STRAIN MEASURING APPARATUS AND MONITORING SYSTEM FOR SAFETY GRADE OF SHIP COMPRISING THEREOF

According to an embodiment of the present invention, a strain measuring apparatus comprises: an optical source which generates an optical signal with a target wavelength band; multiple optical fiber brag grid sensors which reflect the optical signal in order to generate multiple reflected optical signals with different wavelengths from one another; a wave guide array grid which outputs the multiple reflected optical signals through different output channels; a circulator which transmits the optical signal from the optical source to the multiple optical fiber brag grid sensors, and transmits the multiple reflected optical signals to the wave guide array grid; multiple optical diodes which convert the multiple reflected optical signals into electric signals respectively; and a signal processing unit which calculates the corresponding reflected optical signal using the electric signal, and calculates strain applied to the multiple optical fiber brag grid sensors using the central wavelength.