scholarly journals Assessment of Temperature Effects in Interior Orientation Parameters Calibration of Optoelectronic Devices

2020 ◽  
Vol 11 (2) ◽  
pp. 122-131
Author(s):  
M. A. Starasotnikau
Keyword(s):  
Spatial Structure ◽  
Temperature Effects ◽  
Optoelectronic Devices ◽  
Digital Camera ◽  
Optoelectronic Device ◽  
Warm Up ◽  
Constant Change ◽  
Measuring Scale ◽  
Array Position ◽  
Orientation Parameters

A digital micromirror device (DMD) micromirrors periodic spatial structure is a measuring scale in interior orientation parameters calibration of optoelectronic devices problems, when using a DMD as a testobject. It is important that DMD micromirrors periodic spatial structure remains constant. Change in a DMD micromirrors spatial structure may occur due to heating. In addition to heating a DMD, an optoelectronic device photodetector is also subject to heating and, accordingly, change in its spatial structure. It is necessary to estimate change in a spatial structure of DMD micromirrors and an optoelectronic device photodetector.A DMD micromirrors spatial drift and a DMD micromirrors spatial drift together with a digital camera photodetector pixels spatial drift for operation 4 h are analyzed. The drift analysis consisted in the points array position assessing formed by a DMD and projected onto a digital camera. When analyzing only a DMD micromirrors drift, a digital camera was turned on only for shooting time for exclude digital camera influence. A digital camera did not have time to significantly heat up, during this time. After a digital camera it cooled to a room temperature.Average drift of all DMD micromirrors determines the accuracy of interior orientation parameters calibration of optoelectronic devices using a DMD in time. Maximum drift of all micromirrors after switching on is observed. Minimum DMD warm-up time is 60 min for average drift of all micromirrors less than 1 μm is necessary. Minimum DMD warm-up time is 120 min when using a DMD together with a digital camera is necessary.A DMD expansion uniformity determines the accuracy of interior orientation parameters calibration of optoelectronic devices using a DMD, because irregular expansion disturbs micromirrors periodicity. The average change in distance of neighboring points is less than 0.1 μm for every 20 min.Thus, a DMD can be used as a test-object in interior orientation parameters calibration of optoelectronic devices. The results can be used as compensation coefficients of change in DMD micromirrors spatial structure due to temperature effects during operation, if more accurate are necessary. 

scholarly journals Novel Two-Dimensional Layered MoSi2Z4 (Z = P, As): New Promising Optoelectronic Materials

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 559
Author(s):  
Hui Yao ◽  
Chao Zhang ◽  
Qiang Wang ◽  
Jianwei Li ◽  
Yunjin Yu ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Incident Light ◽  
Optoelectronic Devices ◽  
Large Family ◽  
Middle Layer ◽  
Optoelectronic Device ◽  
First Principles Calculation ◽  
Polarization Angle ◽  
Two Dimensional ◽  
Conducting Materials

Very recently, two new two-dimensional (2D) layered semi-conducting materials MoSi2N4 and WSi2N4 were successfully synthesized in experiments, and a large family of these two 2D materials, namely MA2Z4, was also predicted theoretically (Science, 369, 670 (2020)). Motivated by this exciting family, in this work, we systematically investigate the mechanical, electronic and optical properties of monolayer and bilayer MoSi2P4 and MoSi2As4 by using the first-principles calculation method. Numerical results indicate that both monolayer and bilayer MoSi2Z4 (Z = P, As) present good structural stability, isotropic mechanical parameters, moderate bandgap, favorable carrier mobilities, remarkable optical absorption, superior photon responsivity and external quantum efficiency. Especially, due to the wave-functions of band edges dominated by d orbital of the middle-layer Mo atoms are screened effectively, the bandgap and optical absorption hardly depend on the number of layers, providing an added convenience in the experimental fabrication of few-layer MoSi2Z4-based electronic and optoelectronic devices. We also build a monolayer MoSi2Z4-based 2D optoelectronic device, and quantitatively evaluate the photocurrent as a function of energy and polarization angle of the incident light. Our investigation verifies the excellent performance of a few-layer MoSi2Z4 and expands their potential application in nanoscale electronic and optoelectronic devices.

