Fiber-Optic Temperature Sensor for Monitoring the Stress-Strain State of Building Structures

Measuring the temperature of building structures is an urgent scientific and technical task necessary for assessing the quality of concrete mixtures, soil research, and determining the thermal resistance of structures. The accuracy of measuring the temperature of the cement base of structures such as pipelines, bridges, nuclear power plants and other large engineering facilities depends on the safety and durability of their operation. Temperature measuring instruments at important strategic facilities should timely detect overheating of structural elements, monitor over long distances, have accuracy, safety, and should not create additional electromagnetic interference. Therefore, it is important to make a choice in favor of fiber-optic measuring transducers. A fiber-optic temperature sensor has been developed designed to measure the temperature in the material of a building structure during long-term monitoring of the stress-strain state of buildings and structures. The effect of temperature on a measuring instrument with an open optical channel changes the intensity of the luminous flux in the micro-optical-mechanical system of the sensor, which leads to a change in the characteristics of the back reflection signal. The information and measurement system based on fiber-optic sensors is based on the conversion of parameters of a modulated stream coming from the measuring zone via an optical fiber to a radiation receiver and subject to further processing in the information conversion unit.