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在很多短程生物遥测中,往往要求远距单元可长时间工作。根据此要求,作者介绍了一种新颖的无源生物遥测技术.其具体方法为由生物电信号以键控方式调制一个可工作在两个不同谐振频率点上的LC 无源回路,由于其中有一个正好与主机单元发射的高频信号频率相同,从主机单元发射的该频率的信号能量间歇地被此 LC 无源回路吸收.在主机单元,以两线圈回路反射等效阻抗检测此 LC 无源回路的谐振状态,通过 FM 解调可重建原生物电信号.由于远距单元只以开关形式改变 LC 无源回路的谐振频率,而不发射电磁波,所以远距单元只有放大器消耗很少的能量,电池可长时间工作.可遥测的范围与主机单元发射功率有关,而与远距单元
In many short-range biological telemetry, long-distance units are often required to work long hours. According to this requirement, the author introduces a novel passive bio-telemetry technology, which specifically uses a bioelectrical signal to key-modulate an LC passive loop that can work at two different resonant frequency points. Since there are The frequency of the signal emitted by the master unit at this frequency is intermittently absorbed by the LC passive circuit at the same frequency as the high frequency signal transmitted by the master unit, The resonant state of the loop can be reconstructed by the FM demodulation of the original bio-electrical signals.As the remote unit to switch the resonant frequency of the LC passive loop only switch form, but not the electromagnetic waves, so the remote unit only the amplifier consumes very little energy, The battery can work for a long time.The range of telemetry with the host unit transmit power, but with the remote unit