Special Issue "Digital Holography in Optics: Techniques and Applications"
Deadline for manuscript submissions: 15 January 2024 | Viewed by 395
Many challenging measurement tasks in production simultaneously have high requirements for accuracy, measurement field size, lateral sampling, and measurement time. Standard machine vision methods are usually based on powerful non-contact measurement and optical inspection approaches. However, the potential applications of these approaches, especially at the micro-/nano-scale, are restricted by the finite depth of field and fixed working distance of imaging devices. Digital holography is an emerging imaging technique incorporating numerical wavefront reconstruction, a technique which uses a digital sensor array (typically a CCD/CMOS image sensor or a similar device) for the acquisition and processing of holograms and records the optical wave diffracted by the object onto the image sensor. The object is reconstructed numerically by propagating the recorded wavefront backward. The object distance becomes a computation parameter that can be chosen arbitrarily and adjusted to match the object position. No refractive lens is used and the usual depth-of-field and working distance limitations are replaced by less restrictive boundaries tied to the laser source coherence length and to the pixel pitch and chip size of the image sensor. Digital holography extends the field of application of machine vision and optical metrology by allowing for the attainment of a large range of depths of focus, working distances, and spatial resolutions that are inaccessible to refractive imaging systems. In this way, it has become a powerful method for optical sensing and metrology applications as it can measure a relatively large field of view with interferometric precision and short acquisition times and assess both reflective and transmissive surfaces simultaneously. Furthermore, the rapid advancement of optical sensing, display, and computing technologies holds great promise for the future development and application of digital holography in optics.
Dr. Chau-Jern Cheng
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- digital holography
- optical metrology
- deep leaning
- biological cell imaging
- optical inspection
- unconventional imaging
- resolution enhancement