Nonlinear effects in the photon counting regime owing to the dead time and fluctuations of the excitation source

1989 ◽  
Vol 32 (2) ◽  
pp. 133-135
Author(s):  
M. A. Ivanov
Keyword(s):  
Dead Time ◽  
Photon Counting ◽  
Nonlinear Effects ◽  
Excitation Source ◽  
The Dead

Full-waveform distortion characteristics of photon counting Lidar at different dead-time

Optik ◽  
2020 ◽  
Vol 223 ◽  
pp. 165448
Author(s):  
Ahui Hou ◽  
Yihua Hu ◽  
Nanxiang Zhao ◽  
Jiajie Fang ◽  
Shilong Xu ◽  
...  
Keyword(s):  
Dead Time ◽  
Photon Counting ◽  
Full Waveform ◽  
Waveform Distortion

scholarly journals Dead-Time Correction Applied for Extended Flux-Based Sensorless Control of Assisted PMSMs in Electric Vehicles

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 220
Author(s):  
Cheng Lin ◽  
Jilei Xing ◽  
Xingming Zhuang
Keyword(s):  
Control System ◽  
Electric Vehicles ◽  
Dead Time ◽  
Sensorless Control ◽  
Correction Method ◽  
Time Effect ◽  
Dead Time Correction ◽  
Speed Range ◽  
Time Correction ◽  
The Dead

Sensorless control technology of PMSMs is of great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has great performance over all speed range. However, the accuracy and reliability of the extended flux rotor position observer are greatly affected by the dead-time effect. In this paper, the extended flux-based observer is adopted to develop a sensorless control system. The influence of dead-time effect on the observer is analyzed and a dead-time correction method is specially designed to guarantee the reliability of the whole control system. A comparison of estimation precision among the extended flux-based method, the electromotive force (EMF)-based method and the high frequency signal injection method is given by simulations. The performance of the proposed sensorless control system is verified by experiments. The experimental results show that the proposed extended flux-based sensorless control system with dead-time correction has satisfactory performance over full speed range in both loaded and non-loaded situations. The estimation error of rotor speed is within 4% in all working conditions. The dead-time correction method improves the reliability of the control system effectively.

scholarly journals Adopting pade approximation for first order plus dead time models for blending process

2018 ◽  
Vol 7 (4) ◽  
pp. 2800
Author(s):  
Avani Kirit Mehta ◽  
R. Swarnalatha
Keyword(s):  
Dead Time ◽  
Padé Approximation ◽  
Continuous Process ◽  
Process Variable ◽  
Pade Approximation ◽  
Process Systems ◽  
First Order ◽  
Blending Process ◽  
The Dead ◽  
Control Feedback

Dead-time is common to real time processes and occurs when the process variable doesn’t acknowledge to any changes in the set point. Existence of dead time in the systems poses a challenge to control and stabilize, especially in a control feedback loop. Padé approximation provides a determinate approximation of the dead time in the continuous process systems, which can be utilized in the further simulations of equivalent First Order plus Dead Time Models. However, the standard Padé approximation with the same numerator- denominator derivative power, exhibits a jolt at time t=0. This gives an inaccurate approximation of the dead time. To avoid this phenomenon, increasing orders of Padé approximation is applied. In the following manuscript, equivalent First Order plus Dead-Time models of two blending systems of orders four and seven are analysed for the same. As the orders of the Padé approximation increases, the accuracy of the response also increases. The oscillations are increased on a much smaller scale rather than having one big dip in the negative region (as observed in the first few orders of Padé approximation), and the approximation tries to synchronize with the desired response curve in the positive region. All the simulations are done in MATLAB.  

Dead-Time Corrections to Photon Counting Distributions

1966 ◽  
Vol 16 (13) ◽  
pp. 589-592 ◽  
Author(s):  
F. A. Johnson ◽  
R. Jones ◽  
T. P. McLean ◽  
E. R. Pike
Keyword(s):  
Dead Time ◽  
Photon Counting

Transient effect of dead time of photon-counting in micro-pulse lidar

2015 ◽  
Vol 23 (2) ◽  
pp. 408-414
Author(s):  
杨子健 YANG Zi-jian ◽  
陈锋 CHEN Feng ◽  
李抄 LI Chao ◽  
吴太虎 WU Tai-hu
Keyword(s):  
Dead Time ◽  
Photon Counting ◽  
Transient Effect ◽  
Micro Pulse Lidar
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