David E Kimball, 68Waldorf, MD

4568190, Feb 4, 1986

Oct 15, 1984

6/661528

Hugh R. Carlon - Edgewood MD
David V. Kimball - Aberdeen MD
Robert J. Wright - Joppa MD

The United States of America as represented by the Secretary of the Army - Washington DC

G01N 2100

356439

An electrooptical system and technique for direct quantitative measurement of the mass concentration of monodisperse aerosols by means of filling an enclosed chamber with a cloud or a sequence of separate clouds of essentially transparent and spherical, aerosolized particles or droplets of known density and known or selectively controlled particle size. While within the confines of the chamber the cloud, or each of the sequence of clouds, of aerosolized particles is maintained in a homogeneous condition and irradiated with a beam of high-intensity and constant wavelength irradiation selected to possess a wavelength to particle size ratio wherein attenuation of the irradiation will be almost exclusively, if not nearly entirely, attributable to optical scattering. The mass concentration of the cloud, or each of the sequence of clouds, of aerosolized particles is directly and quantitatively measured, or monitored, as a direct function of the measured magnitude, or intensity, of the attenuated beam of irradiation transmitted through the cloud. The results provide a reliably accurate measurement to within a minimal margin of error of. +-.

2014026, Sep 18, 2014

Mar 15, 2013

13/834467

- New York NY, US
David Ralph Kimball - Annapolis MD, US

G01V 1/18

367135

Methods and devices are disclosed for measuring low levels of acceleration caused by low frequency seismic waves. For example, an omnidirectional beam accelerometer configured to measure low frequency waves is disclosed. The omnidirectional beam accelerometer may include three beam acceleration sensors. Each beam acceleration sensor may include a respective mass and a respective beam. Each respective beam may be comprised at least in part of a piezoelectric material. Each beam acceleration sensor may have a ratio of mass density [kg/m] to beam stiffness [N/m] of at least 4.5×10kg/Nm. The omnidirectional beam accelerometer may also include a housing to ensure the sensors are operating in orthogonal directions and an interface circuit to interface between the sensor and external circuitry.