A Non-Contact Micro-Ampere DC Current Digital Sensor Based on the Open-Loop Structure

2020 ◽  
pp. 1-1
Author(s):  
Lei Zhou ◽  
Qing Chen ◽  
Hongbin Li ◽  
Shiwu Yang ◽  
Pang Dongxiao ◽  
...  
Keyword(s):  
Open Loop ◽  
Loop Structure ◽  
Dc Current

scholarly journals A novel demodulation algorithm for VHF Data Broadcast signals in multi-sources augmentation navigation system

2020 ◽  
Vol 16 (3) ◽  
pp. 155014772091477
Author(s):  
Hongwei Zhao ◽  
Zichun Zhang ◽  
Xiaozhu Shi ◽  
Yihui Yin
Keyword(s):  
Navigation System ◽  
Signal To Noise Ratio ◽  
Open Loop ◽  
Timing Recovery ◽  
Loop Structure ◽  
Frame Synchronization ◽  
Source Information ◽  
Carrier Synchronization ◽  
Data Broadcast ◽  
Training Symbol

The augmentation navigation system based on multi-source information fusion can significantly improve position accuracy, and the multi-source information is usually transmitted through VHF Data Broadcast . Aiming at the burst characteristics of VHF Data Broadcast, this article proposed a novel demodulation algorithm based on open-loop structure. When a VHF Data Broadcast burst is detected, the timing recovery should be finished first, and the value of cross-correlation between the timing-recovered signal and the local training symbol is calculated to complete the frame synchronization. Then, the data-aided and non-data-aided algorithms are used to estimate the frequency offset. Finally, the phase offset is estimated and the carrier synchronization is accomplished. The simulation results demonstrate that the proposed algorithm can quickly accomplished carrier synchronization without using feedback-loop structure, and the bit error rate is less than 10−4 when the signal-to-noise ratio is greater than 17 dB, which satisfy the requirement of receiving VHF Data Broadcast signals in augmentation navigation system. Therefore, the proposed algorithm can be used for receiving VHF Data Broadcast signals.

scholarly journals Error Uncertainty Analysis in Planar Closed-Loop Structure with Joint Clearances

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1872
Author(s):  
Yushu Yu ◽  
Jinglin Li ◽  
Xin Li ◽  
Yi Yang
Keyword(s):  
Joint Distribution ◽  
Error Probability ◽  
Closed Loop ◽  
Open Loop ◽  
Distribution Functions ◽  
Positional Error ◽  
Loop Structure ◽  
Virtual Link ◽  
Joint Clearances ◽  
Probability Density Function Pdf

For planar closed-loop structures with clearances, the angular and positional error uncertainties are studied. By using the vector translation method and geometric method, the boundaries of the errors are analyzed. The joint clearance is considered as being distributed uniformly in a circle area. A virtual link projection method is proposed to deal with the clearance affected length error probability density function (PDF) for open-loop links. The error relationship between open loop and closed loop is established. The open-loop length PDF and the closed-loop angular error PDF both approach being Gaussian distribution if there are many clearances. The angular propagation error of multi-loop structures is also investigated by using convolution. The positional errors of single and multiple loops are both discussed as joint distribution functions. Monte Carlo simulations are conducted to verify the proposed methods.

scholarly journals Tunneling Magnetoresistance DC Current Transformer for Ion Beam Diagnostics

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3043
Author(s):  
Eman Azab ◽  
Yasser G. Hegazy ◽  
Hansjoerg Reeg ◽  
Marcus Schwickert ◽  
Klaus Hofmann
Keyword(s):  
Giant Magnetoresistance ◽  
Closed Loop ◽  
Ion Beam ◽  
Noise Analysis ◽  
Selection Criterion ◽  
Current Transformer ◽  
Open Loop ◽  
Tunneling Magnetoresistance ◽  
Beam Diagnostics ◽  
Dc Current

In this paper, open loop and closed loop Tunneling Magnetoresistance (TMR) DC Current Transformers (DCCTs) for ion beam diagnostics are presented. The DCCTs employ MR sensors to measure the DC component of the accelerator’s ion beam. A comparative study between Giant Magnetoresistance (GMR) and TMR sensors is presented to illustrate the sensor selection criterion for the DCCT application. The two proposed DCCTs are studied in open and closed loop configurations. A closed loop feedback electronic system is designed to generate a feedback current equivalent to the ion beam current such that the sensor operates at zero flux. Furthermore, theoretical and experimental results for the TMR-based DCCT including noise analysis are presented for both open loop and closed loop configurations. Both configurations’ minimum detectable currents are in the range of microampere. The proposed closed loop hardware prototype has a settling time of less than 15 μs. The measured minimum detectable currents for the open and closed loop TMR-based DCCTs are 128.2 μA/Hz and 10.14 μA/Hz at 1 Hz, respectively.

Upgrade Fe-50%Ni alloys for open-loop DC current sensor: Design and alloy-potential characteristics

2006 ◽  
Vol 304 (2) ◽  
pp. e850-e852 ◽  
Author(s):  
Thierry Waeckerlé ◽  
Hervé Fraisse ◽  
Quentin Furnemont ◽  
Frédéric Bloch
Keyword(s):  
Open Loop ◽  
Current Sensor ◽  
Sensor Design ◽  
Ni Alloys ◽  
Dc Current

CLASSIFICATION OF CHAOTIC SEQUENCES WITH OPEN-LOOP ESTIMATOR — OPTIMAL DESIGN FOR NOISY ENVIRONMENTS

2004 ◽  
Vol 14 (09) ◽  
pp. 3023-3043
Author(s):  
THOMAS SCHIMMING ◽  
FEDERICO BIZZARRI ◽  
MARCO STORACE ◽  
MARTIN HASLER
Keyword(s):  
System Approach ◽  
Open Loop ◽  
Measurement Noise ◽  
Noise Model ◽  
Loop Structure ◽  
Noisy Environments ◽  
Chaotic Sequences ◽  
Ergodic Properties ◽  
Special Case

In this paper, an approach based on ergodic properties for classifying chaotic sequences is given. It is particularly robust due to the open-loop structure of the detector. Unlike previous works in this direction, such as those concerning the inverse system approach, the detector is not uniquely determined by the transmitter (identical or subsystem thereof), but instead depends on the measurement noise model. The classification is optimized under such imperfect observation conditions. The method is introduced in general for the case of chaotic sequences generated by ergodic maps, and a special case is analyzed in detail to illustrate the method. This special example resorts to Tchebychev maps and some additional symmetries to make up a simple signaling scheme which is low in complexity on both transmitter and receiver sides, while at the same time relatively robust, due to the open-loop structure of the detector.

968: Gelsolin Gene Silencing Involving Unusual Chromatin Structures and a Novel Stem Loop Structure of the Promoter Region in Human Bladder Cancer

2004 ◽  
Vol 171 (4S) ◽  
pp. 256-257
Author(s):  
Kazunori Haga ◽  
Ataru Sazawa ◽  
Toru Harabayashi ◽  
Nobuo Shinohara ◽  
Minoru Nomoto ◽  
...  
Keyword(s):  
Bladder Cancer ◽  
Gene Silencing ◽  
Promoter Region ◽  
Loop Structure ◽  
Human Bladder Cancer ◽  
Human Bladder ◽  
Stem Loop ◽  
Stem Loop Structure
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