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4πγ电离室放射性核素活度计 总被引:1,自引:0,他引:1
利用4πγ电离室作为探测器的放射性核素活度计,采用超低输入偏流MOSFET场效应仪器放大器,设计了小电流测量电路,微电流的测量范围为10^-12A~10^-6A。给出了能量响应的电离室校准曲线。 相似文献
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根据谐波电流测试标准以及谐波电流测试仪标准的要求,设计一款综合电参量测试仪.该仪器作为电磁兼容测试的辅助仪器,可以有效降低测量结果的不确定度,并且改善谐波电流测试仪综合性能.通过该仪器在谐波电流测试中的实际应用,对谐波电流测试数据的深入分析,发现在标准的相关条款中存在一些与实际测试结果不相符合的情况,并给出两条对谐波标准的修改建议. 相似文献
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泄漏电流是电器产品的一项重要安全技术指标,因此电器产品在出厂前都要对其泄漏电流进行测试。根据有关标准规定,对泄漏电流测量的最大允许误差一般优于±5%。随着电器产品的不断发展,测试电器产品泄漏电流的测试仪种类也越来越多,为保证泄漏电流测试仪量值准确、可靠、统一,就要定期对其进行检定。为此我们曾采用“标准电流源法”设计出了检定泄漏电流测试仪的仪器——泄漏电流测试仪校验仪。然而,在实际的检定工作中,我们发现有一些泄漏电流测试仪用该仪器无法实现检定。一、设计方案的确立在JJG843-1993《泄漏电流测试仪》国家计量检定… 相似文献
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多通道电化学分析仪的研制及性能测试 总被引:1,自引:0,他引:1
针对生物、化学和环境领域对集成化分析仪器的需求,提出了具有多通道同步检测功能的电化学分析仪设计与制造方案,详细介绍了仪器的主要组成部分:函数发生器、恒电位仪、电流检测模块和USB接口的具体设计。本文并对所研制多通道仪器进行了电化学实验性能测试。结果表明,所设计和研制的多通道电化学分析仪完全能够满足电化学实验中多通道分析测试的需求。 相似文献
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马国华 《现代测量与实验室管理》2002,10(2):11-15
利用4πγ电离室作为探测器的放射性核素活度计,采用超低输入偏流MOSFET场效应仪器放大器,设计了小电流测量电路,微电流的测量范围为10-12A~10-6A.给出了能量响应的电离室校准曲线. 相似文献
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本文针对带有柔性电流探头仪器传统校准方法中存在的问题,在研究此类仪器的结构原理和功能特点的基础上,提出将主机和柔性电流探头分开校准的新方法。规划了主机、柔性电流探头和整机三个层次的实验内容,通过对实验结果的分析比较,验证了新方法的可靠性,为今后开展此类仪器的校准提供了参考方法。 相似文献
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设计了基于USB接口的测硫仪,重点对智能控制器中的电解电流控制模块、炉温控制模块和数据采集模块进行了介绍。利用热电偶实现炉温的测量,采用具有USB接口的微处理器完成测量过程的控制和数据传输任务,并设计了高精度的信号放大和数据采集电路来保证仪器的性能,同时还对测试结果进行了精度分析。结果表明,仪器的测量精度满足国家标准。 相似文献
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提出一种潜用光学系统白光透射比测量装置的设计方法,并根据该方法研制一套具有测量结果准确、功能齐全、操作方便的测量装置。用于实际测量的结果表明,该装置完全符合设计要求。 相似文献
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目的 为了提高中风和脑损伤患者在康复训练过程中的效率,对康复训练仪的设计做了一系列目标优化.方法 使用层次分析法(AHP)以及模糊综合评价(FCE)的方法,建立针对于康复训练仪的设计评价模型,围绕康复训练仪设计评价和方案决策两方面进行了研究.在设计评价方面,将康复训练仪的设计拆解成为不同的层次、不同的要素,采用定性和定量相结合的分析方法,计算并排序每个设计要素的权重.在方案决策方面,依据上阶段计算出的各要素权重值排序,运用模糊综合评价法对康复训练仪的设计方案进行评分,得到最完善、最优型的设计方案.结论 通过引入层次分析法和模糊综合评价在前期设计过程中的应用,能够有效地避免产品设计中的主观因素,为设计决策以及设计评价提供客观依据. 相似文献
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We discuss the influence of the deviation between the reference atmosphere and the actual atmosphere on the effective instrument function method for atmospheric remote sensing inversion and present an alternative method-the circulation method-that was developed from the effective instrument function method. The computation time for this method is greater than that of the effective instrument function method but does not need a priori information about atmospheric parameter profiles. 相似文献
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仪表着陆信号发生器是仪表着陆系统机载设备的专用检测设备,目前国内还没有公开发布的关于仪表着陆信号发生器的国家或行业范围内的检定/校准技术标准。本文通过对仪表着陆系统原理进行剖析,从仪表着陆信号发生器工作特点入手,对航向信标、下滑信标、指点信标等信号特点进行分析,给出了计量特性,并基于频谱分析仪直接测量法给出了各项计量特性的校准方法,同时对频谱分析仪引入的测量不确定度进行了分析,用GUM法评定了扩展不确定度。结果表明,给出的校准方法可满足仪表着陆信号发生器关键参数的校准需求,使用频谱分析仪校准符合仪表着陆信号发生器各计量特性的量值溯源要求。 相似文献
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Prelaunch characterization of the Ozone Monitoring Instrument transfer function in the spectral domain 总被引:1,自引:0,他引:1
