Research on the light field modulation technology of the laser-beam riding guidance system

2020 ◽  
Author(s):  
Gang Li ◽  
Fuyu Huang ◽  
Jiaju Ying ◽  
Yu-dan Chen ◽  
Ye Yu ◽  
...  
Keyword(s):  
Laser Beam ◽  
Light Field ◽  
Guidance System ◽  
Field Modulation

Adaptive phase correction for phase measuring deflectometry based on light field modulation

2021 ◽  
pp. 1-1
Author(s):  
Zhenqi Niu ◽  
Xiangchao Zhang ◽  
Junqiang Ye ◽  
Lu Yea ◽  
Rui Zhu ◽  
...  
Keyword(s):  
Light Field ◽  
Phase Correction ◽  
Field Modulation

scholarly journals Application of light diffraction theory to qualify the downstream light field modulation property of mitigated KDP crystals

2021 ◽  
Vol 138 ◽  
pp. 106873
Author(s):  
Hao Yang ◽  
Jian Cheng ◽  
Zhichao Liu ◽  
Qi Liu ◽  
Linjie Zhao ◽  
...  
Keyword(s):  
Light Field ◽  
Diffraction Theory ◽  
Light Diffraction ◽  
Field Modulation ◽  
Kdp Crystals

Design and Prototype Development of Quadrant Estimation Unit for Laser Beam Rider Guidance System

2020 ◽  
Vol 9 (03) ◽  
pp. 24970-24977
Author(s):  
Dr. Gunti Avinash ◽  
Saiseshu Reddy ◽  
P. Vijaya Poojitha
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Low Cost ◽  
Essential Element ◽  
Guidance System ◽  
Target Space ◽  
Laser Guidance ◽  
Atmospheric Transmission ◽  
Silicon Photodiode ◽  
Prototype Development

With the development of science and technology, precision-strike weapons are been considered to be important for winning victory and defending the country during war (or) attack. Laser guidance is one of the major methods to execute precision-strike in modern warfare. At present, the problems faced at the primary stage of Laser guidance has been solved with endeavors of countries. Several technical aspects of laser-beam riding guided system have been mature, such as atmosphere penetration of laser beam, clutter inhibition on ground, laser irradiator, encoding and decoding of laser beam. Further, laser beam quality, equal output power and atmospheric transmission properties are qualified for warfare situation. Riding guidance instrument is a crucial element of Laser-beam riding guided system and also in Radar-beam riding guiding system, and is also a essential element of airborne, vehicle-mounted and individual weapon. The optical system mainly consists of sighting module and laser-beam guided module. Photo detector (Quadrant detector) is the most important sensing device, and also the key to acquire the coordinate information of target space. Currently, in consideration of the 1064 nm of wavelength applied in all the semi-active laser guided weapons systems, lithium drifting silicon photodiode which is sensitive to 1064 nm of wavelength is used in photoelectric detector. Compared to Solid and gas laser, diode laser has many merits such as small volume, simple construction, light weight, long life, low cost and easy modulation.  The present work includes the study of Various ATGM, their guidance mechanism, particularly laser beam rider guidance. Study has been carried to understand the composition and operating principle of Laser-beam riding guided system. The present work also deals with prototype development of quadrant estimation unit required for Laser beam rider guidance.

scholarly journals A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 921 ◽  
Author(s):  
Min Fu ◽  
Changli Li ◽  
Ge Zhu ◽  
Hailin Shi ◽  
Fan Chen
Keyword(s):  
High Precision ◽  
Light Field ◽  
Light Transmission ◽  
Low Cost ◽  
Optimization Method ◽  
Spatial Modulation ◽  
Displacement Sensor ◽  
High Precision Measurement ◽  
Object Movement ◽  
Field Modulation

