A Composite Heat Sensor

A pyroelectric heat sensor has been developed. The sensing element installed is a composite film in which the particles of modified PbTiO 3 are so dispersed that they can be aligned in a single layer and are bound together by polyamidimid resin. Both the top and bottom portions of the particles are scraped allowing them to come into contact with the electrodes provided on the film. Thus the composite film has the parallel structure. The sensor equipped with the composite film is found to exceed the ceramic one in the responsivity, R v , by a factor of 2. In the case of detecting induced charge, the sensor output increases as the particle content and the area/thickness of the film increase in a wide range. The sensor equipped with the composite film of high particle content and having a large area and a small thickness exceeded the ceramic sensor in output voltage.