A Microwave Doppler Radar System for Noncontact Measurement of Head and Finger Movements in Clinical Use

Ikuo ARAI  Kazuma MOTOMURA  Tsutomu SUZUKI  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.10   pp.1318-1324
Publication Date: 1993/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Radar Technology)
Category: Radar Applications to Industrial World
microwave Doppler sensor,  displacement meter,  Doppler frequency,  measurement for biological movement,  

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A method to measure the displacement from the phase rotation of the Doppler signal including the displacement information of the moving body is proposed, where the displacement resolution can be improved 4 times by making the phase rotation faster. Furthermore, this test system is applied in clinical use. The test system is built up by using a two-phase microwave Doppler sensor covering a 10GHz band, where the Doppler frequency is multiplied 4 times by signal processing. Thus, the resolution is improved from a conventional 12.6mm (in case of 11.9GHz) to 3.15mm, and practical utilization has been attained. The microwave Doppler radar system described in this paper is adequate for the displacement measurement for a relatively fast moving body. As a medical sensor for clinical use, measurement examples of head movement in a vestibule examination (vestibule oculomotor reflexive inspection) and finger movement in a cerebellum function test are given. Furthermore by using two sets of this Doppler radar system, a 2-dimensional measurement of head movement is possible.