Interrogation procedure for double addressed fiber Bragg structures as sensors of radiophotonic fewsensor system

Abstract

Microwave photonic sensor systems represent a wide class of information systems with measurement conversion that use standardized analog and parallel links of parallel and sequential type with filtering, allowing to functionally displaying the information of the measurement conversion, obtained in the optical range, in the radio frequency one. One of the main, most widely used elements in the microwave photonic sensor systems, which solves the problems of forming, filtering and measuring the conversion of optical radiation, including for the stage of further generation of radio-frequency carriers, is the fiber Bragg grating. The cumulative analysis made it possible to propose for the design of microwave photonic sensor systems a new class of sensors - address fiber Bragg structures - constructed on the basis of the fiber Bragg grating with two symmetrical discrete phase shifts or two identical the fiber Bragg grating, potentially having improved metrological and technical and economic characteristics. Of particular interest are few-sensor measurement systems designed to simultaneously measure two related physical quantities simultaneously. In this paper, we will consider a mathematical model of a combined complex fiber-optic temperature and pressure sensor, as an example of constructing few-sensor microwave photonic measuring systems, which, without loss of generality, can be extended to temperature-deformation, temperature-strain pairs, etc. Discussed and resolved the problems of measurement situations, the emergence of which is determined by the essence of the address approach, and are aimed at unambiguous determination of the characteristics of the fiber Bragg grating with unic address.

Keywords

• microwave photonic sensor system
• address fiber bragg structure
• integrated fiber-optical sensor
• interrogation
• multiplexing
• address
• difference address frequency