A Cascade Type Optical Algebraic Device Using Ultrasonic Diffraction Grating

Optical Simulation of Grating Diffraction in MATLAB

The “Grating Diffraction Calculator” (GD-Calc) is a MATLAB-based, electromagnetic simulation program that computes diffraction efficiencies of optical grating structures, including biperiodic gratings. The program’s capabilities include a general and flexible grating modeling facility, structure parameterization (with any number of parameters), and unrestricted control over diffraction order se...

Microfluidic droplet grating for reconfigurable optical diffraction.

This Letter presents a reconfigurable optical diffraction grating using multiphase droplets on a microfluidic chip. The uniform and evenly spaced circular droplets are generated by continuously dispersing two immiscible liquids into a T junction to produce plugs, which are then transformed into a circular shape at a sudden expansion of the microchannel. In experiments, the droplet grating shows...

Aplanatic grazing incidence diffraction grating: a new optical element.

A fiber-based ratiometric optical cardiac mapping channel using a diffraction grating and split detector.

Optical fiber-based mapping systems are used to record the cardiac action potential (AP) throughout the myocardium. The optical AP contains a contraction-induced motion artifact (MA), which makes it difficult to accurately measure the action potential duration (APD). MA is removed by preventing contraction with electrical-mechanical uncoupling drugs, such as 2,3-butanedione monoxime (BDM). We d...

A Novel Method for Ultrasonic Evaluation of Horizontal Defects Using Time-of-Flight Diffraction

Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. Although ToFD can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. In this paper, a new ToFD method for evaluating horizontal planar defects is presented. The finite...