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 (pīr′hē-lē-ŏm′ĭ-tər, pĭr′-)
Any of various devices that measure the intensity of solar radiation received at the earth.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(General Physics) an instrument for measuring the intensity of the sun's radiant energy
pyrheliometric adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌpaɪər hi liˈɒm ɪ tər, ˌpɪr-)

an instrument for measuring the total intensity of the sun's energy radiation.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


an instrument for measuring the intensity of the sun’s radiation. — pyrheliometric, adj.
See also: Instruments
an instrument for measuring the intensity of the sun’s radiation. — pyrheliometric, adj.
See also: Sun
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Digital flow transducer S8011R was used to measure mass flow rate in the range of 50-1000 kg/h, whereas climate data including wind velocity and solar radiations are measured through hot wire anemometer and pyrheliometer model TBS-2-2 with a spectral range of 280-3000 nm and sensitivity of 9.876 [micro]V/W[m.sup.-2].
ASTM, 2005: Standard test method for calibration of a pyranometer using a pyrheliometer. ASTM G167-05, ASTM International, 21 pp, doi:10.1520/G0167-05.
DNI is measured with a first-class pyrheliometer, whereas DIF is measured with a first-class pyranometer with low thermal imbalance and equipped with a tracking shade to permanently block the sun within a subtended cone roughly equal to that of the pyrheliometer's field of view.
Even for solar collectors, depending on the type of concentrator, either a pyranometer or a pyrheliometer is needed for accurate measurement of the received energy.
Pyranometer or pyrheliometer is used to measure solar radiation.
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).
A pyrheliometer, thermometers, a watt-hour meter, and so forth are also installed to collect the data needed for a detailed analysis of the BIPV system.
The "apparent" clear-sky solar transmission (AT) is calculated from the ratio of direct-beam broadband irradiance measurements from a pyrheliometer using fixed atmospheric paths (Ellis and Pueschel 1971).
They measured the angular transmittance and reflectance of both fabrics and draperies with a pyrheliometer. Their results showed that the trans-mittance of the drapery at normal incidence was almost the same as that of the fabric.