Patent
Acousto optic scanning laser vibrometer for determining the dynamic properties of an object
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TLDR
In this paper, an apparatus and method for using an acousto-optic scanning laser vibrometer for measuring a dynamic parameter of micro and macro components is disclosed. But the method is based on the phase shift between the laser beam striking on the object of investigation and the beam striking the reference surface due to the difference in the optical path.Abstract:
An apparatus and method for using an acousto optic scanning laser vibrometer for measuring a dynamic parameter of micro and macro components is disclosed. A coherent source of a laser beam of single wavelength and of stabilized frequency is split into two orthogonal polarized beams. One of the beams strikes the surface of investigation and gets reflected back, and the other polarized beam impinges on the reference surface and gets reflected back. The beam reflected from the surface of investigation and the beam from the reference surface are combined, thereby causing them to interfere. At least one photo detector is positioned at the point of interference. The photo detector output signals are input to a signal processor or phase meter to obtain the dynamic parameter information. Information is provided that is based on the phase shift between the beam striking on the object of investigation and the beam striking the reference surface due to the difference in the optical path. The information provided relates to the dynamic parameters of the object under investigation.read more
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References
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Patent
Scanning heterodyne acousto-optical interferometers
TL;DR: In this article, the authors proposed an in-line, almost common-path optical interferometer design that offers robustness to externally induced phase noise via mechanical vibrations, thermal effects, and other environmental effects.
Patent
Interferometric measuring method
Geunter Makosch,Bernhard Solf +1 more
TL;DR: In this paper, two radiation components differing from each other with regard to their state of polarization or their wavelength are directed onto closely adjacent points of the object to be measured, and the reflected components are recombined and fed to a polarization or wavelength-dependent phase shifter periodically shifting the phase positions of the two components by λ/2 against each other.
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Heterodyned self-mixing laser diode vibrometer
De Yu Zang,James E. Millerd +1 more
TL;DR: In this paper, the authors describe a method for remotely measuring vibration of an object based on laser Doppler vibrometry, which combines an external two-pass frequency shifting technique with self-mixed, heterodyne detection to provide a compact measurement system that requires only three optical components.
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Laser vibrometer for vibration measurements
TL;DR: In this article, a laser diode of a laser vibrometer emits light which is guided onto a polarization beam splitter by a lens 2 and deflected onto a mirror 3.
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Apparatus for measuring high frequency vibration, motion, or displacement
TL;DR: In this paper, a shared aperture design is employed for utilization of a flat target, double-pass design for large lateral movement tolerance with high resolution, and dual target design for detection of displacement as well as angular changes in vibrational motion.