G - Physics – 01 – F
Patent
G - Physics
01
F
349/39
G01F 1/66 (2006.01)
Patent
CA 1187597
18. ABSTRACT OF THE DISCLOSURE An arrangement for monitoring passage of airborne particles through conduits especially for airflow seeding in which there is an impact target and the sound generated by impacting particles is detected and a preferred frequency is examined for sustained level to cause an output warning signal. Sensitivity is assisted by having the impact target uppermost in a secondary distribution head.
393271
Ridout & Maybee Llp
Symonds Darrell C.
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