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|Title: ||Design, implementation, and characterisation of a novel lidar ceilometer|
|Authors: ||Vande Hey, Joshua D.|
|Keywords: ||Lidar ceilometer|
Automated cloud detection
Cloud base height
Geometrical form factor
Boundary layer aerosol profiling
Attenuated backscatter calibration
|Issue Date: ||2013|
|Publisher: ||© Joshua D. Vande Hey|
|Abstract: ||A novel lidar ceilometer prototype based on divided lens optics has been designed, built,
characterised, and tested. The primary applications for this manufacturable ground-based
sensor are the determination of cloud base height and the measurement of vertical visibility.
First, the design, which was developed in order to achieve superior performance at a
low cost, is described in detail, along with the process used to develop it. The primary
design considerations of optical signal to noise ratio, range-dependent overlap of the transmitter and receiver channels, and manufacturability, were balanced to develop an instrument with good signal to noise ratio, fast turn-on of overlap for detection of close range returns, and a minimised number of optical components and simplicity of assembly for cost control purposes.
Second, a novel imaging method for characterisation of transmitter-receiver overlap as a
function of range is described and applied to the instrument. The method is validated by an
alternative experimental method and a geometric calculation that is specific to the unique
geometry of the instrument. These techniques allow the calibration of close range detection
sensitivity in order to acquire information prior to full overlap.
Finally, signal processing methods used to automate the detection process are described. A novel two-part cloud base detection algorithm has been developed which combines extinction-derived visibility thresholds in the inverted cloud return signal with feature
detection on the raw signal. In addition, standard approaches for determination of visibility based on an iterative far boundary inversion method, and calibration of attenuated backscatter profile using returns from a fully-attenuating water cloud, have been applied to the prototype.
The prototype design, characterisation, and signal processing have been shown to be
appropriate for implementation into a commercial instrument. The work that has been carried out provides a platform upon which a wide range of further work can be built.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Mechanical, Electrical and Manufacturing Engineering)|
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