工作用辐射温度计示值误差测量结果的不确定度评定

文章探讨了用辐射温度计检定装置测量工作用辐射温度计方法,分析工作用辐射温度计测量结果的不确定度来源,并对工作用辐射温度计示值误差测量结果的不确定度进行评定。     

环境辐射对辐射温度计测量结果的影响

在辐射温度计响应波长一定情况下,主要通过计算环境辐射对黑体辐射温度、发射率不为1辐射温度计的修正值,分析和讨论了在计量检定工作中环境辐射对辐射温度计测量结果的影响大小,并阐述了在结果计算中对它们进行修正的必要性和重要性。     

黑体辐射源发射率对辐射测温准确度的影响及修正方法

随着辐射温度计的广泛应用,对准确测量、校准或检定的要求越来越高.尽管黑体辐射源的性能不断提高,但黑体辐射源发射率偏离1仍然是影响辐射温度计校准/检定或相关应用准确度的关键问题.可是目前对辐射温度计的校准常常忽略黑体辐射源发射率偏离1的影响或在分析中采用不适当的计算.针对常见的辐射温度计,阐述了对黑体辐射源发射率的影响进行修正与不确定度评定的一般方法,对复杂的宽带辐射温度计提出可行的近似计算方法,并对最常见的8～14μm宽带辐射温度计给出了计算结果.分析结果表明,对于较长波长的辐射温度计,在中高温区的校准或检定中所经常使用黑体辐射源发射率值所引起的亮度温度误差是显著的,应予以修正.     

500℃以下工作用辐射温度计校准结果示值修正方法探讨

我国对工作用辐射温度计的校准使用《500℃以下工作用辐射温度计检定规程》和《工作用辐射温度计检定规程》,两本规程分别适用于温度范围在500℃以下和300～2200℃的工作用辐射温度计的检定。两本规程都规定,在检定过程中,对于温度计有发射率修正和调节功能的,应将发射率设置为1或将发射率设置为与辐射源靶面的有效发射率相同的数值。在实际工作中,很多工作用辐射温度计的发射率没有调节功能,恒为0．95,有的甚至没有标明发射率是多少,而一般计量部门的标准辐射源的发射率都为1．00。     

检定辐射温度计过程中应该注意的问题

辐射温度计近些年来使用得越来越多,使得许多省市计量机构都建立了检定该测温仪的标准。由于影响辐射温度计的准确性的因素比较多,文章对在检定辐射温度计过程中应该注意的问题进行了论述,并给出一些计算方法。     

发射率对辐射温度计检定结果的影响分析

在环境温度一定情况下,主要通过计算黑体辐射源发射率、辐射温度计发射率设定分别对特定响应波长辐射温度计测量结果修正值的大小,分析和讨论了在计量检定工作中发射率对辐射温度计测量结果的影响大小,并阐述了在结果计算中对它们进行修正的必要性和重要性。     

测量距离影响辐射温度计检定结果的实验研究

针对测量距离对辐射温度计检定结果的影响进行了实验研究，给出了几种所选择的常用的辐射温度计的实验数据和分析图表。确定了辐射温度计的最佳测量距离是在离开黑体辐射源靶面0.3~0.5 m范围内。     

工作用辐射温度计测量结果的不确定度评定

本文参照常用测量不确定度评定方法及应用实例,依据JJC415-2001《工作用辐射温度计检定规程》和工作经验,对工作用辐射温度计测量结果的不确定度进行了评定。     

漫谈红外辐射测温仪

介绍红外辐射测温仪的测温原理、特点和广应用及检定状况,辐射温度计检定中存在的问题.     

工作用辐射温度计测量结果的不确定度评定

一、概述依据JJG415-2001《工作用辐射温度计》检定规程,以一等铂铑10-铂热电偶为标准,对西玛仪表厂生产的AR350型辐射温度计在1000℃点进行测量,经过分析计算可得到该辐射温度计在各点的实际值。二、数学模型T=t-Δt式中:T——辐射温度计在1000℃时的实际值,℃;t——辐射温度计测量时读数的平均值,℃;Δt——测量时标准热电偶偏离检定点温度的值,℃。     

The present ICRP protection quantitites are seriously flawed. Opposing the proposition

Our debaters have agreed to defend positions that appear to be diametrically opposed; nevertheless, they have acknowledged some common ground. Although it was not explicitly stated, they would no doubt agree that workers and the public are adequately protected by our present system of radiation regulations. Our debaters have overtly agreed that it would be desirable to have measurable radiation protection quantities. Whether or not this is advantageous, or even possible, will depend upon which argument swayed your opinion. The ICRP is presently examining its recommendations and will, over the next few years, update those recommendations. Therefore, the contributions of our debaters will surely be relevant to this process.     

