Description

Tempo 1D

Ultra High Frequency Measurement All Surface Types

Ultra-High Frequency Interferometry

The cornerstone of the Tempo 1D’s exceptional performance is the two-wave mixing (TWM) approach to laser
interferometry utilizing a photorefractive crystal, offering unmatched combination of precision, adaptability, and
reliability. Optimized for light-scattering surfaces, the design offers a high field of view to collect a large number
of speckles. Together with its high sensitivity, it is an ideal choice for laboratory non-destructive testing.

Adaptive Beam Splitting

In TWM, the reference and sample beams are combined in the photorefractive crystal to form a realtime hologram. The photorefractive crystal acts as an
adaptive beam splitter, combining the reference and signal beams with exact wavefront matching. It compensates for slow variations in the signal beam’s wavefront, crucial for maintaining accuracy in measurements. Quadrature biasing, achieved through the application of a high-voltage DC electric field, ensures linear detection of transient phase-modulated signals, enhancing the strength of real-time holograms.

Performance and Reliability

The Tempo 1D harnesses the high-performance of photorefractive crystals, meticulously selected for their reliable properties to optimize the TWM process. Through decades of extensive research and development, photorefractive TWM has evolved into a reliable technology, guaranteeing consistent and precise measurements across a wide range of applications.

Application Examples

This technology has been applied in various fields, including:

• Measurement of carbon fiber volume fraction within a composite laminate. (https://doi.org/10.1177/00219983211011229)
• Noncontact measurement of inner cracks in thick aluminum specimen. (https://doi.org/10.1016/j.ndteint.2020.102273)
• Fatigue crack detection. (https://doi.org/10.1016/j.optlastec.2011.04.003)
• Characterization of roll-cladded aluminum plates. (https://doi.org/10.1115/QNDE2021- 74927)
• Online cracking detection during laser‐cladding process. (https://doi.org/10.1002/stc.2291)