A new displacement sensor with light-field modulation, named as time grating, was proposed in this study. The purpose of this study was to reduce the reliance on high-precision measurements on high-precision manufacturing. The proposed sensor uses a light source to produce an alternative light-field simultaneously for four groups of sinusoidal light transmission surfaces. Using the four orthogonally alternative light-fields as the carrier to synthesize a traveling wave signal which makes the object movement in the spatial proportion to the signal phase shift in the time, the moving displacement of the object can be measured by counting time pulses. The influence of the light-field distribution on sensor measurement error was analyzed in detail. Aimed to reduce these influences, an optimization method that used continuous cosinusoidal light transmission surfaces with spatially symmetrical distribution was proposed, and the effectiveness of this method was verified with simulations and experiments. Experimental results demonstrated that the measurement accuracy reached 0.64 μm, within the range of 500 mm, with 0.6 mm pitch. Therefore, the light-field time grating can achieve high precision measurement with a low cost and submillimeter period sensing unit.

scholarly journals Generation Method Of Laser Beam Riding Guidance Information Field Based On Optical Phased Array

2018 ◽  
Vol 232 ◽  
pp. 04045
Author(s):  
Peiyang Wang ◽  
Jialin Ai ◽  
Wenbin Yan ◽  
Yudian An
Keyword(s):  
Laser Beam ◽  
Phased Array ◽  
Complex Structure ◽  
Guidance System ◽  
New Method ◽  
Weapon Systems ◽  
Optical Phased Array ◽  
Mechanical Devices ◽  
Guidance Information

Laser beam riding guidance was a new concept of guidance technology put forward in 1970s. It is widely used in various laser guided weapon systems. The technology of generating information field in the laser beam riding guidance system is the key of the system. However, the traditional laser beam riding guidance technology needs complex mechanical devices for the generation of guidance information field, optical zoom control and so on. There are many problems, such as the complex structure and it is difficult to guarantee the precision. In this paper, Optical Phased Array (OPA) is used to explore a new method of generating laser beam riding information field, which can realize the non-inertia and rapid deflection control of the beam.

scholarly journals DETERMINATION OF THE ACOUSTO-OPTICAL DEFLECTOR PARAMETERS FOR A LASER-RADIATION ROCKET GUIDANCE SYSTEM

2021 ◽  
pp. 17-22
Author(s):  
Oleg K. Kucherenko
Keyword(s):  
Laser Beam ◽  
Modulation Frequency ◽  
Bragg Diffraction ◽  
Guidance System ◽  
Pulse Code Modulation ◽  
Optical Deflector ◽  
Code Modulation ◽  
Problematic Issue ◽  
Mechanical Devices ◽  
Acoustic Losses

The work is devoted to the development of an acousto-optic deflector for a laser-beam guidance system (LLSN) of missiles. LLSN is used in semiautomatic portable missile systems to destroy hostile targets of various types. An analysis of the methods for constructing such systems has shown that the most promising devices with pulse-code modulation using semiconductor pulsed lasers. The article provides a diagram and describes the principle of operation of the LLSN with pulse-code modulation. A problematic issue in the implementation of such a system is the development of a device for deflecting a laser beam, through which the missile is guided to a target. Scanning mechanical devices that are currently in use have a complex design, significant dimensions and weight, and limited performance. The article proposes to use an acousto-optic deflector to deflect the laser beam within the information field of the guidance system, which is devoid of these disadvantages, since it replaces the mechanical scanning device with an electronic one. The purpose of the article is to determine the main parameters of the acousto-optical deflector. The article discusses the principle of operation of an acousto-optic deflector. It is noted that glasses based on germanium chalcogenides, in particular, glass with the composition Ge2.17As39.13S58.70, have especially low values of acoustic losses (α <1 dB / cm). The largest deflection angle of the laser beam will be observed with Bragg diffraction. Relationships are given that can be used to determine the main characteristics of the deflector: the angle of deflection of the laser beam, the modulation frequency of the acoustic wave, resolution, speed, and others. When using the above ratios for the typical parameters of the existing guidance system, the values of the indicated characteristics are calculated.

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