Wiktionary
n. 1 A device used to measure the acuity of a person's sense of smell. 2 A device used to measure odour intensity, and concentrations of volatile organic compounds, by means of their smell.
Wikipedia
An olfactometer is an instrument used to detect and measure odor dilution. Olfactometers are used in conjunction with human subjects in laboratory settings, most often in market research, to quantify and qualify human olfaction. Olfactometers are used to gauge the odor detection threshold of substances. To measure intensity, olfactometers introduce an odorous gas as a baseline against which other odors are compared.
Many scientists use the term "olfactometer" to refer to a device used to study insect behavior in presence of an olfactory stimulus. It consists of a tube with a bifurcation (with "T" or "Y" shape) where an insect walks and decides between two choices, usually clean air versus air carrying an odor. This is why this device is also called dual choice olfactometer.
Alternatively, an olfactometer is a device used for producing aromas in a precise and controlled manner.
Usage examples of "olfactometer".
With its sensors and terminals it learned perhaps the most about its charges while they slept, from the rhythm of their breathing, their rapid eye movements, even the chemical composition of their sweat—because each man sweats in a unique way, and the finest bloodhound is no match for the olfactometer of such a computer.
Only now did he realize how hard it would be without an olfactometer, which could have helped him find human traces.