Abstract
The development of electromagnetic systems to detect and monitor an in-situ underground coal gasification process requires a knowledge of the electrical properties of coal. Using a two-path interferometer at microwave frequencies, the samples were tested as a function of temperature, electric field polarization and direction of the coal samples. There were not any significant changes in the electrical properties of coal as a function of temperature from ambient up to 700 degree F. However, there were significant variations in the conductivity as a function of polarization, with the vertical polarization possessing lower conductivity. Measurements of electrical properties of coal were also made in the 0. 5-100 MHz region using capacitance techniques. In general, there was a decrease in the values of dielectric constant and an increase in conductivity as the frequency increased.
| Original language | English (US) |
|---|---|
| Title of host publication | Unknown Host Publication Title |
| Pages | 335-341 |
| Number of pages | 7 |
| State | Published - 1800 |
| Externally published | Yes |
| Event | Proc of the Annu Underground Coal Convers Symp, 3rd, Fallen Leaf Lake - Duration: Jun 6 1977 → Jun 9 1977 |
Other
| Other | Proc of the Annu Underground Coal Convers Symp, 3rd, Fallen Leaf Lake |
|---|---|
| Period | 6/6/77 → 6/9/77 |
ASJC Scopus subject areas
- General Engineering