# focal distance

Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.
Related to focal distance: Effective focal length

## focal distance

[′fō·kəl ‚dis·təns]
(optics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Caption: Seven stills from Zhang Peili's Focal Distance. 1996.
Under a specific tracking error angle, increasing the PTC focal distance would decrease the cavity blackness.
The exact calculated focal distance will be the distance at which the flat front surface of the samples will be located for the scanning, therefore this will be the peak value used as [A.sub.Ref].
The shape of the lens is determined for a focal distance [d.sub.f] = 350 mm.
The radiographs were taken by using a 75-cm focal distance and mammography film (HDC-M, Photon Imaging Systems, Ashton Keynes, United Kingdom).
The 8EoACA[yen]x3EoACA[yen]x5EoACA[yen] unit represents the smallest form factor available and includes auto-focus to eliminate the need for physical contact with the subject to achieve optimal focal distance. Constant screen visibility for the operator minimizes retakes and speeds time for capture.
The one in the front (screen side) is set with the correct focal distance and angle for FaceTime calls, which transmit voice and the live image of the caller as he or she receives the image of the other party.
Through the use of mirrors, the beam is quickly located onto the workpiece surface as required: consider that if the focal distance is 1 m and the requirement calls for spots to be separated by 25.4 mm, it doesn't take much in the way of adjustment to get there.
In the model, C and D represent the edges of the mirror; d is the diameter of the mirror, f is the f number (hence the focal distance is d-f); k is the solar concentration ratio, and hence if r is the radius of the target circle, then k = d/2r the radius of the target circle is d/2k.
The InspireX R50S 400 AFD (Adjustable Focal Distance) is an advanced single-beam solution able to detect contaminants on a wide range of can sizes.

Site: Follow: Share:
Open / Close