scholarly journals Holographic pixel super-resolution in portable lensless on-chip microscopy using a fiber-optic array

Lab on a Chip ◽  
2011 ◽  
Vol 11 (7) ◽  
pp. 1276 ◽  
Author(s):  
Waheb Bishara ◽  
Uzair Sikora ◽  
Onur Mudanyali ◽  
Ting-Wei Su ◽  
Oguzhan Yaglidere ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Super Resolution ◽  
On Chip ◽  
Optic Array

Seismic Observations of Four Thunderstorms Using an Underground Fiber-Optic Array

2021 ◽  
Author(s):  
Samuel Hone ◽  
Tieyuan Zhu
Keyword(s):  
Fiber Optic ◽  
Seismic Velocity ◽  
Ground Surface ◽  
State College ◽  
Full Waveform ◽  
Penn State ◽  
Distributed Acoustic Sensing ◽  
Back Azimuth ◽  
Optic Array ◽  
The Waves

Abstract Thunderstorms are a common atmospheric phenomenon that cause abundant acoustic disturbances, which can interact with the ground surface, creating a link between atmospheric and solid Earth processes. This article reports seismological observations of four thunderstorms through the spring and summer of 2019, as recorded by the distributed acoustic sensing fiber-optic array (4.9 km) on the Penn State campus in State College, Pennsylvania. With a dense sensor array in the local region, we are able to construct the seismic full waveform response of the thunderstorm events (hereafter referred to as thunderquakes) and track the wave propagation across the array. We use a time-domain grid search to obtain the back azimuth and slowness of the waves, and a modified Geiger’s method to pinpoint source locations of the thunderquakes. Correlated with the time of the recorded signal, this data allows reconstruction of thunderstorm movement as well as offering measurements of the seismic velocity.

Wavelength scanning achieves pixel super-resolution in holographic on-chip microscopy

2016 ◽  
Author(s):  
Wei Luo ◽  
Zoltan Göröcs ◽  
Yibo Zhang ◽  
Alborz Feizi ◽  
Alon Greenbaum ◽  
...  
Keyword(s):  
Super Resolution ◽  
Wavelength Scanning ◽  
On Chip

Fiber-Optic Array Biosensors

2008 ◽  
Author(s):  
Rahela Ga��parac ◽  
David R. Walt
Keyword(s):  
Fiber Optic ◽  
Optic Array

Nanosecond Pulsed Electric Field Lab‐on‐Chip Integrated in Super‐Resolution Microscope for Cytoskeleton Imaging

2019 ◽  
Vol 5 (3) ◽  
pp. 1900669 ◽  
Author(s):  
Daniel Havelka ◽  
Djamel Eddine Chafai ◽  
Ondrej Krivosudský ◽  
Anastasiya Klebanovych ◽  
František Vostárek ◽  
...  
Keyword(s):  
Electric Field ◽  
Super Resolution ◽  
Pulsed Electric Field ◽  
Lab On Chip ◽  
Nanosecond Pulsed Electric Field ◽  
On Chip

A liquid level sensor based on fiber optic array and magnetic coupling

2012 ◽  
Author(s):  
Wei He ◽  
Xuan Yu ◽  
Chenggang Wang ◽  
Cui Zhang ◽  
Bo Feng ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Magnetic Coupling ◽  
Liquid Level ◽  
Level Sensor ◽  
Optic Array ◽  
Liquid Level Sensor

scholarly journals Autofocusing Algorithm for Pixel-Super-Resolved Lensfree On-Chip Microscopy

2021 ◽  
Vol 9 ◽  
Author(s):  
Yumin Wu ◽  
Linpeng Lu ◽  
Jialin Zhang ◽  
Zhuoshi Li ◽  
Chao Zuo
Keyword(s):  
Focal Plane ◽  
Super Resolution ◽  
Propagation Distance ◽  
Low Noise ◽  
Wide Field ◽  
Low Resolution ◽  
Image Sharpness ◽  
Critical Function ◽  
Microscopy Technique ◽  
On Chip

In recent years, lensfree on-chip microscopy has developed into a promising and powerful computational optical microscopy technique that allows for wide-field, high-throughput microscopic imaging without using any lenses. However, due to the limited pixel size of the state-of-the-art image sensors, lens-free on-chip microscopy generally suffers from low imaging resolution, which is far from enough to meet the current demand for high-resolution microscopy. Many pixel super-resolution techniques have been developed to solve or at least partially solve this problem by acquiring a series of low-resolution holograms with multiple lateral sub-pixel shifting or axial distances. However, the prerequisite of these pixel super-resolution techniques is that the propagation distance of each low-resolution hologram can be obtained precisely, which faces two major challenges. On the one hand, the captured hologram is inherent pixelated and of low resolution, making it difficult to determine the focal plane by evaluating the image sharpness accurately. On the other hand, the twin-image is superimposed on the backpropagated raw hologram, further exacerbating the difficulties in accurate focal plane determination. In this study, we proposed a high-precision autofocusing algorithm for multi-height pixel-super-resolved lensfree on-chip microscopy. Our approach consists of two major steps: individual preliminary estimation and global precise estimation. First, an improved critical function that combines differential critical function and frequency domain critical function is proposed to obtain the preliminary focus distances of different holograms. Then, the precise focus distances can be determined by further evaluating the global offset of the averaged, low-noise reconstruction from all backpropagated holograms with preliminary focus distances. Simulations and experimental results verified the validity and effectiveness of the proposed algorithm.

Multi-angle illumination with pixel super-resolution enables lensfree on-chip tomography

SPIE Newsroom ◽  
2011 ◽  
Author(s):  
Serhan Isikman ◽  
Waheb Bishara ◽  
Uzair Sikora ◽  
Oguzhan Yaglidere ◽  
Aydogan Ozcan
Keyword(s):  
Super Resolution ◽  
On Chip

scholarly journals Fiber Optic Array Biosensors

BioTechniques ◽  
2006 ◽  
Vol 41 (5) ◽  
pp. 529-535 ◽  
Author(s):  
David R. Walt
Keyword(s):  
Fiber Optic ◽  
Optic Array
Sign in / Sign up

Export Citation Format

Share Document