PACERFlight Readiness Review (FRR)

for theGrambling Ozone Detector

(G. O. D.)

Cassandra Hendon, Derrien Green, Cassandra Hendon, Derrien Green, Demetrius NormanDemetrius Norman

Science Background The payload will ascend through the troposphere, the tropopause,

and into the stratosphere to the upper boundary of the ozone maximum.

This figure represents a typical ozone profile of atmospheric ozone. However, the specific profile depends on location, particularly the latitude. There is also a seasonal variation with the tropopause at higher altitudes at latitudes smaller than 60°.

The G. O. D. will measure the profile over East Central Texas (35° latitude) in late Spring.

Science Background (continued) Ozone acts as a shield against the harmful Ultraviolet

Radiation from the Sun. Stratospheric ozone makes up about 90% of the ozone within the

Earth’s atmosphere. . Ozone is destroyed when it reacts with substances such as nitrogen,

hydrogen chlorine, or bromine. The destruction of Ozone occurs naturally as these gases also coexist

in our atmosphere; however, studies suggest that humans are a major contributor to the increase in destruction of ozone gas.

Science Requirements

Report ozone concentration in parts/billion (ppb) for Report ozone concentration in parts/billion (ppb) for altitudes 0 ≤ altitudes 0 ≤ hh ≤ 30 km ≤ 30 km

Calculate density within 5% uncertainty which includes:Calculate density within 5% uncertainty which includes: Measure temperature to within 1 °C (0.5% at the

tropopause). Measure pressure to which 1 mbar (5% at the

tropopause). Make measurements every 15 seconds.Make measurements every 15 seconds. the altitude to within 100 meters.

Technical Requirements Payload must remain intact from launch to recovery.Payload must remain intact from launch to recovery. Power system must operate over the temperature range -80 °C ≤ Power system must operate over the temperature range -80 °C ≤ TT ≤ 40 ≤ 40

°C with the capacity to power the BalloonSat, sensors, and data archive °C with the capacity to power the BalloonSat, sensors, and data archive for the duration of the flight.for the duration of the flight.

Temperature sensor able to measure over the range -80 °C ≤ Temperature sensor able to measure over the range -80 °C ≤ TT ≤ 40 °C. ≤ 40 °C. Pressure sensor able to measure over the range 5 mbar ≤ Pressure sensor able to measure over the range 5 mbar ≤ PP ≤ 1000 mbar. ≤ 1000 mbar. Record time to 15 second accuracy.Record time to 15 second accuracy. Data archive system with the capacity to store measurements by the Data archive system with the capacity to store measurements by the

sensors and real time clock for the duration of the flight (approximately sensors and real time clock for the duration of the flight (approximately 750 data records)750 data records)

Ground system which can download, analyze, and graphically display Ground system which can download, analyze, and graphically display payload measurements.payload measurements.

MQ-131 Ozone SensorInexpensive sensor that measures ozone concentration by measuring the electrical resistance of heated air sample. Heater operates at 6V.Sensor probe operate at 5V.Nominal electrical resistance is 100k-200k. However, we measured the resistance to be 33k.Resistance increases with ozone concentration.The sensor circuit is an ohmmeter.Here is where we got stuck.

Manufacturers Calibration MQ-131

Power Budget

ComponentComponent Voltage (V)Voltage (V) Current (mA)Current (mA) Power (mW)Power (mW) Duty Cycle (%)Duty Cycle (%)

BalloonSatBalloonSat

SubsystemSubsystem

8–128–12 6060 720720 100100

Data ArchiveData Archive On BalloonSatOn BalloonSat On BalloonSatOn BalloonSat On BalloonSatOn BalloonSat 100100

Temperature Temperature SensorsSensors

8–128–12 88 9696 100100

Pressure SensorPressure Sensor 8–128–12 5 5 6060 100100

Ozone SensorOzone Sensor 66 500500 30003000 100100

Acknowledgements

PACERPACER NASA/CIPAIRNASA/CIPAIR LaSPACE, the Louisiana Space Grant ConsortiumLaSPACE, the Louisiana Space Grant Consortium National Science FoundationNational Science Foundation NASA Columbia Scientific Balloon FacilityNASA Columbia Scientific Balloon Facility Louisiana State University-Baton RougeLouisiana State University-Baton Rouge