Tuesday, April 3, 2012

Dry Ice Cooler Test Report

38 minutes of pictures in the cooler before the batteries died in the camera; however, it was taking pictures before that as well (45+), we may have to modify the voltage source which we can look into on Tuesday.  Also the separation of the pictures will have to be looked at, I feel like the triggering was somewhat inconsistent from looking at the time stamps.

After 38 minutes in the box the temp sensor was reporting -6 to -7 degrees Celsius, but it dropped further down to a recorded -14. The flight computer was in the cooler for 96 minutes without a write failure.

The order of data:
Time Stamp | Temp Sensor | Pressure <atm> | Pressure <Pa> | Temp (from Pressure Sensor) | Altitude (meters) | Acc. X (m/s^2) | Acc. Y | Acc. Z

Humidity was causing a lock up, so it was neglected for this run.

Note the data logger was left on for a few minutes after removing it from the cooler.  The end measurements of for acceleration skewed slightly (~1 m/s^2) but we did move it from the cooler.  The flag here.... is the flight computer was set on the desk and allowed to record for a couple minutes...under no x/y acceleration alterations, although you can see when we grabbed it from the cooler.  It seems like when it warms back up from being cold the readings are slightly off, but then again we didn't allow it to fully warm back up.  Also compare the two temperature sensors, the pressure sensors temperature reading is less responsive than the temperature sensor.  Keep in mind we have pressure readings calculated from the pressure sensors temperature reading, done bit wise, making for an annoying conversion.

-Brett Russell

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