Recently, remote sensing systems for measuring atmospheric pressure have been proposed which utilize the dispersion in the atmospheric refractivity as the basis for their operation.1-4 However, since this dispersion is small, timing ocean surface reflections from simultaneously transmitted pulses at different wavelengths must be performed to picosecond-level accuracies. For example, when utilizing the 532-and 355-nm harmonics from a mode-locked Nd:YAG laser and transmitting through the entire atmosphere at nadir, 1.4-psec timing accuracies are required for a 1-mbar pressure accuracy. Since the ocean surface depth profile within the illuminating footprint can contribute several nanoseconds of temporal spread in the return,5 high correlation between the dual-wavelength returns is critical for accurate pressure measurements.

© 1984 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription