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Simulation of Optimal Design of a Cooled Diaphragm of a Thermal Imaging Camera 红外热像仪冷却膜片优化设计模拟
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040076
A. R. Novoselov, S. V. Khryashchev, P. A. Aldokhin, P. P. Dobrovol’skii, K. P. Shatunov

Abstract

Irradiation of a cooled matrix photodetector by parasitic radiation in a cryostat for different shapes and designs of a cold diaphragm is numerically simulated. It is found that the optimal shape of a cold diaphragm is a cylinder with two internal optics diaphragms (additional diaphragms). Irradiation of the matrix photodetector by parasitic radiation is about (9{.}82times 10^{-5}) W (cdot) cm({}^{-2}) with an uneven distribution over the area of about 3(%).

摘要数值模拟了不同形状和设计的冷隔膜在低温恒温器中对冷却矩阵光电探测器的寄生辐射。结果发现,冷隔膜的最佳形状是带有两个内部光学隔膜(附加隔膜)的圆柱体。寄生辐射对矩阵光电探测器的辐照约为(9{.}82times 10^{-5}) W(cdot) cm({}^{-2}) ,在约3(%)的面积上分布不均。
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引用次数: 0
Non-Asymptotic Confidence Estimation of the Autoregressive Process Paremeters in the Case of an Unknown Noise Variance 未知噪声方差情况下自回归过程帕雷米特的非渐近可信度估计
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040106
S. E. Vorobeychikov, A. V. Pupkov

Abstract

A non-asymptotic procedure of constructing the confidence region of the parameter of the (p)-th order Gaussian autoregressive process AR(p) in the case of an unknown process noise variance is considered. The confidence estimation procedure is based on the martingale property of the numerator of estimate deviation of the least square technique (LST). The results of numerical modeling are presented.

摘要 在未知过程噪声方差的情况下,考虑了构建 (p)-th 阶高斯自回归过程 AR(p)参数置信区域的非渐近过程。置信度估计程序基于最小平方技术(LST)估计偏差分子的马氏特性。文中给出了数值建模的结果。
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引用次数: 0
Acquisition and Control System for Flowing Liquid Laser 流动液体激光的采集和控制系统
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040131
Rajeev Kumar Dohare, Mainuddin, Gaurav Singhal

Abstract

In latest field deployable defence applications, development of a flowing medium liquid laser source is still a grey area and is multidisciplinary in nature with scant available data in terms of laser medium parameters and involves numerous technological challenges. Uniform flow of circulating active medium, safety concern during circulation, maintaining the temperature of the liquid lasing medium, power supply to the pumping source i.e., laser diode stack, real time display of critical parameters, flow regulation during experiments, remote operation and actuation for some event to be happen are some of them. All these are achieved using one key of 100 channel single window customized acquisition and control system with varying sampling rates from 100 samples/s to 200 ksamples/s and 16 bit resolution based on wireless interface. This paper discusses interfacing of acquisition and control system (ACS) to the liquid aprotic laser subsystems with proper safety interlocking and remote operation (35 m through five, one feet concrete walls and 80 m through, one feet concrete wall) with portable features.

摘要 在最新的可实地部署的国防应用中,流动介质液体激光源的开发仍然是一个灰色领域,具有多学科性质,激光介质参数方面的可用数据很少,并涉及众多技术挑战。其中包括:循环活性介质的均匀流动、循环过程中的安全问题、保持液体激光介质的温度、向泵浦源(即激光二极管堆栈)供电、关键参数的实时显示、实验过程中的流量调节、远程操作以及发生某些事件时的驱动。所有这些都是通过基于无线接口的 100 通道单窗口定制采集和控制系统来实现的,该系统的采样率从 100 样本/秒到 200 ks 样本/秒不等,分辨率为 16 位。本文讨论了采集和控制系统(ACS)与液体沸腾激光子系统的接口,以及适当的安全联锁和远程操作(35 米穿过五道一英尺高的混凝土墙和 80 米穿过一英尺高的混凝土墙),并具有便携式功能。
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引用次数: 0
Accounting for the Influence of the Corrector Hysteresis on the Dynamic Characteristics of Adaptive Optics Systems 解释校正器迟滞对自适应光学系统动态特性的影响
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040064
V. P. Lukin

Abstract

This paper continues the analysis of the dynamic characteristics of adaptive optics systems operating in a turbulent atmosphere, in particular, the influence of such an important factor of an active corrector mirror as its hysteresis. The requirements for the dynamic parameters of the feedback loop of the adaptive system for laser radiation focusing through a turbulent atmosphere are calculated using an analytical approach. The possibilities of using control algorithms in adaptive optics systems based on the description of their operation as a constant delay control system are considered. The corrector mirror model used takes into account the time delay between the time of the signal and the time of its processing. The operation frequency of the adaptive optics system is estimated using an analytical expression relating the maximum achievable correction level in the Strehl parameter with the most important parameters of the system: the accuracy and operation frequency of the wavefront sensor, the size of the optical system aperture, and atmospheric parameters: the Fried parameter and wind speed. Differences between two types of tracking loops are analyzed: open and closed loops in adaptive optics systems.

