsulated on polyurethane rod. In the sensing structure, due to the decrease of the fiber diameter in the fused cone region of TMCF, the distance between several cores of the multi-core fiber decreases, which leads to the coupling of two modes. The polyurethane rod which is close to the underwater acoustic impedance is selected as the packaging material of the tapered multi-core optical fiber to ensure that the ultrasonic wave can be better received by the sensor.<br>

In this paper, an ultrasonic sensor based on tapered multi-core fiber is proposed and applied to seismic physical model imaging. The sensor is a cascade of SMF-TMCF-SMF encapsulated on polyurethane rod. In the sensing structure, the distance between several cores of multi-core fiber decreases due to the decrease of fiber diameter in the fused cone region of TMCF, which leads to the coupling of various modes. Polyurethane rod with close underwater acoustic impedance is selected as the packaging material of tapered multi-core optical fiber to ensure that ultrasonic wave can be better received by the sensor.