An enclosure for which the interior surfaces of the walls possess the radiation characteristics of a black body.



Related Terms

CAVITY RADIATOR

A heated enclosure with a small opening which allows some radiation to escape or enter; the escaping radiation approximates that of a black body.

CIRCULAR SCANNING

Radar scanning in which the direction of maximum radiation describes a right circular cone.

RADIANT SECTION

The part of a process heater into which the burners fire. Tubes mounted in this area of the furnace receive heat principally via direct radiation from both burner flames and furnace refractory. Physical volume arrangement of the radiant section has a great effect on burner choice and required flame patterns.

SIDE LOBE

Any lobe of the radiation pattern of a directional antenna other than the main or lobe.

DRY DOCKING

To remove the vessel from the water by placing it in a walled enclosure and pumping it dry. The vessel is supported from the localised pressure on its keel and chine by chocks and side shores.

COMPENSATED LOOP RADIO DIRECTION FINDER

A loop antenna radio direction finder for bearing determination, which incorporates a second antenna system designed to reduce the effect of polarization and radiation error.

INSOLATION

Solar radiation received, or the rate of delivery of such radiation.

RADIATION FOG

A major type of fog, produced over land when radiational cooling reduces the temperature to or below its dew point. Radiation fog is a nighttime occurrence although it may begin to form by evening twilight and often does not dissipate until aft sunrise.

CROSSED-NEEDLE METER

A device consisting of two pointer-type analog meters inside a single enclosure with pointer movements centered at different positions so that their point of crossing indicates the value of some function of the two readings.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

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