Research and Development of Odor Measurement Using a Semiconductor Gas Sensor

Area of Science:

• Sensory Science
• Analytical Chemistry
• Biotechnology

Background:

• Human olfaction is currently the standard for odor measurement due to the absence of a comprehensive olfaction theory.
• Objective and standardized methods for quantifying odor perception are crucial for various scientific and industrial applications.

Purpose of the Study:

• To develop and validate a new system for measuring and monitoring human sensory value of odors using semiconductor gas sensors.
• To establish a reliable method for odor quantification that complements or replaces subjective human olfaction assessments.

Main Methods:

• Development of a system integrating moisture control equipment and computer software for odor measurement.
• Utilizing a semiconductor gas sensor to detect and quantify airborne compounds.
• Calibration of the sensor using three distinct methods: sensor coefficients, calibration gas, and a mathematical model with compensation.

Main Results:

• The developed system successfully converted semiconductor gas sensor adsorption data into human sensory values.
• High correlation coefficients (0.95–0.96) were achieved for all three calibration methods, demonstrating robust measurement capabilities.
• The system proved effective in measuring human sensory value under controlled conditions.

Conclusions:

• The novel semiconductor gas sensor system provides a reliable and accurate method for measuring human sensory value of odors.
• This technology offers a promising alternative for objective odor assessment, advancing the field of sensory science.
• Further research can explore the application of this system in diverse environments and for a wider range of odorants.