DEFINITION OF ALTIMETER

An instrument, typically an aneroid barometer,

that is used for determining the elevation or height above sea

level. Aneroid barometer style altimeters operate by precisely

measuring the change in atmospheric pressure, that decreases

with increasing height above sea level, since there is less air

exerting pressure at a point at higher elevations than at lower

elevations. Altimeters need to be calibrated each day at a

known elevation, to account for weather-related changes in

atmospheric pressure.

Before 1928 there was no possible way for pilots to

know how far above the ground they were. The German

inventor Paul Kollsman invented the first reliable and accurate

barometric altimeter. The altimeter measured altitude by barometric

pressure. Pilots still use the barometric altimeter today.

In 1924 Lloyd Espenschied invented the first radio

altimeter. In 1938 Bell Labs demonstrated the first radio

altimeter. A radio altimeter uses radio signals that bounce off

of the ground and back to the receiver in the plane showing

pilots the altitude of the aircraft. A radar altimeter works

much in the same way except it bounces the signal off of an

object in the air thus telling the height of the object above the

ground. A laser altimeter can measure the distance from a

spacecraft or satellite to a fixed position on Earth. The measurement

when compiled with radial orbit knowledge can

provide the topography of the Earth.

Title Post:
Rating: 100% based on 99998 ratings. 99 user reviews.
Author:

Terimakasih sudah berkunjung di blog SELAPUTS, Jika ada kritik dan saran silahkan tinggalkan komentar