Radiometer-radiation instrument, Biology

Assignment Help:

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


Related Discussions:- Radiometer-radiation instrument

How did darwin reach the principle of natural selection, How did Darwin rea...

How did Darwin reach the principle of natural selection from the observation of differences among individuals of the same species? The Darwin recognized that in a same species

How hiv infection works, How do antibody-based tests detect how HIV infecti...

How do antibody-based tests detect how HIV infection works? After the infection by the HIV the immune system starts the production of antibodies (primary immune response) again

How pathologic conditions causing the underweight, How Pathologic Condition...

How Pathologic Conditions causing the underweight? Illness can affect weight status in a number of ways. For example, fevers and infections increase the demand for energy, whic

Explain magnetic stirrer - food microbiology, Explain Magnetic Stirrer - Fo...

Explain Magnetic Stirrer - Food Microbiology It can be used for mixing ingredients at the time of media or reagents preparation. Mixing happens with spinning of a teflon coat

Regulation of respiration, Regulation of Respiration Whenever the need...

Regulation of Respiration Whenever the need for oxygen in the body increases, ventilation of the respiratory organs also increases. In the same way whenever the level of oxyge

How different are the respiration in fishes, How different are the respirat...

How different are the respiration in fishes and the respiration in adult amphibians? In fishes gas exchange is completed by direct contact of water with the branchiae (gills).

Group selection, The effect of natural selection on colonies or population ...

The effect of natural selection on colonies or population favouring one group in preference to other may be referred to as group selection. A group can be the smallest collection o

Objection of cell theory, OBJECTION OF CELL THEORY (REASONS OF DISCARTION) ...

OBJECTION OF CELL THEORY (REASONS OF DISCARTION) (i)       Living organism are composed of various types of cells and their product but members of monera & protista don't have

What is adaptive convergence?, What is adaptive convergence? The Adapti...

What is adaptive convergence? The Adaptive convergence is the phenomenon by which living beings facing the same environmental pressure (problems) and undergoing genetic variabi

Biology, how can i get an demo assignment to solve?

how can i get an demo assignment to solve?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd