scholarly journals A Compact Raster Lensless Microscope Based on a Microdisplay

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5941
Author(s):  
Anna Vilà ◽  
Sergio Moreno ◽  
Joan Canals ◽  
Angel Diéguez
Keyword(s):  
Optical Microscopy ◽  
Light Source ◽  
Display Size ◽  
Image Sensor ◽  
Field Of View ◽  
Pixel Detector ◽  
Measuring Time ◽  
Maximum Resolution ◽  
Single Pixel

Lensless microscopy requires the simplest possible configuration, as it uses only a light source, the sample and an image sensor. The smallest practical microscope is demonstrated here. In contrast to standard lensless microscopy, the object is located near the lighting source. Raster optical microscopy is applied by using a single-pixel detector and a microdisplay. Maximum resolution relies on reduced LED size and the position of the sample respect the microdisplay. Contrarily to other sort of digital lensless holographic microscopes, light backpropagation is not required to reconstruct the images of the sample. In a mm-high microscope, resolutions down to 800 nm have been demonstrated even when measuring with detectors as large as 138 μm × 138 μm, with field of view given by the display size. Dedicated technology would shorten measuring time.

Large Field-of-View Super-Resolution Optical Microscopy Based on Planar Polymer Waveguides

ACS Photonics ◽  
2021 ◽  
Author(s):  
Anders Kokkvoll Engdahl ◽  
Stefan Belle ◽  
Tung-Cheng Wang ◽  
Ralf Hellmann ◽  
Thomas Huser ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Super Resolution ◽  
Field Of View ◽  
Large Field ◽  
Polymer Waveguides

Research on Physical MPPT of Photovoltaic Array System Based on Image Processing

2013 ◽  
Vol 321-324 ◽  
pp. 1138-1144
Author(s):  
Chao Liu ◽  
Jing Hui
Keyword(s):  
Image Processing ◽  
Tracking Error ◽  
Elevation Angle ◽  
Image Sensor ◽  
Azimuth Angle ◽  
Field Of View ◽  
The Sun ◽  
Photovoltaic Array ◽  
Point Tracking ◽  
Power Point

Based on analyzing the development and the performance feature of existing solar tracker, we propose a solar Maximum Power Point Tracking (MPPT) strategy which combines photoelectric sensor and image processing. Firstly, photoelectric tracking mode positions the sun in the field of view of the image sensor. Then, the position of the sun image is captured by the image sensor. After that, we can find the coordinates of the sun spot in the field of view through image binarization processing. According to the number of steps of stepper motor rotation which is calculated by the deviation of coordinates, the controller drives the biaxial photosensitive (PV) array tracking device, making the sun spot always fall in the centre of the image. Tests show that the elevation angle and azimuth angle of the tracking range of the photovoltaic array are both 0～270°.The average tracking error of elevation angle is less than 0.7°, and the average tracking error of azimuth angle is less than 0.5°.

scholarly journals Beamline K11 DIAD: a new instrument for dual imaging and diffraction at Diamond Light Source

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Christina Reinhard ◽  
Michael Drakopoulos ◽  
Sharif I. Ahmed ◽  
Hans Deyhle ◽  
Andrew James ◽  
...  
Keyword(s):  
Light Source ◽  
Field Of View ◽  
Phase Identification ◽  
Specific Information ◽  
Beam Design ◽  
Dual Beam ◽  
New Instrument ◽  
In Operando ◽  
Dual Imaging

The Dual Imaging and Diffraction (DIAD) beamline at Diamond Light Source is a new dual-beam instrument for full-field imaging/tomography and powder diffraction. This instrument provides the user community with the capability to dynamically image 2D and 3D complex structures and perform phase identification and/or strain mapping using micro-diffraction. The aim is to enable in situ and in operando experiments that require spatially correlated results from both techniques, by providing measurements from the same specimen location quasi-simultaneously. Using an unusual optical layout, DIAD has two independent beams originating from one source that operate in the medium energy range (7–38 keV) and are combined at one sample position. Here, either radiography or tomography can be performed using monochromatic or pink beam, with a 1.4 mm × 1.2 mm field of view and a feature resolution of 1.2 µm. Micro-diffraction is possible with a variable beam size between 13 µm × 4 µm and 50 µm × 50 µm. One key functionality of the beamline is image-guided diffraction, a setup in which the micro-diffraction beam can be scanned over the complete area of the imaging field-of-view. This moving beam setup enables the collection of location-specific information about the phase composition and/or strains at any given position within the image/tomography field of view. The dual beam design allows fast switching between imaging and diffraction mode without the need of complicated and time-consuming mode switches. Real-time selection of areas of interest for diffraction measurements as well as the simultaneous collection of both imaging and diffraction data of (irreversible) in situ and in operando experiments are possible.

