Photothermal method of determining calorific properties of coal
Abstract
Predetermined amounts of heat are generated within a coal sample by directing pump light pulses of predetermined energy content into a small surface region of the sample. A beam of probe light is directed along the sample surface and deflection of the probe beam from thermally induced changes of index of refraction in the fluid medium adjacent the heated region are detected. Deflection amplitude and the phase lag of the deflection, relative to the initiating pump light pulse, are indicative of the calorific value and the porosity of the sample. The method provides rapid, accurate and nondestructive analysis of the heat producing capabilities of coal samples. In the preferred form, sequences of pump light pulses of increasing durations are directed into the sample at each of a series of minute regions situated along a raster scan path enabling detailed analysis of variations of thermal properties at different areas of the sample and at different depths.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 6889501
- Application Number:
- ON: DE84011089
- Assignee:
- Dept. of Energy
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; 47 OTHER INSTRUMENTATION; COAL; CALORIFIC VALUE; MEASURING INSTRUMENTS; PHOTOMETERS; THERMAL ANALYSIS; CARBONACEOUS MATERIALS; COMBUSTION PROPERTIES; ENERGY SOURCES; FOSSIL FUELS; FUELS; MATERIALS; 010600* - Coal, Lignite, & Peat- Properties & Composition; 440300 - Miscellaneous Instruments- (-1989)
Citation Formats
Amer, N M. Photothermal method of determining calorific properties of coal. United States: N. p., 1983.
Web.
Amer, N M. Photothermal method of determining calorific properties of coal. United States.
Amer, N M. Mon .
"Photothermal method of determining calorific properties of coal". United States.
@article{osti_6889501,
title = {Photothermal method of determining calorific properties of coal},
author = {Amer, N M},
abstractNote = {Predetermined amounts of heat are generated within a coal sample by directing pump light pulses of predetermined energy content into a small surface region of the sample. A beam of probe light is directed along the sample surface and deflection of the probe beam from thermally induced changes of index of refraction in the fluid medium adjacent the heated region are detected. Deflection amplitude and the phase lag of the deflection, relative to the initiating pump light pulse, are indicative of the calorific value and the porosity of the sample. The method provides rapid, accurate and nondestructive analysis of the heat producing capabilities of coal samples. In the preferred form, sequences of pump light pulses of increasing durations are directed into the sample at each of a series of minute regions situated along a raster scan path enabling detailed analysis of variations of thermal properties at different areas of the sample and at different depths.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {5}
}