An aperture consisting of a semitransparent central region whose amplitude transmittance only is varied, and the relative phase difference between the central and annular region is fixed as p - difference.

The logarithm of the reciprocal of diffuse transmittance. Diffuse density results when a sample is diffusely illuminated.

A term describing a substance that is impervious to light; the characteristic of a substance that has no luminous...

A measure of the transmittance through an optical medium. Optical density equals the log to the base 10 of the reciprocal of...

Measures the absorption or sample transmittance over a range of specified wavelengths. Sample may be placed within the...

The greatest luminous transmittance possible for a specified chromaticity.

The face of a cathode-ray tube (CRT) that has a fiber optic sheet attached to its surface. The sheet's fibers are at right...

See regular transmittance; the term specular is not properly applied to transmission.

A computer-generated, phase-and-amplitude, off-axis hologram made by a multi-exposure technique that uses three computer...

With reference to absorbance, absorptance, transmittance and the like, the processes occurring within a specimen between the...

Transmittance of a solution, or internal transmittance of a transparent solid, is an exponential function of the thickness...

A television system that uses a slow rate of horizontal scanning to increase its reproduction and transmittance accuracy of...

The ratio of the radiant power transmitted by an object to the incident radiant power.

Average wavelength usually determined for light-transmitting devices by taking a weighted average for each wavelength of the...

The detection and measurement of spectral reflectance, spectral transmittance or relative spectral emittance, relative to...

An instrument that uses optical filtration in order to measure the transmittance for a discrete range or specific number of...

Transmittance of a stable solution is an exponential function of the concentration of the absorbing solute.

The part of incident flux that is transmitted with no scattering.

The output of spectral channels written as an integral function of known solar irradiance, atmospheric transmittance and...

The ratio of the radiant power transmitted to the second surface of a medium to the corresponding radiant power that has...

A measure of a material's inability to transmit light, equal to the reciprocal of its transmittance.

An electrostatic device that uses an electric potential barrier to allow the transmittance of electrons at or above a set...

A wavelength region of relatively high transmittance, surrounded by regions of low transmittance.

A hologram having an object wave that has been transmitted through the transparent object media to a mirror, reflected again...

A hollow sphere coated internally with a white diffusing material and provided with openings for incident beam, specimen and...

A spectrophotometer is a scientific instrument used to measure the intensity of light at various wavelengths in the...

Also known as UV-VIS spectrometer, a device that measures the absorbance, reflectance or transmittance of light in the...

A type of modulation spectroscopy that measures spectral reflectance or transmittance changes induced by applying a...

Photocells of various kinds used to measure photometric quantities; i.e., intensity, luminance and illuminance. Meter...

The spatial distribution of incident and collected flux contained in the analysis of reflectance, transmittance or densities.

A spectrophotometer in which the beam emitted by the radiation source is split into beams that travel through the sample and...

An optical wedge in which transmittance or density is a function of the location of the wedge, relative to a specific...

The apparent luminance of the image as seen through an optical system. This brightness of the image is determined by the...

A colorimeter is a device used to measure and quantify the color characteristics of an object or a light source. It provides...

A viewer that uses the transmittance of polarized light through glass or a similar medium to examine strained regions. See...

The equivalent f number of a fictitious lens that has a circular opening and 100 percent transmittance, which would give the...

Conceptual formulas that characterize both the transmittance functions of lenses and propagation in the Fresnel zone.

The transmittance of a point on a photographic negative equal to the log to the base 10 of the reciprocal of the...

The internal transmittance per unit thickness of a nondiffusing material.

The observed time dependence of the transmittance of a step of radiation through a given medium.

The ratio of diffusely transmitted flux to incident flux.