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SD-OCT Base Unit Chapter 4: System Operation
Page 28 MTN012389-D02
Chapter 4 System Operation
4.1. Starting the System
Follow these steps for proper initialization of the system:
1) Start the base unit by placing the POWER switch to the “
I
” Position. Verify that the “POWER ON”
indicator turns green. Wait for 30 seconds until the PC has recognized the hardware.
2) Start the Thorlabs OCT software (see software user’s manual for details). The system will be switched
on via remote control from the computer. After starting the software, the green “SYS OK” LED on the
base unit will illuminate.
3) After loading the program, the software performs a warm up and initial calibration procedure. During
the warm up, the internal light source is off and the system performs a dark current measurement. Next,
the light source is switched on (“SLD ON” LED will illuminate) and stabilized with respect to temperature
and the related performance parameters. The warm up takes approximately 10 seconds to complete.
4.2. Basic Adjustments
When receiving a complete SD-OCT system from Thorlabs, the reference length is adjusted so that OCT
imaging in air is possible simply by adjusting the focus to the region of interest. If the reference arm length no
longer matches the sample arm length, the following procedure will aid you to a good basic adjustment. For
OCT imaging through refractive media, e.g. water or glass, please refer to chapter 4.3.2.
Adjusting the Focus
For a coarse adjustment of the focus, place a suitable sample, e.g. the IR viewing card delivered with the
system, underneath the scanner. Using the OCT software, a fraction of the card can be seen in the sample
monitor. Now, adjust the height of the imaging scanner with respect to the card by adjusting the focus block of
the OCT-STAND (see Figure 28) to obtain a sharp image.
Figure 31 Basic Focus Adjustment
off focus in focus