G - Physics – 01 – F
Patent
G - Physics
01
F
181/18, 349/38,
G01F 23/28 (2006.01) G01B 17/02 (2006.01) G01F 23/296 (2006.01)
Patent
CA 1070008
ABSTRACT OF THE DISCLOSURE An acoustic tube having several resonant frequencies is directed into the mouth of a refining crucible and is heated to above 100°C. A microphone at the remote end of this tube receives sound passing through the tube and generates an electri- cal output corresponding to the sound received. This electrical output is linearized over a band width including several of the resonant frequencies of the tube and the signal is then passed through a low pass filter to eliminate parasitic oscillations and through a mixer where it is combined with a signal from a local oscillator. The intermediate-frequency signal thus produced is passed through either of a pair of band-pass filters and is dis- played. The signal strength at the output is inversely propor- tional to the depth of slag in the crucible, as the deeper the slag the more sound is absorbed in the crucible.
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