| 摘要 |
<p>An optical communication system for drill hole logging comprises an armoured cable 58a containing one or more optical glass fibres 23a and 28 inside a tubular moisture barrier, a neodymium laser 21a capable of radiating infrared light into at least one of the glass fibres, a modulator 31 in a downhole cable-head connector shell 10a for modulating light and returning it to the surface, and a semiconductor detector 34a for demodulating the data signal from the returning light. <IMAGE></p> |
