The Optimization of Multimode Fiber Speckle Sensor for Microvibration

Figure 4

GLCM vibration sensing curves of fibers with different core diameters (red: contrast, blue: homogeneity): (a) 105 μm polymer optical fiber, (b) 250 μm polymer optical fiber, (c) FFT-contrast sensing curve of 105 μm polymer optical fiber, (d) FFT-contrast sensing curve of 250 μm polymer optical fiber, (e) FFT-homogeneity sensing curve of 105 μm polymer optical fiber, and (f) FFT-homogeneity sensing curve of 250 μm polymer optical fiber.

(a)

(b)

(c)

(d)

(e)

(f)