Dr. Johan Leijtens Profile

Dr. Johan Leijtens

Systems Engineer

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Publications (17)

Proceedings Article | 11 June 2021 Open Access

Digital Sunsensors, where there is no ease, in adding ten degrees

Johan Leijtens, Dick Broekmans, Frank Stelwagen

Proceedings Volume 11852, 118523F (2021) https://doi.org/10.1117/12.2599546

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Proceedings Article | 26 August 2019 Open Access

The APS+ and intelligent active pixel sensor centered on low power

Ning Xie, Albert Theuwissen, Bernhard Büttgen, Henk Hakkesteegt, Henk Jansen, Johan Leijtens

Proceedings Volume 10565, 105655B (2019) https://doi.org/10.1117/12.2309272

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Proceedings Article | 12 July 2019 Open Access

Advent of the IBIS as the digital sunsensor for the future

J. Leijtens, D. Broekmans, S. Schmidt, G. van der Horn, R. Visee

Proceedings Volume 11180, 111807U (2019) https://doi.org/10.1117/12.2536201

KEYWORDS: Sensors, Digital electronics, Satellites, Signal processing, Sun, Electronics, Prototyping, Interfaces, Reliability, Photodiodes

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For many years there have been attempts to eliminate the earth albedo sensitivity for Sunsensors. This is best done through development of a true digital Sunsensor.

The best known digital Sunsensor was designed (and patented) by Adcole back in the 1970's only to be followed by the Leonardo smart digital Sunsensor and a small digital Sunsensor developed by Sinclair interplanetary some 30 years later. The first two sensors are relatively large and expensive, whereas the later is small and affordable but lacks the required radiation tolerance and quality level required for longer duration ESA missions. Although TNO attempted to develop a small but highly reliable Sunsensor between 2004 and 2010, this development did not lead further than the prototype called mini-DSS.

From this TNO research and developments it became apparent that the detector technology and detection principle used are key to delivering the desired properties: high reliability, low cost, small form factor and low power consumption.

While Leonardo stopped the development of a small digital Sunsensor in 2017, Lens R&D is now developing such a device in frame of an ESA Artes 5.1 contract signed in April 2018.

Based on insights developed during the TNO mini/micro-DSS program and a new operating principle, the Intensity Based Images Sensing (IBIS) principle is expected to lead to a producible sensor that is low power, highly reliable and cost effective.

The dedicated imager (dubbed IPS) required for the demonstrator to be built within the framework will be designed by SystematIC Design and is expected to show a very low power consumption and low operation voltage. These properties are important in order to allow for further design optimizations related to potential autonomous powering or power over data applications.

The presentation will focus on the status of the Artes program design considerations for the IBIS sensor and the optical design of the sensor, which is core to providing a highly reliable but cost-effective sensor.

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Proceedings Article | 21 November 2017 Open Access

Micro optical sensor systems for sunsensing applications

Johan Leijtens, Kees de Boom

Proceedings Volume 10567, 105673R (2017) https://doi.org/10.1117/12.2308108

KEYWORDS: Optical sensors, Astronomical imaging

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Proceedings Article | 21 November 2017 Open Access

“Sturdy as a house with four windows,” the star tracker of the future

Tom Duivenvoorde, Johan Leijtens, Erik van der Heide

Proceedings Volume 10566, 105660R (2017) https://doi.org/10.1117/12.2308265

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Proceedings Article | 21 November 2017 Open Access

Microbolometer spectrometer opens hoist of new applications

J. Leijtens, C. Smorenburg, I. Escudero, E. Boslooper, H. Visser, W. v. Helden, F. Breussin

Proceedings Volume 10568, 105680B (2017) https://doi.org/10.1117/12.2307992

KEYWORDS: Microbolometers, Sensors, Spectroscopy, Imaging systems, Optical filters, Mirrors, Multispectral imaging, Absorption, Optics manufacturing, Germanium

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Proceedings Article | 21 November 2017 Open Access

MIBS breadboard ready for testing

Johan Leijtens, Bryan de Goeij, Erik Boslooper

Proceedings Volume 10567, 105671Z (2017) https://doi.org/10.1117/12.2308107

KEYWORDS: Astronomical imaging

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Proceedings Article | 20 November 2017 Open Access

NANOMEFOS non-contact measurement machine for aspheric and freeform optics

R. Henselmans, G. P. H. Gubbels, C. van Drunen, B. van Venrooy, J.A.P. Leijtens

Proceedings Volume 10565, 1056525 (2017) https://doi.org/10.1117/12.2309250

KEYWORDS: Metrology, Calibration, Freeform optics, Aspheric lenses, Surface finishing, Astronomical imaging, Polishing, Interferometers, Mirrors, Raster graphics

