Primary Adjusting The Detection Channel - NT-MDT NTEGRA Spectra Instruction Manual

3.6. Primary Adjusting the Detection Channel

Primary adjusting serves for aligning the sample surface with the focal plane of the lens.
This procedure needs the sample to approach the probe to distance of 0.5 mm. Proper
focus of the lens on the sample surface is required for efficacy of collection and detection
of radiation transmitted through the sample.
To adjust primarily the detection channel, perform the following steps:
1. Direct the primary laser beam from the source to the radiation feedthrough by
changing adjustments of the spectral unit in the Control program (see manual on the
Control program).
2. Switch on the laser. Open the laser exit shutter. The laser beam will go through the
LBDS and the optical tube and come to the sample.
3. Decrease intensity of the laser beam coming from the LBDS to prevent overloading
the video camera. To this purpose, move the LBDS away from the axis of the laser
beam by rotating the adjusting screws of the radiation feedthrough (Fig. 3-15) until
the surface image on the monitor becomes contrast.
4. Using screws 1 and 2 (Fig. 3-16) of the positioning device, move the optical tube in
the XY plane so that the laser spot comes to the viewing field of the objective. The
monitor of the optical viewing system will display a smeared image.
Fig. 3-15. Radiation feedthrough
1 – horizontal adjusting screws;
2 – vertical adjusting screws
Chapter 3. Preparing for Operation
31