Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1984-11-15
1986-09-23
Ciarlante, Anthony V.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73159, G01N 2900
Patent
active
046128077
ABSTRACT:
The invention relates to an apparatus for dynamically determining the local weight per unit area of sheet-like material, for example, paper, in which the sheet-like material is exposed to sound waves from a sound transmitter. The portion of sound transmitted and/or reflected by the sheet-like material is measured by aid of a receiver and the weight per unit area determined from the measuring signal. In order to avoid disturbances of the measuring signal due to superimposed sound waves and in order to obtain high local resolution even in the case of quickly moving material to be measured, the transmitter, material to be measured and possibly the receiver as well are arranged on a slant relative to each other in such a way that the portions of sound reflected on these elements are faded out of the path of rays between the transmitter and the receiver. Means are additionally provided to prevent the faded out portions of sound from returning to the path of rays between the transmitter and the receiver.
REFERENCES:
patent: 2912854 (1959-11-01), Schubring
patent: 2984756 (1961-05-01), Bradfield
patent: 3470734 (1969-10-01), Agdur et al.
patent: 3624712 (1971-11-01), Weighart
Ciarlante Anthony V.
Gao Gesellschaft fur Automation and Organisation mbH
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