| 摘要 |
1,226,668. Electroluminescence. THOMSONCSF. 20 May, 1968 [23 May, 1967], No. 24004/68. Heading C4S. An infra-red converter comprises ferroelectric strip 1 (BaTiO 3 for instance), means for directing infra-red radiation on to same and for creating an A.C. field and means for maintaining the temperature near the Curie temperature. The system may be maintained at a temperature lower than the Curie temperature by a thermostatic system utilizing variations in capacitance of the electrode 2, 3 and strip 1 combination, regulating device 11 being parallel with resistor 6, and heating resistors 9 and 10. Capacitor impedance is adjusted by D.C. source 5. In Fig. 6 (not shown), the strip is included in a tube with transparent liquid (112), and closed by transparent windows (111) and (110) (e.g. of Ge). Wall (104) may be glass or mica. Positive or negative images may be obtained and for A.C. frequencies between 10 kc./s. and 100 Mc/s. the luminous intensity is a maximum at. the Curie temperature (Fig. 1, not shown) while between a few c/s. and 10 kc./s., luminescence is zero at the Curie temperature and above, but an increasing function with decreasing temperature below (Fig. 4, not shown). |
