Ultrasensitive portable nitrogen dioxide monitor
School Name
Spring Valley High School
Grade Level
12th Grade
Presentation Topic
Physics
Presentation Type
Mentored
Written Paper Award
2nd Place
Abstract
The purpose of this experiment was to create a diode laser that could detect concentrations of NO2 both faster and more accurately than chemiluminescence. NO2 is a harmful greenhouse gas that leads to the formation of ozone. It was hypothesized for the first experiment that if the amount of NO2 in the cavity is increased, then the signal picked up by the detector will go down.The NO2 was inserted into a cavity at set amounts and measurements were taken using the diode laser. Measurements were taken every 0.5s for 50s and averaged. The sensitivity was then calculated by placing the averaged points for varying concentrations of NO2. The linear relationship between the integrated signal and NO2 concentrations was very strong for each test with R2 values over 0.99. It was hypothesized for the second experiment that if the integration time nears 10s, then the accuracy of the laser will increase. Zero air was run through the cavity and measurements were taken for 10 minutes at varying integrations times. The data was then assembled into an alan chart and a 10 second integration time was concluded to be the most effective.
Recommended Citation
Gottipaty, Nikhil, "Ultrasensitive portable nitrogen dioxide monitor" (2018). South Carolina Junior Academy of Science. 183.
https://scholarexchange.furman.edu/scjas/2018/all/183
Location
Neville 306
Start Date
4-14-2018 11:30 AM
Presentation Format
Oral and Written
Ultrasensitive portable nitrogen dioxide monitor
Neville 306
The purpose of this experiment was to create a diode laser that could detect concentrations of NO2 both faster and more accurately than chemiluminescence. NO2 is a harmful greenhouse gas that leads to the formation of ozone. It was hypothesized for the first experiment that if the amount of NO2 in the cavity is increased, then the signal picked up by the detector will go down.The NO2 was inserted into a cavity at set amounts and measurements were taken using the diode laser. Measurements were taken every 0.5s for 50s and averaged. The sensitivity was then calculated by placing the averaged points for varying concentrations of NO2. The linear relationship between the integrated signal and NO2 concentrations was very strong for each test with R2 values over 0.99. It was hypothesized for the second experiment that if the integration time nears 10s, then the accuracy of the laser will increase. Zero air was run through the cavity and measurements were taken for 10 minutes at varying integrations times. The data was then assembled into an alan chart and a 10 second integration time was concluded to be the most effective.