摘要 本文继续分析在湍流大气中运行的自适应光学系统的动态特性,特别是有源校正镜的一个重要因素--迟滞的影响。使用分析方法计算了激光辐射聚焦自适应系统反馈回路动态参数的要求,该系统可通过湍流大气聚焦激光辐射。在将自适应光学系统的运行描述为恒延迟控制系统的基础上,考虑了在自适应光学系统中使用控制算法的可能性。所使用的校正镜模型考虑到了信号时间与信号处理时间之间的时间延迟。自适应光学系统的工作频率是通过一个分析表达式估算出来的,该表达式将斯特雷尔参数中可达到的最大校正水平与系统的最重要参数联系起来:波前传感器的精度和工作频率、光学系统孔径的大小以及大气参数:弗里德参数和风速。分析了自适应光学系统中开环和闭环两种跟踪环路之间的差异。
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引用次数: 0
Energy-Saving Control in Distributed Parameter Systems with Uniform Estimates of Target Sets 分布式参数系统中的节能控制与目标集的统一估计
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040088
E. Ya. Rapoport, Yu. E. Pleshivtseva, I. S. Levin

Abstract

We propose a method for synthesizing energy-optimal controllers in open and closed domains of space-time control actions for linear multidimensional objects with distributed parabolic parameters under the conditions of a given accuracy of uniform approximation of the final state of the system to the desired spatial distribution of the controlled variable. The approach is based on the previously developed alternance method for constructing parameterizable algorithms of optimal program control, which uses the fundamental laws of the subject area. It is shown that the desired equations of the controllers are reduced to linear feedback laws with restrictions on incomplete observation of the state of the object with nonstationary transmission coefficients, which are determined by preliminary calculation of the program control action.

摘要 我们提出了一种方法,用于在系统最终状态与所需受控变量空间分布的均匀近似精度给定的条件下,在具有分布式抛物线参数的线性多维对象时空控制行动的开放和封闭域中合成能量最优控制器。该方法基于之前开发的交替法,用于构建可参数化的最优程序控制算法,其中使用了该主题领域的基本规律。结果表明,控制器的理想方程可以简化为线性反馈定律,并限制对具有非稳态传输系数的对象状态的不完全观测,而这些系数是通过初步计算程序控制动作确定的。
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引用次数: 0
Methods of Constructing Functional Observers for Nonlinear Dynamic Systems 构建非线性动态系统功能观测器的方法
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s875669902304012x
A. N. Zhirabok, A. V. Zuev, A. E. Shumskii

Abstract

The problem of constructing functional observers for dynamic systems described by nonlinear differential equations subjected to external disturbances is considered. The presented relationships allow one to construct a lower-dimensional observer that is insensitive to disturbances and estimates the given function of the state vector. The theoretical results are illustrated by an example.

摘要 本文探讨了为受外部干扰的非线性微分方程描述的动态系统构建功能观测器的问题。所提出的关系允许我们构建一个对干扰不敏感的低维观测器,并估计状态向量的给定函数。通过一个例子说明了理论结果。
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引用次数: 0
Search for the Optimal Initial Concentrations of Catalytic Reaction Compounds on the Basis of a Kinetic Model 根据动力学模型寻找催化反应化合物的最佳初始浓度
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040027
E. V. Antipina, S. A. Mustafina, A. F. Antipin

Abstract

A numerical algorithm of search for the optimal initial concentration of catalytic reaction compounds that combines kinetic modelling with evolutionary calculations was developed. The problem of optimal control over a catalytic reaction, where the control parameter is the vector of the initial concentrations of reagents was formulated. A stepwise algorithm of solving the formulated problem on the basis of the differential evolution method was described. Numerical experiment was performed for the reaction of thiols aminomethylation with tetramethylmethanediamine. The described algorithm was used to calculate the optimal concentrations of reagents that provided the highest concentration of the reaction product. The calculated initial concentrations were shown to agree with chemical experiment results.

