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Title: Method and apparatus for measuring surface density of explosive and inert dust in stratified layers

Abstract

A method for determining the surface density of coal dust on top of rock dust or rock dust on top of coal dust is disclosed which comprises directing a light source at either a coal or rock dust layer overlaying a substratum of the other, detecting the amount of light reflected from the deposit, generating a signal from the reflected light which is converted into a normalized output (V), and calculating the surface density from the normalized output. The surface density S.sub.c of coal dust on top of rock dust is calculated according to the equation: S.sub.c =1/-a.sub.c ln(V) wherein a.sub.c is a constant for the coal dust particles, and the surface density S.sub.r of rock dust on top of coal dust is determined by the equation: ##EQU1## wherein a.sub.r is a constant based on the properties of the rock dust particles. An apparatus is also disclosed for carrying out the method of the present invention.

Inventors:
 [1];  [2]
  1. Finleyville, PA
  2. Bethel Park, PA
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
866802
Patent Number(s):
4793710
Assignee:
United States of America as represented by Secretary of (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; measuring; surface; density; explosive; inert; dust; stratified; layers; determining; coal; top; rock; disclosed; comprises; directing; light; source; layer; overlaying; substratum; detecting; amount; reflected; deposit; generating; signal; converted; normalized; output; calculating; calculated; according; equation; -a; ln; constant; particles; determined; equ1; based; properties; carrying; surface density; rock dust; light reflected; light source; reflected light; coal dust; measuring surface; /356/

Citation Formats

Sapko, Michael J, and Perlee, Henry E. Method and apparatus for measuring surface density of explosive and inert dust in stratified layers. United States: N. p., 1988. Web.
Sapko, Michael J, & Perlee, Henry E. Method and apparatus for measuring surface density of explosive and inert dust in stratified layers. United States.
Sapko, Michael J, and Perlee, Henry E. Fri . "Method and apparatus for measuring surface density of explosive and inert dust in stratified layers". United States. https://www.osti.gov/servlets/purl/866802.
@article{osti_866802,
title = {Method and apparatus for measuring surface density of explosive and inert dust in stratified layers},
author = {Sapko, Michael J and Perlee, Henry E},
abstractNote = {A method for determining the surface density of coal dust on top of rock dust or rock dust on top of coal dust is disclosed which comprises directing a light source at either a coal or rock dust layer overlaying a substratum of the other, detecting the amount of light reflected from the deposit, generating a signal from the reflected light which is converted into a normalized output (V), and calculating the surface density from the normalized output. The surface density S.sub.c of coal dust on top of rock dust is calculated according to the equation: S.sub.c =1/-a.sub.c ln(V) wherein a.sub.c is a constant for the coal dust particles, and the surface density S.sub.r of rock dust on top of coal dust is determined by the equation: ##EQU1## wherein a.sub.r is a constant based on the properties of the rock dust particles. An apparatus is also disclosed for carrying out the method of the present invention.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Patent:

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