Digital holography

Digital holographic 3D measurement technology enables the fast (sub-second), and at the same time, highly precise (micrometer range) measurement of 3D geometries of typically matchbox-sized technical components. The basic principle of holography dates back to an invention (1948) by Dennis Gabor, for which he was awarded the Nobel Prize in Physics in the year 1971.

Unlike photography, in which the spatial distribution of light intensity is stored, holography also utilizes recording of the phase information. This necessitates a coherent light source – typically a laser. If the surface of a test specimen is then illuminated with laser light, the shape of the test specimen is stored in the phase distribution of the backscattered light wave. Interferometric recording and subsequent digital reconstruction make this information accessible and it is used to measure surfaces three-dimensionally.

Measurement with Multiple Wavelengths on Technical Surfaces

Using multiple narrow-band lasers, various synthetic wavelengths are generated. These differing wavelengths facilitate a broad measuring range from the (sub) micrometer range to the millimeter range, depending on surface roughness. Resolution and reproducibility of the measurements depend on the distance between the individual wavelengths and on surface properties and can be flexibly adapted to the relevant application by the skillful choice of light sources.

Unlike classic interferometry or holography with only one laser wavelength, multi-wavelength holography allows the measurement of optically rough surfaces. The speckle noise produced on rough surfaces which normally renders quantitative phase evaluations for determining topography impossible is eliminated by numerical reconstruction at different wavelengths. This results in a phase map at the beat frequency of the individual wavelengths which contains the information regarding the topography of the illuminated object and which can be evaluated quantitatively.

Accuracy and Speed with Regard to Extremely Demanding Inline Inspection Tasks

The CPU-intensive digital-holographic reconstruction of the complex-valued wavefields in which the test specimen topography is stored is performed on state-of-the-art graphics adapters and this process has been accelerated by several orders of magnitude in recent years. The »HoloTop« 3D sensor developed by Fraunhofer IPM evaluates over 100 million measuring points per second and is thus unique as regards accuracy and speed.

Fraunhofer IPM has a key patent (DE102008020584B3) for the self-calibration of the synthetic wavelengths, the length of which represents the measurement standard of the procedure.

Further information

 

Light: Advanced Manufacturing 2, Article number: 15 (2021) / 5.7.2021

Overview: Digital holography in production

In an LAM article, our experts provide an overview of the possibilites for industrial application of digital holography with multiple wavelengths – from its first application in the production of sealing surfaces for the automotive industry in 2015 to current use in high-precision processor manufacturing.

 

Press Release / 24.3.2021

Industrial application on the horizon: using digital holography to survey moving objects

Dr. Annelie Schiller was awarded the Hugo Geiger Prize for her doctoral work on the topic of using digital holography to survey moving objects.

 

