NiO thickness measurement using a rectangular-type Sagnac interferometer as the material transport layer in a perovskite solar cell.

This work aims to utilize a phase-shifting technique in a rectangular-type Sagnac interferometer (RTSI) to measure the thickness of a thin film of nickel (II) oxide (NiO) in an electron transport layer (ETL) in perovskite solar cell preparation. The NiO layer is deposited on a fluorine-doped tin oxide (FTO) glass substrate. In the RTSI setup, the signal output from the interferometer is divided into the reference and testing arms using a nonpolarizing beam splitter (NPBS).

Phase-shifting determination and pattern recognition using a modified Sagnac interferometer with multiple reflections.

This work has implemented a diverse modification of the Sagnac interferometer to accommodate various measurement requirements, including phase shifting, pattern recognition, and a morphological analysis. These modifications were introduced to validate the adaptability and versatility of the system. To enable phase shifting using the multiple light reflection technique, a half-wave plate (HWP) was utilized with rotations at 0, /8, /4, and 3/8 radians, generating four interference patterns.

A flow quantification method using fluid dynamics regularization and MR tagging.

This paper presents a new method for improved flow analysis and quantification using MRI. The method incorporates fluid dynamics to regularize the flow quantification from tagged MR images. Specifically, the flow quantification is formulated as a minimization problem based on the following: 1) the Navier-Stokes equation governing the fluid dynamics; 2) the flow continuity equation and boundary conditions; and 3) the data consistency constraint.

A regularized flow quantification method using MRI tagging and Single Echo Acquisition imaging.

Single Echo Acquisition (SEA) imaging is a fully parallel imaging method that can be used to image rapid flow at the frame rate as high as 200 frames per second. Previous work has shown that SEA imaging can visualize turbulent flows, and discussed a preliminary tool for quantitatively analyzing 2D rapid fluid flows using SEA imaging and the HARmonic Phase (HARP) method. In this paper, the quantification method was further developed to use physical model to constrain the HARP flow analysis.

A new serial image registration method for contrast-enhanced MRI study.

This paper presents a new method for aligning serial images acquired in contrast-enhanced MRI studies. A unique feature of the proposed method is that it uses dynamic references, rather than a single reference image as in the conventional method, to obtain co-registration of serial images. Specifically, each image serves as a reference for its neighboring images and the overall registration of all serial images is derived subsequently.