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reflection and is used for reflectance applications.
Use transmission mode for SpectroColorimetry. Use a white
light to reflect off of a white surface. Save this as the
reference. Then replace the white standard with a color
sample to measure. You will then see the spectral shape
for the color where the white standard displays as a
straight line at 100 percent.
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View -> Irradiance:
Watts per square meter (per nanometer)
Micro-Watts per square centimeter (per nanometer)
Micro-moles per square meter per second (per nanometer)
Lumen per square meter LUX (illuminance)
Lumen per square foot FC (footcandles)
These spectroradiometer display modes provide a calibrated Y
axis. In order to use this mode, the unit requires certain
system calibration files to exist. Units ordered as a
spectroradiometer include calibration files for operation
in this display mode. These files are installed by clicking
on the MyCal-nnnnn.exe file provided in the installation disk.
To get moles, watts is multiplied by 0.00835 (an Einstein),
which is a unit of energy in photochemistry, that represents
a Dose of power that irradiates a sample for 1 second. An
Einstein is the amount of enery in 1 mole (Avogadro's number,
6.0222 x 10^23) of photons. Another number displayed in this
mode is PAR, which stands for Photosynthetically Active
Radiation, and is the integral of power from 400-700nm in
micro-moles per square meter per second.
For the illuminace display, the photopic response curve is used
to formulate lumen per meter^2 which provides a LUX value.
The Irradiance calibration function located under the Apps
menu can re-generate system calibration files needed for
operating in Irradiance view mode. This requires a calibrated
source lamp with its calibration data stored in a disk file.
An example irrad cal data (text file) "NIST.icd" is
provided. This file can be used to simulate an irradiance
calibration and produce the required system calibration
files needed for selectiong the Irradiance view mode.
WARNING: the system irradiance cal files files such as
SW1.icf thru SW8.icf can be easily overwritten.
Like most instruments, it is good practice to re-calibrate
the spectroradiometer every 6 months.
Setup for Radiant and Luminous Flux Area in sq meter:
CR1............ 11 mm diameter -> sq meter
IC2............ 0.625 inch diameter -> sq meter
Other.......... user defined
Reset 1 sqm ... default area = 1 square meter
Radiant flux in watts = irradiance * surface area
Luminous Flux in lumen = illuminance * surface area
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