Vertical Scanning

Vertical Scanning

 

sequential (line by line) discrete scanning of a television image in a vertical direction. A vertical scanning generator with a deflecting system moves the electronic beam from top to bottom linearly over time (direct stroke) on the screen of the kinescope or photosensitive (target) electrode of the pick-up tube and then returns rapidly to the initial position (back stroke). The duration of the back stroke is nearly 8 percent of the scan period. The vertical sweep frequency (frame frequency)is equal to the rated frequency of the commercial mains (50 or60 cycles per sec).

References in periodicals archive ?
Contract award: acquisition of a profilometer by white light interferometry with vertical scanning for the university of strasbourg.
Humminbird also offers a vertical scanning system called Down Imaging.
Other useful features include an automated scanning mount that enables full 260 degree horizontal and 120 degree vertical scanning, so the systems response does not depend on path length.
Using a new focus-variation vertical scanning microscope, the researchers could see extensive surface detail like never before.
With cameras and monitors, several versions of HD are in use and are described by horizontal lines of resolution and the type of vertical scanning provided.
To maximise the efficiency of the scan and reduce the optical pathway, OBM is using a complex optical system combining a Bravais lens system (US Patent 5966252, 1999) which has a negative power, two holographic optical elements, a telephoto Fourier transform, a demagnifying transform lens and a vertical scanning subsystem.
The TIPM CAT scanner was modified to allow vertical scanning by rotating it 90 degrees.
Horizontal and vertical scanning mirrors, coupled with an optical lens, produce a projection of the detector in object space.
A bi-optic scanner from KTP combines flatbed and vertical scanning in one unit.
Building upon its previously purchased T-Ray 4000[R], NICT is expanding its base system capability, by incorporating a CT gantry with a 20" horizontal and a 12" vertical scanning capability.
Contract notice: Acquisition of a profilometer by white light interferometry to vertical scanning for the university of strasbourg.