A method and an experimental measurement setup to accurately characterize the instrument transfer function in the spectral domain for hyperspectral spectrometers in the ultraviolet-visible wavelength range are described. The application to the on-ground calibration of the Ozone Monitoring Instrument (OMI) on board the Earth Observing System Aura satellite is presented and discussed. With this method and setup, based on an echelle grating, a sampling of the instrument transfer function in the spectral domain can be selected and is not limited by the spectral resolution and sampling of the spectrometer that is being characterized. The importance of accurately knowing the OMI instrument transfer functions in the spectral domain for in-flight differential optical absorption spectroscopy retrievals and wavelength calibration is discussed. The analysis of the OMI measurement data is presented and shows that the instrument transfer functions in the spectral domain as a function of wavelength and viewing angle can be determined with high accuracy. 相似文献
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There is a growing need for sky radiometric measurements that encapsulate spatial as well as temporal variability. Since the advent of fast data acquisition systems in the 1980s, recent studies have utilized radiation filter instruments deployed in various sky-shading platforms. One cost effective method provides azimuthally averaged sky radiance distribution data at time scales down to fractions of a minute. Successful operation of this scheme requires knowledge of the apparent sky-view factor of the deployed sensor--an artifact of the instrument input optics, instrument filter design, and the instrument shading device employed. We provide a methodology for a determination of the sensor sky-view factor by using the employed shading device and the sun as a light source. The effect of an incorrect determination of instrument sky-view factor is also analyzed in context of the measurements. 相似文献
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We present what we believe to be a novel method for order sorting a Fabry-Perot interferometer using a Fourier transform spectrometer (FTS) in tandem. We demonstrate how the order sorting is achieved using a model instrument response as an example of an instrument working in the 5-25 microm band, although the method is generally applicable at all wavelengths. We show that an instrument of this type can be realized with a large bandwidth, a large field of view, and good transmission efficiency. These attributes make this instrument concept a useful technique in applications where true imaging spectroscopy is required, such as mapping large astronomical sources. We compare the performance of the new instrument to grating and standard FTS instruments in circumstances where the measurement is background and detector noise limited. We use a figure of merit based on the field of view and speed of detection and find that the new system has a speed advantage over a FTS with the same field of view in all circumstances. The instrument will be faster than a grating instrument with the same spectral resolution once the field of view is >13 times larger under high background conditions and >50 times larger with detector performances that match the photon noise from Zodiacal light. 相似文献