Multi-sensory microwave photonic address measuring system for intestinal manometry

Abstract

Solutions for a multi-sensor catheter in high resolution manometry based on classical interrogation with wave separation of fiber optic sensors or their polyharmonic probing already exist. Measuring systems based on interrogating arrays of the same type of Bragg gratings by the method of interference with a frequency shift and spatial separation of obtaining information from each grating separately, although their spatial resolution is slightly lower than required, are proposed. The indicated type of solutions requires expensive tunable lasers or narrow-band filters, and frequency-shifted interference, including two-frequency, with a microwave photonic interrogation method, entails the construction of an extremely complex interferometric optoelectronic circuit with the need to ensure its stable operation. Supplementing the task with the requirement to simplify and reduce the cost of the system as much as possible by means of microwave photonic sensing methods and using an array of structured gratings or gratings with phase shift in the system, and, finally, addressable fiber Bragg gratings, which we are actively developing, we will get a complete statement of the problem of constructing a multi-sensor catheter for intestinal manometry. The results of these task solutions are presented in this article.