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photometer Dictionary Terms

infrared spectrophotometer
A spectrophotometer having a prism or, more frequently, a grating for the study and recording of infrared spectra. It...
flicker photometer
A bench photometer that depends on the inability of the eye to distinguish color in brief flashes of light. Any difference...
absorption spectrophotometer
Measures the absorption or sample transmittance over a range of specified wavelengths. Sample may be placed within the...
isophotometer
A direct recording photometer that is designed to scan a photographic negative to determine its points of isodensity.
microspectrophotometer
A specialized spectrophotometer for use through a microscope on very small areas of an object.
Bunsen screen
A photometer screen that contains a diaphragm of paper or parchment with a translucent central spot of oil or paraffin.
ultraviolet spectrometer
A spectrophotometer designed for use in the 200- to 380-nm range of the electromagnetic spectrum and equipped with a...
telephotometry
The principles and techniques involved in the use of telephotometers to measure atmospheric extinction.
spectrophotometer
A spectrophotometer is a scientific instrument used to measure the intensity of light at various wavelengths in the...
Koenig-Martens spectrophotometer
A visual, single-unit spectrophotometer with a biprism and a Wollaston prism. The Wollaston prism polarizes coincident...
photoelectric photometer
Also known as electronic photometer. A photometer with a photocell, phototransistor or phototube for measuring the intensity...
wedge photometer
A photometer that uses a wedge, marked to show its reduction of flux density, to make two light sources equal in intensity...
laser-light-scattering photometer
A scattering photometer using scattered light in the solid angle 4.51+0 19° with respect to the forward direction, and...
visibility meter
1. An instrument used to determine the visual range in an environment. 2. A type of photometer that artificially reduces an...
glossmeter
A photometer for measuring gloss by comparing the specular reflectance to that from a perfect specular reflector.
photometer
A device used to compare the luminous intensities of two sources by comparing the illuminance they produce.
luminance meter
A type of photometer calibrated in luminance units (candles per square unit, or lamberts). In photography an exposure meter...
optical manufacturing tools and machinery
Optical manufacturing tools and machinery encompass a wide range of equipment, instruments, and systems used in the...
spot photometer
 Huefner spectrophotometer
A visual spectrophotometer with a rhomb located directly before the entrance aperture of a constant-deviation...
abridged spectrophotometer
An instrument that uses optical filtration in order to measure the transmittance for a discrete range or specific number of...
bench photometer
A device used to compare the luminous intensities of two sources by locating a point between the two light sources where the...
Glan spectrophotometer
A device similar to the ordinary spectrophotometer but containing particular modifications to provide for the comparison of...
spectral repeatability
Spectral repeatability refers to the consistency and reproducibility of spectral measurements across multiple trials or...
visual photometer
A photometer that permits visual comparison of the luminance of two surfaces.
monochromator
A monochromator is an optical instrument used to isolate and select a narrow range of wavelengths from a broader spectrum of...
photoelectric spectrophotometer
A system that consists of a spectrophotometer with a photoelectric detector for measurement of radiant energy.
reflectance spectrophotometer
An instrument that spectrally analyzes the flux reflected from a material. The reflected flux may be total, diffuse or...
photoemissive tube photometer
A photometer that uses a photoemissive tube to detect and measure light. See photoelectric photometry.
gegenschein-zodiacal light photometer
A photometer used to measure sky brightness and polarization associated with zodiacal light, background starlight, F-region...
Dobson spectrophotometer
A spectrophotometer that measures the amount of ozone in the atmosphere through a comparison of solar energy at two...
spectrochemical equipment
Equipment used for chemical analysis by investigation of the spectra formed and observed in chemical activity. Of particular...
double-beam spectrophotometer
A spectrophotometer in which the beam emitted by the radiation source is split into beams that travel through the sample and...
filter spectrophotometer
A spectrophotometer that makes use of filters to isolate narrow bands of the spectrum.
flame photometer
Any of a number of instruments that uses a flame to vaporize a solution of the chemical being analyzed so that light may be...
photoelectric reflectometer
A photoelectric photometer used to measure the reflectance of a surface.
photometric cube
A prism used in a photometer for the adjacent comparison of separate luminance.
goniophotometer
A device used to measure directional reflectance, with light collection restricted to a narrow range of angles of which the...
light meter
Any device that is used to sense and measure light. See exposure meter; photoelectric exposure meter; photoelectric...
microphotometer
An instrument capable of measuring the transmitted or reflected luminance from a very small area seen under a microscope....
spectroreflectometer
A spectrophotometer specially designed to measure spectral reflectance.
electronic photometer
telephotometer
An instrument used to measure the luminance (brightness) of a distant object. The object is viewed through a small...
colorimetric photometer
A photometer that uses a set of color filters to measure the intensity of light in various regions of the spectrum.
polarization photometer
A photometer having a pair of Nicol prisms introduced into the beam from the brighter of two sources to be compared. Turning...
Brace-Lemon spectrophotometer
A spectrophotometer having a pair of identical collimators with two Glan polarizing prisms, one fixed in azimuth and the...

(46 results found)

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