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Photometer instrument Britannica
WebA photoelectric flame photometer is an instrument used in inorganic chemical analysis to determine the concentration of certain metal ions, among them sodium, potassium, lithium, and calcium. Group 1 and Group … Photometers are used to determine the correct exposure in photography. In modern cameras, the photometer is usually built in. As the illumination of different parts of the picture varies, advanced photometers measure the light intensity in different parts of the potential picture and use an algorithm to determine the … See more A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum. Most photometers convert light into an electric … See more Most photometers detect the light with photoresistors, photodiodes or photomultipliers. To analyze the light, the photometer may measure the light after it has passed through a See more A reflectance photometer measures the reflectance of a surface as a function of wavelength. The surface is illuminated with white light, and the reflected light is measured after passing through a monochromator. This type of measurement has … See more Spectrophotometry in infrared light is mainly used to study structure of substances, as given groups give absorption at defined wavelengths. Measurement in aqueous solution is generally not possible, as water absorbs infrared light … See more Before electronic light sensitive elements were developed, photometry was done by estimation by the eye. The relative luminous flux of … See more Some photometers measure light by counting individual photons rather than incoming flux. The operating principles are the same but the results are given in units such as photons/cm … See more These are optical instruments for measurement of the absorption of light of a given wavelength (or a given range of wavelengths) of coloured substances in solution. From the … See more WebGet the best deal for Photography Light Meters from the largest online selection at eBay.ca. Browse our daily deals for even more savings! ... TTArtisan Light Meter 2 Dials Camera Lightmeter Photometer Photography Set-top . C $96.15. C $6.66 shipping. 17 watching. Estate Sekonic Marine Meter II AH-6. C $13.34. 1 bid. C $18.48 shipping. ntt-based fast lattice library
