Tetsuyuki Michiyama

Blood-Sugar Monitoring by Reflection of Millimeter Wave

Diabetes mellitus has now emerged as a serious public health problem in Asia. To control blood glucose level, blood-sugar monitoring is necessary. Nevertheless non-invasive blood-sugar monitoring technique has not been in practical use. Complex permittivity of blood is very sensitive to the glucose concentration in microwaves. In this paper, a new technique is proposed to obtain blood glucose level using a resonant applicator non-invasively. It is found from in vivo measurement of reflection coefficient using the resonant applicator, blood glucose level can be obtained by measuring the value of reflection coefficient at the resonant frequency.

Non-invasive measurement of blood-sugar level by reflection of millimeter-waves

The complex permittivity of blood is changed by the change of glucose concentration in millimeter-waves. In this paper, a new technique is proposed to obtain blood glucose level using resonant applicator and measuring reflection coefficient. It is found that by measuring the reflection change using newly developed high sensitivity applicator, blood glucose level can be obtained in vivo.

Obliquely cut open ended coaxial probe for obtaining complex permittivity of lossy materials

In microwave frequencies, the usual technique to measure the complex permittivity of high lossy material as human tissue is to use the open ended coaxial probe. In this paper, to carry reliable contact between the open end and the measuring sample, obliquely cut open ended coaxial probe has been developed. The result of measurement for sample is compared with those obtained from Debye equation. From the results, it is found that by the obliquely cut open coaxial probe, the complex permittivity of ethanol with the purity of 99.5% can be measured. In addition, the electric field distribution is simulated to confirm the area of measurement. By this measuring system, it can be measured for deep point in the material and biological body.