Sight laser detection modeling

Lecocq, Christophe; Deshors, G.; Lado-Bordowsky, Olga; Meyzonnette, Jean-Louis

doi:10.1117/12.486055

Cited by 34 publications

(12 citation statements)

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“…However, none of these studies have studied the time distribution of partially coherent optical transmission through a multi aperture complex optical system. In order to meet the needs of some practical applications, laser oscillating mode, space toe or shaping, and different shapes of the apertures should be used, and multiple apertures are usually configured in large and complex optical systems [16][17][18]. In this paper, taking GSM beam as a model of coherent light beam, the coherent light transmission through the large complex optical system is simulated, and based on the complex Gauss decomposition of ABCD optical transmission matrix method and the matrix of the optical aperture, the recursive formula of the time series of the intensity distribution of the coherent GSM beams interference fringe field transmission through a multi aperture complex optical system is derived.…”

Section: Introductionmentioning

confidence: 99%

Time Distribution of Reflected Light Signals from Partially Coherent Light Passing Through Complex Optical Systems with Multiple Apertures

Shan¹

2019

JEEE

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Laser active detection technology scans and detects large target equipped with optoelectronic equipment by transmitting laser beam, converts the received reflected light signal into electrical signal, and obtains target information through various signal processing methods to achieve the goal of target detection. The laser beam output from the high power laser usually has multi-mode structure and partial coherence, and the optical reconnaissance equipment with complex optical structure is an equivalent system with multiple hard edge apertures. In the simulation of the coherent beams transmission through the multi aperture complex optical system, large matrix calculations are required in the spatial optical field computation, which consumes a lot of computation time. Furthermore, the size of the optical receiving lens is far less than the spot size after a long distance transmission, which results in the loss of optical information. To solve the problems, in this article, taking the Gauss Schell model (GSM) beam as a partially coherent light model, based on the Complex Gauss decomposition method for the hard edge diaphragm and ABCD optical transmission matrix, the recursive formula of the time series of the intensity distribution of the coherent GSM beams interference fringe field transmission through a multi aperture complex optical system is derived, and the influences of the spatial coherence of the GSM beam. The effects of the spatial coherence of GSM beams, the initial distance between coherent beams and the equivalent aperture size of complex optical systems on the time distribution of transmitted light intensity are analyzed. According to the results, the influence of the spatial coherence of the GSM beam on the spatial coherence of the beam itself is more obviously than that on the formation of two coherent GSM beam interference field. The interference fringe field spatial distribution and the aperture size are the main factors affecting the transmission of light time distribution. The conclusions obtained in this paper have important reference value for the application of partially coherent optical transmission through complex optical systems, and also provide a new idea for the target echo signal processing method of laser active detection.

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Section: Introductionmentioning

confidence: 99%

Time Distribution of Reflected Light Signals from Partially Coherent Light Passing Through Complex Optical Systems with Multiple Apertures

Shan¹

2019

JEEE

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“…The subject of retroreflection is under investigation by many researchers. For example, the retroreflection principle can be used for the detection of passive optical systems, sniper rifle sights, 1 and electronic distance measurements. 2 It is expected that future closed-loop directed infrared countermeasure ͑DIRCM͒ systems will use the retroreflection signal from missile seekers for fine tracking.…”

Section: Introductionmentioning

confidence: 99%

Retroreflection reduction by masking apertures

Mieremet

2010

Opt. Eng

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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 signals and image quality have been measured for different alignments of different masks. The results of these experiments in combination with the presented theory can be used to design masks that can reduce or even completely eliminate the strength of retroreflected signals, while simultaneously maintaining good image quality. © 2010 Society of Photo-Optical Instrumentation Engineers.

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“…When these optoelectronic devices are illuminated by a laser, the echo wave is higher than the diffuse targets by 2-4 orders of magnitude, on average [1,2]. Detecting and recognizing cat-eye effect targets is an important technique in military reconnaissance [3], anticandid cameras [4], free-space communication [5][6][7], optoelectronic device identification and tracking [8,9], laser range finding [10], etc. In recent years, some methods have been developed to recognize cat-eye effect targets.…”

Section: Introductionmentioning

confidence: 99%

Compressive sensing method for recognizing cat-eye effect targets

Dang

et al. 2013

Appl. Opt.

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This paper proposes a cat-eye effect target recognition method with compressive sensing (CS) and presents a recognition method (sample processing before reconstruction based on compressed sensing, or SPCS) for image processing. In this method, the linear projections of original image sequences are applied to remove dynamic background distractions and extract cat-eye effect targets. Furthermore, the corresponding imaging mechanism for acquiring active and passive image sequences is put forward. This method uses fewer images to recognize cat-eye effect targets, reduces data storage, and translates the traditional target identification, based on original image processing, into measurement vectors processing. The experimental results show that the SPCS method is feasible and superior to the shape-frequency dual criteria method.

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Sight laser detection modeling

Cited by 34 publications

References 0 publications

Time Distribution of Reflected Light Signals from Partially Coherent Light Passing Through Complex Optical Systems with Multiple Apertures

Time Distribution of Reflected Light Signals from Partially Coherent Light Passing Through Complex Optical Systems with Multiple Apertures

Retroreflection reduction by masking apertures

Compressive sensing method for recognizing cat-eye effect targets

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