非膜片式全光纤结构音频传感器

Membrane-free All-fiber Acoustic Sensor

提出并制作了一种基于法布里珀罗腔的非膜片式全光纤结构音频传感器。通过对该音频传感器的音频信号响应特性进行测试,实验结果表明该传感器在噪声限制下,最小可检测声压可达38.9μPa/Hz^(1/2),且由于采用是全光纤结构因而具有良好的温度稳定性,相比于膜片式光纤音频传感器,其结构简单,容易制作,并且具有良好的线性声压响应等优点,表明该传感器在音频检测领域具有潜在的应用价值。

A membrane-free all fiber acoustic sensors based on a fiber-optic Fabry-Perot cavity is proposed and demonstrated. The acoustic response properties of the proposed sensor were exploited and the experimental results show that under the noise limit, the minimum acoustic pressure of the sensor can be detected up to 38.9 μPa/Hz1/2. Meanwhile, the sensing probe has a good temperature stability benefiting from its all-fiber structure. Compared with the sensors based on the acoustic sensing diaphragm, the proposed sensor possesses a simple structure, easy to make and has good linear response to acoustic pressure, which implies that such sensors can be widely used as microphone in applications of high acoustic pressure fields.