In cooperation with BMW, Steinbichler Optotechnik has developed a new ESPI system for applications with a CW-laser.

Under special consideration of laser safety requirements, the main emphasis had been put on a more user-friendly operation and a significantly improved image quality.

The measurement set-up consists of two system parts: the basic module which contains all optical parts that do not necessarily need to be integrated into the measurement head such as laser, beam splitter, or modulator. The other system component consists of the measurement head containing the objective lens, the reference fiber outcoupling with intermediate imaging, the CCD-camera, and the object illumination unit. The basic module and the measurement head are connected via two monomode fibers.

The basic module is completely encapsulated. Thus, it is secured that no laser beam will be emitted in this part. The Nd:YAG laser with a maximum power of up to 10 Watt with 532 nm (depending on model) is also integrated in the basic module. As the laser beam is split into object and reference beam in this unit, there is no integration of a beam splitter into the measurement head itself.

One of the most significant advantages of this new system is the high flexibility of the extremely compact measurement head the size of which has been reduced to a minimum without the loss of optical quality.

The standard version contains a zoom objective lens with a wide zoom range. Thus, it is possible to measure objects of various sizes even from different positions without the need of re-adjusting the measurement set-up.



 
by courtesy of PSA France



The FiberESPI system offers the following advantages for vibration analysis applications:

- compact measurement head with outstanding optical quality

- no re-adjustment necessary after changing the set-up

- high safety standard due to completely encapsulated laser beam

- multipanel measurement

- extremely flexible set-up and user-friendly operation

- integrated high-power CW laser