Fabian N. Murrieta-Rico

Bio: Fabian N. Murrieta-Rico is an academic researcher from National Autonomous University of Mexico. The author has contributed to research in topics: Inertial navigation system & Accelerometer. The author has an hindex of 9, co-authored 45 publications receiving 286 citations. Previous affiliations of Fabian N. Murrieta-Rico include Ensenada Center for Scientific Research and Higher Education & Universidad Politécnica de Baja California.

Mobile robot vision system using continuous laser scanning for industrial application

Abstract: The purpose of this paper is the presentation and research of a novel robot vision system, which uses laser dynamic triangulation, to determine three-dimensional (3D) coordinates of an observed object. The previously used physical operation principle of discontinuous scanning method is substituted by continuous method. Thereby applications become possible that were previously limited by this discretization.,The previously used prototype No. 2, which uses stepping motors to realize a discontinuous laser scan, was substituted by the new developed prototype No. 3, which contains servomotors, to achieve a continuous laser scan. The new prototype possesses only half the width and turns out to be significantly smaller and therefore lighter than the old one. Furthermore, no transmissions are used, which reduce the systematic error of laser positioning and increase the system reliability.,By using a continuous laser scan method instead of discontinuous laser scan method, dead zones in the laser scanner field can be eliminated. Thereby, also by changing the physical operation principle, the implementation of applications is allowed, which previously was limited by the fixed step size or by the object distance under observation. By using servomotors instead of stepping motors, also a significant reduced positioning time can be accomplished maintaining the relative positioning error less than 1 per cent.,The originality is based on the substitution of the physical operation principle of discontinuous by continuous laser scan. The previously used stepping motors discretized the laser scanner field and thereby produced dead zones, where 3D coordinates cannot be detected. These stepping motors were substituted by servomotors to revoke these disadvantages and provide a continuous laser scan, where dead zones in the field of view get eliminated and the step response of the laser scanner accelerated.

Exact laser beam positioning for measurement of vegetation vitality

Abstract: Purpose The purpose of this paper is to present a novel application for a newly developed Technical Vision System (TVS), which uses a laser scanner and dynamic triangulation, to determine the vitality of agriculture vegetation. This vision system, installed on an unmanned aerial vehicle, shall measure the reflected laser energy and thereby determine the normalized differenced vegetation index. Design/methodology/approach The newly developed TVS shall be installed on the front part of the unmanned aerial vehicle, to perform line-by-line scan in the vision system field-of-view. The TVS uses high-quality DC motors, instead of previously researched low-quality DC motors, to eliminate the existence of two mutually exclusive conditions, for exact positioning of a DC motor shaft. The use of high-quality DC motors reduces the positioning error after control. Findings Present paper emphasizes the exact laser beam positioning in the field-of-view of a TVS. By use of high-quality instead of low-quality DC motors, a significant reduced positioning time was achieved, maintaining the relative angular position error less than 1 per cent. Best results were achieved, by realizing a quasi-continuous control, using a high pulse-width modulated duty cycle resolution and a high execution frequency of the positioning algorithm. Originality/value The originality of present paper is represented by the novel application of the newly developed TVS in the field of agriculture. The vitality of vegetation shall be determined by measuring the reflected laser energy of a scanned agriculture zone. The paper’s main focus is on the exact laser beam positioning within the TVS field-of-view, using high-quality DC motors in closed-loop position control configuration.

Continuous 3D scanning mode using servomotors instead of stepping motors in dynamic laser triangulation

Abstract: A novel principle of dynamic triangulation with a laser scanner was developed at the institute of engineering UABC. This coordinate measurement method uses stepping motors for positioning a laser in a defined field of view. The present paper describes the substitution of these stepping motors with robust controlled servomotors in open- and closed-loop configuration. This approach converts the discontinuous (i.e. discrete steps) scanning method into a continuous one, to eliminate dead zones in the field of view and to accelerate the step response of the laser scanner.

Unmanned Aerial Vehicles in Agriculture: A Review of Perspective of Platform, Control, and Applications

Abstract: For agricultural applications, regularized smart-farming solutions are being considered, including the use of unmanned aerial vehicles (UAVs). The UAVs combine information and communication technologies, robots, artificial intelligence, big data, and the Internet of Things. The agricultural UAVs are highly capable, and their use has expanded across all areas of agriculture, including pesticide and fertilizer spraying, seed sowing, and growth assessment and mapping. Accordingly, the market for agricultural UAVs is expected to continue growing with the related technologies. In this study, we consider the latest trends and applications of leading technologies related to agricultural UAVs, control technologies, equipment, and development. We discuss the use of UAVs in real agricultural environments. Furthermore, the future development of the agricultural UAVs and their challenges are presented.

Chiral Coordination Polymers with SHG-Active and Luminescence: An Unusual Homochiral 3D MOF Constructed from Achiral Components, Crystal Growth & Design, 2013, 13(6), 2650-2660.

