Table of Contents
Advertisement
Chapter 4. Performing Measurements
Tuning the photodiode position
With the delivery channel adjusted, align the photodiode as follows:
Aiming
1. Switch to the
tab with the
button in the Main Operations panel.
2. Rotate the photodiode positioning screws 4 and 5 (Fig. 4-12) to place the laser spot
position indicator at the center of the photodiode indicator (Fig. 4-14).
Fig. 4-14. Laser spot adjusted at the center of the photodiode
3. Close the feedback loop by pressing the
button.
4.3. Scanning
Before taking a scan, turn off the illuminator and all sources of ambient light in the work
room and close windows of the room with dense curtains to protect the PMT from any
undesirable interference.
Scanning includes two stages. First, scanning-by-laser of the probe interior is used to
align the laser beam at the center of the probe aperture. Then, the surface landscape and
the transmitted light intensity distribution are measured with scanning-by-sample.
Scan(Slave)
Scanning-by-laser uses the
tab while scanning-by-sample uses one of the
Scan(Master)
Scan
Scan
tabs
or
. Here, scanning-by-sample will be explained with the
tab.
47
- Quick Links:
- Overview
Hide quick links:
Advertisement
Table of Contents
