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  2. Electronic speckle pattern interferometry - Wikipedia

    en.wikipedia.org/wiki/Electronic_speckle_pattern...

    Electronic speckle pattern interferometry (ESPI), [1] also known as TV holography, is a technique that uses laser light, together with video detection, recording and processing, to visualise static and dynamic displacements of components with optically rough surfaces. The visualisation is in the form of fringes on the image, where each fringe ...

  3. Laser Doppler vibrometer - Wikipedia

    en.wikipedia.org/wiki/Laser_Doppler_vibrometer

    A vibrometer is generally a two beam laser interferometer that measures the frequency (or phase) difference between an internal reference beam and a test beam. The most common type of laser in an LDV is the helium–neon laser, although laser diodes, fiber lasers, and Nd:YAG lasers are also used.

  4. List of types of interferometers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of...

    Linnik interferometer (microscopy) LUPI variant of Michelson; Lummer–Gehrcke interferometer; Mach–Zehnder interferometer; Martin–Puplett interferometer; Michelson interferometer; Mirau interferometer (also known as a Mirau objective) (microscopy) Moiré interferometer (see moiré pattern) Multi-beam interferometer ; Near-field interferometer

  5. Ground-based interferometric gravitational-wave search

    en.wikipedia.org/wiki/Ground-based_interfero...

    A laser is divided into two beams by a beam splitter tilted by 45 degrees. The two beams propagate in the two perpendicular arms of the interferometer, are reflected by mirrors located at the end of the arms, and recombine on the beam splitter, generating interferences which are detected by a photodiode. An incoming gravitational wave changes ...

  6. Self-mixing interferometry - Wikipedia

    en.wikipedia.org/wiki/Self-mixing_interferometry

    Set-up of a self-mixing interferometer with laser diode and monitor photodiode. Self-mixing or back-injection laser interferometry is an interferometric technique in which a part of the light reflected by a vibrating target is reflected into the laser cavity, causing a modulation both in amplitude and in frequency of the emitted optical beam.

  7. Velocity interferometer system for any reflector - Wikipedia

    en.wikipedia.org/wiki/Velocity_interferometer...

    Profile of a shockwave going through a solid, Adapted from Marc Meyers's "Dynamic Behavior of Materials". Velocity interferometer system for any reflector (VISAR) is a time-resolved velocity measurement system that uses laser interferometry to measure the surface velocity of solids moving at high speeds. [1]

  8. Holographic interferometry - Wikipedia

    en.wikipedia.org/wiki/Holographic_interferometry

    Since its introduction, vibrometry by holographic interferometry has become commonplace. Powell and Stetson have shown that the fringes of the time-averaged hologram of a vibrating object correspond to the zeros of the Bessel function (), where (,) is the modulation depth of the phase modulation of the optical field at , on the object. [1]

  9. Spectrum analyzer - Wikipedia

    en.wikipedia.org/wiki/Spectrum_analyzer

    A spectrum analyzer is also used to determine, by direct observation, the bandwidth of a digital or analog signal. A spectrum analyzer interface is a device that connects to a wireless receiver or a personal computer to allow visual detection and analysis of electromagnetic signals over a defined band of frequencies.

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