Note: Active optical detection of cloud from a balloon platform

R. G. Harrison, K. A. Nicoll

Research output: Contribution to journalArticlepeer-review

14 Citations (SciVal)


A disposable backscatter instrument is described for optical detection of cloud in the atmosphere from a balloon-carried platform. It uses an ultra-bright light emitting diode (LED) illumination source with a photodiode detector. Scattering of the LED light by cloud droplets generates a small optical signal which is separated from background light fluctuations using a lock-in technique. The signal to noise obtained permits cloud detection using the scattered LED light, even in daytime. The response is interpreted in terms of the equivalent visual range within the cloud. The device is lightweight (150 g) and low power ($30 mA), for use alongside a conventional meteorological radiosonde.
Original languageEnglish
Article number066104
Number of pages1
JournalReview of Scientific Instruments
Issue number6
Publication statusPublished - 1 Jun 2014


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