from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An instrument that measures radiant energy by correlating the radiation-induced change in electrical resistance of a blackened metal foil with the amount of radiation absorbed.
from The Century Dictionary.
- noun An instrument devised by Professor S. P. Langley of the United States for measuring very small amounts of radiant heat.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Physics) An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also
actinic balance, thermic balance.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A sensitive device for detecting and measuring the
energyof electromagnetic radiation
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an instrument that measures heat radiation; extremely sensitive
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
Professor Langley is at work upon it with new and specially constructed apparatus, including a "bolometer" so sensitive that, whereas previous experimenters have thought themselves fortunate if they could get deflections of ten or twelve galvanometric divisions to work with, he easily obtains three or four hundred.
We have no time or space here to describe Professor Langley's "bolometer;" it must suffice to say that it seems to stand to the thermopile much as that does to the thermometer.
The scintillating bolometer is currently at the Orsay University Centre in France, where the team is working to optimise the device's light gathering, and carrying out trials with other BGO crystals.
The QUaD telescope is a bolometer, essentially a thermometer that measures how certain types of radiation increase the temperature of the metals in the detector.
The researchers from the University of Zaragoza (UNIZAR) and the Institut d'Astrophysique Spatiale (IAS, in France), made assumptions about the nature of dark matter based on theoretical studies, and developed device called a "scintillating bolometer" to detect the result of interaction of dark matter with material inside the detector.
"The new scintillating bolometer has performed excellently, proving its viability as a detector in experiments to look for dark matter, and also as a gamma spectrometer a device that measures this type of radiation to monitor background radiation in these experiments", says García Abancéns.
The latest is a "scintillating bolometer", a 46-gram device that, in this case, contains a crystal "scintillator", made up of bismuth, germinate and oxygen BGO: Bi4Ge3O12, which acts as a dark matter detector.
Though the last-named investigator has extended our knowledge of it to a point much beyond the lowest visible ray, there yet remains a still remoter region, more extensive than the whole visible spectrum, the study of which has been entered on at Alleghany, by means of the linear bolometer.
This sorts out the different narrow spectral images, without danger of overlapping, and after their passage through the prism we find them again, and fix their position by means of the bolometer, which for this purpose is attached to a special kind of spectrometer, where its platinum thread replaces the reticule of the ordinary telescope.
By means of an ingenious modification of the electrical pyrometer, named the bolometer, valuable researches in measuring solar radiations had been made by Professor