Applications

Geometry measurement

High-precision 3D inline measurement of components

Publications »Digital Holographie«

Jahr
Year
Titel/Autor:in
Title/Author
Publikationstyp
Publication Type
2024 Detecting vibrations in digital holographic multiwavelength measurements using deep learning
Störk, Tobias; Seyler, Tobias; Fratz, Markus; Bertz, Alexander; Hensel, Stefan; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2023 Digital holography in a machine tool: measuring large-scale objects with micron accuracy
Seyler, Tobias; Fratz, Markus; Schiller, Annelie; Bertz, Alexander; Carl, Daniel; Schmitt-Manderbach, Tobias; Langer, Markus
Konferenzbeitrag
Conference Paper
2023 Simulating Holograms from 3D CAD Models via Inverse Hologram Reconstruction for Multiwavelength Holography
Aslan, Marc Johannes; Seyler, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel; Beck, Maxim; Riedmüller, Kim Rouven; Liewald, Mathias
Konferenzbeitrag
Conference Paper
2023 Extended Unambiguous Measurement Range in Multi-Wavelength Digital Holography Using Virtual CAD Rendered Height Maps
Laskin, Gennadii; Seyler, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2023 Dynamisch-holographisches Messverfahren zur Erfassung metallischer Freiformflächen (HoloMotion). Schlussbericht
Fratz, Markus; Schiller, Annelie; Bertz, Alexander
Bericht
Report
2023 Investigation of Permuted Phase Steps on Multiwavelength Digital Holographic Measurements
Störk, Tobias; Seyler, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2023 Multiwavelength Holography: Absolute Height Measurements Ready for Application in Gear Metrology
Schiller, Annelie; Fratz, Markus; Seyler, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2022 Multiwavelength digital holography with meter scale synthetic wavelengths at micrometer precision
Seyler, Tobias; Kießling, Jens; Bertz, Alexander; Schiller, Annelie; Stevanovic, Jonas; Fratz, Markus; Carl, Daniel
Konferenzbeitrag
Conference Paper
2022 Combined electronic speckle pattern interferometry and digital holography for analysis of deformations in magnetic shape memory actuators
Laskin, Gennadii; Heider, Jonas; Schnetzler, René; Fratz, Markus; Schiller, Annelie; Bertz, Alexander; Laufenberg, Markus; Carl, Daniel
Konferenzbeitrag
Conference Paper
2022 HOLO-KI: KI-basierte Qualitätskontrolle von Hochpräzisions-Drehteilen. Abschlussbericht
Seyler, Tobias
Bericht
Report
2022 Extended depth of field with absolute position detection in multi-wavelength digital holography
Fratz, Markus; Seyler, Tobias; Schiller, Annelie; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2022 Adiabatic frequency conversion in microresonators for multi-wavelength holography
Breunig, Ingo; Minet, Yannick; Seyler, Tobias; Bertz, Alexander; Holl, Peter; Basler, Michael; Zappe, Hans; Buse, Karsten
Konferenzbeitrag
Conference Paper
2021 Multi-wavelength digital holography on a collaborative robot
Seyler, Tobias; Beckmann, Tobias; Stevanovic, Jonas; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2021 Digital holography in production. An overview
Fratz, Markus; Seyler, Tobias; Bertz, Alexander; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2021 Flächige Zahnflankenprüfung mittels digitaler Holographie
Schiller, Annelie; Fratz, Markus; Seyler, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2021 Topographiemessung mittels digitaler Holographie auch an bewegten Objekten
Schiller, Annelie; Bertz, Alexander
Zeitschriftenaufsatz
Journal Article
2021 Submikrometergenaue 3D-Oberflächenmessung in der Produktion
Fratz, Markus; Seyler, Tobias; Schiller, Annelie; Bertz, Alexander
Aufsatz in Buch
Book Article
2021 Hohe Messraten, hochgenaue Messergebnisse
Bertz, Alexander
Zeitschriftenaufsatz
Journal Article
2021 Digitalholographische 3D-Messtechnik
Carl, Daniel
Aufsatz in Buch
Book Article
2021 Microscopic height measurements on moving objects with digital holography
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2021 Digital holography as a tool for high-speed high-precision 3D-measurements for industrial applications
Fratz, Markus; Beckmann, Tobias; Seyler, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2021 Digital holographic measurement system for use on multi-axis systems
Stevanovic, Jonas; Seyler, Tobias; Aslan, Johannes; Beckmann, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2021 High-speed electronic speckle pattern interferometry for analysis of thermo-mechanical behavior of electronic components
Laskin, Gennadii; Huai, Haosu; Fratz, Markus; Seyler, Tobias; Beckmann, Tobias; Schiffmacher, Alexander; Bertz, Alexander; Wilde, Jürgen; Carl, Daniel
Konferenzbeitrag
Conference Paper
2020 Messung der Topographie bewegter Objekte mittels digitaler Holographie
Schiller, Annelie
Dissertation
Doctoral Thesis
2020 Messung der Topographie bewegter Objekte mittels digitaler Holographie
Schiller, Annelie
Dissertation
Doctoral Thesis
2020 HoloPort - design and integration of a digital holographic 3-D sensor in machine tools
Seyler, Tobias; Engler, Johannes; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2020 HoloPort - Submikrometergenau 3D-Messen in der Werkzeugmaschine
Seyler, Tobias; Engler, Johannes; Fuchs, Markus; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel; Grün, Viktor; Börret, Rainer; Ströer, Felix; Seewig, Jörg
