Optical Measurement
Non-contact motion analysis provides high-resolution data on surface displacement by tracking frequency shifts in backscattered light. Laser doppler vibrometry captures these mechanical oscillations to verify structural integrity in rigid substrates and micro-electromechanical systems. The process relies on the interference pattern between a reference beam and the light returned from a vibrating target.
Precise frequency modulation translates into velocity data across a wide dynamic range, allowing for the detection of sub-micron deviations during high-frequency resonance testing.
Signal Processing
Frequency domain analysis converts the raw interference signal into a velocity profile. The technique uses a photodetector to monitor the beat frequency generated by the overlap of the probe beam and the shifted return light. Sophisticated digital algorithms then separate the periodic movement from steady state noise.
Consistent sampling rates maintain coherence throughout long measurement windows. Engineers extract modal shapes from these outputs to map how energy propagates through an assembly. High sampling density ensures that aliasing artifacts do not contaminate the resultant spectral plots.
This capability allows for the identification of hidden cracks or loose solder joints inside sealed housings where physical probes prove destructive or impossible to deploy.
Fabrication Diagnostics
Mechanical validation in printed circuit board assembly requires tracking component jitter under thermal stress. The system records how heat cycles induce fatigue in structural solder joints by monitoring micro-vibrations across populated pads. Rigid enclosures often mask internal failures that manifest only under specific operational frequencies.
Direct observation of these deviations confirms whether design tolerances withstand predicted fatigue loads. Automated scan paths enable repeatable testing on complex boards to ensure that every critical area receives sufficient attention. Data obtained from these scans validates final performance requirements by proving the physical stability of components before they enter active service.
