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Any of several radiometric instruments, such as a pyrheliometer, used chiefly for meteorological measurements of terrestrial and solar radiation.

ac′ti·no·met′ric (-nō-mĕt′rĭk), ac′ti·no·met′ri·cal adj.
ac′ti·nom′e·try n.


(General Physics) an instrument for measuring the intensity of radiation, esp of the sun's rays
actinometric, ˌactinoˈmetrical adj
ˌactiˈnometry n


(ˌæk təˈnɒm ɪ tər)

a device for measuring intensity of radiation, esp. that of the sun.
ac`ti•no•met′ric (-noʊˈmɛ trɪk) adj.
ac`ti•nom′e•try, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.actinometer - an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something


n (Met) → Aktinometer nt
References in periodicals archive ?
Parker, "A new sensitive chemical actinometer," Proceedings of Royal Society of London Series A, Mathematical and Physical Sciences, vol.
The incident light intensity, measured with a uranyl actinometer, was 1.38 x [10.sup.-9] Einstein [s.sup.-1].
While chemical actinometers can be used to measure sample dose, selecting a suitable chemical actinometer involves trade-offs.
July 14 'On A Sun-gauge or New Actinometer', Empire, p.
The absolute, total intensity of the LED was measured with the chemical actinometer, potassium ferrioxalate, which is recommended for the 253-577 nm wavelength range.
Due to closeness of Tartu and Toravere, the same radiation sensor (Yanishevsky actinometer AT-50) and unchanged measurement methods used, the data of both stations can be combined in one time series, covering the years 1950-2006.
The ICH-QIB guideline specifies a chemical actinometer for measurement of the exposure dose, which is an ampoule containing a photosensitive solution which converts the absorbed light quantity at a specific rate.
In parallel, broadband direct solar irradiance [S.sub.h] was registered at Toravere every 3 min (an AT-50 actinometer was used as an operational pyrheliometer).
The fraction of light energy absorbed by the reaction mixture was determined with a ferrioxalate actinometer [19].