“Principle of fiber optic crack sensor: The principle of the crack sensor is shown in the figure. When the optical fiber is pasted to the surface of the concrete structure or buried inside the concrete structure, the optical fiber forms a certain angle with the crack (because the direction of the cracks that may occur in the concrete structure can be predicted). Light is injected from one end of the optical fiber, and the optical time domain reflectometer (OTDR) is used to detect the loss and position of various points inside the optical fiber.
“
Today, the editor of Antai Electronics will take you to understand the application of power amplifier in the analysis of the relationship between the crack width and the optical fiber loss in the optical fiber crack sensor. The specific experimental process is as follows:
Experiment name：The application of power amplifier in the analysis of the relationship between the crack width and the optical fiber loss in the optical fiber crack sensor
experiment apparatus: Fiber optic sensor, computer, converter, optical probe, position sensor, ATA-101 power amplifier.
Experimental content: Distributed optical fiber sensor is a unique sensor that traditional electrical sensors do not have. It can measure the physical field along the path of optical fiber laying. In recent years, a large number of studies have begun to use distributed optical fiber sensors to detect large buildings , Dams, bridges, etc., to monitor the health of the structure. This paper proposes a distributed optical fiber crack salt transmitter for detecting concrete structures, as long as the crack direction is known, the sensor can measure the position and width of multiple cracks at the same time.
experiment procedure:
Principle of fiber optic crack sensor: The principle of the crack sensor is shown in the figure. When the optical fiber is pasted to the surface of the concrete structure or buried inside the concrete structure, the optical fiber forms a certain angle with the crack (because the direction of the cracks that may occur in the concrete structure can be predicted). Light is injected from one end of the optical fiber, and the optical time domain reflectometer (OTDR) is used to detect the loss and position of various points inside the optical fiber.
Crack sensor principle
The block diagram of the experimental system used to test the crack width and optical power loss is shown in the figure:
Experimental system diagram for testing
Experimental results:
The influence of the angle between the optical fiber and the crack on the performance of the sensor;
The effect of changing the NA of the optical fiber on the performance of the sensor.
The experimental materials of this article are organized and released by Xi’an Antai Electronics. If you want to know more experimental programs, please continue to pay attention to the official website of Antai www.aigtek.com. Aigtek is a domestic high-tech enterprise specializing in R&D, production and sales of measuring instruments. It has been focusing on the R&D and manufacturing of power amplifiers, wiring harness testers, measurement calibration sources and other test instrument products.
The Links: NL6448BC3370F EL512256-H2-FRB LCDDISPLAY
