Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Schematic illustration of FBG pitch expansion due to hydrogel swelling corresponding to ambient pH changes. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. (a) Schematic of the experimental setup and (b) experimental setup. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Response of hydrogel-coated FBG sensor as a function of pH in time scale. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. FBG peak shift corresponding to different ambient pH buffers. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Repetitive response of the sensor system. Inset shows the standard deviation for three trials. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Comparison between stimulated and experimental results. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Stress–strain curve for PVA/PAA hydrogel layer. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Sensor response while increasing and decreasing the ambient pH. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Hysteresis curve due to gradual increase and decrease of ambient pH. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Oscillating behavior of the sensor between pH 2 and pH 6. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE
Date of download: 9/18/2016 Copyright © 2016 SPIE. All rights reserved. Swelling and deswelling times of hydrogel. Figure Legend: From: Hydrogel-coated fiber Bragg grating sensor for pH monitoring Opt. Eng. 2016;55(6): doi: /1.OE