Dust sensor apparatus

Details Dust sensor apparatus Dust sensor apparatus

1998-03-20

1999-06-08

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, 310366, H01L 4108

Patent

active

059107006

ABSTRACT:
A dust sensing apparatus uses a transducer element oscillating at a resonant frequency to detect changes in dust concentration. The transducer is fabricated from a polymer material which oscillates when a voltage is applied. The presence of dust affects the oscillation frequency. Dampening of the frequency by the dust presence changes the electrical resistance provided by the transducer. Electronic circuitry computes the level of dust by measuring and controlling the level of the AC signal required to maintain the oscillation frequency by monitoring the resistance.

REFERENCES:
patent: 4431938 (1984-02-01), Inoue
patent: 4562725 (1986-01-01), Oka et al.
patent: 4911801 (1990-03-01), Pons
patent: 4965698 (1990-10-01), Thoma et al.
patent: 5089741 (1992-02-01), Park et al.
patent: 5129262 (1992-07-01), White et al.
patent: 5212988 (1993-05-01), White et al.
patent: 5417100 (1995-05-01), Miller et al.
patent: 5478756 (1995-12-01), Gizeli
patent: 5517076 (1996-05-01), Takeuchi et al.
patent: 5637949 (1997-06-01), Isogai et al.
patent: 5698931 (1997-12-01), Shibata et al.

Affiliated with

Also associated with

Rating

Dust sensor apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dust sensor apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dust sensor apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1684991