Zeitschriftenaufsatz
Journal Article
2020 Holographie-Mikroskop mit Raspberry Pi
Beckmann, Tobias
Zeitschriftenaufsatz
Journal Article
2020 Digitale Holographie in der Werkzeugmaschine
Seyler, Tobias
Dissertation
Doctoral Thesis
2020 Robust multiwavelength digital holography using cascaded data evaluation
Seyler, Tobias; Bienkowski, Lasse; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Vortrag
Presentation
2019 Multiwavelength holography: Height measurements despite axial motion of several wavelengths during exposure
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Zeitschriftenaufsatz
Journal Article
2019 Optical gear measurement: Holographic system for 100 % inspection
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Seyler, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2019 3D-Inline-Messtechnik
Seyler, Tobias; Fratz, Markus; Beckmann, Tobias; Schiller, Annelie; Engler, Johannes; Bertz, Alexander; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2019 Inline application of digital holography [Invited]
Fratz, Markus; Beckmann, Tobias; Anders, Joachim; Bertz, Alexander; Bayer, Markus; Gießler, Thomas; Nemeth, Christian; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2019 HoloPort - 3D-Inline-Messtechnik für die Werkzeugmaschine
Seyler, Tobias
Zeitschriftenaufsatz
Journal Article
2019 Multiwavelength digital holography in the presence of vibrations: Laterally resolved multistep phase-shift extraction
Seyler, Tobias; Bienkowski, Lasse; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2019 Multiwavelength digital holography in the presence of vibrations: Laterally resolved multi-step phase-shift extraction
Seyler, Tobias; Bienkowski, Lasse; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2019 Motion compensation for interferometric off-center measurements of rotating objects with varying radii
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Zeitschriftenaufsatz
Journal Article
2019 Digital Holographic Microscopy for 200 € Using Open-Source Hard- and Software
Beckmann, Tobias; Fratz, Markus; Schiller, Annelie; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2019 Multiwavelength Holography: Height Measurements Despite Axial Motion of Several Wavelengths During Exposure
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Konferenzbeitrag
Conference Paper
2019 Industrial applications of digital holography
Fratz, Markus; Beckmann, Tobias; Anders, Joachim; Bertz, Alexander; Bayer, Markus; Gießler, Thomas; Carl, Daniel
Konferenzbeitrag
Conference Paper
2019 HoloPort - 3D-Sensor for machine tools
Seyler, Tobias; Engler, Johannes
Konferenzbeitrag
Conference Paper
2018 Multiwavelength digital holography: Height measurements on linearly moving and rotating objects
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Konferenzbeitrag
Conference Paper
2018 Flächige 3D-Messung in der Werkzeugmaschine
Seyler, Tobias; Fratz, Markus; Grün, Viktor; Börret, Rainer
Zeitschriftenaufsatz
Journal Article
2018 Extending the depth of field beyond geometrical imaging limitations using phase noise as a focus measure in multiwavelength digital holography
Seyler, Tobias; Fratz, Markus; Beckmann, Tobias; Schiller, Annelie; Bertz, Alexander; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
2018 Extensive microstructural quality control inside a machine tool using multiwavelength digital holography
Seyler, Tobias; Fratz, Markus; Beckmann, Tobias; Bertz, Alexander; Carl, Daniel; Grün, Viktor; Börret, Rainer; Ströer, Felix; Seewig, Jörg
Konferenzbeitrag
Conference Paper
2017 Digital holography on moving objects
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Belzer, Dominik; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Zeitschriftenaufsatz
Journal Article
2017 Miniaturized multiwavelength digital holography sensor for extensive in-machine tool measurement
Seyler, Tobias; Fratz, Markus; Beckmann, Tobias; Bertz, Alexander; Carl, Daniel
Konferenzbeitrag
Conference Paper
2017 Digital holography: Evolution from a research topic to a versatile tool for the inline 100% 3D quality control in industry
Fratz, Markus; Beckmann, Tobias; Schiller, Annelie; Seyler, Tobias; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Konferenzbeitrag
Conference Paper
2017 Digital holography on moving objects. Multiwavelength height measurements on inclined surfaces
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Belzer, Dominik; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Konferenzbeitrag
Conference Paper
2017 Digital-holographische 3D-Messtechnik
Carl, Daniel
Aufsatz in Buch
Book Article
2017 3D-Oberflächenmessung mit digitaler Mehrwellenlängen-Holographie
Fratz, Markus; Beckmann, Tobias
Aufsatz in Buch
Book Article
2016 Multiwavelength digital holography with spatial phase shifting on moving objects
Schiller, Annelie; Beckmann, Tobias; Fratz, Markus; Belzer, Dominik; Bertz, Alexander; Carl, Daniel; Buse, Karsten
Konferenzbeitrag
Conference Paper
2016 Geprüfte Oberflächen. Sub-µm Inline-3D-Oberflächenprüfung im Sekundentakt
Fratz, Markus; Beckmann, Tobias; Bertz, Alexander; Carl, Daniel
Zeitschriftenaufsatz
Journal Article
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