Abstract: Six new coordination polymers, namely, [Cd(SO4)(4-abpt)(H2O)]n·3nH2O (1), [Cu3(CN)3(4-abpt)2]n (2), [Cd(D-cam)(2-PyBIm)(H2O)]n (3), [Co(D-Hcam)(cptpy)]n (4), [Cd(D-cam)(btmb)]n (5), and [Cd2(D-cam)(L-cam)(btmbb)]n (6) (4-abpt = 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole, D-H2cam = d-camphoric acid, 2-PyBIm = 2-(2-pyridyl)benzimidazole, Hcptpy = 4′-(4-carboxyphenyl)-3,2′:6′,3″-terpyridine, btmb = 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene, btmbb = 4,4′-bis(1,2,4-triazol-1-ylmethyl)-1,1′-biphenyl), have been synthesized under hydro(solvo)thermal conditions. Their structures were determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, infrared spectra, powder X-ray diffraction, circular dichroism, and thermogravimetric analysis. Complex 1 features a 3D porous metal–organic framework, which is a rare example to obtain a homochiral compound from achiral components. Complex 2 exhibits a 2D polymeric network constructed from μ2-cyanide, μ2-4-abpt, and monodentate 4-a...

Solvothermal Synthesis, Structure, and Properties of Metal Organic Framework Isomers Derived from a Partially Fluorinated Link Published as part of a virtual special issue on Structural Chemistry in India: Emerging Themes

Abstract: Solvothermal reactions of Cu(NO3)23 3H2O with 4,4 0 -(hexafluoroisopropylidene) bis(benzoic acid) (C17H10F6O4 ,H 2hfbba) and terminal monodentate ligand 3-methyl pyridine (3-picoline/3-mepy) in the presence of N, N-dimethyl formamide (DMF) and N,N-diethyl formamide (DEF) solvents gave rise to two structurally different two- dimensional (2D) fluorinated metal organic frameworks (F- MOFs). The effect of the choice of solvent has been clearly reflected in the structures obtained. The F-MOFs reported in this paper are formulated as (Cu2(hfbba)2(3-mepy)2) 3 (DMF)2(3- mepy) (F-MOF-4), (Cu2(hfbba)2(3-mepy)2)(Cu-F-MOF-4B), and (Zn2(hfbba)2(3-mepy)2) 3 (3-mepy) (Zn-F-MOF-4B) which displays interesting 2D structures with and without interdigitation depending on the solvent used. The structures of these F-MOFs have been determined by X-ray crystallography and further identified by IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). The effect of interdigitation has been reflected in the gas adsorption and magnetic properties of these F-MOFs. These F-MOFs also show comparable H2 and CO2 uptake depending on their structural variation. Temperature- dependent magnetic susceptibility measurements over a wide range of temperatures exhibit dominantly short-range antiferromag- netic behavior, with weak ferromagnetic behavior showing up at very low temperatures, which is evident from opening of the hysteresisloopwitha finitevalueofcoercivityinbothF-MOF-4andCu-F-MOF-4B.Weobservedasmallervalueof μeffperCuatom andcoercivityinCu-F-MOF-4BthantheF-MOF-4duetorelativelylargerdistancesbetweentheneighboringdicopperpaddlewheel secondary building unit.

Mobile robot vision system using continuous laser scanning for industrial application

Abstract: The purpose of this paper is the presentation and research of a novel robot vision system, which uses laser dynamic triangulation, to determine three-dimensional (3D) coordinates of an observed object. The previously used physical operation principle of discontinuous scanning method is substituted by continuous method. Thereby applications become possible that were previously limited by this discretization.,The previously used prototype No. 2, which uses stepping motors to realize a discontinuous laser scan, was substituted by the new developed prototype No. 3, which contains servomotors, to achieve a continuous laser scan. The new prototype possesses only half the width and turns out to be significantly smaller and therefore lighter than the old one. Furthermore, no transmissions are used, which reduce the systematic error of laser positioning and increase the system reliability.,By using a continuous laser scan method instead of discontinuous laser scan method, dead zones in the laser scanner field can be eliminated. Thereby, also by changing the physical operation principle, the implementation of applications is allowed, which previously was limited by the fixed step size or by the object distance under observation. By using servomotors instead of stepping motors, also a significant reduced positioning time can be accomplished maintaining the relative positioning error less than 1 per cent.,The originality is based on the substitution of the physical operation principle of discontinuous by continuous laser scan. The previously used stepping motors discretized the laser scanner field and thereby produced dead zones, where 3D coordinates cannot be detected. These stepping motors were substituted by servomotors to revoke these disadvantages and provide a continuous laser scan, where dead zones in the field of view get eliminated and the step response of the laser scanner accelerated.