Optics11 CHIARO NANOINDENTER, User Manual, Page: 17 / 65

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Figure 9: Set ‘Displacement control’ for automatic optical signal calibration .
Figure 10: DMA mode switch in profile configuration menu (left), ‘Scan OP1550 Wavelength’ for
automatic optical signal calibration (right).
Principle: The OP155 0’s internal laser wi ll tune its wavelength rapidly from ~1565nm to
~1525nm to create an interference pattern on the photodiode. As the photodiode s’
output voltage depends on the intensity of the interference pattern, an automated
offset and gain setting process is initiated, which optimizes the photodiode output for
the 0-10V range. The Piuma data acquisition system operates in the 0-10V range and
voltages outside this range cannot be collected.