DENNIS HANCOCK



Dennis@DennisHancock.com




Hello Friend!

I live on the Northern California Peninsula and work both as an Electro-Optics Applied Physicist and Developer of 3D Modeling and Simulation Algorithms for Science and Engineering.

A salute to the people who help me get down the road.

I'm authoring the world famous Photographic Lens Performance blog.

Photo restoration is a fun avocation that brings together many skills from my professional experiences.




My Resume

My Resume

My Resume



3D Technical Modeling Examples I've Authored




3D Ray Tracing The Atmosphere

3D Ray Tracing A City


3D Ray Tracing A Walking Man

3D Ray Tracing From Space

3D Ray Tracing Atmosphere Example
3D Ray Tracing City Example

3D Ray Tracing Human Example
Somewhere On Planet Earth

Click For A Differential Ray Tracing Example

Click For Urban MultiPath Ray Tracing Example


Click For Doppler Spectrum Of Walking Human

Click For Radar Altimetry Waveform Calculation




SAR Lab Experiment


Haptics



Raytrace Of A Lab SAR Experiment

Click Here To Get A Feel For The Computer Interface Of The Future


Raytraced Echo Paths For A Bi-static Radar,
A Corner Cube, And Three Reflecting Surfaces


The Coolest Thing Ever Done With Computers.
Still.
Click For The Details




Some Optics Efforts I've Modeled And/Or Performed




Repairing The Hubble Telescope

Procedural Ray Tracing


Geometric Distortion

Adaptive Optics

A New Way To Do Optics

Slaving Away Over A Hot Optical Bench
My AO Brassboard

Click For More Details

Click Here For A New Way To Do Optics


Click For An Optical Metrology Experiment

An AO Testbed I Developed


Ultra High Precision Optical Geometric Distortion Measurement


For Measurement Of Geometric Distortion To 10nm Levels, It's Mandatory To Know The Exact Shape of Your System's Point Spread Function Across The Entire Field.
Here, I Show My Computations Of The Axial PSFs For A Single Field Position
For The Ideal Case Of Aberration Free Imaging And Three Realizations Of System Apodization.

"If you don't model it, you're likely not to measure it."



Partially Coherent Imaging With DeFocus Aberration


Some Imaging Applications Need To Consider Electric Field Coherency And Optical Aberrations To Predict Performance With High Accuracy.
Here, Diffraction Elliptical Spot Images Are Formed On A Tilted Plane Assuming Incoherent, Partially Coherent, And Fully Coherent E-Fields With Varying Amounts Of Defocus Aberration.
A Hypothetical Optic Is Trying To Form The Same Image (Green Oval) In All Frames. A Transparent, Black Box is Drawn For Reference.
Aberrations From An Actual Optical Design Are Easily Accommodated And Alter These Results Accordingly.
Vertical Scaling Is Log10 And All Frames Are Normalized By The Diffraction Limited Case.

"If you don't model it, you'll likely not understand it."



Satellite Radar Altimeter Echo Return Over An Ocean/Land Interface


This simulation shows the return echo from a satellite radar situated over a 3D lidar-acquired island model (42.583368N, 10.079077E.)
The altimeter is placed 695Km above the white square (lower left,) ensuring first returns come from land.
This island has a maximum height of 29 m and an average height of 10m above the sea.
Each frame is spaced by 3.125 nano-seconds.
Color coded returns: Vegetation-->Green; Land and Buildings-->Red; Rough, Gaussian Ocean-->Yellow.



Send an e-mail to: Dennis
Author:Dennis M Hancock
Last Updated: 25Aug16


Cogito. Ergo Scio.


All Text, Pictures, and Animations on this website are copyrighted by the author



My photography has come a long way since taking pictures of my grand daughter Nica Della-Dora