共查询到19条相似文献,搜索用时 203 毫秒
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随着激光测振仪使用场景和测量范围的不断扩大,其校准也愈发重要。但依据目前测振仪校准标准,无法实现高频高速环境下的整机校准,因此迫切需求完善此方面的校准方法。近几年,研究人员将非机械调制光用于测振仪校准测试中,构建了理论模型并取得了校准试验数据。本文对这些理论模型和试验数据进行了分析,根据光调制产生位置和核心调制器件的不同对相关方法进行了分类,同时对其工作原理、系统结构组成和主要参数等进行介绍,再对比分析不同方法的校准功能与适用范围,最后展望了相关方法的发展潜力和研究方向,为测振仪校准技术进一步研究提供了借鉴。 相似文献
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《中国计量学院学报》2015,(4):399-405
激光测振仪广泛应用于国防、精密机械制造、汽车等领域,对其校准技术和方法的研究尤为重要.介绍激光测振仪的工作原理,研究分析现有三种校准方法(机械运动信号校准法、调频电信号校准法、调频光信号校准法)的特点和不足.针对调频电信号校准法提出了直接与标准信号对比的方案,降低了对硬件设备的要求,提高了校准准确度和测量范围;针对调频光信号校准法无法溯源的问题,提出外源调频光信号校准法;因而为激光测振仪校准技术的进一步研究提供了方法借鉴. 相似文献
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《中国测试》2017,(1)
针对激光测振仪校准中存在自动化程度低的问题,设计激光测振仪的校准装置。介绍装置的硬件、软件设计,进行校准实验验证,测得实验数据并计算校准装置的不确定度。该装置通过所测量的实际值与理论值比较来校准激光测振仪。装置包含激励源部分、测量仪器部分、通信仪器部分和PC机,其中激励源提供标准振动信号和标准频率信号,测量仪器测得输出电压和波形,以GPIB接口作为通信仪器将PC机与激励源和测量仪器相连,PC机以虚拟仪器软件为开发平台,控制输入标准频率信号,采集和显示输出电压数据和波形结果,实现激光测振仪的自动化校准。实验证明装置性能良好,数据真实可靠,误差低于1%,符合规程要求。 相似文献
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为了开展冲击力校准装置下压电式力传感器动态灵敏度的校准,介绍了基于自由落体的落锤冲击力模型和基于空气轴承悬浮支撑的水平式质量块冲击碰撞的模型;通过4阶Butterworth低通滤波,研究加速度信号波形的滤波平滑,比较了不同截止频率的滤波效果;通过激光测振仪和标准加速度计测量加速度的对比试验,研究加速度绝对测量法与比较测量法对力传感器动态灵敏度校准精度的影响。试验结果表明,激光测振仪测量加速度须通过微分解调,要选择合适上限截止频率的4阶Butterworth低通滤波器进行滤波平滑处理;激光干涉绝对法复现的动态力精度为2%,加速度计比较法复现的动态力精度为4%;激光干涉绝对法校准的灵敏度波动性比加速度计比较法校准的灵敏度波动性小。 相似文献
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超低频标准振动系统基础设计技术 总被引:1,自引:0,他引:1
针对超低频标准振动系统易受外界振动干扰的问题,研究了超低频标准振动台与激光测振仪的隔振基础设计技术.首先以振动台台面输出信噪比为出发点,确定了超低频标准振动台基础噪声的基本要求;然后采用有限元分析的数值方法,分别对振动台基础与激光测振仪基础作动力学分析,再对激光测振仪基础作静力学分析.结果表明,振动台基础底面应与地基刚性连接,而激光测振仪基础底面应与地基弹性连接;优化橡胶减震垫的布局可以提高激光测振仪隔震系统的稳定性. 相似文献
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本文介绍采用国产小型激振器(北京测振仪器厂生产的JX-1型加速度校准仪)校准标准加速度计的互易校准法,给出校准误差,并把校准结果与采用中频激光测振仪校准的结果进行比较。实验证明,使用该仪器可在60到200赫的频率范围内,达到与激光校准相同的准确度,约为±0.5%。 相似文献
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研究了桨叶对激光斩波标定算法,采用高速的CPLD逻辑阵列、36位计数器和高速DSP嵌入式信号处理系统以及通过算法程序引入非线性误差补偿来校准基准桨叶的共锥度参数;建立了直九型基准桨叶共锥度参数校准装置标定系统,其机理为利用模拟桨叶切割激光束,通过光电器件探测这一周期性的光电信号,从而对激光器定位参数进行标定;通过这套系统实现了基准桨叶共锥度参数的校准和溯源。 相似文献
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Moore KD 《Applied optics》2001,40(33):5991-6004
I present a method to calibrate absolutely a new family of underwater bathymetric laser scanner systems that use a single target range. Depth is calculated by triangulation among the source, the receiver, and the instantaneous position of a single spot produced by a highly collimated laser beam scanned across the target. For calibration, the refractive index of seawater is used to modulate the triangulation parameters rather than use of different target ranges to calibrate for extended range operation. Exploitation of a unique triangulation configuration allows the receiver characteristics to be ignored initially so that the scanner parameters can be determined. This allows the accurate positioning of the laser spot so that the receiver, in turn, can be calibrated. This intercalibration method provides high-resolution parameterization of the source-receiver characteristics and their geometric layout within the system so that an absolute bathymetric calibration can be realized in situ. In addition, a theoretical model derived to develop the methodology can be used to characterize and optimize future designs. 相似文献
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为保证激光测距仪的精度和可靠性,必须要对它进行定期检定.常用的检定法是在经过精密测量的野外基线场上采用六段比较法求得.而这种野外基线场需占用大量的土地资源,检定受地质条件、地理位置、地面建筑构造、气象与温度等环境因素的影响,并且野外作业工作量大,一直是国内外研究所关注的问题.本文通过利用光纤放入室内,代替野外基线来检测激光测距仪这一国内外所关注的问题进行了初步的理论分析与实验研究.分析了用作基线的光纤类型的选择以及耦合方式的选取,研究了耦合、光波、温度对光波在光纤中传输光程的影响.理论分析与实验验证基本符合,说明用光纤在室内代替野外基线来检定激光测距仪是可行的. 相似文献
