The invention belongs to the technical field of material
thermal conductivity measurement and discloses a
harmonic method based hydrogel
thermal conductivity testing device. The
hydrogen thermal conductivity testing device comprises a
detector, a precision resistance box, a
signal generator,
voltage followers and a phase-locking
amplifier; the
detector comprises a container, a support plate, an
electrode and
metal heating wires, the support plate is placed at the top of the container, the
electrode is installed on the support plate and includes multiple
copper bars, and lower ends of the
copper bars are connected through the
metal heating wires; the
copper bar a is connected with the
signal generator, both the copper bar b and the copper bar c are connected with the first
voltage follower,the copper bar d is connected with the precision resistance box, the precision resistance box is connected with the second
voltage follower and the
signal generator, and the first voltage follower and the second voltage follower are connected with the phase-locking
amplifier. By the arrangement, thermal
conductivity of hydrogel can be measured through the
harmonic method accurately and conveniently.