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Illumination/Viewing System
Measuring Reflected Colors
The flow of measurement is shown below.
The geometry of the CF-300 conforms to ISO 7724/1 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 the LED
diffuses inside the
integrating sphere
and evenly illuminates
the specimen.
①
Light from the LED diffuses inside the integrating sphere by reflecting off the internal walls, and evenly illuminates
the specimen's surface.
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.
Memo
By using the outputs from the specimen-measuring sensor and the illumination-monitoring 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.
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.
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