Feature sponsored by Test & measurement
WAVEFRONT MEASUREMENT SYSTEMS AND MODULES FOR OPTICS TESTING
M
icro-Epsilon has introduced a range of wavefront measurement systems and modules for optics testing. Based on the SHSLab range of Shack-Hartmann wavefront sensors from Optocraft – a member of the Micro-Epsilon
group of companies since 2018 – SHSInspect is a range of turnkey wavefront measurement systems, measurement modules and automated software tools for a wide variety of applications in optics and optical systems, including objective lens testing, testing of optical elements and windows, surface shape measurement and inline measurement and automation.
TURNKEY SOLUTIONS Two configurations of SHSInspect are available: with SHSInspect 1Xpass, the measurement beam is transmitted through the test specimens only once, while with the SHSInspect 2Xpass, the light is reflected back after the first transmission by a mirror and passes through the test sample twice. One advantage of SHSInspect 2Xpass is that the effect of the test specimen on the wavefront is doubled. This means the measurement sensitivity is increased, which enables extremely precise measurements. As a result of the optical layout, the whole measurement configuration can be calibrated simply by means of a plane mirror and a reference sphere.
FLEXIBLE AND EASY TO INTEGRATE
SHSInspect can be easily integrated into an automated production environment and measures in real time in terms of the production cycle. Depending on sensor size, the SHSInspect 1Xpass and 2Xpass systems reach frame rates between 1 and 50Hz – in special applications even up to 1,000Hz. Ultimately, the time required to insert the test specimen into the measuring equipment determines the measuring rate.
SHSInspect systems can achieve very high
accuracy and sensitivity, even in harsh conditions. The pure sensor head (SHSCam HR) achieves a typical base accuracy
(uncalibrated) of λ/15 PV. Depending on the optical structure of the test system, even higher precision can be achieved using suitable calibration measures. In the case of the
SHSInspect 2Xpass system, a value of λ/20 PV has been proven in direct comparisons with a Fizeau interferometer.
CUSTOM, MULTI-FUNCTIONAL SYSTEMS
SHSInspect can be considered as a platform that is optimally adapted to the requirements of the customer. The system is flexible and more cost effective than an interferometer, while covering a wider functional range. On-
70 October 2022 Instrumentation Monthly
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