@inproceedings{3050069,
    title = "Enhancement of the intelligent leaf sensor",
    author = "Sigrimis, NA and Rerras, N",
    year = "1998",
    pages = "231-239",
    publisher = "International Society for Horticultural Science (ISHS)",
    booktitle = "SECOND INTERNATIONAL SYMPOSIUM ON SENSORS IN HORTICULTURE",
    doi = "10.17660/ActaHortic.1998.421.24",
    keywords = "sensors; intelligence; mist; fog",
    abstract = "The maintenance of a suitable humidity environment in plant propagation
chambers is a prerequisite for successful root growth of plant cuttings.
This paper describes an innovative sensing method which has been
developed to replace leaf sensors in plant propagation systems. Such
chambers present critical situations for control because of the high
humidity levels to be maintained, which makes direct sensing methods
unsuitable. The new method is based on the fact that conditions of the
microclimatic space are fully determined by the surrounding space, and
implicitly relates the transfer phenomena between the two spaces through
the selection of control parameters. The measured macroclimatic
variables together with the identified control parameters provide an
estimate of the moisture loss and determine the rate at which humidity
should be supplied in the propagation chamber. An adaptive system guides
the selection of control parameters on-line, in a process leading to
optimal system performance. The system is performance driven, conducts
real experiments on the site and uses a modified descent method to
maximise performance. The performance surface was studied and a
modification of the searching algorithm has improved the learning rate
significantly."
}