研究了一种用于颅内压测量的膜片式光纤法布里-珀罗压力传感器。外玻璃管和用于光纤准直的内玻璃管采用UV胶粘接, 构成空气腔。在空气腔的一端粘接石英膜片, 另一端插入多模光纤, 石英膜片和光纤端面的两个反射面构成法珀干涉腔。制作了两种不同尺寸的传感器, 在0~25kPa的压力测量范围内, 灵敏度高达39.2nm/kPa, 压强测量分辨率为133Pa, 线性拟合度为99.9%, 具备生物兼容性, 满足人体颅内压测量的需求。与商用的颅内压测量传感器相比, 该传感器制作方法简单、成本低廉。

The monitoring of increased intracranial pressure (ICP) is necessary in the diagnosis and treatment of patients with neurological disease because it can provide an insight into the mechanism of the head injury. In this letter, we develop a novel miniature Fabry–Perot (F-P) sensor for ICP measurement. The proposed sensor is fabricated by using a commercially available fusion splicer and a fiber cleaver, by which many difficult art problems involved in fabrication are solved and the online monitoring of the F-P cavity is actualized. The sensor exhibits a linear response to the applied pressure over the range of 0–25 kPa (ample for ICP measurement), with a sensitivity of 10.18 nm/kPa, a resolution of 0.1 kPa, and a reduced thermal sensitivity of 0.068 nm/°C, which shows it can meet the requirements of ICP measurement.

An all-metal 3-component optical fiber seismometer was proposed and experimentally demonstrated. The theoretical analysis was given based on the electro-mechanical theory. Calibration results showed that the axis sensitivity was about 41 dB (re: 0 dB=1 rad/g) with a fluctuation ±2 dB in the frequency bandwidth of 5 Hz - 400 Hz. A transverse sensitivity of about -40 dB was achieved. The fluctuation of the acceleration sensitivity for the three accelerometers in the seismometer was within ±2.5 dB. The minimum phase demodulation detection accuracy of the phase-generated carrier (PGC) was 10-5 rad/√Hz, and the minimum detectable acceleration was calculated to be 90 ng/√Hz.