A systematic approach to TV holography

Abstract

Television holography (TVH) can be defined as 'the family of optical measurement techniques based on the electronic recording and processing of holograms'. Image-plane TVH was introduced in the early 1970s with the name 'electronic speckle-pattern interferometry' (ESPI). Since then, TVH has undergone an impressive development and become one of the most promising optical techniques for non-destructive testing and industrial inspection. The aim of this review is to propose an original scheme for the systematic treatment of TVH and to review the existing techniques according to it. In this approach we split the measurement process into four highly independent stages (illumination and observation geometry, temporal treatment, secondary-correlogram generation and fringe-pattern analysis) and establish a common notation to formulate the corresponding techniques. Such a strategy allows the free combination of the techniques proposed for each stage as building blocks to obtain every particular variant of the whole TVH measurement process, whether it has already been reported or not, and also the incorporation of new techniques while retaining compatibility with the existing variants of the previous and following stages.

Numerical modeling and measurement by pulsed television holography of ultrasonic displacement maps in plates with through-thickness defects

“…4͒. As is common in TV holography techniques, 24 we employ a configuration of an image hologram, sensitive to the out-of-plane component of the displacement of the surface points, with the image sensor of a video camera as a recording medium. There is no optical reconstruction of the recorded holograms, but instead their intensity distribution is electronically processed to render the optical phase-difference map, which depends on the displacements of the specimen surface.…”

Vibration Measurement by Speckle Interferometry between High Spatial and High Temporal Resolution

“…This is an important step in experimental modal analysis. Many other methods and two excellent reviews of the state-of-the-art were published by (Doval, 2000;Jacquot, 2008).…”

Principles and techniques of digital holographic microscopy

“…Digital Gabor holography, without separate reference beams, is useful for particle imaging applications by providing 4-D space-time records of particle fields [25]. Digital holography naturally evolved from the effort to utilize electronic imaging in interferometry, such as in electronic speckle pattern interferometry (ESPI) [26]. Metrology of deformations and vibrations is a major application area of digital holography [27].…”