scholarly journals Multifunctional Optoelectronic Devices: Multifunctional Optoelectronic Device Based on an Asymmetric Active Layer Structure (Adv. Funct. Mater. 17/2019)

2019 ◽  
Vol 29 (17) ◽  
pp. 1970114
Author(s):  
Beitao Ren ◽  
Gancheong Yuen ◽  
Sunbin Deng ◽  
Le Jiang ◽  
Dingjian Zhou ◽  
...  
Keyword(s):  
Active Layer ◽  
Layer Structure ◽  
Optoelectronic Devices ◽  
Optoelectronic Device

scholarly journals INVESTIGATION INTO THE BEHAVIOUR AND MODELLING OF CHROMATIC ABERRATIONS IN NON-METRIC DIGITAL CAMERAS

2019 ◽  
Vol XLII-2/W18 ◽  
pp. 99-106 ◽  
Author(s):  
D. D. Lichti ◽  
D. Jarron ◽  
M. Shahbazi ◽  
P. Helmholz ◽  
R. Radovanovic
Keyword(s):  
Digital Camera ◽  
Chromatic Aberration ◽  
Bundle Adjustment ◽  
Lens Distortion ◽  
Digital Cameras ◽  
Principal Point ◽  
Common Object ◽  
Chromatic Aberrations ◽  
The Impact ◽  
Orientation Parameters

Abstract. Chromatic aberration in colour digital camera imagery can affect the accuracy of photogrammetric reconstruction. Both longitudinal and transverse chromatic aberrations can be effectively modelled by making separate measurements in each of the blue, green and red colour bands and performing a specialized self-calibrating bundle adjustment. This paper presents the results of an investigation with two aims. The first aim is to quantify the presence of chromatic aberration in two sets of cameras: the six individual cameras comprising a Ladybug5 system, calibrated simultaneously in air; and four GoPro Hero 5 cameras calibrated independently under water. The second aim is to investigate the impacts of imposing different constraints in the self-calibration adjustment. To this end, four different adjustment cases were performed for all ten cameras: independent adjustment of the observations from each colour band; combined adjustment of all colour bands’ observations with common object points; combined adjustment of all colour bands with common object points and common exterior orientation parameters for each colour band triplet; and combined adjustment with common object points and certain common interior orientation parameters. The results show that the Ladybug5 cameras exhibit a small (1-2 pixel) amount of transverse chromatic aberration but no longitudinal chromatic aberration. The GoPro Hero 5 cameras exhibit significant (25 pixel) transverse chromatic aberration as well as longitudinal chromatic aberration. The principal distance was essentially independent of the adjustment case for the Ladybug5, but it was not for the GoPro Hero 5. The principal point position and precision were both affected considerably by adjustment case. Radial lens distortion was invariant to the adjustment case. The impact of adjustment case on decentring distortion was minimal in both cases.

scholarly journals OPTOELECTRONIC AMPLIFIER REGULATORS FOR AFS-FILM

2019 ◽  
Author(s):  
R. Naimanboyev ◽  
M. Tokhirov ◽  
M. Sobirov
Keyword(s):  
Automatic Control ◽  
Phase Angle ◽  
Optoelectronic Devices ◽  
Optoelectronic Device ◽  
Control Device ◽  
Practical Application

The paper discusses the practical application of AFS films to systems of optoelectronic amplifiers. In particular optoelectronic devices controlled by AFS film. Optoelectronic device controlled AFS film. Optoelectronic amplifier with LED input. Optoelectronic automatic control device. Optoelectronic circuit phase angle control.

scholarly journals CALIBRATION OF NON-METRIC UAV CAMERA USING DIFFERENT TEST FIELDS

2021 ◽  
Vol 47 (3) ◽  
pp. 111-117
Author(s):  
Szymon Sobura
Keyword(s):  
Digital Camera ◽  
Research Area ◽  
Test Area ◽  
Test Field ◽  
Control Measurement ◽  
Object Distance ◽  
Camera Orientation ◽  
Spatial Test ◽  
Orientation Parameters

