scholarly journals Can Liquid Lenses Increase Depth of Field in Head Mounted Video See-Through Devices?

2021 ◽  
Vol 7 (8) ◽  
pp. 138
Author(s):  
Marina Carbone ◽  
Davide Domeneghetti ◽  
Fabrizio Cutolo ◽  
Renzo D’Amato ◽  
Emanuele Cigna ◽  
...  
Keyword(s):  
Control System ◽  
Clinical Practice ◽  
Augmented Reality ◽  
Time Of Flight ◽  
Depth Of Field ◽  
Liquid Lenses ◽  
Good Potential ◽  
Distance Sensor ◽  
Limited Depth ◽  
Lens Optics

Wearable Video See-Through (VST) devices for Augmented Reality (AR) and for obtaining a Magnified View are taking hold in the medical and surgical fields. However, these devices are not yet usable in daily clinical practice, due to focusing problems and a limited depth of field. This study investigates the use of liquid-lens optics to create an autofocus system for wearable VST visors. The autofocus system is based on a Time of Flight (TOF) distance sensor and an active autofocus control system. The integrated autofocus system in the wearable VST viewers showed good potential in terms of providing rapid focus at various distances and a magnified view.

Time-of-Flight Kameratechnik für Augmented Reality in der computergestützten Chirurgie

2011 ◽  
pp. 219-223
Author(s):  
S. Mersmann ◽  
M. Müller ◽  
A. Seitel ◽  
F. Arnegger ◽  
R. Tetzlaff ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Time Of Flight

Data acquisition and control system for the neutron time-of-flight spectrometer MIBEMOL

1993 ◽  
Vol 7 (6) ◽  
pp. 714
Author(s):  
W. Wegener ◽  
P. D’Hooghe ◽  
W. De Boeck
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Time Of Flight ◽  
Neutron Time ◽  
And Control

Data Acquisition and Control System for the IPNS Time-of-Flight Neutron Scattering Instruments

1979 ◽  
Vol 26 (4) ◽  
pp. 4554-4563 ◽  
Author(s):  
R. T. Daly ◽  
J. R. Haumann ◽  
M. R. Kraimer ◽  
F. R. Lenkszus ◽  
W. P. Lidinsky ◽  
...  
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Neutron Scattering ◽  
Time Of Flight ◽  
And Control

scholarly journals Online control of combine reel height in presence of farm roughness using an on-off controller

2019 ◽  
Vol 13 (2) ◽  
pp. 104-109
Author(s):  
Nadia Zendehdel ◽  
Younes Shamoradi
Keyword(s):  
Control System ◽  
Laboratory Sample ◽  
Height Control ◽  
Optical Distance ◽  
Normal Probability ◽  
Height Change ◽  
Distance Sensor ◽  
Normal Probability Distribution ◽  
Controllability And Observability ◽  
Excitation Circuit

Adjusting the harvesting combine reel height in presence of the farm rough surface reduces the harvest losses, prevents possible damage to the headland and increases gravel harvest. Regarding the importance of the issue, in this study, the dynamics of the reel height control system of the John Deere1055 combine was modeled and the controllability and observability of the obtained transfer function is determined in state space. After that, with the aim of cutting the stem from a suitable point, an on-off controller is designed to keep the reel height from the ground in a permitted range. At this stage, a reduced model system is used as an approximated system to design a controller. The designed controller is simulated in MATLAB. In this simulation, the roughness of the ground was considered as the control loop noise with the normal probability distribution function. The results confirm that the reel height change is kept in the specified range against the farm roughness. The laboratory sample was also constructed using an independent excitation circuit DC motor, an optical distance sensor, and a micro controller. The experimental test shows that the height control system responses to changes in surface height at an appropriate speed without any oscillation in range.

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