scholarly journals Combining Charge Couple Devices and Rate Sensors for the Feedforward Control System of a Charge Coupled Device Tracking Loop

Sensors ◽  
2016 ◽  
Vol 16 (7) ◽  
pp. 968 ◽  
Author(s):  
Tao Tang ◽  
Jing Tian ◽  
Daijun Zhong ◽  
Chengyu Fu
Keyword(s):  
Control System ◽  
Feedforward Control ◽  
Tracking Loop ◽  
Charge Coupled Device ◽  
A Charge ◽  
Device Tracking

Error-Based Feedforward Control for a Charge-Coupled Device Tracking System

2019 ◽  
Vol 66 (10) ◽  
pp. 8172-8180 ◽  
Author(s):  
Tao Tang ◽  
Tao Yang ◽  
Bo Qi ◽  
Ge Ren ◽  
Qiliang L. Bao
Keyword(s):  
Feedforward Control ◽  
Tracking System ◽  
Charge Coupled Device ◽  
A Charge ◽  
Device Tracking

scholarly journals Error-Based Observer of a Charge Couple Device Tracking Loop for Fast Steering Mirror

Sensors ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 479 ◽  
Author(s):  
Tao Tang ◽  
Chao Deng ◽  
Tao Yang ◽  
Daijun Zhong ◽  
Ge Ren ◽  
...  
Keyword(s):  
Charge Couple Device ◽  
Tracking Loop ◽  
A Charge ◽  
Device Tracking

Control of coagulation process by dual wavelength article analyzer

1997 ◽  
Vol 36 (4) ◽  
pp. 135-142 ◽  
Author(s):  
Norihito Tambo ◽  
Yoshihiko Matsui ◽  
Ken-ichi Kurotani ◽  
Masakazu Kubota ◽  
Hirohide Akiyama ◽  
...  
Keyword(s):  
Water Quality ◽  
Control System ◽  
Predictive Control ◽  
Control Method ◽  
Feedforward Control ◽  
Raw Water ◽  
Floc Size ◽  
Coagulation Process ◽  
Series Of Experiments ◽  
Size Data

A coagulation process for water purification plants mainly uses feedforward control based on raw water quality and empirical data and requires operator's help. We developed a new floc sensor for measuring floc size in a flush mixer to be used for floc control. A control system using model predictive control was developed on the floc size data. A series of experiments was performed to confirm controllability of settled water quality by controlling flush mixer floc size. An automatic control with feedback from the coagulation process was evaluated as practical and reliable. Finally this new control method was applied for actual plant and evaluated as practical.

Feasibility Study of the Novel Nitrification Control System with Feedback and Auto Calibration Feedforward Control

2015 ◽  
Vol 2015 (2) ◽  
pp. 1-5
Author(s):  
Ichiro Yamanoi ◽  
Yoshinori Nishida ◽  
Nobuyuki Nakamura ◽  
Takeshi Takemoto ◽  
Kenji Toyooka ◽  
...  
Keyword(s):  
Control System ◽  
Feasibility Study ◽  
Feedforward Control ◽  
The Novel

scholarly journals Spectroscopic flat-fields can be used for precision CCD gain and noise tests

2021 ◽  
Vol 38 ◽  
Author(s):  
J. Gordon Robertson
Keyword(s):  
Ccd Camera ◽  
Matched Pair ◽  
Optical Fibres ◽  
Charge Coupled Device ◽  
Small Areas ◽  
Flat Field ◽  
Basic Parameters ◽  
The Mean ◽  
A Charge ◽  
Analogue To Digital

Abstract One of the basic parameters of a charge coupled device (CCD) camera is its gain, that is, the number of detected electrons per output Analogue to Digital Unit (ADU). This is normally determined by finding the statistical variances from a series of flat-field exposures with nearly constant levels over substantial areas, and making use of the fact that photon (Poisson) noise has variance equal to the mean. However, when a CCD has been installed in a spectroscopic instrument fed by numerous optical fibres, or with an echelle format, it is no longer possible to obtain illumination that is constant over large areas. Instead of making do with selected small areas, it is shown here that the wide variation of signal level in a spectroscopic ‘flat-field’ can be used to obtain accurate values of the CCD gain, needing only a matched pair of exposures (that differ in their realisation of the noise). Once the gain is known, the CCD readout noise (in electrons) is easily found from a pair of bias frames. Spatial stability of the image in the two flat-fields is important, although correction of minor shifts is shown to be possible, at the expense of further analysis.

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