Frank van Putten

Frank van Putten
Fraunhofer Institute of Optronics, System Technologies and Image Exploitation IOSB | IOSB · Department of Optronics (OPT)

Bachelor of Applied Science

About

31
Publications
3,144
Reads
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330
Citations

Publications

Publications (31)
Article
Laser vibrometry based on coherent detection allows noncontact measurements of small-amplitude vibration characteristics of objects. This technique, commonly using the Doppler effect, offers high potential for short-range civil applications and for medium- or long-range applications in defense and security. Most commercially available laser Doppler...
Conference Paper
This paper presents experimental work on the use of a CO2 laser for triggering of PIR sensors. Pyro-electric InfraRed sensors are often used as motion detectors for detection of moving persons or objects that are warmer than their environment. Apart from uses in the civilian domain, also applications in improvised weapons have been encountered. In...
Article
Laser vibrometry based on coherent detection allows non-contact measurements of small-amplitude vibration characteristics of objects. This technique, commonly using the Doppler effect, offers much potential for short-range civil applications and for long-range applications in defence and security. Most commercially available laser vibrometers are f...
Article
Full-text available
A theoretical and experimental study is performed to eliminate the effect of retroreflection of a camera by using masks. Theoretically, different types of masks are studied in terms of their capability to reduce the strength of the retroreflected signal while maintaining good camera image quality. Experimentally, the strength of retroreflected sign...
Article
Coastal surveillance and naval operations in the littoral both have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and a low velocity that makes them hard to detect by radar. Typical threats include jet skis, FIAC's, and speedboats. Previous lidar measurements at the coast of the Netherlands have...
Article
Naval operations in the littoral have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and low velocity, which makes them hard to detect by radar in the presence of sea clutter. Search lidars can provide an alternative detection capability for small sea-surface targets at ranges up to 10 km (using...
Article
Naval operations in the littoral have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and low velocity, which makes them hard to detect by radar in the presence of sea clutter. Search lidars can provide an alternative detection capability for small sea-surface targets at ranges up to 10 km (using c...
Article
Full-text available
Naval operations in the littoral have to deal with threats at short range in cluttered environments with both neutral and hostile targets. There is a need for fast identification, which is possible with a laser range profiler. Additionally, in a coastal-surveillance scenario a laser range profiler can be used for identification of small sea-surface...
Article
Full-text available
Coastal surveillance and naval operations in the littoral both have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and a low velocity that makes them hard to detect by radar. Typical threats include jet skis, FIAC's, and speedboats. Lidar measurements at the coast of the Netherlands have shown a v...
Article
Naval operations in the littoral have to deal with threats at short range in cluttered environments with both neutral and hostile targets. On board naval vessels there is a need for fast identification, which is possible with a laser range profiler. Additionally, in a coast-surveillance scenario a laser range profiler can be used for identification...
Article
Naval operations in the littoral have to deal with the threat of small sea-surface targets. These targets have a low radar cross-section and low velocity, which makes them hard to detect by radar in the presence of sea clutter. Typical threats include periscopes, jet skies, FIAC's, and speedboats. Search lidars on board naval vessels can provide de...
Article
Full-text available
Laser countermeasures against infrared focal plane array cameras aim to saturate the full camera image. In this paper we will discuss the results of three different dazzling experiments performed with MWIR lasers and show that the obtained results are independent of the read-out mechanism of the camera and can be explained by an expression derived...
Article
In this project the benefits of adaptive optics for military applications are assessed. Adaptive optics can be used in electro-optical camera systems and it can be used in laser systems such as directed infrared counter measure systems. In a WEAG project JP8.11 on Precision Laser Beam Steering the benefits of adaptive optics for long range target i...
Article
Acoustic Landmine Detection (ALD) using a laser vibrometry was studied using two acoustic ground excitation methods: acoustic (loudspeaker) excitation (AE) and laser excitation (LE). AE is suitable for detecting buried landmines but is a slow technique. A faster AE method based on a CMOS camera was proposed but not studied further. LE is potentiall...
Article
Small maritime targets, e.g., periscope tubes, jet skies, swimmers and small boats, are potential threats for naval ships under many conditions, but are difficult to detect with current radar systems due to their limited radar cross section and the presence of sea clutter. On the other hand, applications of lidar systems have shown that the reflect...
