Methods and apparatus for mechanical resonance monitoring a...

Details Methods and apparatus for mechanical resonance monitoring a... Methods and apparatus for mechanical resonance monitoring a...

2007-04-03

2007-04-03

Kwok, Helen (Department: 2856)

Measuring and testing

Gas analysis

Solid content of gas

C073S024030

Reexamination Certificate

active

11029285

ABSTRACT:
A particulate mass monitor includes a controller that monitors a change in a resonant oscillation frequency of a taut metallic membrane, as caused by deposition of the particulate matter on the metallic membrane. The metallic membrane, such as a foil or metallized plastic film, is substantially mechanically stable under tension. Application of a tension to the periphery of the metallic membrane generates a substantially constant tension within the membrane, thereby allowing the particulate mass monitor to detect a particulate mass concentration of the air sample with a relatively high degree of accuracy. Additionally, the particulate mass monitor includes a membrane transporter that automatically advances the metallic membrane within the particulate mass monitor. The membrane transporter minimizes the necessity for manual replacement of the metallic membrane over time and allowing long term, unattended operation of the particulate mass monitor.

REFERENCES:
patent: 3569825 (1971-03-01), Lilienfeld
patent: 3879992 (1975-04-01), Bartera
patent: 4446720 (1984-05-01), Sinclair
patent: 5349844 (1994-09-01), Lilienfeld
patent: 6167747 (2001-01-01), Koch et al.
patent: 1059521 (2000-12-01), None

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