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Solar
Spectrum Reflectometer Model SSR
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on the image for a larger view)
The Solar Spectrum Reflectometer, Model SSR-ER version 6
features a selectable solar measurement spectrum matched
to a variety of standard global and beam normal solar
irradiance models. The SSR provides accurate
measurements on both diffuse and specular materials,
even second surface reflectors up to 0.25 inches (6.4
mm) thick. Solar reflectance or absorptance is displayed
to 0.001 units, with a repeatability of 0.003 units. For
detailed information on the technical aspects of the
instrument, refer to Tech
Notes 79-16, 83-1, 86-1, and 09-1.
Key Features
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To
match various solar irradiance reflectance values,
two “virtual” detectors are added to the four actual
detectors. The four actual detectors cover broad
wavelength bands roughly centered on the UV, Blue,
Red and IR. The two virtual detectors are added by
resampling the Red and IR detectors at a lower lamp
color temperature. With effectively six detectors it
is possible to generate a good match to a variety of
solar irradiances. For typical global and direct
irradiances, the SSR reflectance readings match
calculated reflectance based on spectrophotometer
readings with a bias of less than 0.002 and a
standard deviation of about 0.005. |
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Calibration
and adjustment of the measurement spectrum against
one of the supplied standards is accomplished with a
single key stroke. Calibration data for up to five
additional standards can be saved in memory,
permitting the use of working standards other than
those supplied. |
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A
'hold' function that freezes the current reading can
be initiated from the keypad. This is useful for
applications that require the measurement head to be
handheld. It also allows reflectance or absorptance
for different solar irradiance matches to be
displayed for a single measurement. |
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Firmware
supports a number of operating modes including sample
and hold versus continuous sampling, auto or manual
send of reflectance data to the serial port and
emulation of version 5 reflectance readings. |
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Along
with the three calibration standards supplied with the
instrument, four additional color tile standards are
supplied to track the color temperature calibration of
the instrument. These tiles are selected to have
monotonically increasing or decreasing reflectance
over the wavelength range of one or more of the
detectors. |
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