Digital holographic cameras and data processing for remote monitoring and measurements of mechanical parts

Abstract

Fast growing technology and requirements for testing of different types of materials and devices require new methods and systems for investigation of their parameters. Among the quantities of high interest are shape, deformation, roughness, local materials constants, displacement, and strain fields of elements under load. In the paper, we present novel solutions for digital holographic cameras, which allow for remote monitoring and measurement of the above mentioned quantities at small mechanical objects or at restricted areas of interest at big structures. The systems have compact design, “black box” measurement approach, and allows for fast and accurate measurements performed directly at the element and often in outdoor environment. The principles of digital and optoelectronic reconstruction and phase manipulation are described together with the exemplary measurement results obtained by means of the cameras presented.

Emerging scientific and industrial applications of digital holography: an overview

“…Efforts have been made for longtime to develop compact and portable digital holographic systems [64][65][66][67][68][69][70][71][72]. Georges and Lemaire [65], reported a transportable holographic interferometer developed on the breadboard of size 80 cm × 30 cm × 20 cm and it weighed 15 kg.…”

“…A standard 6X TV zoom lens utilized to form an image of the object which was relayed to a TV camera connected to an interferometer module via a mirror, relay lens, and beam splitter. In further research, Michałkiewicz et al proposed digital holographic cameras [68] in two different configurations i.e., DH_SHAPE and DH_UVW for shape and three-dimensional displacement measurements of small region of interest (15 mm × 10 mm) on mechanical parts. Both configurations utilized a pigtailed laser source, placed outside the measurement head.…”

Digital Holographic Interferometry as a Method for Analyzing Laser-Induced Microdilation Process

“…Herramientas como las simulaciones por elementos finitos han permitido llevar el desarrollo tecnológico a niveles que podrían haber sido considerados irracionales hace algunas décadas. Sin embargo los procesos de micro dilatación han sido poco estudiados y resultan de fundamental importancia en aplicaciones como la microelectrónica [1][2][3][4]. Hasta hace algunos años el comportamiento térmico -dinámico * fabiovincitorio@frp.utn.edu.ar de la mayor parte de los componentes resultaba indiferente ya que las propias dimensiones de los dispositivos electrónicos y su montaje, asociado a los niveles térmicos, no hacían que fuese fundamental avanzar más allá del análisis de conducción y disipación térmica.…”

Interferometric trigger method with dual piezoelectric transducers for digital holographic interferometry

“…3,4 Many researchers have studied this method. Several types of compact instruments have been developed, 3,[5][6][7][8][9] and several types of phase-shifting methods have been proposed. [10][11][12] The authors have also developed compact instruments for strain distribution measurements.…”