As shown in the sample calibration curve shown
below (Figure 3), the measurement range is
divided into several individual measurement
ranges. The calibration curve is expressed as a
combination of the individual calibration curves in
each measurement range.
memory. During measurement, the detector output
is read in and then the thickness is calculated from
the stored calibration curve and output in the form
of analog or digital signal.
The microcomputer has a state-of-the-art 32-bit
microprocessor for high-speed calculations.
Specifications
General Specifications
Measured materials: Mild steel strip
Detector
output
Measurement range: 1.00 to 16.00mm
(0.85 to 17.92mm pure steel equivalent)
Range for setting compensation:
± 15.00% (based on pure steel)
Range 0 Range 1 Range 2 Range 3 Range 4 Range 5 Range N
Setting accuracy:
± SQRT [(linearity)2 + (reproducibility)2 +
(noise)2]
This is the accuracy when a test sample for
accuracy test is used offline.
Measuring air gap height of 750mm and time
constant of 30ms.
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ
→
Thickness
Figure 3
Calibration Curve
The X-ray generator, detector and other electrical
circuits on the X-ray thickness gage are subject to
drift as time passes, so the gage must be calibrated
at periodical intervals. Two calibration methods
are used for this purpose: Full calibration (in
which all calibration curves in the entire
Linearity: Max. ± 0.1% of set thickness (2σ)
Reproducibility:
Max. ± 0.05% of set thickness or ± 0.05µm,
whichever is greater (2σ)
Noise:
measurement range are recreated) and Calibration
(in which the calibration curve in only one
Thickness(mm)
Noise(%)
Max.±0.12%
Max.±0.20%
Max.±0.24%
(1.65σ)
measurement range is recreated). Full calibration
requires about two minutes and calibration
requires about five seconds. This combination of
two calibration methods is a unique Toshiba
innovation unlike the methods used by any other
company. As the calibration curve is created by
predetermined calibration points, Full calibration
can be performed regardless of settings.
1 to 7.99
8 to 13.99
14 to 15.99
Drift:
Max. ± (0.2% of set thickness + 0.5µm)/8h
Measuring head
Using these two calibration methods, it is possible
to, for example, perform Full calibration two to
three times daily to maintain the measurement
accuracy in the measurement range, and perform
calibration near the nominal thickness during the
short period of time when no strip is present in the
X-ray beam (such as during coil changing, etc.) to
eliminate drift. This allows setup to be performed
with great precision when the strip is present in the
X-ray beam.
Changes in air density to max. cooling water
temperature variations ± 3°C and max.
temperature variations around measuring
head ± 5°C are not included.
Max. temperature variations around
equipment cabinet/driving control box ± 5°C.
Response time:
Max. 30ms (response 63% when thickness of
2mm is changed in 100µm increments)
Calculation period: 10ms
Calibration time:
When the calibration curve is created, standard
plates are automatically inserted, the detector
output is read in and the calibration data is
calculated and stored in the microcomputer
For full calibration
For calibration
Max. 150s
Max. 5s
For setup
Max. 20ms
No. EJD-069
4
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