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Measurement of the interval during which a photodetector's signal and output current drops from 90 to 10 percent.
The divergence angle of a source, typically one constructed for use as a laser line generator, by the dimension of the line length. This angle defines how long the line will be at any given distance. Large fan angles lead to longer lines over shorter distances. Since the visibility of the laser line is directly linked to the density of light reaching the object being viewed or inspected, low power lasers should not be used to generate long lines.
The outer material that surrounds and protects the buffered and unbuffered fibers in an optical cable.
An optical instrument consisting of an objective lens, a coherent fiber bundle, and an eyepiece to examine the output of the fiber bundle.
See also Borescope
Interlaced imaging devices produce "live" video by scanning odd-numbered lines in the first pass, then even-numbered lines in the second pass, and so on. Two fields equal one frame.
A type of optical aberration that results from a flat object being imaged onto a curved surface. Knowing the parameters of the flat object and the curved surface allows one to factor out field curvature through software manipulation, resulting in an accurate representation of the object rather than a distorted one.
See also Aberration
An imaging lens's ability to accommodate a large sensor (image), source (object), or angular field of view (in afocal systems).
One of several basic parameters in a video system, it defines the rectangular area of the viewed object that is displayed on the screen (monitor, human eye, etc). FOV depends on the angular magnification of the optics in front of the camera, and on the linear magnification, or ratio of screen size to sensor format size. Often only horizontal FOV is listed because it is a simple calculation, governed by a 4:3 ratio, to find vertical once it is known.
An optical component that allows certain wavelengths or frequencies of light to pass through while reducing or absorbing all others. Types of filters include bandpass, longpass edge, shortpass edge, notch and rugate notch, color and dichroic filters, and neutral density.
See also Hot Mirror, Bandwidth, Cold Mirror, Cut-Off Wavelength, Cut-On Wavelength, Heat Absorbing Glass, Shortpass Filter, Stopband, Cavity, WRATTEN Filter, Rugate Notch Filter, Peak Transmittance, Interference Filter, Central Wavelength (CWL), Dichroic Coating, Longpass Filter, Full Width at Half Maximum (FWHM), Neutral Density Filter, Dichroic Filter, Notch Filter, Fluorescent Filter
A type of ball bearing stage drive mechanism option. The 64 pitch screw is used for fine resolution positioning, but the head is not labeled for position readout.
A conjugate distance relationship in which light is focused from a source (not at infinity) down to a spot. In terms of imaging, the object is placed a finite distance from the optical elements and imaged a finite distance onto a sensor or other image plane.
A type of mirror featuring a high reflectivity coating, such as metallic or multi-layer dielectric, deposited on one surface of the glass substrate, or the front surface. Light does not pass through any glass before it is reflected, but the coating is not protected and is more prone to scratching and oxidization.
See also Dichroic Coating
For ball bearing stages, it denotes error in the vertical plane (up and down movement in direction of travel).
One of two types of optical glass used in the manufacturing of achromatic lenses. Flint glass has higher dispersion and higher index of refraction than crown glass.
Glass manufactured by the float process, which involves floating glass on liquid tin as the glass cools.
A type of filter that absorbs light at short wavelengths (excitation wavelengths), typically in the ultraviolet (UV) spectrum, and emits light at long wavelengths (emission wavelengths) in the visible spectrum.
Also known as a Nikon F-mount bayonet, it is a camera and lens standard with a 46.51mm flange distance.
The distance range through which a laser diode module can be focused to achieve an ideal spot size. Typically specified from the face of the module to past collimation. Although a laser diode module can be used at distances shorter than the minimum focusing range, it's spot size will be larger than the focused spot at this minimum distance. It is important to note that the focused spot size will increase with distance from the module. At long distances, the optimum focus condition is a collimated beam with minimum divergence.
Unit of illuminance equal to one lumen per square foot. One footcandle (fc) equals 10.764 lux.
Interlaced imaging devices produce "live" video by scanning odd-numbered lines in the first pass, then even-numbered lines in the second pass, and so on. Each frame is comprised of two fields.
The number of full frames (which may consist of two fields) composed in a second. In high-speed applications, it may be beneficial to choose a faster frame rate to acquire more "images" of the object as it moves.
The number of wave crests that pass a fixed point in a given unit of time. In electro-optics, it is expressed in hertz or cycles per second.
A type of lens manufactured using a molding process that results in annular rings (or grooves) in thin plastic or acrylic. Each groove refracts the light as if it were a part of a whole conventional lens. The result is a lighter lens that can have a lower f/# than a conventional glass lens of the same focal length. The original design for this type of lens was made by A.J. Fresnel for use in lighthouses.
A type of optical lens assembly designed to provide a flat field at the image plane of the scanning system. It is commonly used in laser marking, engraving, and cutting systems in conjunction with a beam expander and galvanometer.
A specific wavelength region of the bandwidth of a filter defined by the two points of the passband where transmittance is 50% of the peak.