Calibration, Maintenance, and Troubleshooting
StarBright User Manual
108
4.
Press
Modify
. The screen displays the
Original
(current) reading and factor (on the left side of
the screen), and
Updated
factor and its effect on the reading (on the right). The
Updated
box
is highlighted, indicating it is modifiable.
Figure
14-25 Modifying Calibration for Photodiode Sensors
5.
In the
Updated
area, use the Right/Left arrows to select the digit to update. Use the Up/Down
arrows to change the value of the selected digit.
6.
Press
Save
to save the settings and return to the main Measurement screen, which now
displays the updated Calibration Factor.
Figure
14-26 Updated Calibration Factor for Photodiode Sensors
7.
Press
Exit
to return to the Menu screen.
14.4
Calibration of Pyroelectric Sensors
14.4.1
Absorber Types Used in Ophir Pyroelectric Measuring Sensors
The main absorber surface types used in Ophir Pyroelectric measuring sensors include:
Metallic Type:
The type with no suffix in the name have a partially reflective multilayer
metallic coating which absorbs approximately 50% and whose absorption graph is shown in
. The metallic coating permits very high repetition rates, up to 25000Hz as
well as relatively high damage threshold.
Broadband Type:
The type with the BB suffix has a broadband absorbing coating to provide
high absorptivity from the UV through the IR. This coating can withstand energy densities, up
to 0.8J/cm² for short pulses and 2J/cm² for long pulses without changing calibration. The
absorption of this coating is above 90% for most of its range, as shown in