Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2013 Jan 15;4(2):230–240. doi: 10.1364/BOE.4.00230

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

©2013 Optical Society of America

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially.

PMC Copyright notice

Fig. 3 — (A) A B-scan image of the 2 piezo-electric membrane setup. Piezo 1 labels the transparent plastic that was attached to one piezo-electric membrane. Piezo 2 labels the tape atop the second piezo-electric membrane. The A-line that was recorded from is highlighted by the yellow line. The depths that were compared are indicated by white arrows and labeled P1a, P1b, P2a, and P2b. The scale bar is 200 µm. (B) The measured phase difference at two different depths plotted against the input phase difference to the two piezo-electric membranes at 4 or 10 kHz. 4 kHz; P1a vs P2a refers to a comparison between the labeled depths. The equation of the linear fit was y = 1.0015(x) – 0.0002 and the R² value was 0.99. 10 kHz; P1a vs P2a refers to a comparison between the labeled depths. The equation of the linear fit was y = 0.996(x) – 0.0243 and the R² value was 0.99. 4 kHz; P1a vs P1b refers to a comparison between the labeled depths. The equation of the linear fit was y = 0.0048(x) – 0.0425 and the R² value was 0.18. 4 kHz; P2a vs P2b refers to a comparison between the labeled depths. The equation of the linear fit was y = −0.0005(x) + 0.0084 and the R² value was 0.0013.