3c5741fc_ving_Charge_Sensor_of_J__Ahern__to_various_charge_conditions__instrument_response
[charge movement] + charge approaching [instrument response] 
RED
R E D
R E D c h a n g i n g t o G R E E N
G R E E N
G R E E N c h a n g i n g t o R E D
R E D a n d G R E E N
n o L E D s l i g h t e d
Moving Charge Sensor of J. Ahern
instrument response