INST.No.INE-510-P6
-8-
Considering the dislocation of the optical axis, take the measuring area more than 1.5
times the measuring diameter.
At focusing position of object lens, the relation of measuring distance and the measuring diameter are
defined by the distance factor as shown in the following formula.
In case of IR-SA, distance factor and focusing position of object lens are shown in model name, the
number of next beginning of alphabet shows it, and next number shows focusing position of object
lens.
In position that does not focus, the relation of measuring distance and the measuring diameter are
different. In this case, the relation of measuring distance and the measuring diameter are defined as
shown in the following formula, assumed distance of focusing position of object lens from the
thermometer is A, measuring diameter at focusing position is B.
It is an upper figure to have shown these expressions of relation s to the figure. 10 of the whole
expression of relations is an object lens diameter.
Place the thermometer at the measuring distance, confirmed measuring diameter by an upper figure or
formula.
Measuring diameter (mm) = Measuring distance (mm)/distance factor
IR- SAS
□ □
N
Distance factor
1=100, 2=200
Focusing position of object lens 0=500mm, 1=1000mm, 2=2000mm
5=5000mm, S=200mm
When measuring distance is nearer than the focusing position of object lens
Measuring diameter = ( B – 10 )×Measuring distance /A + 10
When measuring distance is longer than the focusing position of object lens
Measuring diameter = (B + 10 ) ×Measuring distance /A – 10
Unit (mm)
Reference
