PROBLEM TO BE SOLVED: To detect the change of the temperature rise with the simple structure, by reversing the electrolysis applied to a pyroelectric body such as the ferroelectrics having the pyroelectric effect, and detecting the change of the spontaneous polarization of the pyroelectric body corresponding to the change of the temperature rise generated by the absorption of the infrared ray, as the change of the electron emission amount emitted from the first electrode toward an electron detecting means. ;SOLUTION: A terminal 8 is earthed, the acceleration voltage Va of positive voltage is applied to a terminal 9, and a pulse generator 10 of a pulse voltage application means, is connected with the terminal 7. The pulse generator 10 generates the pulse voltage for applying AC electric field for the periodic reversal of the polarization of the pyroelectric body 1, between the first electrode 2 and the second electrode 3. An electron multiplier means 5 is formed of a multichannel plate 5 including a number of channel-type secondary electron multipliers, and an electron detecting means 4 forms a platinum collector electrode. The temperature of the pyroelectric body is raised by the incoming radiation of the infrared ray 11, the dielectric constant is changed, and the change of the electron emission amount of the first electrode 2 by the spontaneous polarization action of the pyroelectric body 1, is detected to detect the infrared ray.;COPYRIGHT: (C)1998,JPO
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