TEMPERATURE COMPENSATION METHOD OF FIBER OPTIC SENSOR

摘要

PURPOSE: A method for compensating the temperature of an optical fiber sensor is provided to precisely perform the temperature compensation of an optical fiber sensor sensing a strain in consideration of an installation environment. CONSTITUTION: A method for compensating the temperature of an optical fiber sensor is as follows. Strain data is collected under a temperature controlling environment with respect to an optical fiber sensor and a dummy sensor for compensating temperature(S308). An entire strain is obtained according to properties of the collected strain data(S310). An environment condition coefficient is estimated with respect to a plurality of measurement results(S312). The temperature compensation of the optical fiber sensor is performed by using a temperature compensation condition according to the estimated environment condition coefficient(S316). [Reference numerals] (AA) Start; (BB) Finish; (S302) Drawing an entire strain rate of an optical fiber sensor with consideration for an installation environment; (S304) Drawing a strain rate depending on stress; (S306) Eliminating installation environment components by using an environment condition coefficient and a strain rate of a dummy sensor for compensating temperature; (S308) Collecting strain rate data by using measurement conditions capable of substituting strain caused by stress with '0'; (S310) Drawing an entire strain rate depending on properties of collected strain rate data; (S312) Estimating an environment condition coefficient with respect to measurement results by using least square technique; (S314) Drawing temperature compensating condition by using the sensitivity with respect to a frequency change and the strain of a dummy sensor for compensating temperature; (S316) Compensating the temperature of an optical fiber sensor