InlineHolographie

InlineHolographie, also known as in-line holography or inline digital holography, is an optical technique used for recording and reconstructing three-dimensional information about an object. In this method, the object is placed directly in the path of the illuminating beam, and the interference pattern between the object beam and a reference beam is recorded on a digital sensor, such as a CCD or CMOS camera. The reference beam is typically a plane wave or a spherical wave that travels along the same optical axis as the object beam.

The recorded interference pattern, known as a hologram, contains both amplitude and phase information of the light scattered by the object. Digital reconstruction of the holographic image is then performed computationally. By applying a numerical algorithm, such as the Fresnel transform or the angular spectrum method, to the recorded hologram, the original wavefront can be propagated back to the object plane, thereby creating a digital reconstruction of the object's three-dimensional structure. This reconstruction can be viewed from different perspectives, allowing for depth perception and parallax.

Inline holography offers several advantages, including a relatively simple optical setup and the ability to record high-resolution images with good depth of field. It is particularly well-suited for applications involving microscopic objects, such as the study of biological samples, particles, and fluid dynamics. The digital nature of the recording and reconstruction process also facilitates automated analysis and integration with other digital imaging techniques. However, it can be sensitive to vibrations and require careful alignment of the optical components.