Michael G Apte

US Patent:

7168292, Jan 30, 2007

Filed:

May 14, 2004

Appl. No.:

10/846103

Inventors:

Lara A. Gundel - Berkeley CA, US
Michael G. Apte - Berkeley CA, US
Anthony D. Hansen - Berkeley CA, US
Douglas R. Black - Oakland CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

G01N 37/00
G01N 23/00
G01N 25/00

US Classification:

73 2801, 73 2402

Abstract:

The apparatus described herein is a miniaturized system for particle exposure assessment (MSPEA) for the quantitative measurement and qualitative identification of particulate content in gases. The present invention utilizes a quartz crystal microbalance (QCM) or other mass-sensitive temperature compensated acoustic wave resonator for mass measurement. Detectors and probes and light sources are used in combination for the qualitative determination of particulate matter.

US Patent:

6607700, Aug 19, 2003

Filed:

Jul 9, 1999

Appl. No.:

09/350699

Inventors:

Michael G. Apte - Berkeley CA
Mark K. Goldstein - Del Mar CA
Michelle S. Oum - Chula Vista CA
William B. Helfman - Chula Vista CA

Assignee:

Quantum Group, Inc. - San Diego CA

International Classification:

G01N 1700

US Classification:

422 91, 422 681, 422 50, 422 52, 422 55, 422 56, 422 58, 73 2337, 436134, 436164

Abstract:

CO exposure is a serious public health problem in the U. S. , causing both morbidity and mortality (lifetime mortality risk approximately 10 ). Sparse data from population-based CO exposure assessments indicate that approximately 10% of the U. S. population is exposed to CO above the National Ambient Air Quality Standard. No CO exposure measurement technology is available for affordable population-based CO exposure assessment studies. Two CO measuring devices, an occupational CO dosimeter (LOCD) and an indoor air quality (IAQ) passive sampler, were designed, developed, and tested both in the laboratories and field. Time-weighted-average CO exposure of the compact diffusion tube sampler containing a selective and non-regenerative palladium-molybdenum based CO sensor is quantified by using a simple spectrophotometer. Both devices are capable of measuring CO exposure precisely with relative standard deviation of less than 20% and with bias of less than 10%. Results indicated that the CO exposure distributions measured by LOCD has a precison of about +/-1 ppm.