Hari Nandakumar

In-vivo sensing of the vibrations and thickness of the human tympanum with real-time profilometry using low-cost line-field spectral domain optical coherence tomography

Denny Melkay M George, Hari Nandakumar, V Koushik, Sai Prashanth Josyula et autres

in (code pays fourni par la source)

A Novel Method for In-Vivo Measurement of the Nanometer-Scale Vibrations and Visualization of the Thickness of the Human Tympanum Using Low-Cost Spectral Domain Optical Coherence Tomography

Denny Melkay M George, Hari Nandakumar, V Koushik, Sai Prashanth Josyula et autres

in (code pays fourni par la source)

Nanorobotics for advancing biomedicine: Advances in Materials, design, fabrication, opportunities and health risks

Amogh Pn, Hari Nandakumar, Shrish Shrinath Vaidya, Sri Krishna et autres

Advances in medical robots promise to improve modern medicine and the quality of life. Nanorobotics is the field of inventing machines or robots at or close to microscopic scale of a nanometer (m). Miniaturization of these robotic platforms has led to numerous …

us (code pays fourni par la source)

Enhancement of dynamic range and complete elimination of self-interference artifacts in a spectral domain OCT: Potential for high performance at much lowered-cost

Denny Melkay M George, Hari Nandakumar, Shailesh Srivastava

In this paper, we introduce a novel time-averaged sampling method that can be used in a low-cost, camera-based, line-field, spectral domain optical coherence tomography (SD-OCT) device. We demonstrate that when used with an automated subtraction and magnitude based averaging scheme that is …

in (code pays fourni par la source)

Low Cost Open-Source OCT Using Undergraduate Lab Components

Hari Nandakumar, Shailesh Srivastava

Instrument cost is one of the factors limiting the adoption of optical coherence tomography (OCT) from a wider range of applications. We present a couple of OCT devices using optical components which are commonly found in undergraduate-level optics laboratories. These low-cost devices …

in (code pays fourni par la source)

ABC-OCT – A Cross-Platform Implementation of Real-Time Fourier-Domain Optical Coherence Tomography

Hari Nandakumar, Shailesh Srivastava

ABC-OCT, Affordable B-scan Camera-based Optical Coherence Tomography, implements Fourier-Domain Optical Coherence Tomography with real-time display using cross-platform C++ and the OpenCV framework. The software can be compiled using current versions of GCC for *nix/Mac and Microsoft®Visual Studio for Windows. Full functionality of …

in (code pays fourni par la source)

Complete Removal of Arbitrarily Strong and Arbitrarily Located Auto Correlation Artifacts in Spectral Domain Optical Coherence Tomography: Demonstration of an Efficient and Cost Effective Technique

Hari Nandakumar, SatyaPrasanna Mallick, Shailesh Srivastava

The proof-of-principle demonstration of a simple, yet effective method of autocorrelation artifact removal for optical coherence tomography (OCT) is presented using a custom-designed parallel spectral-domain OCT (SD-OCT) instrument. Our real-time method is based on time-averaged sampling of a sinusoidal phase modulation in …

in (code pays fourni par la source)

ABC-OCT - A Cross-Platform Implementation of Real-Time Fourier-Domain Optical Coherence Tomography

Hari Nandakumar, Shailesh Srivastava

ABC-OCT, Affordable B-scan Camera-based Optical Coherence Tomography, implements Fourier-Domain Optical Coherence Tomography with real-time display using cross-platform C++ and the OpenCV framework. The software can be compiled using current versions of GCC for *nix/Mac and Microsoft® Visual Studio for Windows. Full functionality …

in (code pays fourni par la source)

Sensing high frequency sub-nanometer vibrations using optical coherence tomography with real-time profilometry of multiple inner layers

Hari Nandakumar, Satya Prasanna Mallick, Shailesh Srivastava

in (code pays fourni par la source)

Artifact-free robust single-shot background subtraction for optical coherence tomography

Hari Nandakumar, Swaroop Parameshwaran, Rohith Gamini, Shailesh Srivastava

A proof-of-principle demonstration of a novel method of background subtraction for optical coherence tomography is presented using a full-field time-domain set-up. This single-shot method is based on time-averaged sampling of a sinusoidal phase modulation in the reference arm. It can significantly suppress …

in (code pays fourni par la source)

Data and Code for Analyzing Performance of QHY CMOS Cameras

Hari Nandakumar, Shailesh Srivastava

Expensive cameras meant for research applications are usually characterized by the manufacturers and detailed specifications [1] are available for them. Suppliers of inexpensive cameras usually do not provide such detailed information about their cameras. This data set provides the acquisition speed and …

in (code pays fourni par la source)

Sub-4-micron full-field optical coherence tomography on a budget

Hari Nandakumar, ADITHYA KOKKODU SUBRAMANIA, Shailesh Srivastava

in (code pays fourni par la source)