| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure a temperature or a temperature distribution of a molten droplet. SOLUTION: A beam emitted from the molten droplet D in the arc welding is separated into two spectral beams by triangular prisms 14, 15 as beam splitters. The first filter 19 and the second filter 20 are arranged in spectral beam emitting sides of the beam splitters to transmit separately the spectral beams of two wavelengthsλ1,λ2 neighoring each other. Brightness of the beam of the wavelengthλ1 transmitted through the first filter is detected by a camera unit 3, and brightness of the beam of the wavewlengthλ2 transmitted through the second filter is detected by another camera unit. The temperature distribution of the droplet is computed and output by a personal computor 5 based on brightness signals of the beams of the wavelengthsλ1,λ2 provided by the two camera units 3, 4.
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