(n.) An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance.
Example Sentences:
(1) The use of a bolometer as an objective measure in uveitis was significant only in the more severe cases of uveitis.
(2) The subsequent changes in temperature of the nasal bulbar conjunctiva were monitored using an infra-red bolometer.
Thermopile
Definition:
(n.) An instrument of extreme sensibility, used to determine slight differences and degrees of heat. It is composed of alternate bars of antimony and bismuth, or any two metals having different capacities for the conduction of heat, connected with an astatic galvanometer, which is very sensibly affected by the electric current induced in the system of bars when exposed even to the feeblest degrees of heat.
Example Sentences:
(1) Measurements were made of their absolute sensitivity and linearity, and their response to various UVR sources was compared to that of Hilger Schwarz FT17 and FT32 vacuum compensated thermopiles.
(2) Thermopile heat conduction calorimeters normally have high time constants.
(3) In general, however, and specifically with regard to modern thermopiles, a homogeneous approximation will lead to significant errors.
(4) Performance of the thermopiles is demonstrated with initial heat records from rabbit right ventricular papillary muscles and a bundle of frog semitendinosus muscle fibers.
(5) The heat produced by the complete cycle was attributed to the movement of the muscles over the thermopile.
(6) The in vitro experiments were performed by simultaneous isometric force and heat measurements using sensitive antimony-bismuth thermopiles.
(7) Using metal-film thermopiles, heat production of isolated rabbit papillary muscles was measured under aerobic conditions at 20 degrees C. The time course of total heat production resulting from a single contraction (average of 10) and a twitch train of 10 contractions (0.2 Hz) was separated into initial (I) and recovery heat (R).
(8) Using Laplace transforms, transfer functions are derived for the temperature change in the center of the thermopile as a function of the temperature at any interface between differing materials or as a function of heat production in the muscle.
(9) The increase in rate of heat production caused by stretch in the unstimulated frog's sartorius (stretch response) has been measured using a conventional thermopile technique.2.
(10) A method of fabricating Hill-Downing type, planar thermopiles by vacuum-deposition techniques is described in detail.
(11) The additional ceramic heat sink diminished, but did not eliminate, the initial surge in the 2M thermopile output voltage following exposure.
(12) In control experiments with a resistor of known heat capacity comparable to a single muscle fibre, it was found that Peltier and Joule heating produced identical thermopile outputs.
(13) It starts as soon as the compound action potential reaches the thermopile and lasts for about 107 msec.5.
(14) The heat and force produced in tetanic contraction of single fibres from anterior tibialis muscle of the frog Rana temporaria have been observed at measured temperatures close to 1 and 10 degrees C. Heat was measured using a Hill-Downing type thermopile.
(15) Using microcalorimeters of the thermopile conduction type heat production was measured in lymphocytes from peripheral blood in 8 normals and 10 patients with chronic lymphocytic leukaemia (CLL).
(16) Infrared-emitting diodes are used to heat the thermopile and muscle artificially for thermal time constant and conduction-delay measurements.
(17) The preparation was mounted on a thermopile and connected to a force transducer, to allow simultaneous measurement of muscle heat production and force.
(18) Heat production was measured by thermopiles and a novel apparatus was employed for freezing the muscles rapidly at a chosen instant so as to halt the chemical processes before analysis.3.
(19) Many previous measurements with myothermic thermopiles were corroborated with this method.
(20) Any version of the 2M thermopile could be used for relative day-to-day monitoring of all UVR sources, and the version with the widest acceptance angle could be used for the absolute radiometry of certain extended sources.