Narendran N, Corbo M A, Smith W
Mechanical Technology Incorporated, Latham, New York 12110, USA.
ASAIO J. 1996 Sep-Oct;42(5):M500-6. doi: 10.1097/00002480-199609000-00037.
In vivo measurement of blood pressure is critical in many settings, including patient care, medical research, and control of cardiovascular assist and replacement devices. This article describes a pressure sensor based on fiber optic, white light interferometry. An optical interference filter formed between the end face of an optical fiber and the sensing diaphragm selectively reflects a wavelength component. A low cost, thin film optical wedge interferometer placed at the output end detects the wavelength of the reflected signal, which represents a unique cavity length of the interference filter directly related to the diaphragm deflection and, therefore, pressure. Several key features of this sensing scheme include low drift, high accuracy, and insensitivity to light loss factors along the length of the optical fiber. This fiber optic pressure sensor promises significant advances as a medical monitoring tool, a research instrument, and a component of cardiovascular assist and replacement devices. A prototype pressure gauge has been built, and the feasibility of the optical approach verified. Experimental results of the prototype gauge for resolution, repeatability, and drift and a preliminary design for a high resolution, low drift, miniature fiber optic pressure probe are presented herein.
在包括患者护理、医学研究以及心血管辅助和替代设备控制等许多情况下，体内血压测量都至关重要。本文介绍了一种基于光纤白光干涉测量法的压力传感器。在光纤端面与传感膜片之间形成的光学干涉滤光片选择性地反射一个波长分量。置于输出端的低成本薄膜光学楔形干涉仪检测反射信号的波长，该波长代表与膜片挠度直接相关的干涉滤光片的独特腔长，进而与压力相关。这种传感方案的几个关键特性包括低漂移、高精度以及对沿光纤长度方向的光损耗因素不敏感。这种光纤压力传感器有望在作为医疗监测工具、研究仪器以及心血管辅助和替代设备的部件方面取得重大进展。已制造出一个原型压力计，并验证了该光学方法的可行性。本文给出了原型压力计在分辨率、重复性和漂移方面的实验结果以及一种高分辨率、低漂移微型光纤压力探头的初步设计。
