Cubixel

Architecture of FSH: FSH technologies separate lights having different paths and then use a modulator for the light of one path to modulate it into light with a specific frequency. The two lights modulated into different frequencies pass the beam enlarger to expand and then take on the form of a plane wave and a spherical wave. The plane wave and spherical wave modulated into different frequencies are combined to create light in the form of a zone plate, scanning the object using the scanning mirror unit. The light reflected from the object is collected using a lens, with a single pixel detector used to convert it into the form of an electric signal.

Advantages of FSH

It is an incoherent hologram optical system that can acquire hologram information of the target without speckle noise.
Using laser lighting with directivity enables filming holes and gaps located under the target.
Using laser lighting with directivity without speckle noise enables filming holes and gaps located under the target.
It is possible to acquire high-contrast ratio images with mirror reflection features and use the single pixel detection and heterodyne detection method, using scanning that applies lights with specific patterns; thus enabling acquiring information on polished surfaces like glass and metal.
Fast 3D inspection is possible as 2D image and 3D information can be acquired by filming only once.

Speckle noise problem of
coherent optical system

Coherent imaging system that includes digital holography
and interferometry suffers from inherent coherent noise, known as Speckle

FSH as a Speckle Free Holography

FSH overcomes the inherent drawbacks
of conventional coherent imaging system

Speckle noise of a coherent imaging system

Comparative Analysis of FSH (Flying-over Scanning Holography)
and Digital Holography Principle

Flying-over Scanning Holography(FSH)

The object’s image and location information are saved using the method of scanning an object by forming the interference patterns of plane wave and spherical waves in advance.
It does not require image sensors, and images can be acquired using the single pixel detection method.

Digital Holography: Existing Types of Holography

The object’s image and location information are recorded through the interference of light reflected from the object (object light) and the baseline light (reference light).
Image sensors are essential parts; the image results acquired according to the features of image sensors (CCD, CMOS) are subordinate, and numerous pixels are used to acquire images.