Experimental measurement of tilt correlation with higher-order modes in the time domain for turbulence-induced phase aberrations: implications to airborne laser beam steering

1998 ◽  
Author(s):  
Matthew R. Whiteley ◽  
Patrick J. Gardner
Keyword(s):  
Laser Beam ◽  
Time Domain ◽  
Experimental Measurement ◽  
Beam Steering ◽  
Higher Order ◽  
Higher Order Modes ◽  
Airborne Laser ◽  
The Time Domain ◽  
Phase Aberrations

Modeling of a Dynamic Mirror Actuator

2010 ◽  
Author(s):  
James A. Mynderse ◽  
George T. C. Chiu
Keyword(s):  
Experimental Data ◽  
Laser Beam ◽  
Linear Model ◽  
Natural Frequency ◽  
Beam Steering ◽  
Constitutive Models ◽  
Higher Order ◽  
Piezoelectric Stacks

A novel dual-actuated dynamic mirror actuator (DMA) is presented for laser beam steering. The DMA is driven by a pair of piezoelectric stack actuaors (PESAs). The piezoelectric stacks are modeled using a linear model and five variations of constitutive models from literature. The resulting DMA models are simulated. While the constitutive models capture some higher order dynamics, the linear model provides the best combination of accuracy to experimental data and simplicty of model between DC and the first natural frequency of the DMA. For control of the DMA up to the first natural frequency of the DMA, a linear model should be adequate.

Determination of the time-domain equivalents of higher-order Laplace transfer functions by analog computation

SIMULATION ◽  
1970 ◽  
Vol 14 (3) ◽  
pp. 123-128
Author(s):  
Jesús León ◽  
Emilio E. Herrero
Keyword(s):  
Time Domain ◽  
Transfer Functions ◽  
Order Approximation ◽  
Analog Computer ◽  
Higher Order ◽  
Analog Computation ◽  
Use Of Time ◽  
The Time Domain ◽  
Low Order

In the theory of optimal inventory control, a class of com plex Laplace transforms arises for which the theoretist needs to know the form and shape of the time domain equivalents. Several methods have been used to obtain these time domain equivalents. In this paper simulation by analog computer has been used, and a low-order approximation of higher-order transfer functions has been simulated. The accuracy of this low-order approximation has been de termined by use of time domain plots.

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