A proposal for a multijunction thermal converter [AC-DC standard]

Author

Yonezaki, Genta ; Shida, Katsunori ; Yamazaki, Toru

Author_Institution

Electrotech. Lab., Ibaraki, Japan

Volume

38

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

338

Lastpage

341

Abstract

A multijunction thermal converter is proposed as an AC-DC transfer standard. It consists of a row of thermocouples composed of bismuth and antimony on a mica substrate and a twisted bifilar heater wire. The junctions of the thermocouples are alternately aligned in parallel lines on the substrate. The heater, made of a fine resistive wire, is placed on one line of the junctions to make the hot junctions of the thermocouples. A thick copper plate covered with a vinyl sheet is fixed on the other line of the junctions to make the cold junctions. The AC-DC transfer difference of the multijunction thermal converter was compared with that of a single-junction thermal converter. The measurements show that the AC-DC difference of the latter differs from that of the former by -3.3 p.p.m

Keywords

convertors; measurement standards; thermocouples; thermoelectric conversion; AC-DC transfer standard; cold junctions; hot junctions; mica substrate; multijunction thermal converter; parallel lines; thermocouples; twisted bifilar heater wire; Analog-digital conversion; Bismuth; Copper; Laboratories; Power measurement; Proposals; Substrates; Thin film devices; Voltage; Wire;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.192302

Filename

192302