15
2.3
Sensor Functionalities
The CHRocodile CLS has two different measuring mode: Distance and Thickness measurement. The
principle of these two measuring mode are explained hereafter.
Mode 1
Chromatic Distance Measurement
Topographic, profile or roughness measurements are performed in Mode
1 (confocal distance measurement). In this process, 192 points along a
white light line are focused on the surface of the measured object using
an optic with a known chromatic aberration. The reflected light is more
intense for the wavelength in focus on the surface. For each of the 192
channels, reflected light is spectrally analyzed and the spectral response
is a peak centered on focused wavelengths. The 192 spectral peak
positions determine the distance to the surface of each of the 192 points
along the line. The 192 distances are simultaneously calculated and
transmitted to host computer at up to 2KHz frequency See
Fig. 2-3
. A
high frequency mode is now available to measure up to 6KHz. See
Section
2-7-2
.
Fig. 2-3: Chromatic measurement principle, distance measurement
Chromatic Optical Head
Содержание CHRocodile CLS0.2
Страница 7: ...7 8 3 Distance Measurement 71 8 4 Thickness measurement 72 Technical support 74 ...
Страница 63: ...63 Mechanical Plans 6 1 Optical Head Mechanical plans b CLS1 a CLS02 c CLS4 36 4 18 5 ...
Страница 64: ...64 Fig 6 1 Optical Head Mechanical plans a CLS0 2 b CLS1 c CLS4 d CLS2 3 d CLS2 3 ...