225 S. University Street
West Lafayette, IN 47907-2093
Phone: (765) 494-1214
Fax: (765) 496-1115
Odor concentrations are determined using an AC'SCENT International Olfactometer.
Panelists evaluate intensity and Hedonic tone
Intensity is measured on a scale of 0 to 5 where 0 has no perceivable odor and 5 has an extremely strong odor. Intensity levels are determined by comparing to a reference odorant, n-butanol.
Hedonic tone is the pleasantness or unpleasantness of an odor. The scale ranges from -10, extremely unpleasant through +10, extremely pleasant.
Eight trained panelists are used to evaluate each odor sample. The panelists are required to follow strict rules in order to have their senses in top form. The panelists are screened following the European Standard (CEN 9805) and using the calibration odorant n-butanol to ensure that no panelists are anosmic (lacking a sensitivity to odor) or hypersensitive.
The buoyant and convective flux chamber is used to measure and to collect odor and gas emissions from lagoons and other liquid surfaces.
Analyzers from Thermo Fisher Corporation (TFC), Innova AirTech Instruments (INNOVA), California Analytical Instruments, Thermo Electron, and additional companies are used to measure:
The results from the analyzers are fed into a real time on screen computer display.
The environmentally controlled room can be prepared with up to forty 143-L ventilated experiments. The set-up readily allowed bag sampling for odor, trap sampling for gas chromatography, and continuous emissions monitoring from the adjacent room.