A dynamic ionosonde design using pulse coding

1991 ◽  
Vol 69 (8-9) ◽  
pp. 1184-1189 ◽  
Author(s):  
S. Gao ◽  
J. W. MacDougall
Keyword(s):  
Solid State ◽  
Data Storage ◽  
Peak Power ◽  
Pulse Compression ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Solid State Electronics ◽  
Barker Code ◽  
Noise Ratio

A research ionosonde with capabilities for measuring drifts by the spaced-antenna method was designed and a limited prototype tested. Using a PC for much of the control and data storage functions and a small quantity of external electronics will make the instrument small and inexpensive. In particular, pulse compression techniques using a 13 bit Barker code gives an improvement in signal-to-noise ratio of about 11 dB. This allows the use of a transmitter with peak power less than a kilowatt, which is compatible with solid-state electronics.

The Noise Analysis of Fluid Systemsin Solid-State Nanopore Sensors

2013 ◽  
Vol 419 ◽  
pp. 517-520 ◽  
Author(s):  
Song Ying ◽  
Lei Wang ◽  
Wen Yuan Zhao
Keyword(s):  
Solid State ◽  
Signal To Noise Ratio ◽  
Noise Analysis ◽  
Power Spectra ◽  
Noise Power ◽  
Label Free ◽  
Signal To Noise ◽  
Fluid Systems ◽  
Noise Ratio ◽  
Nanopore Sensors

The solid-state nanopore sensor offers a versatile platform for the rapid, label-free electrical detection and analysis of single molecules, especially on DNA sequencing. However, the overall signal-to-noise ratio (SNA) is a major challenge in sequencing applications. In our work, two different fluid systems made by metal and plexiglass have been designed to improve the signal to noise ratio of the solid-state nanopore sensor. From the measurements on the noise power spectra with a variety of conditions, it is found that plexiglass fluid system coupled with shielding box produces a good quality of electric signals on nanopore sensors.

scholarly journals Comparing current noise in biological and solid-state nanopores

2019 ◽  
Author(s):  
A. Fragasso ◽  
S. Schmid ◽  
C. Dekker
Keyword(s):  
Solid State ◽  
Single Molecule ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Ionic Current ◽  
Low Noise ◽  
Signal To Noise ◽  
Experimental Conditions ◽  
High Frequencies ◽  
Noise Ratio

AbstractNanopores bear great potential as single-molecule tools for bioanalytical sensing and sequencing, due to their exceptional sensing capabilities, high-throughput, and low cost. The detection principle relies on detecting small differences in the ionic current as biomolecules traverse the nanopore. A major bottleneck for the further progress of this technology is the noise that is present in the ionic current recordings, because it limits the signal-to-noise ratio and thereby the effective time resolution of the experiment. Here, we review the main types of noise at low and high frequencies and discuss the underlying physics. Moreover, we compare biological and solid-state nanopores in terms of the signal-to-noise ratio (SNR), the important figure of merit, by measuring free translocations of a short ssDNA through a selected set of nanopores under typical experimental conditions. We find that SiNx solid-state nanopores provide the highest SNR, due to the large currents at which they can be operated and the relatively low noise at high frequencies. However, the real game-changer for many applications is a controlled slowdown of the translocation speed, which for MspA was shown to increase the SNR >160-fold. Finally, we discuss practical approaches for lowering the noise for optimal experimental performance and further development of the nanopore technology.

Improved Signal-to-Noise Ratio Using Phase Compensation in Shift- and Angle-Multiplexed Holographic Data Storage

2008 ◽  
Vol 47 (7) ◽  
pp. 5989-5992 ◽  
Author(s):  
Norihiko Ishii ◽  
Nobuhiro Kinoshita ◽  
Tetsuhiko Muroi ◽  
Koji Kamijo ◽  
Naoki Shimidzu
Keyword(s):  
Data Storage ◽  
Signal To Noise Ratio ◽  
Holographic Data Storage ◽  
Signal To Noise ◽  
Phase Compensation ◽  
Noise Ratio

scholarly journals Dual-polarized multiplexed meta-holograms utilizing coding metasurface

Nanophotonics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 3605-3613 ◽  
Author(s):  
Chunsheng Guan ◽  
Jian Liu ◽  
Xumin Ding ◽  
Zhuochao Wang ◽  
Kuang Zhang ◽  
...  
Keyword(s):  
Data Storage ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Split Ring ◽  
Practical Applications ◽  
Good Imaging ◽  
Linearly Polarized ◽  
Novel Method ◽  
Noise Ratio ◽  
Total Transmittance

AbstractIn this paper, a novel method is proposed to achieve two distinct information channels by simultaneously manipulating both the transmitted cross- and co-polarized components of a 1-bit coding metasurface under linearly polarized incidence. Compared to previously demonstrated incidence-switchable or position multiplexed holograms, our proposed coding meta-hologram can simultaneously project two independent holographic images without inevitable change of the incidence state and can at the same time also avoid crosstalk between different channels. Moreover, the orientation of the double-layered split ring (SR) apertures is specially designed to be 45° or 135° to achieve identical multiplexed functionality for both x-polarized and y-polarized incidences. The proof-of-concept experimental demonstrations present total transmittance efficiency above 30% for the dual linearly polarized incidences at 15 GHz, and good imaging performances with 53.98%/48.18% imaging efficiency, 1.55%/1.46% RMSE, and 29.9/28.72 peak signal-to-noise ratio for the cross-/co-polarized channels under y-polarized incidence, and 47.27%/45.75% imaging efficiency, 1.55%/1.43% RMSE, and 18.74/25.93 peak signal-to-noise ratio under x-polarized incidence, demonstrating great potential of the proposed multiplexed coding meta-hologram in practical applications such as data storage and information processing.

Improving signal-to-noise ratio by use of a cross-shaped aperture in the holographic data storage system

2009 ◽  
Vol 48 (32) ◽  
pp. 6234 ◽  
Author(s):  
Huarong Gu ◽  
Songfeng Yin ◽  
Qiaofeng Tan ◽  
Liangcai Cao ◽  
Qingsheng He ◽  
...  
Keyword(s):  
Data Storage ◽  
Signal To Noise Ratio ◽  
Storage System ◽  
Holographic Data Storage ◽  
Signal To Noise ◽  
Data Storage System ◽  
Noise Ratio

scholarly journals A mobile seismograph array

1966 ◽  
Vol 56 (4) ◽  
pp. 889-897 ◽  
Author(s):  
Francis E. Lehner ◽  
Frank Press
Keyword(s):  
Solid State ◽  
Frequency Band ◽  
Magnetic Tape ◽  
Signal To Noise Ratio ◽  
Tape Recording ◽  
Signal To Noise ◽  
Internal Calibration ◽  
Noise Ratio ◽  
High Degree ◽  
Installation Time

abstract A movable array composed of Ranger type seismometers, 60-day film recorders and 7-day magnetic tape recorders housed in compact trailers, has been developed. The array is useful for research requiring frequent instrument relocation such as P-delay, micro-seismicity, aftershock and signal-to-noise ratio studies. The array unit combines the functions found in conventional fixed stations with a high degree of mobility. Conveniences such as solid state amplifiers, radio and clock circuitry, internal calibration, and minimum installation time are special features. With the battery supply provided, a one week period of unattended film and tape recording is possible. With commercial power, the instruments can operate unattended for up to sixty days. Useful magnification up to several million is available, depending on the frequency band selected.

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