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Using matrix-assisted laser desorption/ionization (MAL DI) on a trapped ion mass spectrometer such as a Fourier transform mass spectrometer (FTMS) allows accumulation of ions in the cell from multiple laser shots prior to detection. If ions from separate MALDI samples are accumulated simultaneously in the cell, ions from one sample can be used to calibrate ions from the other sample. Since the ions are detected simultaneously in the cell, this is, in effect, internal calibration, but there are no selective desorption effects in the MALDI source. This method of internal calibration with adjacent samples is demonstrated here on cesium iodide clusters, peptides, oligosaccharides, poly(propylene glycol), and fullerenes and provides typical FTMS internal calibration mass accuracy of < 1 ppm. 相似文献
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Accurate cantilever spring constants are important in atomic force microscopy both in control of sensitive imaging and to provide correct nanomechanical property measurements. Conventional atomic force microscope (AFM) spring constant calibration techniques are usually performed in an AFM. They rely on significant handling and often require touching the cantilever probe tip to a surface to calibrate the optical lever sensitivity of the configuration. This can damage the tip. The thermal calibration technique developed for laser Doppler vibrometry (LDV) can be used to calibrate cantilevers without handling or touching the tip to a surface. Both flexural and torsional spring constants can be measured. Using both Euler-Bernoulli modeling and an SI traceable electrostatic force balance technique as a comparison we demonstrate that the LDV thermal technique is capable of providing rapid calibrations with a combination of ease, accuracy and precision beyond anything previously available. 相似文献
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J. Apolinar Muñoz Rodríguez Francisco Carlos Mejía Alanís 《Journal of Modern Optics》2013,60(13):1219-1232
AbstractAn accurate technique to perform binocular self-calibration by means of an adaptive genetic algorithm based on a laser line is presented. In this calibration, the genetic algorithm computes the vision parameters through simulated binary crossover (SBX). To carry it out, the genetic algorithm constructs an objective function from the binocular geometry of the laser line projection. Then, the SBX minimizes the objective function via chromosomes recombination. In this algorithm, the adaptive procedure determines the search space via line position to obtain the minimum convergence. Thus, the chromosomes of vision parameters provide the minimization. The approach of the proposed adaptive genetic algorithm is to calibrate and recalibrate the binocular setup without references and physical measurements. This procedure leads to improve the traditional genetic algorithms, which calibrate the vision parameters by means of references and an unknown search space. It is because the proposed adaptive algorithm avoids errors produced by the missing of references. Additionally, the three-dimensional vision is carried out based on the laser line position and vision parameters. The contribution of the proposed algorithm is corroborated by an evaluation of accuracy of binocular calibration, which is performed via traditional genetic algorithms. 相似文献