Patent ID: 7238328

Claim:
A photolytic NO 2 converter for converting NO 2 present in a gas sample into NO, comprising: a body including a reaction chamber that possesses diffuse reflective properties located substantially within said body, said reaction chamber possessing at least one aperture, said reaction chamber being highly reflective, having a reflective efficiency of at least 0.95 for light in the ultraviolet wavelength range; a reaction chamber inlet in communication with said reaction chamber for transporting a gas sample into said reaction chamber; a reaction chamber outlet in communication with said reaction chamber for transmitting a processed gas sample out of said reaction chamber; and at least one low-power light-emitting diode (LED) configured to produce UV wavelength radiation in the range of 350–420 nm optimally situated at the overlap of high NO 2 adsorption and quantum yield located substantially adjacent to said at least one aperture to enable UV wavelength radiation to pass from said at least one low-power LED into said reaction chamber through said at least one aperture, for converting NO 2 present in a gas sample transported into said reaction chamber by said reaction chamber inlet into NO in a processed gas sample for transportation out of said reaction chamber by said reaction chamber outlet, said reaction chamber having a volume for providing a residence time of said processed gas sample in said reaction chamber of less than 5 seconds.