A device for measuring skin resistance designed for emotional measurement

Skin resistance is one of the important indexes in psychological affective researches, and it can reflect the change of emotion by recording its changes. Generally, the skin resistance measurement method is connecting the electrode sensor to the two adjacent fingers of the object to record the resistance signal, and then amplifying, collecting and recording the signal by amplification circuit. However, the study found that in the actual measurement process, the skin resistance can produce non-emotional impact changes caused by the signal acquisition error and temperature fluctuation factors; thereby the actual measurement results can be interfered. This study improved the selection of sensor module and the amplification circuits to deal with this problem. As for the acquisition of signal, this study adopts the pet polyethylene glycol ester containing activated carbon as the electrode sensor material and selects the palm area as the signal collecting site; as for the amplification circuit, the differential amplification circuit which can restrain the drift effectively was chosen to realize the amplification signal function. The comparison experiment shows that the improved acquisition sensor module and differential amplification circuit can effectively improve the anti-interference ability of the skin resistance measuring device. Finally, this study proves that the experimental device can effectively measure the emotional changes of the object by using the experiment of fear and happy emotional stimuli.