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Olfaction

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...

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Related Experiment Video

Updated: Aug 5, 2025

Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing

Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing

Published on: January 28, 2021

Repetitive Direct Comparison Method for Odor Sensing.

Gaku Imamura^1,2, Kosuke Minami³, Genki Yoshikawa^3,4

¹International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan.

|March 29, 2023

Summary

This summary is machine-generated.

A new repetitive direct comparison (rDC) method enhances olfactory sensor performance. This technique improves signal-to-noise ratios for detecting specific odors, even with interfering gases present.

Keywords:

gas sensor membrane-type surface stress sensor olfactory sensor signal processing

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Last Updated: Aug 5, 2025

Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing

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Area of Science:

Chemical Sensors
Analytical Chemistry
Materials Science

Background:

Olfactory sensors are crucial for gas sensing applications.
Interfering gases often mask target odor signals in complex mixtures.
Extracting faint odor responses from dominant interfering gases is essential for practical use.

Purpose of the Study:

To develop a method for enhancing the detection of specific odors amidst interfering gases.
To improve the signal-to-noise ratio (S/N) in olfactory sensor measurements.
To validate the proposed method using real-world samples like flavored chocolates.

Main Methods:

Proposed a repetitive direct comparison (rDC) method for gas sensing.
Implemented rDC by alternately injecting two target odors into a sensor system.
Utilized a sensor system based on membrane-type surface stress sensors (MSS) for measurements.

Main Results:

The rDC method demonstrated improved S/N compared to conventional measurement techniques.
Successfully distinguished between the odors of two different chocolate flavors.
Identified potential enhancement of sensing signals with specific MSS receptor materials and target odors.

Conclusions:

The rDC method is a feasible approach for enhancing olfactory sensor performance.
This technique effectively highlights odor differences by minimizing interference.
Further optimization of receptor materials could lead to even greater sensing signal enhancement.