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  • BTS256-E WiFi Light Meter
Jun 2014
Gigahertz-Optik Inc.Request Info
NEWBURYPORT, Mass., June 27, 2014 — A WiFi interface has been added to the BTS256-E light meter from Gigahertz-Optik, allowing wireless control of all meter functions to characterize long-distance light sources from a central location.

The BTS256-E WiFi measures fifteen different quantities, including photopic and scotopic illuminance, S/P ratio, Equivalent Visual Efficiency factor, color coordinates, CT, CRI, color purity, deltaUV and spectral irradiance. A Bi-Technology sensor includes a precision photometric photodiode and diode array spectrometer.

Any spectral mismatch error of the photopic sensor is compensated on-line using the diode array’s measured spectral data. This reduces measurement uncertainty when evaluating light sources. A built-in electro-optical shutter for dark-signal pixel offset compensation optimizes signal-to-noise ratio to increase the linear dynamic range of the C-MOS diode array detector.

Applications include lighting design, engineering, manufacturing and maintenance.


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The attribute of visual experience that can be described as having quantitatively specifiable dimensions of hue, saturation, and brightness or lightness. The visual experience, not including aspects of extent (e.g., size, shape, texture, etc.) and duration (e.g., movement, flicker, etc.).
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 visual means. 2. A device that provides an electric output that is a useful measure of the radiation that is incident on the device.
A two-electrode device with an anode and a cathode that passes current in only one direction. It may be designed as an electron tube or as a semiconductor device.
Luminous flux incident per unit area of a surface; luminous incidence. (The use of the term "illumination" for this quantity conflicts with its more general meaning.)
Radiant flux incident per unit area of a surface. Also called radiant flux density.
Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
Pertaining to optics and the phenomena of light.
Pertaining to the measurement of the intensity of light.
Contraction of "picture element." A small element of a scene, often the smallest resolvable area, in which an average brightness value is determined and used to represent that portion of the scene. Pixels are arranged in a rectangular array to form a complete image.
1. A generic term for detector. 2. A complete optical/mechanical/electronic system that contains some form of radiation detector.
A mechanical or electronic device used to control the amount of time that a light-sensitive material is exposed to radiation.
A physical source of radiation, as contrasted to illuminant. See illuminant.
Pertaining to or as a function of wavelength. Spectral quantities are evaluated at a single wavelength.
A kind of spectrograph in which some form of detector, other than a photographic film, is used to measure the distribution of radiation in a particular wavelength region.  
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