Page 86 - Handbook of Biomechatronics
P. 86
Sensors and Transducers 81
Example EMG
2
1.5
1
0.5
Voltage (mV) 0
–0.5
–1
–1.5
–2
0 2 4 6 8 10 12
Time (s)
Fig. 23 Example electromyographic (EMG).
Fig. 24 Button electrode.
A button electrode (Fig. 24) is an electrode which is placed anywhere on
the skin. The sensing end is attached to the skin with tape or has a surround-
ing stick membrane. The button connects to an EMG amplification and
processing system. When using such a system, two electrodes are paired
to create a voltage differential. One electrode is required to be a reference
to ground the signals. These systems have more flexibility since the
electrodes can be placed anywhere and electrode sets can be self-selected.
However, they require more effort to setup and are often less portable.
