Editing Ceilometer (section)

== Hazards ==
Ceilometers that use visible light can sometimes be fatal to birds, as the animals become disoriented by the light beams and suffer exhaustion and collisions with other birds and structures.<ref name="Allen">{{cite news |last1=Allen |first1=Nick |title=10,000 birds trapped in Twin Towers memorial light |url=https://www.telegraph.co.uk/news/worldnews/northamerica/usa/8005051/10000-birds-trapped-in-Twin-Towers-memorial-light.html |access-date=28 December 2021 |work=The Telegraph |date=September 15, 2010}}</ref> In the worst recorded ceilometer non-laser light beam incident, approximately 50,000 birds from 53 different species died at [[Robins Air Force Base|Warner Robins Air Force Base]] in the United States during one night in 1954.<ref name="Johnston">{{cite journal
| last=Johnston | first=D
|author2=Haines
| title=Analysis of Mass Bird Mortality in October, 1954
| journal=The Auk
| year=1957
| doi=10.2307/4081744
| volume=74
| issue=4
| pages=447| jstor=4081744
| doi-access=free
}}</ref>

Laser ceilometers use invisible lasers to observe the cloud base. Using optical instruments such as binoculars near ceilometers is not recommended, because lenses in instruments could concentrate the beam and damage one's eyes.<ref>{{Cite web | url = http://www.iag.co.at/uploads/tx_iagproducts/pdf_handbuch/CL31.de.pdf | title = Vaisala Ceilometer CL31 User'S Guide | website = www.iag.co.at | accessdate = 2015-04-02 | archive-url = https://web.archive.org/web/20150402120142/http://www.iag.co.at/uploads/tx_iagproducts/pdf_handbuch/CL31.de.pdf | archive-date = 2015-04-02 | url-status = dead }}</ref><ref name="Gaumet">{{cite journal |last1=Gaumet |first1=J. L. |last2=Heinrich |first2=J. C. |last3=Cluzeau |first3=M. |last4=Pierrard |first4=P. |last5=Prieur |first5=J. |title=Cloud-Base Height Measurements with a Single-Pulse Erbium-Glass Laser Ceilometer |journal=Journal of Atmospheric and Oceanic Technology |date=1 February 1998 |volume=15 |issue=1 |pages=37–45 |doi=10.1175/1520-0426(1998)015<0037:CBHMWA>2.0.CO;2 |bibcode=1998JAtOT..15...37G |language=EN |issn=0739-0572|doi-access=free }}</ref>