实验力学
實驗力學
실험역학
JOURNAL OF EXPERIMENTAL MECHANICS
2009年
5期
473-478
,共6页
富东慧%侯振德%秦庆华%卢晨霞
富東慧%侯振德%秦慶華%盧晨霞
부동혜%후진덕%진경화%로신하
骨%压电性%压电电压%压电电荷%相对湿度
骨%壓電性%壓電電壓%壓電電荷%相對濕度
골%압전성%압전전압%압전전하%상대습도
bone%piezoelectricity%piezo-voltage%piezo-charge%relative humidity
对不同相对湿度下的骨压电电压和压电电荷信号进行测量研究,来考察湿度对骨压电信号的影响.采用三点弯曲干骨试样,以梯形脉冲载荷的方式进行加载,分别应用超高输入阻抗的生物信号放大器和电荷放大器测量了三种不同相对湿度下的骨压电电压和压电电荷信号波形.结果表明,骨压电电压峰值随湿度的增加而下降很快,当湿度从30%增至60%时,电压降幅达到了80%左右;基于测试原理的不同,骨压电电荷也随湿度的增加而下降,其降幅较小.由此可以推断,骨在体内湿润的状态下,受力变形时压电电压幅值可能趋于零.电荷的产生和瞬时泄放有可能是骨在体内的动态载荷作用下的压电效应的表现形式.
對不同相對濕度下的骨壓電電壓和壓電電荷信號進行測量研究,來攷察濕度對骨壓電信號的影響.採用三點彎麯榦骨試樣,以梯形脈遲載荷的方式進行加載,分彆應用超高輸入阻抗的生物信號放大器和電荷放大器測量瞭三種不同相對濕度下的骨壓電電壓和壓電電荷信號波形.結果錶明,骨壓電電壓峰值隨濕度的增加而下降很快,噹濕度從30%增至60%時,電壓降幅達到瞭80%左右;基于測試原理的不同,骨壓電電荷也隨濕度的增加而下降,其降幅較小.由此可以推斷,骨在體內濕潤的狀態下,受力變形時壓電電壓幅值可能趨于零.電荷的產生和瞬時洩放有可能是骨在體內的動態載荷作用下的壓電效應的錶現形式.
대불동상대습도하적골압전전압화압전전하신호진행측량연구,래고찰습도대골압전신호적영향.채용삼점만곡간골시양,이제형맥충재하적방식진행가재,분별응용초고수입조항적생물신호방대기화전하방대기측량료삼충불동상대습도하적골압전전압화압전전하신호파형.결과표명,골압전전압봉치수습도적증가이하강흔쾌,당습도종30%증지60%시,전압강폭체도료80%좌우;기우측시원리적불동,골압전전하야수습도적증가이하강,기강폭교소.유차가이추단,골재체내습윤적상태하,수력변형시압전전압폭치가능추우령.전하적산생화순시설방유가능시골재체내적동태재하작용하적압전효응적표현형식.
The piezoelectric effect of bone is related to relative humidity levels. Under trapezoidal pulse loading, piezoelectric signals of dry bone samples three-point bending were measured at different relative humidity levels. Piezo-voltages were obtained by using an ultra high input impedance bioamplifier. For the sake of comparing, piezo-charges of bone were also measured. Results show that piezo-voltage of bone quickly decreases with humidity increasing. Piezo-voltage decreases around 80% along with the relative humidity increases from 30% to 60%. The measured piezo-charge also decreases at lower rate along with humidity increasing due to different test principle. It is concluded that piezo-voltage induced by deformation of bone may be performed in a pulse style under dynamic loads.