Measuring and testing – Vibration – By mechanical waves
Patent
1975-10-29
1978-07-04
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
73290V, G01N 2900, G01F 2328
Patent
active
040981282
ABSTRACT:
An acoustic tube having several resonant frequencies is directed into the mouth of a rafining crucible and is heated to above 100.degree. C. A microphone at the remote end of this tube receives sound passing through the tube and generates an electrical 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 displayed. The signal strength at the output is inversely proportional to the depth of slag in the crucible, as the deeper the slag the more sound is absorbed in the crucible.
REFERENCES:
patent: 3237451 (1966-03-01), Haeff
patent: 3240674 (1966-03-01), Ledwidge
patent: 3603149 (1971-09-01), McKown
patent: 3782180 (1974-01-01), Harris
patent: 3807222 (1974-04-01), Eggers
patent: 3910116 (1975-10-01), Smith
patent: 3913407 (1975-10-01), Hanff et al.
patent: 3927569 (1975-12-01), Bergdahl et al.
Appleman John S.
ARBED - Acieries Reunies de Burbach-Eich-Dudelange S.A.
Queisser Richard C.
Ross Karl F.
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