Team Tesla . Anthony Thompson Philip de la Vergne Aaron Wascom Brandon Sciortino. Address concerns from previous PDR presentation Polarity Humidity Temperature Linear Actuator Breakdown Voltage at Sea Level Data Accuracy Data Frequency Requirements System Design Traceability
Philip de la Vergne
Acomparison of breakdown voltages for positive and negative corona
Effect of absolute humidity on the breakdown voltage of a 30cm point-to-plane spark gap
Positive D.C Voltage
Lower temperatures mean slower molecules, which means that the particles in the air collide with less kinetic energy.
This drop in energy apprehends the production of ions and free electrons, which decrease the current created through the corona breakdown mechanism
If the payload passes through a cloud the humidity will change rapidly making Its effect on the breakdown voltage more evident.
The Smallest cloud () is about 1000 ft. tall so it insure we get a measurement inside the cloud we will measure no less than every 500 feet
We ascend 1000 ft. per min and want to sample every 500 ft. so we will measure every 30 second's .
A actuator will increase the distance across the spark gap to prevent a breakdown and the distance at that instant will be recorded.
An analysis of the expected results of this method reveals that it is not plausible.
The linear actuator would have to change the spark gap 19 mm every 500 ft.
Assuming a constant voltage of 3000 V, the sea level pressure distance product on the x-axis of Paschen’s curve is 3 Torr-in. This requires a gap distance of 1.002 mm the gap distance would have to change by 19 micrometers everyLinear Actuator
The payload shall have a temperature sensor that can measure from 40 °C to -70° C and operate throughout the flight.
Measure pressure, temperature, humidity, breakdown voltage, and current across the spark gap
Sensors: Piezoelectric, thermistor, relative humidity
Exposed to environmental conditions
Voltage across spark gap increased until 10 microamps are measured
Voltage comparator observes corona discharge
Switch opened, data recorded, voltage set to zeroPrinciple of Operation
To study the effects of humidity and temperature on the corona breakdown of the atmosphere in an effort to prevent sparking and ensure safety on future payloads.Mission Goal
Observe the effect of temperature on corona breakdown voltage of the atmosphere
Humidity has an effect on the corona breakdown voltage by rearranging the polar water molecules entering the electric field.Effects of Humidity
Temperature has an effect on the corona breakdown voltage through increasing the kinetic energy of the molecules within the spark gap.Effects of Temperature
The electrodes shall be exposed to external temperature and humidity conditions.
The payload shall have a temperature, pressure, and humidity sensor that can measure and operate throughout the flight.
AAA Energizer L92: Lithium vs. Alkaline
Temperature: 1 byte
Humidity : 1 byte
Pressure : 1 byte
Time : 3 bytes
Voltage : 2 byte
Voltage Redundancy: 2 byte
Current : 1 byte
Current Redundancy :1 byte
Radio : 1 bit
Total : 97 bits