Distance measurement method making use of electromagnetic wave a

Details Distance measurement method making use of electromagnetic wave a Distance measurement method making use of electromagnetic wave a

1986-12-19

1988-05-10

Lall, Parshotam S.

Boots, shoes, and leggings

342124, 342130, 342174, 340612, G01S 1300, G01S 704, G08B 2100

Patent

active

047440406

ABSTRACT:
A method an apparatus for measuring the distance to a target wherein FM wave is transmitted to the target and its reflected wave is received. A beat wave is then obtained using the thus-received wave and the FM wave. A sine wave is mixed with the beat wave and a first sideband wave of a plurality of sideband waves of the resultant mixed wave is obtained. Another sine wave is mixed with the sideband wave. Then, a second sideband wave of the thus-obtained mixed wave is separated and detected. In the above manner, phase modulation is applied directly to the above-described beat wave. Information pertaining to distance can then be obtained from the number of peaks of the thus-modulated beat wave. A microwave profile meter suitable for use in the determination of the surface profile of a burden in a blast furnace is also disclosed.

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