crystal detector वाक्य
उदाहरण वाक्य
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- However, by the late 1920s, radios using crystal detectors were relegated to use by hobbyists and youth groups and have been used by them as educational devices to the present day.
- "' Cryogenic crystal detectors "'- A technique used by the Cryogenic Dark Matter Search ( CDMS ) detector at the Soudan Mine relies on multiple very cold germanium and silicon crystals.
- During the war, Riordan and Hoddeson say, scientists at AT & T's Bell Laboratories and in England discovered that highly purified silicon could be used in crystal detectors to detect high-frequency radar signals.
- A "'cat's-whisker detector "'( sometimes called a "'crystal detector "') is an antique electronic component consisting of a thin wire that lightly touches a crystal of semiconductor electronic devices ( after photoconductors ).
- During the war, Riordan and Hoddeson say, scientists at AT & AMP; T's Bell Laboratories and in England discovered that highly purified silicon could be used in crystal detectors to detect high-frequency radar signals.
- The crystal detector was developed into a practical device for wireless telegraphy by Greenleaf Whittier Pickard, who invented a silicon crystal detector in 1903 and received a patent for it on November 20, 1906.
- The crystal detector was developed into a practical device for wireless telegraphy by Greenleaf Whittier Pickard, who invented a silicon crystal detector in 1903 and received a patent for it on November 20, 1906.
- A "'rectifier "'is an electrical device that cat's whisker " of fine wire pressing on a crystal of galena ( lead sulfide ) to serve as a point-contact rectifier or " crystal detector ".
- The temperamental, unreliable action of the crystal detector was a barrier to its acceptance as a standard component in commercial radio equipment and was one reason for its rapid replacement by vacuum tubes after 1920.
- These in turn were replaced by the crystal detector around 1906, and then around 1912 by vacuum tube technologies such as John Ambrose Fleming's thermionic diode and Lee De Forest's Audion ( triode ) tube.
- The point-contact crystal detector became vital for microwave radio systems, since available vacuum tube devices could not serve as detectors above about 4000 MHz; advanced radar systems relied on the fast response of crystal detectors.
- The point-contact crystal detector became vital for microwave radio systems, since available vacuum tube devices could not serve as detectors above about 4000 MHz; advanced radar systems relied on the fast response of crystal detectors.
- Because of its relatively long half-life and emission of low-energy photons which can be detected by gamma-counter crystal detectors, I-125 is a preferred isotope for tagging antibodies in radioimmunoassay and other gamma-counting procedures involving proteins outside the body.
- His interests focused on the point-contact crystal detector ( cat's whisker detector ), which was used as a demodulator in the first early radio receivers, crystal radios, before powered vacuum tube radios were developed in World War 1.
- Lovell had attempted a solution using two dipoles in front of a common parabolic reflector, separated by a metal disk, but found that enough signal leaked through to cause the crystal detectors in the receivers to burn out.
- The crystal detector worsened the problem, because it has relatively low Q . In many circuits, the selectivity was improved by connecting the detector and earphone circuit to a tap across only a fraction of the coil's turns.
- Such variability, bordering on what seemed the mystical, plagued the early history of crystal detectors and caused many of the vacuum tube experts of a later generation to regard the art of crystal rectification as being close to disreputable.
- This troublesome device was superseded by thermionic diodes ( vacuum tubes ) by the 1920s, but after high purity semiconductor materials became available, the crystal detector returned to dominant use with the advent, in the 1950s, of inexpensive fixed-germanium diodes.
- This development was slowed by the German electronic's industry's decision to stop researching microwaves shortly before " Rotterdam Ger�t " literally fell from the sky, and a lack of suitable crystal detectors that were key to the British receiver designs.
- Other radio detectors invented for wireless telegraphy, such as the Fleming valve ( 1904 ) and the crystal detector ( 1906 ) also proved able to rectify AM signals, so the technological hurdle was generating AM waves; receiving them was not a problem.
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