RESEARCH-AND-DEVELOPMENT OF ODOR MEASUREMENT USING A SEMICONDUCTOR GAS SENSOR

In the absence of an established olfaction theory, measurement of odor s is conducted using human olfaction. We have developed a new system t o measure and monitor human sensory value using a semiconductor gas se nsor. The system consists of (1) moisture control equipment for measur ing gas and odorless air, and (2) computer software to convert the ads orption amount of the sensor into the human sensory value. The sensor can be calibrated by three methods: (1) by giving the sensor's coeffic ients without using calibration gas; (2) by using calibration gas; and (3) by using the mathematical model with a compensation coefficient u sing calibration gas. We were able to measure the human sensory value with a correlation coefficient of 0.95 to 0.96 for each method.