A micro-sized gas detecting device with two electrodes separated by a gap
of width ranging from 1 to 500 microns, where the detection is based on
emission spectroscopy of gases in an electric discharge across the gap
(discharge region) as the gas flows through the region. The
characteristic light emitted by molecules during the discharge can be
detected directly with photodiodes or transferred through optical fiber
and detected with remote optical sensing components. The device can have
single or multiple discharge regions in an array so that light emitted
can be monitored at different wavelengths simultaneously. The device can
operate under gaseous pressure ranging from a few milli-Torr to a few
atmospheres. The device consumes little power (50 mW-100 mW) and can be
powered with an alternating current and has the potential to be battery
powered.