远程测温装置测量误差及其现场校验

分析了影响远程测温装置测量误差的主要因素,明确了用热电阻正确测量及减小回路各项干扰是保证测温精度的前提.并指出热电阻测温系统现场校验的注意事项.     

用于数字测温计的电流源特性分析

文章通过对用铂热电阻作为测温传感器存在着阻值随温度变化呈非线性的特性,提出了一种电流源电路,使得在测温时将被测信号转变成电压信号过程中实现非线性校正,从而实现测温的数字化.     

热电阻自热效应的分析与估算

本文介绍了热电阻自热效应的概念,并分析了自热效应对测温的影响程度,最后叙述在测温仪表应用中,对自热效应引起测温附加误差的考虑。     

现场检定温度变送器的几点经验

一、热电阻温度变送器 热电阻测温是根据检测导体或半导体电阻值随温度的变化而变化来测量温度的.在使用中热电阻一般安装在现场,电阻值通过输出引线连接到中央控制室来进行温度监控.由于现场和中央控制室一般距离较远,所以需要对连接导线的电阻值予以修正.同时,由于冬夏季温差较大,修正值也不相同.这对于需要远传的要求准确测温的现场温度测量来说很不方便,所以化工企业一般使用将电动温度变送器和热电阻装配到一起的热电阻温度变送器仪表来进行现场温度检测.该仪表将现场热电阻测量的电阻值就地转换成（4～20）mA的电流信号进行传输,以避免由于导线压降和导线阻值带来的测量误差,给使用带来很大的方便.     

铂热电阻温度传感器非线性校正方法与电路设计

介绍铂电阻温度传感器非线性补偿的一种方法。给出铂电阻线性测温的设计原理和实际电路，运用数字原理对铂热电阻测温电路进行研究，为铂热电阻的非线性补偿方法提供理论依据。     

基于铂热电阻测温系统设计

铂热电阻信号调理器ADT70可以将因温度变化引起的铂热电阻的电阻变化转换成电压信号.采用ADT70设计了一个8通道测温系统.该系统由ADT70、单片机MSP430F149、存储器、显示、接口等组成,采用普通的薄膜式铂热电阻就可以测量-50℃～+200℃的温度范围.     

高精度数字多用表在铂热电阻测温中的应用

高精度数字多用表（61/2位以上）具有显示直观、操作简单、携带方便等优点,自上世纪90年代以来,在铂热电阻测温中得到越来越广泛的应用.     

热电阻测温的计算机校正方法

本文提出了一种基于IPC610工控机的铂热电阻自动测温校正系统,根据被测温度的解析解,将温度信号的A/D转换值直接代入求得被测温度,从而克服铂热电阻的非线性,该系统具有现场校正的功能,可消除电源电压,扩大电路及引线电阻等对测量精度的影响,可以扩大测量范围。     

汽轮机用测温元件的发展方向

由于工业铂热电阻生产工艺的进步．铂热电阻的应用领域正在扩大。在电站汽轮机测温要求高精度．高可靠性的领域，铂热电阻将成为最主要的测温元件。本文着重介绍了铂热电阻生产技术的最新发展，并与现用的铜热电阻和铠装热电偶的性能进行比较。     

干式计量炉对不同类型测温传感器校准误差影响的探讨

目前干式计量炉校准测温传感器已经在工业上大量普遍使用,但相关的测量系统仍缺乏整体校准方案,存在不同装置获得的测量结果一致性较差等问题.本文通过校准不同类型测温传感器的实验,探讨了不同装置对校准测温传感器的误差影响大小.经过实验验证,干式计量炉可校准尺寸和孔径匹配的中低温热电偶传感器,且采用辅助措施减少测量误差,也可校准部分热电阻传感器.     

低温推进剂的温度控制

通过对低温火箭三子级地面试验和多次飞行试验的分析及国外有关资料的报导，总结出影响低温推进剂温度的相关因素及控制方法，对新型的增压系统及温控技术进行了展望。     

高温立申试验温度辅助装置温度校准的探讨

以温度校准工作中的实际为例,将高温拉伸试验温度辅助装置温度校准为主要研究对象,依据相关规范,利用测量公式,通过实测数据,对高温拉伸试验温度辅助装置温度校准进行探讨,计算出扩展不确定度,为今后温度校准工作积累相关经验.     

低温箱箱体内温度校验方法探讨

文章对低温箱箱体内温度校验进行了具体分析，并提供了校验方法。     

恒温槽温场温度均匀度的测试

分析采用温度计交换法对恒温槽温场温度分布均匀度的测试与计算方法。     

Temperature Control and Simulation of TemperatureAltitude Test System

The temperatureAltitude Test System (TATS) supplies various testing environments. The traditional PID method controls the temperature in TATS TemperaturePressure Cabin (TPC) over a long adjusting time and with a large overshoot. In order to solve this problem simply, a temperature control strategy with temperature difference corresponding factors is presented through a dynamic analysis and modeling of TPC temperature change. The TPC temperature descending process is simulated, and the results show that this control strategy can allot the proportion of PID heating controller and PID cooling controller in the whole control process and TPC temperature can be controlled at a set point quickly and effectively.     

Measuring Temperature in Pipe Flow with Non-Homogeneous Temperature Distribution

Accurate temperature measurements in flow lines are critical for many industrial processes. It is normally more a rule than an exception in such applications to obtain water flows with inhomogeneous temperature distributions. In this paper, a number of comparisons were performed between different 100 ohm platinum resistance thermometer (Pt-100) configurations and a new speed-of-sound-based temperature sensor used to measure the average temperature of water flows with inhomogeneous temperature distributions. The aim was to achieve measurement deviations lower than 1 K for the temperature measurement of water flows with inhomogeneous temperature distributions. By using a custom-built flow injector, a water flow with a hot-water layer on top of a cold-water layer was created. The temperature difference between the two layers was up to 32 K. This study shows that the deviations to the temperature reference for the average temperature of four Pt-100s, the multisensor consisting of nine Pt-100s, and the new speed-of-sound sensors are remarkably lower than the deviation for a single Pt-100 under the same conditions. The aim of reaching a deviation lower than 1 K was achieved with the speed-of-sound sensors, the configuration with four Pt-100s, and the multisensor. The promising results from the speed-of sound temperature sensors open the possibility for an integrated flow and temperature sensor. In addition, the immersion depth of a single Pt-100 was also investigated at three different water temperatures.