Design and optimization of compact freeform lens array for laser beam splitting: a case study in optimal surface representation

2014 ◽  
Author(s):  
Milan Maksimovic
Keyword(s):  
Laser Beam ◽  
Beam Splitting ◽  
Surface Representation ◽  
Lens Array ◽  
Design And Optimization ◽  
Optimal Surface ◽  
Freeform Lens

Thermal Frequency Imaging: A New Application of Laser Voltage Imaging Applied on 40nm Technology

2011 ◽  
Author(s):  
Guillaume Celi ◽  
Sylvain Dudit ◽  
Thierry Parrassin ◽  
Philippe Perdu ◽  
Antoine Reverdy ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Laser Beam ◽  
Integrated Circuit ◽  
Carrier Density ◽  
Deep Submicron ◽  
Charge Carrier Density ◽  
Voltage Imaging ◽  
A New Technique ◽  
Scan Chain

Abstract For Very Deep submicron Technologies, techniques based on the analysis of reflected laser beam properties are widely used. The Laser Voltage Imaging (LVI) technique, introduced in 2009, allows mapping frequencies through the backside of integrated circuit. In this paper, we propose a new technique based on the LVI technique to debug a scan chain related issue. We describe the method to use LVI, usually dedicated to frequency mapping of digital active parts, in a way that enables localization of resistive leakage. Origin of this signal is investigated on a 40nm case study. This signal can be properly understood when two different effects, charge carrier density variations (LVI) and thermo reflectance effect (Thermal Frequency Imaging, TFI), are taken into account.

Thermal Protection System (TPS) Design and Optimization - A Case Study

Space 2005 ◽  
2005 ◽  
Author(s):  
Amarshi Bhungalia ◽  
Timithy Fry ◽  
Daniel Tejtel ◽  
Jess Sponable
Keyword(s):  
Thermal Protection ◽  
Thermal Protection System ◽  
Protection System ◽  
Design And Optimization

A new diamond machining approach for extendable fabrication of micro-freeform lens array

2018 ◽  
Vol 124 ◽  
pp. 134-148 ◽  
Author(s):  
Wu-Le Zhu ◽  
Fang Duan ◽  
Xiaodong Zhang ◽  
Zhiwei Zhu ◽  
Bing-Feng Ju
Keyword(s):  
Lens Array ◽  
Diamond Machining ◽  
Freeform Lens

Generation of Olympic logo with freeform lens array

2017 ◽  
Author(s):  
Tingdi Liao ◽  
Chengkun Liu ◽  
Yishen Qiu ◽  
Weijuan Chen ◽  
Qilu Huang
Keyword(s):  
Lens Array ◽  
Freeform Lens

scholarly journals Numerical Simulation and Design of Multi-Tower Concentrated Solar Power Fields

2020 ◽  
Vol 12 (6) ◽  
pp. 2402
Author(s):  
Zaharaddeen Ali Hussaini ◽  
Peter King ◽  
Chris Sansom
Keyword(s):  
Solar Power ◽  
Field Configuration ◽  
Energy Output ◽  
Concentrated Solar Power ◽  
Optical Efficiency ◽  
Study Region ◽  
Design And Optimization ◽  
Total Plant ◽  
Levelized Cost Of Heat

In power tower systems, the heliostat field is one of the essential subsystems in the plant due to its significant contribution to the plant’s overall power losses and total plant investment cost. The design and optimization of the heliostat field is hence an active area of research, with new field improvement processes and configurations being actively investigated. In this paper, a different configuration of a multi-tower field is explored. This involves adding an auxiliary tower to the field of a conventional power tower Concentrated Solar Power (CSP) system. The choice of the position of the auxiliary tower was based on the region in the field which has the least effective reflecting heliostats. The multi-tower configuration was initially applied to a 50 MWth conventional field in the case study region of Nigeria. The results from an optimized field show a marked increase in the annual thermal energy output and mean annual efficiency of the field. The biggest improvement in the optical efficiency loss factors be seen from the cosine, which records an improvement of 6.63%. Due to the size of the field, a minimal increment of 3020 MWht in the Levelized Cost of Heat (LCOH) was, however, recorded. In much larger fields, though, a higher number of weaker heliostats were witnessed in the field. The auxiliary tower in the field provides an alternate aim point for the weaker heliostat, thereby considerably cutting down on some optical losses, which in turn gives rise to higher energy output. At 400 MWth, the multi-tower field configuration provides a lower LCOH than the single conventional power tower field.

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