Pyroelectric Thin Film Calorimeter
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
A pyroelectric thin film calorimeter is made as follows: A thin pyroelectric polymeric material serves as the active element. With its low heat capacity and mass density a minute amount of heat is sufficient to induce substantial temperature increase. Via the pyroelectric effect, this temperature increase induces electrical charges in the metal electrodes on both sides of the polymer film. Using a polymer like PVF2, this signal is large due to the high pyroelectric coefficient. With its small dielectric constant, this causes a large change of voltage at the device. Using a 6 mm PVF2 film, up to 100 V are observed for a 1 J energy input. A circular piece of the polymer film is stretched on a metallic supporting ring. A second retaining ring is slipped over the polymer membrane.