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DHM

Digital Holographic Microscopy Technology

The fastest way for polished surfaces

Very insensitive to vibrations, this technology allows extremely fast measurements on polished reflective surfaces.

Technical specifications for DHM

 

DHM

Digital Holographic Microscopy (DHM) is the generation of computer images of a sample using holographic techniques.

A hologram results from the interference between the object wave reflected from a sample and magnified by a microscope objective, and a reference wave.

Using a laser source, the small angle between the waves exhibits fringes that carry the phase and amplitude information in a single image - the hologram which is captured on a digital camera in a few microseconds.

The captured image is transmitted to a computer where numerical procedures are applied to reconstruct a 3D image of the sample. This process is called "image reconstruction".
The innovation of the DHM™ patented technology is the intervention of digital processing at a level that had not been reached so far in microscopy.

                         DHM s1 DHM s2 DHM s3

OPTICAL PROBE

DHMS1

DHMS2

DHMS3

Resolution in Z

0.1 nm

0.1 nm

0.1 nm

Resolution lateral (X/Y)

0.5 µm

0.6 µm

0.6 µm

Vertical range 1)

3 µm

7 µm

7 µm

Measuring area range X/Y

~250 µm x ~250 µm

~330 µm x ~330 µm

~330 µm x ~330 µm

Optical zoom

10x

7x

7x

Wavelenght Lambda 1

~850 nm

~760 nm

~760 nm

Wavelenght Lambda 2

~665 nm

~665 nm

~665 nm

 Working distance  ~6 mm  ~6 mm ~6 mm 
 Reflectivity of the sample  < 1% to 100 % < 1% to 100 %   < 1% to 100 %

1) values can vary, depending on the texture of the parts.