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バイオセンサーの精度とその応用の可能性を探るため２０００年９月に仙台市に研究所を設立しました。研究所所長の吉田哲男は長年の圧電素子の経験を生かし、多機能なシステムの開発研究にまい進してまいります。その結果、特に医療分野に対応するためのセンサー素子の小型化や新しい振動機能などへの期待ができます。連絡先については、問い合わせをクリックしてください。

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December 1998, Volume 42, No. 12, p. 5

Axiom Company of Fukushima has developed a biosensor, dubbed Venustron, for objective measurement of the elasticity of skin and muscle, among others, through the utilization of tactile sensor technology.

In use, the Venustron is linked to a personal computer. Monitoring takes place when the unit's sensor tip is applied to the test spot and vertically vibrated in 0.025 mm steps by a special motor. The stick-type sensor is made of piezoelectric ceramics covered with aluminum.

Elasticity is measured in terms of vibrational frequency, which is related to the strength of the force applied. The Axiom Biosensor is also able to accurately and objectively measure softness/hardness, a quality that has customarily been monitored subjectively with the finger.

Principle of Axiom Biosensor

The measurement procedure is simple, virtually replicating the action of the human finger. All that is required is to press the Biosensor to the object to be measured. Results are then displayed on a real-time basis.

The range of measurement is wide, from very soft items such as silicone rubber to hard items like steel plate.

Since the Axiom Biosensor monitors differences in acoustic impedance to determine the elasticity of an object, it is subject to very few restrictions.

In theory, it is possible to measure any substance or object that can be felt by human touch. The new Venustron was specifically developed to monitor the subtle effects of cosmetics on human skin and muscle, which have been very difficult, if not impossible, to determine.

The listed measurement values were obtained by pressing the Axiom Biosensor to the object for two seconds. The numerical values show changes in vibrational frequency, which attenuates for soft objects and increases for hard objects.

Table: Values measured by the Axiom Biosensor

The tactile sensor unit of the newly developed Venustron is driven by a motor to a designated depth; it then reverses and returns to the start position.

The sensor measures not only the softness/hardness of objects but also their elasticity, both at the same time.

Results are displayed in four types of graph: (1) Time series graph of tactile sense, pressure, and displacement (2) Hysteretic graph of pressure and displacement (3) Hysteretic graph of tactile sense and displacement (4) Hysteretic graph of tactile sense and pressure.

The tactile sensor system of the Venustron comprises the following units.

(1) Probe: The probe incorporates a tactile sensor, pressure sensor, and displacement sensor. The tactile sensor is mounted on the tactile sensor unit, and the pressure sensor and motor mechanism are mounted at the rear.

(2) Control unit: The control unit supplies power to each sensor in the probe, and outputs signals from each sensor through the feedback circuit of the tactile sensor and interface circuits.

(3) Measurement software: The software displays signals input to the computer in graph form. Software differs according to the type of sensor.

(4) Computer: DOS-V/Windows95 laptop model. An RS232C interface is used.

(5) Cables: Connect to each unit.

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