本文提出一种用于地震物理模型成像的多芯锥形光纤超声波传感器，并对其性能

This paper proposes a multi-core tapered optical fiber ultrasonic sensor for seismic physical model imaging, and tests its performance. The sensor is manufactured by a flame-cone method, and the manufacturing process is simple and low in cost. Encapsulate the sensor on a polyurethane rod, change the previous measurement method of the cone sensor, and realize the point measurement of the cone sensor. Four-core fiber and seven-core fiber are used to make sensors with cone diameters of 11 μm, 22 μm, and 29 μm, respectively. Since the test experiment is carried out underwater, when the diameter of the cone is too small, the spectrum of the sensor will change greatly during the process of entering the water. In this paper, a multi-core optical fiber ultrasonic sensor with a cone diameter of 22 μm is used to test the response of the four-core tapered optical fiber ultrasonic sensor and the seven-core tapered optical fiber ultrasonic sensor to ultrasonic under the same experimental conditions. Demodulation of the ultrasonic signal

In this paper, a multi-core tapered optical fiber ultrasonic sensor for seismic physical model imaging is proposed, and its performance is tested. The sensor is made by the way of flame taper, and the manufacturing process is simple and the cost is low. The sensor is packaged on a polyurethane rod, and the previous measurement method of the conical sensor is changed to realize the point measurement of the conical sensor. Four core fiber and seven core fiber are used to make the taper with diameters of 11 μ m、22 μ M and 29 μ M sensor. Because the experiment is carried out underwater, when the cone diameter is too small, the spectrum of the sensor will change greatly in the process of entering water. The diameter of the cone is 22 μ Under the same experimental conditions, the response of four core tapered fiber ultrasonic sensor and seven core tapered fiber ultrasonic sensor to ultrasonic wave is tested, and the ultrasonic signal received by the sensor is demodulated by the side band filtering method<br>

In this paper, a multi-core tapered optical fiber ultrasonic sensor for seismic physical model imaging is proposed, and its performance is tested. The sensor is made by flame cone drawing, which has simple manufacturing process and low cost. The sensor is packaged on a polyurethane rod, which changes the previous measurement mode of the conical sensor and realizes the point measurement of the conical sensor. Sensors with cone diameters of 11 μm, 22 μm and 29 μm were made by using four-core fiber and seven-core fiber. Because the test experiment is carried out underwater, when the diameter of cone area is too small, the spectrum of the sensor will change greatly in the process of entering water. In this paper, multi-core optical fiber ultrasonic sensor with cone diameter of 22 μm is selected to test the response of four-core conical optical fiber ultrasonic sensor and seven-core conical optical fiber ultrasonic sensor to ultrasonic wave under the same experimental conditions, and the ultrasonic signal received by the sensor is demodulated by sideband filtering method