Invisible World
of Aroma.
Visualized.

Aroma Bit's sensor is a type of sensor called e-Nose, which imitates the mechanism of human and animal noses. It is a multi-array sensor consisting of many sensor elements, each of which is coated with a different "smell adsorption film" developed by our company.
Each of these smell adsorption membranes has different surface adsorption characteristics, enabing the sensor to detect and numerically analyze smell samples, which is a complex mixture of many unspecified chemical gas substances, as a specific response pattern.
It is generally known that the response patterns of similar smells are similar, and thus makes it possible, to create and develop a digital database library of smells to identify and discriminate one smell from the other.

Two types of sensor transducers, the QCM (Quartz Crystal Microbalance) type and the CMOS (Complementary Metal-Oxide-Semiconductor) type, have been commercialized as sensor elements for detecting the information that chemical substances are adsorbed on the sensor surface.
The QCM type detects changes in mass caused by the adsorption/desorption of smell molecules on the membrane surface as changes in the resonance frequency of the quartz crystal. The frequency change value for each membrane is measured.
The CMOS type is smaller than the QCM type and has a different detection principle. It detects changes in the amount of electric charge on the surface of the sensor. By applying the ability of the CMOS sensor itself to store electric charge on its surface, the change in the amount of charge caused by the adsorption/desorption of smell molecules on the membrane is converted as numerical output data.
(*CMOS type is available from Aroma Bit Inc's subsidiary, Aroma Bit Silicon Sensor Technology, Inc. or ABSST)
Unlike conventional gas sensors, Aroma Bit's smell sensors can detect complex smell, and both 5Q-SSM (QCM) and 5C-SSM (CMOS) can be used repeatedly, for a variety of smell related applications.