The heat contact is designed as a copper disc of 10 mm diameter with pin hole for soldering of the
constantan wire. This huge contact offers more accuracy to the heat flux measurement using the backhand
of the glove. Because grounding would increase the reaction time, both bimetallic paths are directly
connected to a differential amplifier. The amplified and noise reduced signal is then digitalized using an
internal Analog Digital converter inside the microprocessor (AD1). In addition the signal is amplified
again while using a fixed voltage threshold (AD2). This second amplification is necessary to measure
small heat differences through several textile layers. The circuit is shown in fig. 2 (a).