Fabry–Perot Interferometric Fiber-Optic Sensor for Rapid and Accurate Thrombus Detection

Abstract

We present a fiber-optic sensor based on the principles of a Fabry–Perot interferometer (FPI), which promptly, sensitively, and precisely detects blood clot formation. This sensor has two types of sensor tips; the first was crafted by splicing a tapered fiber into a single-mode fiber (SMF), where fine-tuning was achieved by adjusting the tapered diameter and length. The second type is an ultra-compact blood FPI situated on the core of a single-mode fiber. The sensor performance was evaluated via clot-formation-indicating spectrum shifts induced by the varied quantities of a thrombin reagent introduced into the blood. The most remarkable spectral sensitivity of the micro-tip fiber type was approximately 7 nm/μL, with a power sensitivity of 4.1 dB/μL, obtained with a taper fiber diameter and length of 55 and 300 μm, respectively. For the SMF type, spectral sensitivity was observed to be 8.7 nm/μL, with an optical power sensitivity of 0.4 dB/μL. This pioneering fiber-optic thrombosis sensor has the potential for in situ applications, healthcare, medical monitoring, harsh environments, and chemical and biological sensing. The study underscores the scope of optical technology in thrombus detection, establishing a platform for future medical research and application.

Application of Optical Fiber Sensing Technology and Coating Technology in Blood Component Detection and Monitoring

“…In addition to the above-mentioned fiber optic sensors used for blood flow, flow velocity, S p O 2 , PWA, and other fields of monitoring, fiber optic sensors have also made progress in the monitoring of other physical characteristics of blood, such as blood viscosity [172], thrombosis detection [173], etc. In the future, the application of fiber optic sensors will continue to develop in the direction of more comprehensive blood detection.…”

The role of optical fiber sensors in the new generation of healthcare devices: a review

“…4 shows a schematic representation of the optical circuit of Mach–Zehnder, Michelson, Sagnac, and Fabry–Pérot interferometers in optical fibers. Furthermore, by analyzing the modulation of the interference pattern for external perturbations, these techniques can be used in the monitoring of respiration, 102 the arterial pulse wave sensor, 103 the monitoring of human physiological activity 104 and the detection of thrombus, 105 as examples (shown in Fig. 4).…”