Measuring and testing – Volumetric content measuring
Patent
1984-06-29
1985-12-31
Swisher, S. Clement
Measuring and testing
Volumetric content measuring
G01F 1700
Patent
active
045612986
ABSTRACT:
A method of, and apparatus for, measuring the free volume of a confined space or container is described. The method comprises applying to the gas or vapor within the confined space or container repeated compressions of predetermined waveform by means of a barrier or diaphragm; generating electrical signals representative of the resultant variation of pressure within the confined space or container; repeatedly sampling said electrical signals at regular predetermined instants, or over regular predetermined time ranges, corresponding to predetermined points or regions of said waveform; combining or integrating the sampled signals to generate thereby a time-averaged output signal; and calculating the free volume of the confined space or container from the output signal thus obtained. In one embodiment, the apparatus comprises (1) diaphragm means, for applying repeated compressions to said confined space or container; (2) drive means for moving said diaphragm means in accordance with a predetermined waveform; (3) a pressure-sensitive transducer for measuring pressure changes within the volume which is itself to be measured; (4) electrical circuit means connected to said pressure-sensitive transducer and to said drive means, for sampling the electrical output of said pressure-sensitive transducer at predetermined times related to the frequency at which the diaphragm means is driven and for generating a time-averaged output signal from the signals generated by said electrical circuit means; and (5) means for determining from said time-averaged output signal a value representative of the free volume being measured.
REFERENCES:
patent: 3075382 (1963-01-01), Mathias
patent: 3237451 (1966-03-01), Haeff
patent: 4474061 (1984-10-01), Parker
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