optical axis


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Related to optical axis: focal length, visual axis

optical axis

The imaginary line passing through the midpoint of a lens, mirror, or system of such elements and on which lies the focal point of parallel paraxial rays.

Optical Axis

 

The optical axis of a lens or a concave or convex mirror is the straight line that is the axis of symmetry of the refracting surfaces of the lens or of the reflecting surface of the mirror. It passes perpendicularly through the center of these surfaces. Optical surfaces that have such an axis are said to be axially symmetric. The optical axis of an optical system is the common axis of symmetry of all the lenses and mirrors in the system.

optical axis

[′äp·tə·kəl ′ak·səs]
(anatomy)
An imaginary straight line passing through the midpoint of the cornea (anterior pole) and the midpoint of the retina (posterior pole).
(optics)
A line passing through a radially symmetrical optical system such that rotation of the system about this line does not alter it in any detectable way.

optical axis

An imaginary line drawn from the geometric center of a film to the center of a lens. It may project beyond the lens. Also called a lens axis and a camera axis
References in periodicals archive ?
The use of laser telemeter leads also to the increase of accuracy which permits continuous measurement and maintenance of the distance between spectral source of emission and spectrometer, with the same telemeter being possible to centre the optical axis of spectrometer on the maximum spectral emission zone.
Also, if the camera optical axis is perpendicular to the marker direction, virtual objects are chattered because of problems caused by formula for digital image processing.
instant position of the characteristic point relative to the intersection of the optical axis of the sensor with the characteristic point plane [x.
Highly reliable sleeve mechanism enables connection of an objective lens unit and prism unit to minimise optical axis deviation;
The approach, which makes it possible to consider the current orientation of the optical axis of mobile telecamera, is proposed in the paper (Murao et al.
We could not place the optical axis precisely in the center of the Digital ELPH yet we knew we had to find a way to incorporate the ELPH models' key motif without sacrificing the camera's sense of balance," Omino revealed.
The emergent laser beam has to remain parallel to the optical axis (O.
The unit detects and calculates a range and direction of the impulse sound source; slews the camera to align its optical axis with a direction of the impulse sound; determines whether the impulse sound was a gunshot; records images of the source area; and alerts neighboring units to initiate recording of images.
Beyond this lens there is on the optical axis focal point D as the common point of the lens K and the objective O1.
These lightweight lenses have external exit pupils and can be used to select arbitrary focal length, match spot size to detector size, align a laser beam to the axis of a lens assembly and accurately collimate light exiting an optical fiber in a parallel direction to the optical axis.
The system delivers precise, reliable optical axis alignment, and it is easy to operate.
This new invention describes a method for uniquely and unambiguously aligning a patient's visual line of sight to the optical axis of an ophthalmic instrument such as may be used in laser surgery or diagnostics.