共查询到20条相似文献,搜索用时 562 毫秒
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PASCO转动运动传感器可以精准地测量并实时地记录物体转动时的角速度。在落体法测量刚体转动惯量的实验中,为了提高实验的精度,将PASCO转动运动传感器与刚体转动惯量实验仪相结合,用PASCO转动运动传感器直接测量角速度并计算角加速度。改进后的仪器简化了实验步骤,提高了实验精度。对圆盘、圆环和圆柱试样的转动惯量进行测量,三组实验的相对误差分别为0.2%、0.7%和0.3%,实验结果准确。通过实验结果可得,改进后的实验仪器操作简单且测量精度很高。 相似文献
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《中国光学与应用光学文摘》2004,(4)
提出了一种采用光学投影成像和自扫描光电二极管列阵(SSPA)传感器实现隐形眼镜曲率、光学中心厚度和直径测量的新方法,基于此方法设计成功了一种新型隐形眼镜投影测量仪。介绍了仪器的测量原理、仪器结构、光电二极管列阵信号采集以及单片机控制系统的硬件和软件设计。该测量仪测量镜片曲率半径的精度优于士0.1 mm,测量镜片光学中心厚度的 相似文献
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微幅摆重力加速度仪采用容栅尺位移传感器测量摆长变化量,提高了测量精度,避免了摆球尺寸及重心偏移量的影响,微摆幅设计与高精度的计时装置,能使该仪器更准确地测量单摆的摆动周期,提高重力加速度的测量精度. 相似文献
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介绍了一种利用游标卡尺和游标角度尺所组合成的新型器具进行非接触法距离的测量,从理论上和实际操作上对仪器可能达到的精度和产生的误差,以及如何减少误差提高精度进行了分析和描述。 相似文献
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物理实验中,作角度、距离、微小长度……的测量时,常用望远镜、读数显微镜等助视光学仪器。为了对准和测量,这类光学仪器的镜筒上,装着刻有十字线(或标尺)的分划板。人所共知,测量前应先调焦,使通过目镜能看到被测物的清晰象,为提高测量精度,物镜所成的象应和十字线(或标尺)准确共面。初次使用助视光学仪器的学生,调节清晰的象并不难做到,但共面无视差的调节则 相似文献
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Having adopted several sets of new technology and techniques, we have developed a new type of laser angle sensor that can be used to measure two-dimensional (2D) angle of moving target. On this basis, a new design for 2D acceleration laser sensor has been advanced. The optics-type sensor can be used to measure 2D acceleration of motion object, and it has high sensitivity, high precision and longer measuring range. Under these design parameters that are given in this paper, the measuring range will achieve 177 g, while its sensitivity is 13.5 s2. The experimental results show that the measuring error is not greater than 0.1 g. In this paper, several design parameters and measuring results for 2D acceleration laser sensor are given. 相似文献
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Having adopted several sets of new technology and techniques, such as cube-corner prism of higher refractive index, orthogonal holographic grating, non-linear compensation, and fringe fractionization, etc., we have developed a new type of laser angle sensor that can be used to measure two-dimensional angle of moving target. The sensor has high sensitivity, high precision and longer measuring range compared with the original sensor, and its measuring range will achieve ±35°, while its minimum resolution angle is 0.004°. The experimental results show that the measuring error is not greater than ±0.01°. In this paper, several design parameters and measuring results for 2D laser angle sensor are given. 相似文献
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W. H. Steel 《Optics and Lasers in Engineering》1983,4(4):217-227
The autostigmatic microscope is an instrument for measuring the line-of-sight distance to a reflecting surface and is used chiefly to measure the radii of lens surfaces. Special techniques can increase considerably its precision and its freedom from scattered light. 相似文献
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Saleska SR Shorter JH Herndon S Jiménez R McManus JB Munger JW Nelson DD Zahniser MS 《Isotopes in environmental and health studies》2006,42(2):115-133
Better quantification of isotope ratios of atmosphere-ecosystem exchange of CO2 could substantially improve our ability to probe underlying physiological and ecological mechanisms controlling ecosystem carbon exchange, but the ability to make long-term continuous measurements of isotope ratios of exchange fluxes has been limited by measurement difficulties. In particular, direct eddy covariance methods have not yet been used for measuring the isotopic composition of ecosystem fluxes. In this article, we explore the feasibility of such measurements by (a) proposing a general criterion for judging whether a sensor's performance is sufficient for making such measurements (the criterion is met when the contribution of sensor error to the flux measurement error is comparable to or less than the contribution of meteorological noise inherently associated with turbulence flux measurements); (b) using data-based numerical simulations to quantify the level of sensor precision and stability required to meet this criterion for making direct eddy covariance measurements of the 13C/12C ratio of CO2 fluxes above a specific ecosystem (a mid-latitude temperate forest in central Massachusetts, USA); (c) testing whether the performance of a new sensor-a prototype pulsed quantum cascade laser (QCL) based isotope-ratio absorption spectrometer (and plausible improvements thereon)-is sufficient for meeting the criterion in this ecosystem. We found that the error contribution from a prototype sensor (approximately 0.2 per thousand, 1 SD of 10 s integrations) to total isoflux measurement error was comparable to (1.5 to 2x) the irreducible 'meteorological' noise inherently associated with turbulent flux measurements above this ecosystem (daytime measurement error SD of approximately 60% of flux versus meteorological noise of 30-40% for instantaneous half-hour fluxes). Our analysis also shows that plausible instrument improvements (increase of sensor precision to approximately 0.1 per thousand, 1 SD of 10 s integrations, and increased sensor stability during the half-hour needed to integrate eddy covariance measurements) should decrease the contribution of sensor error to the point where it is less than the contribution from meteorological noise. This suggests that new sensors using QCL-based isotope ratio absorption spectroscopy should make continuous long-term observations of the isotopic composition of CO2 fluxes via eddy covariance methods feasible. 相似文献
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用弹簧测试仪对弹簧的特性进行测试和控制是保证产品质量的重要措施。弹簧测试仪由测试工作台和测试系统组成,工作台采用组合式结构,测试系统采用主从式结构,主机和从机之间通过RS-232串口实现通讯。采用应变式力传感器和光栅传感器分别对弹簧力和弹簧变形进行了测量。应用虚拟仪器技术对系统进行了设计,采用了多种软、硬件相结合的抗干扰措施。结果表明,研制的弹簧测试仪具有操作方便、人机交互友好、速度快、测试精度高、性能稳定等特点。 相似文献
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基于DSP处理器,利用超声波传感器、温度传感器、微型水深传感器,设计了一款智能导盲仪,该导盲仪具有测距、测积水深度、测温、智能求救等功能,并具有语音播报、夜晚警戒灯等感知与提示功能。本文重点阐述微型水深传感器在此导盲仪中的应用,实验结果证明,该微型水深传感器能够有效测量路面积水深度,检测精度高,为盲人雨天出行提供安全保障。 相似文献