1 Subjects: “...optical sensors...”

2 Subjects: “...fiber optic sensors embedded in concrete...”

3 Subjects: “...chemical sensors...”

4 Subjects: “...chemical sensors...”

5 Subjects: “...optical sensors...”

6 Subjects: “...optical sensors...”

7 Subjects: “...optical sensors...”

8 Subjects: “...optical sensors...”

9 Subjects: “...fiber optic sensor...”

10 Subjects: “...proximal optical sensors...”

11 Subjects: “...reflective optical sensor...”

12 Subjects: “...chemical sensor...”

13 Subjects: “...chemical sensor...”