C I N E B R A T E User Manual
14
During a measurement, the optical radiation (light) is sampled for a period of time determined by the Adaptive
Sensitivity
™
algorithm. Adaptive Sensitivity automatically determines the correct integration (exposure) time
based on the available signal. Following the light measurement, a measurement of the dark current of the
detector is made for the same length of time that was used for the light measurement. The dark measurement
is then subtracted from the light measurement yielding the contribution of light for each detector element.
FIGURE 14 - PR- / CINEBRATE SIMPLIFIED BLOCK DIAGRAM
FIGURE 15
–
CINEBRATE SPECTROMETER DIAGRAM
The uncorrected or ‘raw’ spectrum is corrected using factors established during the factory calibration of the
instrument. These factors include wavelength accuracy correction, spectral distribution correction and
photometric correction.
Next, the data is corrected by spectral factors. These factors insure that the spectral power distribution (SPD) of
the target and calculated values such as CIE Chromaticity are accurately reported. Lastly, a scaling factor
(photometric factor) is applied ensuring the luminance is displayed.
Spectrometer
CPU
128 detector array
Diffracted light
Diffraction
grating
Objective
lens
Aperture mirror
Optical
radiation
Input Slit
Grating
Incident light
