Illumination/Viewing System; Measuring Reflected Colors - Konica Minolta CM-3700A-U Instruction Manual

Illumination/Viewing System

Measuring Reflected Colors

The flow of measurement is shown below.
The geometry of the CM-3700A-U conforms to CIE No.15(2004), ISO 7724/1, ASTM E 1164, DIN 5033 Teil 7,
and JIS Z 8722 condition c (diffused illumination/perpendicular viewing system) standards, and offers both di:8°
(SCI: specular component included ; Total reflectance) and de:8° (SCE: specular component excluded ; Diffuse
reflectance) measurements. (SCI/SCE switchable)
① Illumination
Light from xenon
lamps diffuse in the
integrating sphere
and illuminate
the specimen
uniformly.
① Light from the pulsed xenon lamps are diffused by
reflection from the inner surface of the integrating
sphere, and finally illuminate the specimen uniformly.
② a. The light reflected by the specimen surface at an angle of 8° to the normal to the surface is received by
the specimen-measuring optical system and guided to the sensor.
b. The diffused light in the integrating chamber is received by the illumination-monitoring optical fiber and
guided to the sensor.
③ The light from the specimen-measuring optical fiber and from the illumination-monitoring optical fiber
is divided into each wavelength component and projected onto the sensor array sections, which
convert the light into proportional currents and output the currents to the analog processing circuit.
• By using the outputs from the specimen-measuring sensor and the illumination-monitoring
Memo
sensor for calculations, compensation for slight differences in the spectral characteristics
and intensity of the illumination light is performed (double-beam system).
② Receiving
a. Light reflected
by the specimen
are received.
b. Light diffused in the
integrating sphere
are received.
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③ Sensing
Light from the specimen-measuring and
illumination-monitoring optical fibers are
transmitted to sensors, where the light in
the wavelength range of 400 to 740 nm is
divided into 10 nm-pitch components and
projected onto the sensor array sections, which
convert the light intensity of each component
into proportional currents and output the
currents to the analog processing circuit.