Enlargement of Dynamic Strain Range in Chaotic Brillouin Optical Correlation Domain Analysis by Cross-Arranged Multislope Assistance

High-Spatial-Resolution Dynamic Strain Measurement Based on Brillouin Optical Correlation-Domain Sensors

“…In this paper, a brief overview of the developments of dynamic strain sensing with high spatial resolution is summarized for Brillouin optical correlation-domain technology, as shown in Table 2. The data of Table 2 were sourced from references [43][44][45][46][47][48][49][50][51][52][59][60][61][62][63][64][65][66][67][68][69][70][71].…”

“…However, several drawbacks, such as lower frequency and inferior accuracy, are expected to be solved by introducing a VCO or a wider-phase chaos laser. Recently, a cross-aligned multiple-slope-assisted (MSA) chaos-based BOCDA system was proposed to further extend the dynamic strain measurement range and the slope utilization rate (SUR) [66]. The cross-arranged MSA model diagram is shown in Figure 13a, where the black solid lines are the BGSs obtained by applying different pre-strain, the blue solid lines are the linear regions corresponding to the rising and falling edges of each BGS, and the solid red points are the central frequency of the linear region.…”

“…For 3, there is a trade-off problem between the high accuracy or wide range and fast measurement. In order to achieve high-speed and real-time measurement, especially of dynamic strain caused by vibration, fast Brillouin DOFSs based on fast-sweep [39][40][41][42][43][44][45][46][47][48][49][50][51][52], sweep-free [53][54][55], and slope-assisted [56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71] methods have been proposed.…”