Valdemar Poulsen Biography, Valdemar Poulsen Wiki
Valdemar Poulsen Wiki: Valdemar Poulsen was born on 23rd November 1869 and died on 23rd July 1942. He was a Danish engineer who made significant contributions to early radio technology. Valdemar developed a magnetic wire recorder called the telegraphone in 1898 and the first continuous wave radio transmitter, the Poulsen arc transmitter, in 1903, which was used in some of the first broadcasting stations until the early 1920s.
Valdemar Poulsen’s Principle of Magnetic Recording
He demonstrated the principle of magnetic recording as early as 1898 in his telegraphone. Magnetic wire recording, and its successor, magnetic tape recording, involve the use of a magnetizable medium which moves past a recording head. An electrical signal, which is analogous to the sound that is to be recorded, is fed to the recording head, inducing a pattern of magnetization similar to the signal. A playback head (which may be the same as the recording head) can then pick up the changes in the magnetic field from the tape and convert them into an electrical signal.
Valdemar Poulsen’s US patent for a magnetic wire recorder
In 1898, Poulsen obtained a Telegraphone Patent, and with the help of his assistant, Peder O. Pedersen, later developed other magnetic recorders that recorded on steel wire, tape, or disks. None of these devices had electronic amplification, but the recorded signal was easily strong enough to be heard through a headset or even transmitted on telephone wires. At the 1900 World’s Fair in Paris, Poulsen had the chance to record the voice of Emperor Franz Josef of Austria which is believed to be the oldest surviving magnetic audio recording today.
Valdemar Poulsen’s Arc Converter
Poulsen developed an arc converter in 1908, referred to as the “Poulsen Arc Transmitter,” which was widely used in radio before the advent of vacuum tube technology. The system was able to communicate between Lyngby and Newcastle with a 100-foot mast.
Valdemar Poulsen Death and Cause
He died on 23 July 1942 aged 72 years of Natural Causes.
Valdemar Poulsen Legacy
A stamp was issued in honor of Poulsen in 1969.
The Valdemar Poulsen Gold Medal was awarded each year for outstanding research in the field of radio techniques and related fields by the Danish Academy of Technical Sciences. It was presented on 23rd November, during the anniversary of his birth, and Poulsen himself received the inaugural award in 1939. The award was discontinued in 1993.
Valdemar Poulsen Google Doodle
On 23rd November 2018, Google dedicated a doodle to Valdemar Poulsen on his 148th Birthday Anniversary for his innovations in magnetic sound recording and long-range radio transmission. Many modern conveniences, from telephone answering machines to cassettes, even VHS tapes, and floppy disks, used the basic technology that he developed by stringing a steel piano wire at a slight angle between two walls. By sliding an electromagnet down the wire he was able to record sound using a microphone and play it back through a telephone earpiece.
Valdemar Poulsen Wiki