scholarly journals X-ray computational ghost imaging with single-pixel detector

2019 ◽  
Vol 27 (3) ◽  
pp. 3284 ◽  
Author(s):  
Y. Klein ◽  
A. Schori ◽  
I. P. Dolbnya ◽  
K. Sawhney ◽  
S. Shwartz
Keyword(s):  
Pixel Detector ◽  
Ghost Imaging ◽  
X Ray ◽  
Single Pixel

Scanning Optical Microscopy with an Electrogenerated Chemiluminescent Light Source at a Nanometer Tip

2001 ◽  
Vol 73 (10) ◽  
pp. 2153-2156 ◽  
Author(s):  
Yanbing Zu ◽  
Zhifeng Ding ◽  
Junfeng Zhou ◽  
Youngmi Lee ◽  
Allen J. Bard
Keyword(s):  
Optical Microscopy ◽  
Light Source ◽  
Scanning Optical Microscopy

Picosecond time-resolved imaging using a single-pixel detector

2020 ◽  
Author(s):  
Xiaobo Tan ◽  
Can Li ◽  
Yongzhuang Zhou ◽  
Shaorong Chen ◽  
Zhaowen Zhuang
Keyword(s):  
Pixel Detector ◽  
Time Resolved ◽  
Time Resolved Imaging ◽  
Single Pixel

Design of Tunable Light Source for Calibration of CMOS Image Sensor

2017 ◽  
Vol 37 (3) ◽  
pp. 0323001
Author(s):  
蔡锦达 Cai Jinda ◽  
刘倩 Liu Qian ◽  
邹亿 Zou Yi ◽  
甘康 Gan Kang
Keyword(s):  
Light Source ◽  
Cmos Image Sensor ◽  
Image Sensor

scholarly journals GREENBURST: A commensal Fast Radio Burst search back-end for the Green Bank Telescope

2019 ◽  
Vol 36 ◽  
Author(s):  
Mayuresh P. Surnis ◽  
D. Agarwal ◽  
D. R. Lorimer ◽  
X. Pei ◽  
G. Foster ◽  
...  
Keyword(s):  
Radio Burst ◽  
High Sensitivity ◽  
Pixel Detector ◽  
Search System ◽  
Dispersion Measures ◽  
Fast Radio Burst ◽  
Radio Transients ◽  
Green Bank Telescope ◽  
Single Pixel ◽  
Rotating Radio Transients

Abstract We describe the design and deployment of GREENBURST, a commensal Fast Radio Burst (FRB) search system at the Green Bank Telescope. GREENBURST uses the dedicated L-band receiver tap to search over the 960–1 920 MHz frequency range for pulses with dispersion measures out to $10^4\ \rm{pc\,cm}^{-3}$ . Due to its unique design, GREENBURST is capable of conducting searches for FRBs when the L-band receiver is not being used for scheduled observing. This makes it a sensitive single pixel detector capable of reaching deeper in the radio sky. While single pulses from Galactic pulsars and rotating radio transients will be detectable in our observations, and will form part of the database we archive, the primary goal is to detect and study FRBs. Based on recent determinations of the all-sky rate, we predict that the system will detect approximately one FRB for every 2–3 months of continuous operation. The high sensitivity of GREENBURST means that it will also be able to probe the slope of the FRB fluence distribution, which is currently uncertain in this observing band.

Spectral-Type Probe with λ/40 Resolution for Near-Field Optical Microscopy Systems

2013 ◽  
Vol 677 ◽  
pp. 373-378
Author(s):  
Yuri N. Kulchin ◽  
Oleg B. Vitrik ◽  
Aleksandr A. Kuchmizhak
Keyword(s):  
Optical Microscopy ◽  
Light Source ◽  
Spatial Resolution ◽  
Spectral Type ◽  
Near Field ◽  
Fabrication Process ◽  
Fabry Perot ◽  
Evanescent Light

We studied numerically and experimentally the ability to develop a new probe based on fiber Fabry-Perot interferometer with an evanescent light source protruding directly toward the sample. It was shown that such probe provides a spatial resolution of no worse than ~λ/40 for λ=1550 nm. The fabrication process of the probe is described in detail.

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