Title :
A broad-band time-domain spectroscopy for biological study of electromagnetic absorption
Author :
Baba, Kenzo ; Takagi, Tasuku
Author_Institution :
Dept. of Intelligent Syst. Eng., Ichinoseki Coll. of Technol., Japan
Abstract :
An accurate measurement of broad-band electrical properties of biological substances is inevitable for investigation of electromagnetic hazard problems in connection with EMC. For the purpose of developing the spectroscopy for biological substances we tried to apply the method to measurement of the properties of beef meet. Our prototype system of time domain reflectometry (TDR) is composed of a digitizing oscilloscope mainframe (HP54120B), test unit (HP54121A), transmission line, sample cell and dc-power supply for temperature control. An incident step pulse and a reflected wave from the sample are digitized and transferred to the computer system of the Computer Center of Tohoku University through the personal-computer PC9801 of NEC Co. and analyzed by ACOS. The frequency dependence of complex permittivity and/or complex conductivity is obtained by a simple equation after Laplace transforming the observed waves in time domain. We will represent a transforming technique covering broad band from 30Hz to 1OGHz. As far as we are aware, there are no reports on the computational technique for the transformation covering such a broad band
Keywords :
Laplace transforms; automatic test equipment; biological techniques and instruments; computerised instrumentation; electromagnetic compatibility; electromagnetic wave absorption; health hazards; microwave measurement; microwave reflectometry; permittivity measurement; time-domain reflectometry; 30 Hz to 10 GHz; ACOS.; EMC; HP54120B; HP54121A; TDR; beef meet; biological study; biological substances; broad-band time-domain spectroscopy; complex conductivity; complex permittivity; dc-power supply; digitizing oscilloscope mainframe; electromagnetic absorption; electromagnetic hazard; frequency dependence; incident step pulse; personal-computer PC9801; sample cell; temperature control; time domain reflectometry; transmission line; Electric variables measurement; Electromagnetic compatibility; Electromagnetic measurements; Hazards; Oscilloscopes; Prototypes; Reflectometry; Spectroscopy; Time domain analysis; Transmission line measurements;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1994. IMTC/94. Conference Proceedings. 10th Anniversary. Advanced Technologies in I & M., 1994 IEEE
Conference_Location :
Hamamatsu
Print_ISBN :
0-7803-1880-3
DOI :
10.1109/IMTC.1994.352111
