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25 terms

Photonics Dictionary: P

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photographic dosimetry

The use of photographic emulsions to detect and determine the amounts of ionizing radiation, such as x-rays and gamma rays, in an area. This is accomplished by exposing the emulsion to the radiation...

photographic exposure

The product of exposure time and irradiance or illuminance.

photographic field

The maximum angle of view that can be recorded by a camera. Field is a function of lens focal length and film format.

photographic photometry

A form of photometric measurement, often used with light sources that are transparent or fluctuating, in which a photographic plate is used to obtain a record of a source's relative intensities over...

photographic radiometry

The use of photographic recording equipment to measure radiant energy. With this procedure, many measurements of radiant energy can be recorded simultaneously and permanently.

photographic resolution

A measure of the ability of a photographic system to record fine detail. Usually stated in terms of cycles per millimeter on the processed film.

photographic sensitometer -> sensitometer

An instrument for determining the sensitivity of a photographic film to light. The film is given either a stepped exposure or a continuously varied exposure; after processing, the density is measured...

photographic sensitometry

The measurement of the responsivity of photographic media and of the relations between exposure and density of developed images.

photographic shutter efficiency

A measure of the total light passed by a shutter during an exposure, compared with the light that could be passed by an idealized, infinitely fast shutter fully open for the same extreme time.

photographic sound recorder

A system in which the electrical signal embedded within an audio input signal is converted to a modulated light pattern and recorded on film.

photographic thermometry

The photographic recording of the heat radiation emitted from various points on the object as corresponding density variations on fast infrared film.

panchromatic photographic film

Black and white film that has a wavelength sensitivity similar to that of the eye.

Paschen-Runge mounting

A mounting used for large concave gratings, whereby the slit, grating and plate holder lie in the Rowland circle, and the photographic plates lie along a large portion of the circle. In this way, a...

phase hologram

A hologram that is formed on a recording medium by changing the phase of the illuminating wave in correspondence with the recording exposure. It may be formed by contact printing onto a resist...

phosphorography

A process used in pyrometry and photothermometry to create a photographic record of a surface's temperature gradients. Essentially, it involves the exposure of a glowing phosphorescent surface to the...

photocell -> detector

1. A device designed to convert the energy of incident radiation into another form for the determination of the presence of the radiation. The device may function by electrical, photographic or...

photoclinometer

A photographic recording instrument that measures deviation from the vertical of a drilled well or mine.

photoelectric densitometer -> densitometer

1. An instrument used to measure the opacity or density of dyes, pigments or dispersed particles that form an image in or on a medium, such as a photographic film. 2. A device used to measure the...

photoelectric exposure meter

A device consisting of a microammeter, a photovoltaic cell and a battery. It is used for the measurement of scene brightness and the determination of correct exposure for photographic processes.

photostore

The photographic recording of data, in binary form, for storage in memory. Exposure is achieved by a cathode-ray tube or by modulating a continuous-wave laser beam with a Kerr cell, both relative to...

pinhole camera

A lensless photographic camera that uses a small sharp-edged hole as its aperture. The light passed by this aperture onto the camera's film plane produces a soft-edged image that has a wide field of...

printer

A photographic enlarger with a fixed negative plane and a fixed paper plane, often using a roll of paper that is advanced automatically between exposures. The lens is interchangeable to suit a range...

process camera

A photographic camera designed to produce reproduction film of visual information (pictures, line drawings, graphs) for printing purposes.

projection printer -> printer

projection x-ray microscope

A microscope that uses an extremely fine x-ray focal point to produce an enlarged photographic image of a sample. Also known as an x-ray shadow microscope.

Photonics DictionaryP

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