A chemical sensing system has: an interrogation unit operable to wirelessly transmit
an interrogation signal and wirelessly receive a response; an environmentally sealed
container for holding a chemical analyte; a sensor array unit in fluid communication
with the analyte disposed within the container, where the sensor array unit is
operable to generate a response in the presence of a chemical stimulus; and a passive
responder unit connected with the sensor array unit, the responder unit being powered
from the interrogation signal, where the responder unit is operable to wirelessly
receive the interrogation signal and wirelessly transmit the response to the interrogation
signal to the interrogation unit.