Volume 1, Issue 1 (January 2005)                   IJEEE 2005, 1(1): 36-40 | Back to browse issues page

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Abstract:   (9697 Views)
In this paper altitude measurement from water surface using laser beam is presented. Research data indicate that the reflection of infrared waves from water surface is about zero and it is less than 2% for visible radiations. Phase-shift and heterodyne technique was used for the measurement, and the laser beam ( mW p nm 10 , 700 = = l ) was modulated by a sine wave having a fixed frequency. The optimum design and low-noise elements made it possible to detect a light power about 20 nW at operating frequency.
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Type of Study: Research Paper |
Received: 2008/10/12 | Revised: 2009/09/08 | Accepted: 2009/09/08