Design of Pure Capacitance Phonocardiogram Sensor Based on Phantom Power Supply
- VernacularTitle:基于幻象电源供电的纯电容心音传感器的设计
- Author:
Guodong ZHENG
;
Wei HE
;
Yang JIANG
- Publication Type:Journal Article
- Keywords:
heart sound;
pure capacitance sensor;
phantom power
- From:
Chinese Medical Equipment Journal
1989;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To research a pure capacitance sensor for acquisition of cardiac phonocardiogram. Methods Under the phantom power supply (48V), the faint vibration signal of the heart was processed into electric signal by larger pre - treatment circuit module, shielded cable and the sensor pre-amplifier of circuit module. Results With some experiments, it can be proved that the sensor won't have affect on the sound field which frequency band under 1 000Hz and can detect the level of sound field like 20dB:30dB and 150dB or higher. Conclusion So with the sensor, the precise signal which can exactly reflect the status of patients' hearts can be detected, and it suits to work in complex condition for its high sensitivity, wide frequency band and low distortion.
