A Method for Automatic Correction of Initial Wavelength of Optical Fiber Sensor

Abstract

The invention discloses a method for automatically correcting the initial wavelength of an optical fiber sensor. The overall steps are: select a monitoring bridge; install a corresponding optical fiber sensor; collect bridge structure signals through the optical fiber sensor, and then collect the optical fiber sensor to the Convert the signal into real-time wavelength data; draw the wavelength data curve; divide the period of external vehicle load and no load; select the period of no load within 10 to 30 minutes as the initial wavelength calculation period; select the initial wavelength calculation period The wavelength data of the last 1 to 5 minutes within the last 1 to 5 minutes is averaged, and the averaged value is taken as the new initial wavelength of the sensor. The invention solves the problem that the wavelength of the optical fiber sensor drifts with time, makes the monitoring data of the sensor reflect the bridge structure more realistically, facilitates bridge maintenance and management personnel to more timely and scientifically analyze the problems existing in the structure, and escorts the safe operation of the bridge.

Description

technical field [0001] The invention relates to a correction method, in particular to an automatic correction method of an initial wavelength of an optical fiber sensor, and belongs to the technical field of bridge health monitoring. Background technique [0002] At present, fiber optic sensors are widely used in the field of bridge structural health monitoring. Fiber optic sensors will become the mainstream direction of sensor development in the field of structural health monitoring in the future due to their superior anti-interference performance, high sensitivity, good stability, and long service life. However, due to the fact that the actual initial wavelength of the fiber optic sensor will change during the transportation and installation process, if the initial wavelength provided by the manufacturer is used for calculation at the beginning of data collection and calculation, it will cause a large deviation in the calculation result, making The monitoring data is abnor...

AI Technical Summary

Problems solved by technology

However, due to the fact that the actual initial wavelength of the fiber optic sensor will change during the transportation and installation process, if the initial wavelength provided by the manufacturer is used for calculation at the beginning of data collection and calculation, it will cause a large deviation in the calculation result, making The monitoring data is abnormal, and the problems existing in the bridge structure cannot be found in time, and the accurate data support for the safety evaluation of the bridge cannot be provided.

[0003] At present, the initial wavelength correction methods of fiber optic sensors are all manually calculated and corrected based on the collected data one by one. However, due to the large number of fiber optic sensors routinely used in the monitoring system, each correction will consume a lot of time and effort. In addition, the data collected by the system during this period are all abnormal data, which will lead to the inability to accurately and effectively capture the health and safety information of the bridge structure, resulting in greater safety hazards

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