Camera Protection using Sun Sensor-Shutter Device. 22-July 2008 Jay Jiaquan Zheng. Mentor: Dennis Douglas. Overview of Sun Sensor – Shutter Device. Analogy: Human Eye & Camera Purpose Of Sun Sensor – Shutter Device Introduction of Sun Sensor – Shutter Device System Diagram
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Camera Protection using Sun Sensor-Shutter Device
Jay Jiaquan Zheng
Mentor: Dennis Douglas
……There’s a reason they tell you not to look into the sun!
Preliminary Design Locates Sun Sensor & Shutter Device On A Telescope
Ray-Box, pinhole in
detector in the back.
Rack & Pinion
assembly driven by
Optical Power Input
Slider –Crank Mechanism
Overall System Diagram Links Functionalities
Of COTS And Custom Components
COTS = Commercial Off The Shelf Components
Sun Position 1
Sun Position 2
Optical Power Meter outputs voltage depends on incident light
Microprocessor could only
read digital signals.
Rack & Pinion
If it takes 10 seconds for your eyelid to close when looking directly at the Sun…
Rack & Pinion Assembly
Designed using Dynamic Analysis.
on sliding distance.
Superimposing All Major Components Allows For Analysis Of Effective Shutter Design
Note: All terms defined in Position Analysis except slider velocity , or vs .
T – motor torque x – rack displacement
R – gear radius I – gear inertiam – rack mass
Block Diagram Demonstrates Design Process
And Components Specifications of Shutter Device
GUI Interface Allows User Input To Optimize
Design Based On System Parameters and Variables
Effective Sun Sensor-Shutter Device can be constructed using Commercial Off The Shelf and custom components.
Modeling suggests this device will have a time response of 0.4 seconds and perform safely.
Future goal is to determine costs of COTS and custom equipments and integration plan...
Daron Nishimoto, Riki Maeda, Chet Jonston
Lani LeBron, Scott Seagroves,
Lynne Raschke, Lisa Hunter
The Akamai Internship Program is funded by the Center for Adaptive Optics through its National Science Foundation Science and Technology Center grant (#AST-987683) and by grants to the Akamai Workforce Initiative from the National Science Foundation and Air Force Office of Scientific Research (both administered by NSF, #AST-0710699) and from the University of Hawaii.