Polytec OFV-3001, User Manual

Page: 46 / 101

5-4
5 Operating the Vibrometer
5.5 Exchanging the Front Lens
OFV-303/-353 By using different front lenses for the sensor head the vibrometer can be
optimally adapted to the different ranges of stand-off distance. The standard
front lens OFV-MR (mid range) is suitable for stand-off distances from 175 mm
to over 10 m. The ideal front lens for short range OFV-SR (short range) has
been optimized for distances from 65 mm up to 5 m. For long range from
450 mm to over 100 m the front lens OFV-QR (long range) should be used.
A label on the side of the sensor head shows the front lens model which is
fitted.
The components of the front lens mount are shown in figure 5.1 .
To exchange the front lens, proceed as follows:
1. Turn the threaded cover 5 anti-clockwise until it can be removed.
2. Remove the mount 4 for the
λ
/ 4-plate and put it to one side.
3. Pull the front lens 3 out of the lens mount 1.
4. Carefully put the new front lens into the lens mount. Turn it in the lens
mount until the pin 2 slots into place.
5. Put the
λ
/ 4-mount 4 in the lens mount in such a way that the pin slots into
place in the slit in the
λ
/ 4-mount.
6. Turn the threaded cover 5 on the lens mount until it is securely seated.
7. Exchange the label for the front lens model on the side of the sensor
head.
OFV-511/-512 Exchange of the mini sensors with fiber heads is described in section B.3 .
Figure 5.1: The components of the front lens mount
1 2 3 4 5
Caution !
Make sure that everything is kept clean and take great care when exchanging the front lens
so that no dirt gets into the housing and the optical components are not damaged !