Radiometer-radiation instrument, Biology

Radiometer

Radiometer measures the flux of energy of all wavelengths received on a single surface of the receiver. There are also instruments that can measure the difference between the downward incident solar radiation and upward streams of reflected re-radiation and gives us the net value of radiation. This is called net radiometer (Fig shown below). It has two exposed surfaces one upward facing (x) and another downward facing (y). The principle of this instrument is similar to that of the pyrenometer. The receiver A is a long thin blackened metal strip which is painted white on either side. The white and blackened parts of this strip are connected to a thermocouple. Since the black receiver is not enclosed within a glass cover, it responds to all wavelengths. However, exposed receiver may not give us very accurate value because its surface may transfer heat to air by convection and conduction. Moreover, the moisture can also influence it. To avoid such disturbances tbe receiver is either ventilated at a constant rate or it is covered by suitable material which is transparent to visible as well as infrared radiations. At meteorological depamnent of India, Punc, solar radiation is measured by a thermoelectric pyrenometer. The sensor is made up of blackened c,opper constant thermopile. When exposed it gives rise to a thermoel'ectric current proportional to the incident radiation. The current is fed to a continuously recording millivoltmete

1871_radoimeter.jpg

Posted Date: 12/10/2012 5:53:39 AM | Location : United States







Related Discussions:- Radiometer-radiation instrument, Assignment Help, Ask Question on Radiometer-radiation instrument, Get Answer, Expert's Help, Radiometer-radiation instrument Discussions

Write discussion on Radiometer-radiation instrument
Your posts are moderated
Related Questions
Illustrating how neuropsychologists evaluate young preschool children, older children, youngster adults, and elderly adults. The brain is an evolving organ and functions very

Special type of Wards: Additional  accommodation or differences  in size and shape of some of  the special type of wards e.g. Intensive Care Ward, Infectious diseases ward and

Q. What is Angina Pectoris? Chest discomfort is often reported by most patients especially those which are chronic cases of dyslipidemia and/or hypertension. Like diarrhoea and

What is Working of Mouth in human body? Food enters the digestive system through the mouth, where it is processed by the teeth and mixed with saliva, prior to being swallowed.

Photosynthetically Active Radiation This is usually in direct proportion with the incident solar radiation, you know that tropic$ are probably the best illuminated part of the

Post removal Technique -Roto-pro bur - Roto-pro bur is a taper bur having are six-sided, non-cutting flutes used a high-speed hand-piece around the circumference of the post t

Determine the blood plasma levels of glucagon A. production in the liver increases in response to an increase in blood plasma levels of glucagon. B. is secreted by alpha-isl

ABSORPTIO N OF FOOD Absorption from Mouth Here negligible tobacco, alkohal and some medicines as isoprenailne glycerol tri nitrite is absorbed. Absorptio n from Sto

What is the Speech Perception Test The subject is asked to listen to a series of 60 sounds, each of which consists of a double e digraph with varying prefixes and suffixes. The

Define Effect of Deficiency of chromiumin humans? Hallmark of marginal chromium deficiency is impaired glucose tolerance. Individuals receiving TPN without chromium have been s