Article
Countermeasures against heat seeking missiles require access to efficient laser sources, which should emit wavelengths at band I, II and IV. Efficient diode pumped solid-state lasers, combined with efficient non-linear wavelength shifters, allow the development of practical tuneable mid-IR countermeasure sources. The paper describes the requirement...
Article
Countermeasures against heat seeking missiles require access to efficient laser sources, which should emit wavelengths at band I, II and IV. Efficient diode pumped solid-state lasers, combined with efficient non-linear wavelength shifters, allow the development of practical tuneable mid-IR countermeasure sources. The paper describes the requirement...
Article
Acoustic landmine detection (ALD) is a technique for the detection of buried landmines including non-metal mines. Since it gives complementary results with GPR or metal detection, sensor fusion of these techniques with acoustic detection would give promising results. Two methods are used for the acoustic excitation of the soil: laser excitation and...
Article
Acoustic landmine detection (ALD) is a technique for the detection of buried landmines including non-metal mines. An important issue in ALD is the acoustic excitation of the soil. Laser excitation is promising for complete standoff detection using lasers for excitation and monitoring. Acoustic excitation is a more common technique that gives good r...
Article
A short-pulse 1.444-μm laser based on Nd:YAG technology has been demonstrated. The 1.444-μm is eye-safe. With the cavity-dump technique, a pulse of 50 m× and 14 ns was obtained. The beam quality was excellent with an M<sup>2</sup> of 1.6 by the use of a telescopic resonator. Silicon-window polarizers were used to suppress the 1.06-μm radiation but...
Article
The generation of 3 to 5 microns laser radiation and the required powers to jam IR-seekers were investigated in relation to a laser-jamming system. Sufficient powers were reached with two generation methods. The first method used difference frequency generation (DFG) to obtain 4.04 microns radiation using the mixing in LiNbO3 of 1.064 microns and 1...
Article
We analyzed a time series of high resolution 8 - 13.4 micrometers scanner images of a sandbox with buried (3 - 10 cm depth) and unburied, metal and plastic AP and AT mines, surrogates and other targets. With a high resolution DUDA scanner operating in 8 - 13.4 micrometers all the surface laid targets were visible during the whole diurnal cycle. The...
Article
Stokes beam quality as obtained by stimulated Raman scattering is investigated numerically using various pump-beam profiles. It is found that the quality of the Stokes beam, expressed by M<sup>2</sup>, is often roughly the same as the pump beam. For pump beams with Gaussian-Hermite modes, TEM<sub>00</sub> and TEM<sub>01</sub>, the Stokes beam has t...
Article
The conversion efficiency of a Raman cell at high pump energies has been increased with an astigmatic focus. Experimental and numerical results show that the increased conversion is due to the reduction of cascade second order Stokes. For our experimental setup, it is shown that other effects, namely Brillouin scattering, anti-Stokes generation, an...
Article
An astigmatic focus has been used to increase the conversion efficiency of a Raman cell at high pump energy. Experimental and numerical results show that the increased conversion is due to the reduction of cascade second order Stokes. It is shown that other effects, namely Brillouin scattering, anti-Stokes generation, and ground-state depletion, ar...
Article
The threshold power of stimulated Raman scattering (SRS) has been calculated for various nondiffraction-limited pump beams using a numerical model. These calculations were performed for the following pump beam profiles: Gaussian-Hermite, Gaussian-Laguerre, Gaussian-Schell-model (GSM), and several superpositions of Gaussian-Hermite modes. It is show...
Article
Experiments were performed to obtain a high efficiency for conversion of 1064 nm to eye-safe 1543 nm radiation by stimulated Raman scattering (SRS) in methane. A first order Stokes photon conversion efficiency of about 75 percent is obtained for an input energy of 280 mJ, using combination of cylindrical lenses for focusing. The highest obtainable...
Article
Full-text available
We report about experiments with a Nd:YAG laser operating at 1.064 microns which are carried out to obtain an efficient source of eye-safe 1.54 microns radiation. This conversion is obtained by Stimulated Raman Scattering in methane by applying focussing and a dichroic mirror for feedback. The varied parameters are laser power, pulse repetition rat...
Chapter
The experimentally determined pulsed damage threshold powers for bare silicon material were found to be 3.4J/cm
Chapter
The threat of Low Energy Lasers to airborne optical sensors aircraft becomes more and more a concern of flying forces. Lasers could temporarily or permanently disable Electro Optical sensors (e.g. navigation and missile sensors) and, more importantly, the eyes of aircrew. The Netherlands Ministry Of Defence initiated an investigation for the benefi...
Chapter
In this second volume of the report on the study into potential threat of Low Energy Lasers to airborne sensors of the Royal Netherlands Air Force, the basics of the technical part of the engagements are investigated and recorded. The existing inventory of military laser systems in Volume 1 has been updated for new systems and new data. New data fo...

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