Temperature measurement error simulation of the pure rotational Raman lidar

2015 ◽  
Author(s):  
Jingyu Jia ◽  
Yong Huang ◽  
Zhirui Wang ◽  
Fan Yi ◽  
Jianglin Shen ◽  
...  
Keyword(s):  
Measurement Error ◽  
Temperature Measurement ◽  
Raman Lidar ◽  
Error Simulation

Stratosphere temperature measurement using Raman lidar

1990 ◽  
Vol 29 (34) ◽  
pp. 5182 ◽  
Author(s):  
Philippe Keckhut ◽  
M. L. Chanin ◽  
A. Hauchecorne
Keyword(s):  
Temperature Measurement ◽  
Raman Lidar

Effect of Fouling on Temperature Measurement Error and a Solution

1998 ◽  
Vol 120 (2) ◽  
pp. 525-528 ◽  
Author(s):  
Y. I. Cho ◽  
B.-G. Choi
Keyword(s):  
Control System ◽  
Heat Exchanger ◽  
Measurement Error ◽  
Process Control ◽  
Temperature Measurement ◽  
Process Control System ◽  
Scale Layer ◽  
Automated Process Control System ◽  
Temperature Reading ◽  
Automated Process

The objective of the present study was to investigate the effect of fouling on the accuracy of temperature measurement. When a thin scale layer is deposited on a temperature-measuring probe, the temperature reading can be in error by several degrees in spite of ± 0.1 K resolution of the probe. This erroneous temperature reading can pose a serious problem in the evaluation of heat exchanger performance and in the operation of an automated process control system.

Noise filtering of rotational Raman lidar using threshold amendment for atmospheric temperature measurement

2009 ◽  
Author(s):  
Weiguo Kong ◽  
Siying Chen ◽  
Yinchao Zhang ◽  
Tian Lan ◽  
Zongjia Qiu ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Atmospheric Temperature ◽  
Noise Filtering ◽  
Raman Lidar

Distortion in Thermal Field Around Inserted Thermocouples in Experimental Interfacial Studies, Part 4: End Effect

2000 ◽  
Vol 124 (1) ◽  
pp. 135-145 ◽  
Author(s):  
M. H. Attia ◽  
A. Cameron ◽  
L. Kops
Keyword(s):  
Finite Element ◽  
Measurement Error ◽  
Temperature Measurement ◽  
Three Dimensional ◽  
Thermal Characteristics ◽  
Solid Material ◽  
Filler Material ◽  
Sensing Element ◽  
Element Analysis ◽  
Parametric Finite Element Analysis

The main objective of this investigation is to develop a model for predicting the systematic temperature measurement error due to the thermal disturbance in the region surrounding the thermocouple hot junction. A parametric finite element analysis has been conducted to model the general case of a three-dimensional thermocouple installation inserted in a blind hole. The variables considered in this study are the level of the heat flux in the measurement zone, as well as the thermal characteristics of the thermocouple wires, the filler material (cement), and the solid material in which the installation is placed. Analysis of the results showed that the pattern of the disturbed temperature field around the thermocouple sensing element is critically dependent on the ratio between the thermal conductivities of the filler material and the solid material. The results also showed that a reduction in the temperature gradient in the undisturbed field results in a considerable increase in the partial heat flow into the thermocouple wires, and consequently a significant systematic temperature measurement error. The effect of the eccentric positioning of the thermocouple on the uncertainty limits of the measurement error was found to be quite significant. A generalized model is presented to estimate the measurement error for any combination of the thermocouple installation attributes. Experimental verification of some aspects of this analysis has been carried out using a well-controlled experiment in which the thermocouple hole is scale-modelled. Comparison of the test results with the finite element predictions confirmed the accuracy and validity of the numerical modelling and results.

scholarly journals Temperature Measurement Reliability and Validity With Thermocouple Extension Leads or Changing Lead Temperature

2010 ◽  
Vol 45 (6) ◽  
pp. 642-644 ◽  
Author(s):  
Lisa S. Jutte ◽  
Blaine C. Long ◽  
Kenneth L. Knight
Keyword(s):  
Measurement Error ◽  
Temperature Measurement ◽  
Laboratory Study ◽  
Reliability And Validity ◽  
Temperature Data ◽  
Water Bath ◽  
Measurement Reliability ◽  
Temperature Changes ◽  
Ice Pack

Abstract Context: Thermocouples' leads are often too short, necessitating the use of an extension lead. Objective: To determine if temperature measures were influenced by extension-lead use or lead temperature changes. Design: Descriptive laboratory study. Setting: Laboratory. Other Participants: Experiment 1: 10 IT-21 thermocouples and 5 extension leads. Experiment 2: 5 IT-21 and PT-6 thermocouples. Methods: In experiment 1, temperature data were collected on 10 IT-21 thermocouples in a stable water bath with and without extension leads. In experiment 2, temperature data were collected on 5 IT-21 and PT-6 thermocouples in a stable water bath before, during, and after ice-pack application to extension leads. Results: In experiment 1, extension leads did not influence IT-21 validity (P  =  .45) or reliability (P  =  .10). In experiment 2, postapplication IT-21 temperatures were greater than preapplication and application measures (P < .05). Conclusions: Extension leads had no influence on temperature measures. Ice application to leads may increase measurement error.

Temperature measurement decreasing measurement error caused by stray lights and unpredictable emissivity

2001 ◽  
Author(s):  
Tomomi Ino ◽  
Wataru Yamada ◽  
Hiromi Suzuki ◽  
Akira Tsumura ◽  
Yoshiaki Akama ◽  
...  
Keyword(s):  
Measurement Error ◽  
Temperature Measurement
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