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2.5 Measuring
In this chapter, a measurement example will be described. Please use the example as a reference
when you use this instrument.
2.5.1 Measuring Directional Light Sources
When measuring a light source with directivity (for example, LED) or a light source with unevenness,
use a white board for measurement as shown in the figure. If you observe the light source directly,
sometimes you cannot obtain the data with good repeatability.
2.5.2 Measuring Very Small Surfaces
When measuring a smaller sample than the instrument’s measuring diameter, use the attachment lens,
which is an optional accessory. There are two t
ypes of attachment lens, “AL-6” and “AL-11”.
Measuring diameter of SR-NIR:
☞
“Specifications and Performance” of “6. Appendices”.
Use the screw at the objective lens end of this instrument to connect the attachment lens.
When using the attachment lens, it is necessary to set the correction factor in the instrument.
Setting the correction factor:
☞
and “3.10 Display/Change of Correction Factor”.
The measuring diameter of each measuring angle is shown in the tables below.
In the case of AL-6
In the case of AL-11
Measuring
angle
Measuring diameter (mm)
Measuring
angle
Measuring diameter (mm)
2°
2.00
–
2.88
2°
1.18
–
1.53
1°
1.00
–
1.44
1°
0.59
–
0.76
0.2°
0.20
–
0.29
0.2°
0.19
–
0.15
0.1°
0.10
–
0.14
0.1°
0.06
–
0.08
* Measuring distance: 51.72
– 68.53mm
(from the hardware tip)
* Measuring distance: 19.56
– 24.80mm
(from the hardware tip)
Light source
White board
SR-NIR
