Evaluating the Inhomogeneity of Thermocouples Using a Pressure-Controlled Water Heat Pipe

Tamba, J.; Yamazawa, K.; Masuyama, S.; Ogura, H.; Izuchi, M.

doi:10.1007/s10765-011-1084-x

Cited by 16 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite the studies in this field [40,42,[44][45][46][47] the problem has still not been solved yet. Thermoelectric inhomogeneity is considered to be the main source of TC error [30,43] The ways to increase the accuracy of temperature measurements by TCs with significant acquired during long-term operation thermoelectric inhomogeneity of legs were proposed in the paper [48].…”

Section: E3s Web Of Conferencesmentioning

confidence: 99%

Designing an accurate system for temperature measurements

Кочан

2017

E3S Web Conf.

View full text Add to dashboard Cite

Abstract. The method of compensation of changes in temperature field along the legs of inhomogeneous thermocouple, which measures a temperature of an object, is considered in this paper. This compensation is achieved by stabilization of the temperature field along the thermocouple. Such stabilization does not allow the error due to acquired thermoelectric inhomogeneity to manifest itself. There is also proposed the design of the furnace to stabilize temperature field along the legs of the thermocouple which measures the temperature of an object. This furnace is not integrated with the thermocouple mentioned above, therefore it is possible to replace this thermocouple with a new one when it get its legs considerably inhomogeneous.. There is designed the two loop measuring system with the ability of error correction which can use simultaneously a usual thermocouple as well as a thermocouple with controlled profile of temperature field. The latter can be used as a reference sensor for the former.

show abstract

Section: E3s Web Of Conferencesmentioning

confidence: 99%

Designing an accurate system for temperature measurements

Кочан

2017

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…As the largest contributor of thermocouple uncertainty, a number of studies have focused on the inhomogeneity of specific material wires 21–25 as well as methods for its evaluation. 21,26–28 New quantitative methods for determining the contribution of inhomogeneity of thermocouples have been studied over a wide range of thermal gradients likely to be experienced in use and shown to be an improvement upon traditional depth immersion tests at fixed points for elemental thermocouples. 29…”

Section: Temperature Measurement Reviewmentioning

confidence: 99%

Review of industrial temperature measurement technologies and research priorities for the thermal characterisation of the factories of the future

Ross-Pinnock

Maropoulos

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

As the largest source of dimensional measurement uncertainty, addressing the challenges of thermal variation is vital to ensure product and equipment integrity in the factories of the future. Whilst it is possible to closely control room temperature, this is often not practical or economical to realise in all cases where inspection is required. This paper reviews recent progress and trends in seven key commercially available industrial temperature measurement sensor technologies primarily in the range 0-50˚C for invasive, semi-invasive and non-invasive measurement. These sensors will ultimately be used to measure and model thermal variation in the assembly, test and integration (AIT) environment. The intended applications for these technologies are presented alongside some consideration of measurement uncertainty requirements with regard to the thermal expansion of common materials. Research priorities are identified and discussed for each of the technologies as well as temperature measurement at large. Future developments are briefly discussed to provide some insight into which direction the development and application of temperature measurement technologies are likely to head.

show abstract

“…Since the thermocouple relies heavily on material properties, it is vital that the wire exhibits the same thermoelectric characteristics along its length. A number of studies have focused on inhomogeneity and methods for its evaluation [9][10][11][12] while some have focused on specific inhomogeneities and drift when using particular wire materials [11,[13][14][15][16], which is encouraging for the development of thermocouple capability.…”

Section: Thermocouplesmentioning

confidence: 99%

Identification of Key Temperature Measurement Technologies for the Enhancement of Product and Equipment Integrity in the Light Controlled Factory

Ross-Pinnock

Maropoulos

2014

Procedia CIRP

View full text Add to dashboard Cite

Thermal effects in uncontrolled factory environments are often the largest source of uncertainty in large volume dimensional metrology. As the standard temperature for metrology of 20˚C cannot be achieved practically or economically in many manufacturing facilities, the characterisation and modelling of temperature offers a solution for improving the uncertainty of dimensional measurement and quantifying thermal variability in large assemblies.Technologies that currently exist for temperature measurement in the range of 0-50˚C have been presented alongside discussion of these temperature measurement technologies' usefulness for monitoring temperatures in a manufacturing context. Particular aspects of production where the technology could play a role are highlighted as well as practical considerations for deployment.Contact sensors such as platinum resistance thermometers can produce accuracy closest to the desired accuracy given the most challenging measurement conditions calculated to be ~0.02˚C. Non-contact solutions would be most practical in the light controlled factory (LCF) and semi-invasive appear least useful but all technologies can play some role during the initial development of thermal variability models. Main textIn large volume metrology, thermal effects make a significant contribution to the uncertainty of measurements. Large structures that are often 20 m in length or greater are currently being assembled in factory environments where there can be thermal gradients of around 3-5˚C from floor to ceiling at any given time. Over a 24 hour cycle, the variation in ambient temperature can be as much as 15˚C.Whilst dimensional measurements in industry are sometimes taken alongside ambient temperature measurements which are used for linear scaling within the metrology software, this is often a sole measurement at one point in space, at one instance.One potential solution to the problem of thermally induced uncertainty is to model the thermal characteristics of the measurand. This can be achieved by monitoring the temperature and using this data to update a computational model that can more accurately predict the thermal and gravitational effects of the environment. The computational model makes use of the nominal CAD geometry of the measurand, alongside finite element analysis and tolerancing software.

show abstract

Evaluating the Inhomogeneity of Thermocouples Using a Pressure-Controlled Water Heat Pipe

Cited by 16 publications

References 9 publications

Designing an accurate system for temperature measurements

Designing an accurate system for temperature measurements

Review of industrial temperature measurement technologies and research priorities for the thermal characterisation of the factories of the future

Identification of Key Temperature Measurement Technologies for the Enhancement of Product and Equipment Integrity in the Light Controlled Factory

Contact Info

Product

Resources

About