Technical Note: Design of a handheld dipole antenna for a compact thermoacoustic imaging system

2018 ◽  
Vol 46 (2) ◽  
pp. 851-856 ◽  
Author(s):  
Lin Huang ◽  
Shaoli Ge ◽  
Zhu Zheng ◽  
Huabei Jiang
Keyword(s):  
Imaging System ◽  
Dipole Antenna ◽  
Technical Note ◽  
Thermoacoustic Imaging

Shape-adapting thermoacoustic imaging system based on flexible multi-element transducer

2015 ◽  
Vol 107 (9) ◽  
pp. 094104 ◽  
Author(s):  
Zhong Ji ◽  
Wenzheng Ding ◽  
Fanghao Ye ◽  
Cunguang Lou ◽  
Da Xing
Keyword(s):  
Imaging System ◽  
Thermoacoustic Imaging

scholarly journals High-Sensitivity RF Choke-Enhanced Dipole Antenna-Coupled Nb5N6 THz Detector

2021 ◽  
Vol 9 ◽  
Author(s):  
Chengtao Jiang ◽  
Xuecou Tu ◽  
Chao Wan ◽  
Lin Kang ◽  
Xiaoqing Jia ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Imaging System ◽  
High Sensitivity ◽  
Dipole Antenna ◽  
Thz Imaging ◽  
Antenna Structure ◽  
Imaging Results ◽  
Thz Detector

In this study, we demonstrate an Nb5N6 terahertz (THz) detector with radio frequency (RF) choke-enhanced dipole antenna structure for 0.3 THz detection. The maximum electric field intensity of 218 V/m is obtained by optimizing the parameters of the dipole antenna with RF choke. Compared to a dipole antenna without RF choke, the electric field intensity of that with RF choke is improved by 2.6 times. The RF choke-enhanced dipole antenna-coupled Nb5N6 THz detector is fabricated and characterized. The measured maximum responsivity of the detector is 1100 V/W at 0.308 THz, and the corresponding noise equivalent power (NEP) is 6.4 × 10–12 W/Hz1/2. The measured response time of the Nb5N6 THz detector is as low as 8.46 μs. Furthermore, the Nb5N6 THz detector is applied to a homemade THz transmission imaging system for demonstrating its performance. The THz imaging results of a blade and access card show that the contrast of the blade image is sharp and the components hidden within the access card are clearly visible. This indicates that the Nb5N6 THz detector can be used in THz imaging, particularly in THz active imaging, which will have greater application prospects.

scholarly journals A Microwave-Induced Thermoacoustic Imaging System With Non-Contact Ultrasound Detection

2019 ◽  
Vol 66 (10) ◽  
pp. 1587-1599 ◽  
Author(s):  
Ajay Singhvi ◽  
Kevin C. Boyle ◽  
Mojtaba Fallahpour ◽  
Butrus T. Khuri-Yakub ◽  
Amin Arbabian
Keyword(s):  
Imaging System ◽  
Thermoacoustic Imaging

scholarly journals Technical Note: Time-dependent limb-darkening calibration for solar occultation instruments

2010 ◽  
Vol 10 (1) ◽  
pp. 1-8 ◽  
Author(s):  
S. P. Burton ◽  
L. W. Thomason ◽  
J. M. Zawodny
Keyword(s):  
Imaging System ◽  
Stratospheric Aerosol ◽  
Technical Note ◽  
Atmospheric Composition ◽  
Reliable Technique ◽  
Scientific Exploration ◽  
Solar Occultation ◽  
The Face ◽  
Occultation Data ◽  
Limb Darkening

Abstract. Solar occultation has proven to be a reliable technique for the measurement of atmospheric constituents in the stratosphere. NASA's Stratospheric Aerosol and Gas Experiments (SAGE, SAGE II, and SAGE III) together have provided over 25 years of quality solar occultation data, a data record which has been an important resource for the scientific exploration of atmospheric composition and climate change. Herein, we describe an improvement to the processing of SAGE data that corrects for a previously uncorrected short-term time-dependence in the calibration function. The variability relates to the apparent rotation of the scanning track with respect to the face of the sun due to the motion of the satellite. Correcting for this effect results in a decrease in the measurement noise in the Level 1 line-of-sight optical depth measurements of approximately 40% in the middle and upper stratospheric SAGE II and III observations where it has been applied. The technique is potentially useful for any scanning solar occultation instrument and suggests further improvement for future occultation measurements if a full disk imaging system can be included.

scholarly journals Technical note: Nikon–TRACK<i>Flow</i>, a new versatile microscope system for fission track analysis

Geochronology ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 93-99
Author(s):  
Gerben Van Ranst ◽  
Philippe Baert ◽  
Ana Clara Fernandes ◽  
Johan De Grave
Keyword(s):  
Fission Track ◽  
Imaging System ◽  
Technical Note ◽  
Point Selection ◽  
Plate Design ◽  
Icp Ms ◽  
User Friendly ◽  
Doped Glass ◽  
High Throughput Imaging ◽  
Multiple Samples

Abstract. We present Nikon–TRACKFlow, a new system with dedicated modules for automated microscope control and imaging for the fission track laboratory. It serves as a Nikon alternative for the Zeiss-based TrackWorks package from Autoscan Systems. Nikon–TRACKFlow is based on the Nikon Eclipse Ni-E motorised upright microscope and is embedded within Nikon NIS-Elements software. The system decouples image acquisition from analysis to decrease schedule stress of the microscope based on a number of automated user-friendly designs and protocols: (1) the well plate design that allows sequential scanning of multiple samples without the need of replacing the slide on the stage; (2) two protocols that are designed for the external detector method and the LA–ICP–MS fission track approach with tools for repositioning and calibration of the external detector; and (3) two other tools that are designed for automated point selection and scanning of large crystals, such as the Durango age standard and U-doped glass external detectors. In future versions, Nikon–TRACKFlow aims to step away from the dedicated system for fission track imaging towards a general high-throughput imaging system for Earth Sciences and other material-oriented sciences.

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