中国标准化历史系列连载之三

At the times of Industrial Revolution in Europe, China was experiencing the backward development in economy and society, and thus standards and standardization were inevitably outdated.Although China was one of the founders of ISO in 1947 when the International Organization for Standardization (ISO) was set up, in the next 30 years, China has drifted away outside of the activities of international standardization as a result of the civil war and planned economy.     

《圆锥壳结构声振耦合特性分析》

通过利用LMS virtual.lab中的Acoustic BEM模块实现了FE/BE 声振耦合模型的仿真计算,且计算结果通过了混响噪声实验验证。在此基础之上,分析圆锥壳结构的声振耦合特性,并与不考虑声场的结构响应的情况进行了比较分析。结果表明声场的存在影响结构的响应幅值与分布,且耦合程度在不同频率下表现出不同特性。     

Radiation safety systems for accelerator facilities

The radiation safety system RSS) of an accelerator facility is used to protect people from prompt radiation hazards associated with accelerator operation. The RSS is a fully interlocked, engineered system with a combination of passive and active elements that are reliable, redundant and fail-safe. The RSS consists of the access control system (ACS) and the radiation containment system (RCS). The ACS is to keep people away from the dangerous radiation inside the shielding enclosure. The RCS limits and contains the beam/radiation conditions to protect people from the prompt radiation hazards outside the shielding enclosure in both normal and abnormal operations. The complexity of an RSS depends on the accelerator and its operation. as well as associated hazard conditions. The approaches of RSS among different facilities can be different. This report gives a review of the RSS for accelerator facilities.     

On the development of the new harmonised damage stability regulations for dry cargo and passenger ships

This paper outlines the methodological background and presents a summary of the main results of a series of undertaken international, IMO-led studies, on the harmonisation of the new probabilistic, risk-based regulations with the currently in-force regulatory provisions for assessing the damage stability of dry cargo and passenger ships. It reviews the historical development of the new regulations, to be applied to all new buildings on January 1, 2009, and the anticipated impact of the new rules on the design and indirect operation of various subcategories of dry cargo and passenger ships. It identifies certain loopholes in the existing regulations that appear cured by the new ones, though certain compromises adopted in the development of the new regulations, particularly those related to large passenger ships’ survivability, have left some open issues to be addressed in the near future.     

A proposed injection system for HLS

Hefei synchrotron radiation Light Source (HLS) presently has three kickers for electron injection. It is a lattice-dependent system, and different lattices will form different shapes of bump orbits. In the upgrading of HLS, a compact, lattice-independent injection system will be adopted. This paper looks into the possibilities of using quadrupole-magnet trim coils to produce assistant DC injection bumps and then to decrease the required amplitude of kicker bump. Some calculation results of injection schemes are discussed.     

气象强制性标准与法律法规的协调性研究

根据最新征求意见的《标准化法》和国家强制性标准整合精简的实践,我国强制性标准应是基于法定目的,有法律法规依据而制定的国家标准。强制性标准依附于法律法规存在,对其具有支撑作用。我国强制性标准与法律法规协调应借鉴单轨制的协调模式,严格限定强制性标准的范围,更多地通过法律法规引用标准或预先授权制定标准的方式形成强制性标准。气象强制性标准在与法律法规协调性方面存在标准的法律法规依据不明确等问题,需要建立二者的长效协调机制。     

障板上矩形薄板在浅水环境中的振动及声辐射解析分析

通过推导得到浅水环境中矩形板声辐射阻抗矩阵的解析表达,进一步结合振动假设模态方法及辐射表面单元辐射器思想求解浅水环境中矩形板的振动响应,分析水深对矩形板模态附加质量的影响,给出矩形板模态附加质量随水深的变化情况,得到波导模态的激发对附加质量的影响,并通过对辐射抗矩阵的特征分析得到附加质量在板上分布的主要模式;进一步结合声辐射模态辐射效率,分析水深变化对矩形板振动响应峰值及远场声辐射的影响,分析结果表明:水深度变化对振动响应峰值及声辐射功率的影响与第1阶声辐射模态的辐射效率随深度的变化具有一致性。     

Radiation safety impact for top-up operation at the NSRRC

Radiation safety impact for the upcoming top-up operation at the National Synchrotron Radiation Research Center (NSRRC) has been investigated with emphasis on the consequence of injection efficiency. Keeping the storage ring at high stored current by frequent injections, the top-up operation will inevitably increase the radiation dose compared with that in the present decay mode, especially when the injection efficiency is low. In addition, significantly high level of radiation could stream through the ratchet wall openings during top-up injections while shutters are open. Therefore, a series of radiation safety analyses including calculations and measurements have been carried out to assess the feasibility of this mode on the prospective radiation protection. The paper summarises the evaluation and the corresponding action plans for radiation safety.