| 摘要 |
PURPOSE:To permit selective transmission of infrared rays in a wavelength region radiated by flame by forming, a film in which glass frit and BaTiO3 are dispersed uniformly in polyamide. CONSTITUTION:Film is formed from glass frit (A) and BaTiO3 (B) dispersed unoformly in polyamide (C). Glass frit having low melting point which transmit infrared rays n 3.3-5.7 micron band selectively is desirable as the component A, and Nylon 6 which transmits infrared rays in 3.6-5.9 micron band is desirable as the component C. When a mixture of the above described three components in an appropriate compositional ratio (e.g. 30-55wt% A, 3-10wt% B, residual wt% C) is formed into a film, a flexible filter is obtd. Since the obtd. Filter selectively transmits infrared rays in a wavelength band including 4.3 micron wavelength radiated from flame, the filter is usable as a material for a flame sensor.
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