Echo Final Presentation

Andrew Berg, Shawn Carroll, Cody Humbargar, Jade Nelson, Jared Russell, Austin Williamson

12-05-06

Mission Overview

Main Science Mission-

• Test the effect of air pressure on sound waves.

• Compare sounding data to EOSS pressure data.

Secondary Science Mission-

• HOBO data logger used to measure internal and external temperature during flight

• HOBO also used to test humidity levels inside balloon-satellite.

Non-Science Mission-

• Using main imaging hardware to take photographs during flight.

• Secondary imaging hardware will using ultraviolet / infrared filters to take photographs.

Design

• Balloon satellite measuring 150mm x 145mm x 100mm.

• Cameras face same direction

-Primary ELF

-Secondary 35mm IR Photography

• Main science system will be shock mounted

• Compact internal arrangement

• Atmospheric venting through desiccant

Science Signal Flow

HOBO

Rectifier/Limiter

Microphone

Driver

Oscillator

Design Pictures

RFP Satisfaction

Payload will be ready to fly by the end of the week

Mass and financial budget were not exceeded

Other RFP requirements met

Results and Analysis

•Expected Results–Linear correlation–Possible correlation with temperature

•Data Analysis–EOSS Pressure Data–Derived pressure based on altitude (General Case)–Running average of voltage data

Voltage vs. Time

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7:17:41 AM7:22:41 AM7:27:41 AM7:32:41 AM7:37:41 AM7:42:41 AM7:47:41 AM7:52:41 AM7:57:41 AM8:02:41 AM8:07:41 AM8:12:41 AM8:17:41 AM8:22:41 AM8:27:41 AM8:32:41 AM8:37:41 AM8:42:41 AM8:47:41 AM8:52:41 AM8:57:41 AM9:02:41 AM9:07:41 AM9:12:41 AM9:17:41 AM9:22:41 AM9:27:41 AM9:32:41 AM9:37:41 AM9:42:41 AM9:47:41 AM9:52:41 AM9:57:41 AM10:02:41 AM10:07:41 AM10:12:41 AM10:17:41 AM10:22:41 AM10:27:41 AM10:32:41 AMTime (H/M/S)

Voltage (V)

Pressure and Altitude

y = 1070.1e -4E-05x

R2 = 0.9989

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Altitude (feet)

Pressure (millibars)

Alt V. Pressure

Expon. (Alt V. Pressure)

Barometric Pressure Vs. Voltage

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7:25:477:29:477:33:477:37:477:41:477:45:477:49:477:53:477:57:478:01:478:05:478:09:478:13:478:17:478:21:478:25:478:29:478:33:478:37:478:41:478:45:478:49:478:53:478:57:479:01:479:05:479:09:479:13:479:17:479:21:479:25:479:29:479:33:479:37:479:41:479:45:479:49:479:53:479:57:4710:01:4710:05:4710:09:4710:13:4710:17:4710:21:4710:25:4710:29:4710:33:47

Time

Pressure (millibars)

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Average Voltage

Barometric PressureVoltage

Data Conclusions

•Definite Correlation, but not linear as expected.

•More trials (launches) are needed to reach more specific conclusions.

-Data could be inaccurate due to equalization lag

-Need accurate pressure sensor

•Sources of error

-Equalization lag

-Pressure sensor accuracy

Altitude and pressure

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7:25:477:31:177:36:477:42:177:47:477:53:177:58:478:04:178:09:478:15:178:20:478:26:178:31:478:37:178:42:478:48:178:53:478:59:179:04:479:10:179:15:479:21:179:26:479:32:179:37:479:43:179:48:479:54:179:59:4710:05:1710:10:4710:16:1710:21:4710:27:1710:32:47Time

Altitude

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Pressure (millibars)

Altitude

Pressure

Ascent

y = 2E-09x3 - 4E-06x2 + 0.003x - 0.1867

R2 = 0.934

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Pressure

Voltage

Flight Statistics

•Max ascent rate: 1501.313 ft/min

•Max descent rate: 9944.23 ft/min

•Launch: 7:28:47 11/11/2006

•Landing: 9:54:17 11/11/2006

•Max altitude: 98832.02 ft at 9:23:17

Ready To Fly Again

Final preflight too complicated

-Camera power on main switch

-Resolve film issues

Camera failure due to battery enclosure

-Fixed battery enclosure

-Could switch timer relay to DPST

Low peak voltage at sensor

-Modified sound tube

Sound Experiment

Experiment As Flown Modified Experiment

Round Two Pre-Flight

Store the payload,closed, in a cool, dry place

•Replace Consumables

-Modify IR film canister

-Clean IR filter

•Activation

-Power on cameras

-Set flash

-Activate timing circuit

Conclusions

• The correlation between sound transmission and pressure could be linear, but additional flights are needed for surety.

• Given the data, sound does not conduct as well at higher altitudes compared to lower altitudes.

Lessons Learned

All parts of the craft need equal attention

Activation should not require the craft to be open

Tape is ineffective in near-space

Message To Next Semester

Don’t be afraid to ask for help

Take your problems one at a time

Keep your experiment simple, but try something challenging

Test thoroughly

Leave plenty of time for problems