Ferroelectric ceramic/polymer composites were fabricated in the film form hot pressing Calcium modified lead titanate (PTCa) powder and poly(ether-ether-ketone) (PEEK) as polymer matrix. Different ceramic contents such as 40, 50 and 60 volume percent were used and composites films were obtained in the thickness range of 100 to 300ïm. To display pyroelectric activity the samples were poled by appropriated electric field. Using this composite as temperature sensors, a fire alarm was constructed. The alarm turn on when the sensor detects a signal variation corresponding to the frequency oscillation of fire light in the range of 5 Hz to 40Hz. Low density, mechanical resistance and high pyroelectric figure of merit(FOM) are some interesting characteristic of this composite, which allow to state that it can be used in photo-thermal spectroscopy.