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Proceedings Article | 20 November 2017 Open Access

Now is the time for the sunsensor of the future

Johan Leijtens, K. de Boom, M. Durkut, H. Hakkesteegt, A. Theuwissen, N. Xie

Proceedings Volume 10565, 105652A (2017) https://doi.org/10.1117/12.2309225

KEYWORDS: Sensors, Astronomical imaging, Interfaces, Satellites, Sapphire, Aluminum, Calibration, Manufacturing, Power supplies, Connectors

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Proceedings Article | 20 November 2017 Open Access

A new star (sensor) is born

Johan Leijtens, Willem Vliegenthart, Dimitris Lampridis, Giuseppe Vacanti, Bert Monna, Elbert Bechthum, Koen Hagenaars, Erik van der Heide, Michiel Kruijff, Eddie van Breukelen, Anita LeMair

Proceedings Volume 10565, 1056529 (2017) https://doi.org/10.1117/12.2309228

KEYWORDS: Sensors, Stars, Cameras, Electronics, Manufacturing, Astronomical imaging, Optical design, Space operations, Point spread functions, Star sensors

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Proceedings Article | 25 September 2017 Open Access

How low can you go: sunsensors for extreme sensing applications

J. Leijtens, J. Uittenhout, A. Los, S. Schmidt

Proceedings Volume 10562, 105623G (2017) https://doi.org/10.1117/12.2296035

KEYWORDS: Sensors, Temperature metrology, Sapphire, Resistance, Astronomical imaging, Sun, Diodes, Signal to noise ratio, Electrons, Liquids

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Proceedings Article | 26 October 2007 Paper

MIBS: past, present and future

J. Leijtens, C. Hoegaerts, J. Barros, J. de Vries

Proceedings Volume 6744, 674418 (2007) https://doi.org/10.1117/12.735513

KEYWORDS: Sensors, Temperature metrology, Cameras, Black bodies, Mirrors, Spectroscopy, Microbolometers, Prisms, Assembly tolerances, Satellites

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Proceedings Article | 17 October 2007 Paper

Active pixel sensors: the sensor of choice for future space applications?

Johan Leijtens, Albert Theuwissen, Padmakumar Rao, Xinyang Wang, Ning Xie

Proceedings Volume 6744, 67440V (2007) https://doi.org/10.1117/12.735512

KEYWORDS: Sensors, Imaging systems, CCD image sensors, Charge-coupled devices, Sun, Image processing, Active sensors, Tolerancing, Oxides, Signal processing

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Proceedings Article | 3 October 2006 Paper

Smart FPA's: are they worth the effort?

Johan Leijtens, Albert Theuwissen, Pierre Magnan

Proceedings Volume 6361, 636115 (2006) https://doi.org/10.1117/12.684594

KEYWORDS: Sensors, Imaging systems, Charge-coupled devices, Sun, Quantum efficiency, Signal processing, CMOS sensors, CMOS technology, CCD image sensors, Image processing

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Proceedings Article | 7 September 2006 Paper

Optical instruments heading in a new direction

Johan Leijtens, Wouter Jan Ubbels

Proceedings Volume 6296, 629616 (2006) https://doi.org/10.1117/12.677512

KEYWORDS: Satellites, Sensors, Space operations, Signal to noise ratio, Electronics, Aerospace engineering, Telescopes, Solar cells, Optical components, Space telescopes

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Proceedings Article | 7 September 2006 Paper

MIBS breadboard ready for testing

Johan Leijtens, Bryan de Goeij, Erik Boslooper

Proceedings Volume 6296, 62961C (2006) https://doi.org/10.1117/12.674755

KEYWORDS: Sensors, Microbolometers, Multispectral imaging, Spectroscopy, Bolometers, Infrared sensors, Temperature metrology, Thermography, Infrared radiation, Absorption

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Proceedings Article | 29 August 2006 Paper

Microsystem technology toughens up sun sensors for extreme environments

Johan Leijtens, Kees de Boom

Proceedings Volume 6308, 63080D (2006) https://doi.org/10.1117/12.674792

KEYWORDS: Sensors, Satellites, Environmental sensing, Glasses, Tolerancing, Microsystems, Manufacturing, Reliability, Sun, Antennas

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Showing 5 of 17 publications

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