Airborne Doppler transceiver designs for external urodynamics study with drip proof aperture; comparison in between airborne ultrasound and millimeter wave Doppler systems

摘要

We devised K-band (24GHz, 12.5mm) microwave and 40KHz (8mm) airborne ultrasound CW-Doppler systems to monitor and measure variety of moving target investigation in biomedical research fields. The major application, but not limited to, is measurement of urea flow running in air (external urodynamics study). The Doppler method makes an alternative new method for unconstrained, natural urodynamics study for urology. Other than urodynamics study the devices can take up interesting Doppler signals from human and small animal and natural phenomena activities such as body and limb movements, aspiration/respiration air jet, running water droplets including rain, and bicycle to ground speed, etc. Both of the devices are wearable, finger-mount style. Observation of Doppler spectrum of running urea gives diagnostic information almost compatible to conventional mess-cup type uroflow meter/recorder. Here microwave and ultrasound systems are application compatible including signal processing and measurement, except very specific case dependent to physics of each method. Unlike our old days study (3) where Gunn diode oscillator based microwave Doppler unit was so expensive and power consuming, today, they are easily devised by single transistor oscillator single diode detector, with comparable cost, size and power requirements. Some of selected Doppler signals and their analyses, out from biological activities of human and small animals will be shown.