OddballsCritical Design Review

Team 8: Grant Fritz, Jessica Brown, Stephanie Jalovec, Jennifer McGraw, Brian

Roth, Evan Townsend

10/18/07

Mission Statement

• The purpose of this mission is to capture video of the sky at an altitude of 30 km using a balloon satellite in order to capture images of stars as they immerge in higher altitudes.

Mission Overview• The mission is to determine the intensity of stars visible

during the day at 30km using a calibration lamp as a standard.

• The goal is to further develop the idea that a telescope can be used on a balloon satellite platform. A high altitude platform would be less expensive than a space telescope.

– Smaller telescopes can be used to get images of similar quality to large ground-based telescopes.

– With an affordable method of observation, more people will be able to have access to space imaging.

– Balloon satellite would be above the clouds, which can often prevent astronomers on earth from observing.

– Can be serviced between each launch.

The purpose of this mission is to capture video of the sky at an altitude of 30 km using a balloon satellite in order to capture images

of stars as they immerge in higher altitudes. Construct Balloon

Satellite to improve understanding of

high altitude conditions at 30 km

for under $200 dollars by 11/10/07

Images of the stars shall be captured

using a CCD video camera and a still

image digital camera.

A large helium weather balloon shall be used to acquire an

altitude of 30km

The structure of the balloon satellite shall be in the shape of a

dodecahedron.

A budget of $200 dollars shall be maintained while keeping the mass of the

balloon satellite under 800g.

The CCD camera shall be angled upward at 54°

from horizontal, mounted on one

of the faces of the upper half of the dodecahedron.

Imaging the sky at 30 km shall improve

understanding of high altitude conditions by showing what

magnitude stars can be seen during the

day.

The digital camera shall be angled

upward at 54° from horizontal and

mounted on another upward facing side

of the dodecahedron opposite the CCD

camera.

The digital camera shall be an HP

PhotoSmart digital camera.

The structure of the balloon satellite shall be in the shape of a dodecahedron.

Design• Parts

– 1500 cm2 Foam Core Provided– 1 Digital HP Photosmart E427 camera Provided– 1 GB Memory chip Provided– 1 Timing circuit kit Provided– 1 HOBO data logger Provided– 1 Heater kit Provided– 12 9Volt Batteries Provided– 12 12V Batteries Provided– 1 Roll of aluminum tape Provided– 1 Roll of Electrical tape Provided – 1 PVC tube Provided– 1 (PC164 CCD Camera) Provided by Eliot

Young– 1 Video Recorder-7 Ordered through Eliot Young– Pentax Lens for PC 164 Provided by Eliot

Young– Calibration Lamp Created by team

Design

Design

Switch

Timing Circuit

12v Battery

HP Still Cam (2 internal AA bat)

12v Battery 12v Battery

Switch

CCD Camera

SwitchVideo Recorder

(internal battery and record button)

12v Battery

Heater

Switch

9V Battery 9V Battery 9V Battery

HOBO

External Temp Internal Temp Humidity

DesignItem Mass (g) Cost ($)

1500 cm2 Foam Core 40 5

1 Digital HP Photosmart E427 camera

219.8 99.99

1 GB Memory chip 2 27.99

1 HOBO data logger 29 49.99

1 Heater kits 34.4 5

5 Switches 15 5

12 9Volt Batteries 3 x 45 2

12 12V Batteries 4 x 14.4 2.99

1 Roll of aluminum tape 1 25

1 (PC180XS B/W Ex View Cube Camera)

25 118.85

1 MVideo Recorder-7 100 378.93

1 PVC tube 10 .50

hot glue and glue gun 1 8

Total 669.8 729.24 (although all items have been provided)

Schedule

Week 6:Oct. 22-28

Design Doc. Rev CWhip, Drop, Stair, Cold Tests

Week 7:Oct. 29- Nov. 4

Design Doc. Rev CComplete designFinish building satellite (place camera’s, HOBO, and heater in

assigned spots) Functional test

Week 8:Nov. 5-11

LRR MeetingDesign Doc. Rev C DUE (Thursday)LAUNCH Saturday morning! Be there at 5:00AM!

Week 9:Nov. 12-18

Design Doc. Rev D

Week 10Nov. 19-25

Design Doc. Rev DDesign Doc. Rev D DUE (Thursday)

Week 11Nov. 26-Dec. 2

Final Presentation

Week 12Dec. 3-9

Final Presentation DUEPresent Final Presentation in class

Job Delegation

Team Member:

Project Manager

Testing Structures Integration CNDH Systems

Grant X Imaging Test

CCD

Jessica Stair Test X CCD

Stephanie Functional Test

X CCD

Jennifer Drop Test X HP Cam

Brian Cold Test X Heater

Evan Whip Test X X HOBO

Drop Test

• We will perform 3 separate drop tests to simulate different possible landing sites– Balcony between ITLL and DLC– Balcony on East side of DLC– South Side Balcony of ITLL

Cold Test

• Hang Satellite inside cooler filled with dry ice

• Prevent satellite from actually touching the ice

Whip Test

• We shall use objects that will imitate the weight and size of the subsystems

• We will swing the satellite on a 1.5 meter string to simulate the g-forces of flight.

Stare Stair Test

• Drop down stairs in the DLC

• Simulate multiple impacts of landing

Subsystems Test

• Test heater for heat out put.• Test capability of CCD camera to see stars at

ground level– Ability to see 9th magnitude stars

• Test capability of HP digital camera to see stars at ground level

• Test timing circuit for functionality• Test hobo during Cold test• Test quality of DVR• Test calibration lamp for effectiveness

Final Test

Mission Simulation Test

• Test all systems for expected duration of the mission

Functional Test• Test all subsystems in

concurrence• Precedes mission sim

test

Expected Results

• We expect the faintest stars visible at 30 km to be approximately 9th magnitude.

• We expect to find the magnitudes of stars observed by comparing them to the standard lamp