Certainteed Corporation

General Signal Corporation

Brian M Ence

Michael N Trainer

Maurice James Kelley

William L Wilcock

A device for determining density of a material flowing in a conveying system includes a duct segment in fluid communication with the conveying system. The duct segment is coupled to the conveying system by isolation fittings, which allow the weight of the duct segment to be measured independent of the weight of adjacent portions of the conveying system. Further, a method for determining density of a material flowing in a conveying system includes weighing a duct segment having material free fluid flowing therein. The duct segment having a mixture of material and fluid flowing therein is also weighed. The difference of the two weights is used to determine a linear density of the material.

Device for measuring density of material flowing in a conveying duct

Apparatus and method are provided for measuring a dimension of an airborne fiber. The apparatus includes a flow channel for providing a laminar flow to at least a portion of the fibers in air sample and a light source for projecting a light beam along a selected beam path to impinge upon a first fiber in the sample to create scattered light. A portion of the scattered light is measured by a light detector to produce an electrical output which is related to the fiber's dimension.

Apparatus and method for the dimensional measurement of airborne fibers

Devices and methods for measuring the concentration of airborne fibers are provided. The devices include flow means for providing laminar flow to a portion of the fibers in an air sample and a light source for generating a light beam directed to the laminarly flowing fibers to produce a scattered light. The device further includes a sensor for sensing a portion of this scattered light and for producing an output from which a respirable fiber concentration estimate can be measured.

Device for measuring the concentration of airborne fibers

Apparatus and method for measuring the concentration of airborne fibers are provided. The apparatus includes a flow channel for providing laminar flow to a portion of the fibers in an air sample and a light source for generating a light beam directed to the laminarly flowing fibers to produce a scattered light. The apparatus further includes a sensor for sensing a portion of this scattered light and for producing an output from which a fiber concentration estimate can be measured.

Apparatus and method for the measurement and separation of airborne

A method of measuring the size distribution of moving particles within a scattering medium includes a step of directing a beam of light into the scattering medium. The frequency of the scattered light is compared to nonscattered light emitted from the scattering medium and results in the generation of a first signal having a magnitude which is indicative of the difference in frequency between the scattered light and the nonscattered light. A second signal is generated having a magnitude which varies with frequency on a linear scale. The frequency scale of the second signal is then translated to a logarithmic scale. Finally, the translated second signal is deconvolved to determine the size and distribution of moving particles within the scattering medium.

Growing community of inventors

Lansdale, PA, United States of America

Brian M Ence