The paper deals with the calibration of a non-metric digital camera Nikon EOS 6D with a 50 mm lens that could be adapted as a potential UAV sensor for the purposes of aerial inspections. The determination of the internal orientation parameters and the image errors of the non-metric digital camera involved self-calibration with Agisoft Metashape software solving the network of the images obtained from different test fields: a chessboard field, a professional laboratory field and a spatially diverse research area. The results of the control measurement for the examined object distance of 6 meters do not differ significantly. The RMSE from the control measurement for the second analyzed object distance of 15 meters was calculated on the basis of the internal orientation elements. The images from the laboratory field, the spatial test area and the chessboard field were used, and the obtained results amounted to 7.9, 9.9 and 11.5 mm, respectively. The conducted studies showed that in the case of very precise photogrammetric measurements performed by means of the Nikon EOS 6D camera equipped with a 50 mm lens, it is optimal to conduct calibration in a laboratory test field. The greatest RMSE errors were recorded for the control images with the elements of the internal camera orientation calculated on the basis of the chessboard area. The results of the experiments clearly show a relation between the accuracy of the Nikon EOS 6D camera calibrations and the percentage of the frame area filled with the test field. This explains why the weakest calibration results were obtained from the chessboard test field.

Support and Temperature Effects in Platinum Clusters. 1. Spatial Structure

1996 ◽  
Vol 100 (40) ◽  
pp. 16310-16317 ◽  
Author(s):  
Boyan I. Boyanov ◽  
Timothy I. Morrison
Keyword(s):  
Spatial Structure ◽  
Temperature Effects ◽  
Platinum Clusters

scholarly journals Rapid Microwave Synthesis of Tunable Cadmium Selenide (CdSe) Quantum Dots for Optoelectronic Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Donovan Thomas ◽  
Harold O. Lee ◽  
Kevin C. Santiago ◽  
Marvin Pelzer ◽  
Ayodeji Kuti ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Selenide ◽  
Microwave Synthesis ◽  
Growth Process ◽  
Synthesis Method ◽  
Optoelectronic Devices ◽  
Optoelectronic Device ◽  
Cdse Qds ◽  
Emission Profile ◽  
Wide Range

Quantum dots (QDs) are a hot topic in optoelectronic device research, due to tailorable absorption and emission properties. Unfortunately, the conventional methods of QD synthesis are hazardous and time-consuming. In this work, we present an alternative method of fabricating cadmium selenide (CdSe) QDs (via rapid microwave synthesis). This novel fabrication method provides a quick and efficient way to synthesize QDs that are almost identical to those commercially available. We also demonstrate the tuning of QD sizes by varying time and temperature during the growth process. Optical spectroscopy was used to measure the emission profile of QDs of various sizes. With ease repeatability, tunability, and scalability, this QD synthesis method can be integrated into a wide range of applications and optoelectronic devices.

scholarly journals 3D Analysis of Upper Limbs Motion During Rehabilitation Exercises Using the KinectTM Sensor: Development, Laboratory Validation and Clinical Application

2018 ◽  
Author(s):  
Bruno Bonnechère ◽  
Victor Sholukha ◽  
Lubos Omelina ◽  
Serge Van Sint Jan ◽  
Bart Jansen
Keyword(s):  
Optoelectronic Devices ◽  
Optoelectronic Device ◽  
Functional Evaluation ◽  
3D Analysis ◽  
Upper Limbs ◽  
Step Method ◽  
Detection And Tracking ◽  
Measurement Results ◽  
Rehabilitation Exercises ◽  
3D Evaluation

Optoelectronic devices are gold standard for 3D evaluation in clinics but due to the complexity of such kind of hardware and the lack of access for patients affordable, transportable and easy to use systems must be developed to be largely used in daily clinics. The KinectTM sensor presents various advantages compared to optoelectronic devices: price, transportability but also some limitations: (in)accuracy of the skeleton detection and tracking as well as the limited amount of available points that make 3D evaluation impossible. To overcome these limitations a novel method has been developed to perform 3D evaluation of the upper limbs. This system is coupled to rehabilitation exercises allowing functional evaluation while performing physical rehabilitation. To validate this new approach a double step method was used. The first step is a laboratory validation where the results obtained with the KinectTM have been compared with results obtained with an optoelectronic device, 40 healthy young adults participated in this first part. The second step was to determine the clinical relevance of such kind of measurement. Results of the healthy subjects were compared with a group of 22 elderly adults and a group of 10 chronic stroke patients to determine if different patterns can be observed. The new methodology and the different steps of the validations are presented in this paper.

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