Cat-eye Effect Research Articles

基于嵌入式平台的猫眼效应目标实时探测系统研究

基于嵌入式平台的猫眼效应目标实时探测系统研究

Theoretical Analysis on Retro-Reflected Wave Power Based on “Cat-Eye” Effect in Defocusing Condition

Retro-reflected wave power of cat-eye target is an important factor for active laser detection system, which can evaluate high or low cat-eye effect of photoelectrical device. Theoretical and experimental results show that retro-reflected wave power will rapidly decline with defocusing distance increases and the decline more notable in negative defocusing condition.

Properties of cat-eye modulating retro-reflector and its application with piezoelectric transducer

Piezoelectric cat-eye modulating retro-reflector (MRR) is the core component of an acousto-optic retro-identification system. The influence of the optical parameters (link distance l, lens focal length f and the detector diameter r) to the cat-eye effect was analyzed theoretically and experimentally. A piezoelectric cat-eye retro-identification (PCERI) system was built, and an information transmission ratio of 2kHz was achieved which can satisfy an access control system.

An interferometry measure method on vibration spectrum of optical target based on cat-eye effect

In this paper, a simple method for measuring the vibration spectrum of optical target is proposed. It is performed by irradiating a laser beam on the optical window of the target and then making the cat-eye reflected light interfere with the reference incident light. The interference process and intension distribution are studied by using formula derivation and numerical computation. The experimental results are in agreement with the theoretic results. By using this method, we can get an interference intension time curve with higher contrast than the signal acquired by direct detection technique, so the optical target hidden in complicated background can be found much more easily and the vibration spectrum of the carrier with optical target can be acquired simply. Also this applied method is simple, effective, convenient for using, and has a high measure accuracy of one wavelength to vibration amplitude, as has been verified by a series of examples of simulated and experiment.

Compressive sensing method for recognizing cat-eye effect targets

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.

Centroid position deviation of distorted cat-eye effect reflected beam

Based on the definition of first order moment and the approximate three-dimensional analytical formula for oblique laser beam passing through a cat-eye optical lens with center shelter and inclined detector, the analytical expression of centroid position of the cat-eye effect reflected light under far-field condition has been deduced. Variable laws of centroid position deviation at the return place are performed by numerical calculation, and analyzed physically. The results show that the centroid position deviation is directly caused by the oblique incidence of the detected laser, and the focal shift of cat-eye optical lens plays a more important role in the increase of the centroid position deviation.

Impact Analysis of Beam Auto Precision Guided Detection Based on Cat-Eye Effect

This paper contributes a theoretical model about cat-eye effect of target optical systems, and analyzes the impacts caused by the optical properties of the optical target, the precision guided detection system, and the atmospheric transmission to the beam auto precision guided detection based on the cat-eye effect. It provides the theoretical and technical basis to design and develop a precision guided system for a laser.

猫眼效应回波的动态成像探测与目标识别

猫眼效应回波的动态成像探测与目标识别

Light intensity at the return place and encirclement power ratio for the distorted reflected beambased oncat-eye effect

Based on the definition of second order moment and the approximate three-dimensional analytical formula for probe detected laser beam passing through a cat-eye optical lens with center shelter and oblique detector, the analytical expression of the encirclement power ratio of the cat-eye effect reflected light under far-field condition has been deduced. Variable laws of light intensity at the return place and encirclement power ratio are performed by numerical calculation, and are analyzed physically. The results show that the light intensity at the return place decreases monotonically with the increases of the diameter, incidence angle, tilted angle of the detector and the center shelter ratio, but the relationships between these parameters and the encirclement power ratio are all nonmonotonic. The reasonable choice of the focal shift size would result in the largest light intensity at the return place and the largest erirclenent power ratio.

畸变猫眼效应反射光束的回程传输特性

畸变猫眼效应反射光束的回程传输特性

猫眼效应用于激光主动探测技术的研究现状与发展趋势

猫眼效应用于激光主动探测技术的研究现状与发展趋势

大角度斜入射情况下的猫眼效应激光反射特性

大角度斜入射情况下的猫眼效应激光反射特性

离焦光学镜头的猫眼效应反射光干涉特性研究

离焦光学镜头的猫眼效应反射光干涉特性研究

Research on the mechanism of reflection characteristics of laser irradiation on cat eye optical lens

Using the theory of matrix optics and expanding the aperture function into a sum of finite complex Gaussian functions, this paper theoretically deduces the mechanism of cat eye effect generated by laser irradiation on the cat eye optical lens and analyzes the reflection law of cat eye effect through numerical computation. Then an experiment is operated to validate the cat eye effect by making 532nm laser irradiate on an optical zoom lens whose focusis ranged between 12 and 72mm. By using the above method, the law governing the variation of laser reflection characteristics with the parameters of the transmitting laser beam and the cat eye optical lens, including aperture, focus and focal shift etc, is established. The study reveals that the reflection characteristics of cat eye effect are intimately correlated with the parameters of the cat eye optical lens and transmitting laser beam, furthermore, the characteristics would change obviously when there is a large change in the distance between the waist of the incident beam and the cat eye optical lens. In particular, a reasonable choice of the positive focal shift would result in a higher peak intensity at the return place than that of no focal shift, when the distance between the waist of the incident beam and the cat eye optical lens varies, whereas the former conclusion based on geometry optics was that the highest peak intensity could be obtained when the optical lens has no focal shift.

Rotor Phenomena in the Lee of Mountains

The rotors are explained as a simple “cat's eye effect”, or transformation of a stationary wave motion into a system of vortices in the vicinity of a level where the basic wind velocity is vanishing. Some other applications of this same effect to phenomena of smaller or larger scale are also given. DOI: 10.1111/j.2153-3490.1955.tb01173.x