Modified Methods for Image Processing of Laser Beam Profiles

Modified Methods for Image Processing of Laser Beam Profiles

Sergii Bilan (Onseo Company, Ukraine)
DOI: 10.4018/978-1-7998-1290-6.ch008

Abstract

The chapter is devoted to the analysis of the object of the study and highlighted its features as a means of information processing. The review of the existing methods of processing images of the profiles of laser beams, the principles of the operation of systems on the basis of similar algorithms, an analysis of the accuracy of the determination of the energy and geometric centers of the beam of laser beam, its diameter, and the differences of laser radiation are carred out. On the basis of the introduced criterion for estimating the symmetry of the contour of an image of a laser profile, a method for finding the optimal center for such an image is proposed. A comparative software model of effective methods for analysis of laser radiation parameters, namely, the search for laser image contour centers and the determination of the diameter of a laser beam, was constructed.
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Description And Subjects Of The Research Object

Indisputable factor in the development of our society is the introduction of laser technologies into all areas of human activity. Such an implementation, according to all existing indicators, is first of all implemented in systems where there is a problem of accuracy and speed of transmission and processing of information (Fig. 1) (Goodman, 2017; Shack, & Platt, 1971; Pennington, 1993; Welsh, Roggemann, Ellerbroek, & Pennington, 1995; Vasiliev, Sumerin, Chervonkin,. et al., 2002; Chervonkin, Nabokin, & Hyppenen, 2006; GOST 26086–84, 1984). The introduction of laser and optoelectronic devices can eliminate a number of shortcomings that are present in purely electronic systems (Goodman, 2017; Shack, & Platt, 1971; Pennington, 1993; Welsh, Roggemann, Ellerbroek, & Pennington, 1995; Vasiliev, Sumerin, Chervonkin,. et al., 2002; Chervonkin, Nabokin, & Hyppenen, 2006; GOST 26086–84, 1984; Dakin, & Brown, 2017; Piprek, 2017; Dutta, & Zhang, 2018).

Figure 1.

Classification of tasks that arise when processing images of laser profiles

978-1-7998-1290-6.ch008.f01

But the use of laser devices to improve the accuracy of the operation of laser location systems, aiming systems, open optical communication systems, etc. imposes tight requirements for both the laser as well as the optical-mechanical means that form and direct the laser beam in the required manner.

From this point of view, the laser becomes the base node of the entire system. Therefore, when they are manufactured, strict control of all its parameters is carried out, which is carried out by different methods and technologies.

One of the approaches to controlling the parameters of lasers, when they are aligned, is a technique based on the evaluation of the characteristics of the image of the profile of the laser beam (GOST 26086–84). According to such technology, accurate estimation of the energy and geometric centers, forms (perimeter values, diameters, shape distortions, etc.) of a laser beam, energy dissipation, etc. is achieved.

But the methods and means currently in use, which use such technologies, as a rule do not give the desired result (Goodman, 2017; Shack, & Platt, 1971; Pennington, 1993; Welsh, Roggemann, Ellerbroek, & Pennington, 1995; Vasiliev, Sumerin, Chervonkin,. et al., 2002; Chervonkin, Nabokin, & Hyppenen, 2006; GOST 26086–84, 1984; Dakin, & Brown, 2017; Piprek, 2017; Dutta, & Zhang, 2018). First, they use sophisticated algorithms (GOST 26086–84; Kovzel, Timchenko, Kutaev, et. Al. 2006) and hardware that worsen precision, since they do not always take into account “deep” distortion of the shape of the spots, reducing the number of suitable images in the track (package of cuts of the beam). Also, existing methods use system training (GOST 26086–84; Kovzel, Timchenko, Kutaev, et. Al. 2006; Timchenko, Kokriatskaia, Yarovyy, & Denysova, 2013; Yarovyy, Timchenko, & Kokriatskaia, 2012) to further process images. Such algorithms need to be improved. So the problem is not removed.

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