摘要 开发了一种结合动力学建模和进化计算的催化反应化合物最佳初始浓度搜索数值算法。提出了催化反应的最优控制问题,其中控制参数是试剂初始浓度的矢量。在微分进化法的基础上,描述了逐步解决所提出问题的算法。对硫醇氨基甲基化与四甲基甲二胺的反应进行了数值实验。所描述的算法用于计算可提供最高反应产物浓度的最佳试剂浓度。计算得出的初始浓度与化学实验结果一致。
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引用次数: 0
Schemes of Combining Discriminant Functions to Improve the Classification Accuracy for Ensemble of Data Sources 提高数据源集合分类准确性的判别函数组合方案
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040052
M. M. Lange, S. V. Paramonov

Abstract

Data classification accuracy is studied in terms of a relation between the error probability and the processed amount of information for different fusion schemes. The fusion schemes for weak discriminant functions are considered on an equimodal dataset and on an ensemble of data from multimodal sources. For the proposed fusion schemes, the error probability redundancy is estimated with respect to the information-theoretic lower bound in the form of a modified rate distortion function with the Hamming distortion metric. The experimental estimates obtained on the datasets of face and signature images demonstrate a decrease in the error probability and its redundancy with respect to the lower bound by increasing the processed amount of information due to the fusion of weak discriminant functions.

摘要 根据错误概率与不同融合方案所处理的信息量之间的关系,研究了数据分类的准确性。在等模态数据集和多模态数据集合上考虑了弱判别函数的融合方案。对于所提出的融合方案,错误概率冗余是根据信息论下限进行估算的,信息论下限的形式是具有汉明失真度量的修正率失真函数。在人脸图像和签名图像数据集上获得的实验估算结果表明,由于弱判别函数的融合,增加了处理的信息量,从而降低了错误概率及其相对于下限的冗余度。
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引用次数: 0
Software Module of Hashing User Biometric Data 用户生物识别数据散列软件模块
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-12 DOI: 10.3103/s8756699023040039
A. S. Ismagilova, N. D. Lushnikov

Abstract

Peculiarities of the automated realization of hashing biometric personal data, information resources of a user, and the information system in general are considered. The basis of the created mathematical model is an artificial neural network intended for hashing biometric images in the account administrator folder with the use of mathematical methods. The object of investigation is information systems. The subject of investigation is the means of information security with the use of biometric multifactor authentication.

摘要 考虑了自动实现哈希个人生物识别数据、用户信息资源和整个信息系统的特殊性。所创建数学模型的基础是一个人工神经网络,旨在利用数学方法对账户管理员文件夹中的生物识别图像进行散列。研究对象是信息系统。研究对象是使用生物识别多因素身份验证的信息安全手段。
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引用次数: 0
The Gerchberg–Papoulis Method in Low-Angle Optical Hilbert Diagnostics of Phase Structures 相结构低角度希尔伯特光学诊断中的格希伯格-帕普利斯方法
IF 0.4 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2023-12-10 DOI: 10.3103/s8756699023050138
E. V. Arbuzov, V. A. Arbuzov, Yu. N. Dubnishchev, O. S. Zolotukhina, M. M. Lapikov, V. V. Lukashov

Abstract

The possibility of processing small-view hilbertograms by the Gerchberg–Papoulis method to restore the spatial distribution of the refractive index was studied. The method consists in iterative transitions from the function estimates in the frequency and coordinate spaces with correction based on a priori information. Numerical modeling of the refractive index reconstruction for various test functions by the Gerchberg–Papoulis method using the Radon data, known for four angles, has been carried out. Using a four-angle tomographic complex implemented on the basis of a modified IAB-463M shadow device, experimental studies were carried out by the example of optical Hilbert diagnostics of reacting media in a high-speed shooting mode (up to 2000 frames per second).

摘要 研究了用 Gerchberg-Papoulis 方法处理小视角希尔伯特图以恢复折射率空间分布的可能性。该方法包括从频率和坐标空间的函数估计值进行迭代转换,并根据先验信息进行修正。利用已知的四个角度的 Radon 数据,通过 Gerchberg-Papoulis 方法对各种测试函数的折射率重建进行了数值建模。利用在改进的 IAB-463M 阴影装置基础上实施的四角断层摄影综合装置,以高速拍摄模式(每秒多达 2000 帧)对反应介质进行希尔伯特光学诊断为例,开展了实验研究。
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引用次数: 0
期刊
Optoelectronics Instrumentation and Data Processing
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