Using a CO2 laser for PIR-detector spoofing

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....

Retroreflection reduction by masking apertures

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...

Results from the search-lidar demonstrator project for detection of small Sea-Surface targets

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...

Laser applications in the littoral: Search lidar and ship identification

Search-Lidar Demonstrator for Detection of Small Sea-Surface Targets

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...

Experimental Validation of Ship Identification with a Laser Range Profiler

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...

Identification of Littoral Targets with a Laser Range Profiler

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...

Laser Dazzling of Focal Plane Array Cameras

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...

Development of a Mid-Infrared Laser for Study of Infrared Countermeasures Techniques

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...

Laser-induced acoustic landmine detection with experimental results on buried landmines

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...

Sound wave and laser excitation for acousto-optical landmine detection

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...

Short-Pulse, Eye-Safe Nd:YAG Laser Using Cavity-Dumping

A short-pulse 1.444-µm laser based on Nd:YAG

Detection of surface laid and buried mines with IR and CCD cameras, an evaluation based on measurements

We analyzed a time series of high resolution 8 - 13.4 μm 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 μm all the surface laid targets were visible during the whole diurnal cycle. The buried targets...

Experimental and Numerical Study of Stimulated Raman Scattering in an Astigmatic Focus

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 e5ects, namely Brillouin scattering, anti-Stokes generation, and ground-state depletion...