SCIENTIFIC - PYROMETRY

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600231042-9
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: July 18, 2011
• Sequence Number: 1042
• Publication Date: July 5, 1949
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600231042-9
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;OURCE
P. A. Shohukia
L. 0. Rgashina
Institute of Idetellurgy
Acaden~ of tioieaoee U8~
tuagstsa+graphite thermocouple to find vids'appl.iaa+.da~! madsr pro~.uctSoe.
nad lsboratory ooriditilme. One should point out the ezisting design ox
tungsten-graphite thermocouple suggested by oollaborators of Abrdemioiaa
!1. A. Pavlov, and suooasefully weed by them for abort-tine dsterain-.tiane
of temperature in the mining blast furnaces of the 1legnitogorak sad
7rporoahr p~laute. (I. Z. Eoalovioh, 8ovstak a m Po 9, 1936).
For t'.area aveaiiremsnt~, the thermocouple h n4 pro otive ones and vas
for which reason it is nscessnrr to parteot it with ea sspsoi~ impsn-
etrabls mounting affi piaoe it la a neutral medium. This oirotmtstaaos
is evidently the min cause of its limited use.
At the eeues time it ie possible, given good dsri~a, fcr the'
Ia _,iaay inatnaaes, it !e convenient to ues n tungsten-g~phits
thsrmooourple for measuring high temperaturoe. With n tungsten-grnpUite
thermocouple, the temperature oea ba vs:Pisd up to 2,000 degrees. It ie
eoapnsstively ohenp emd gives sufficiently eocurnts readings. Its main
iaeon. A brief dsecrip#ioa of a ner design of tungsten-grapbits thstio-
ooupls la giPea trknr.
periphery to the z'S:: of the blast furnace.
Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600231042-9
 Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600231042-9
The ther:~cccuplo ccncaiata oY- a hollow graphite rad, - A tw's~aten wire
spiral i? located 5 mill#metrtre from the erd of this rod. To avoid
oxidation of the tuagaten, the spiral is sealed with a hS,gh-mhlting
material, consisting of finely ground magnesite ;Wised with x+ei~actory
e.tay in the ratio of 4 to 1. The spiral is in c].oee cantact with the
graphite rod, A protective tuba is inserted in the rod, and the Pros
end of the tungsten wire is led out through it.
This combinatidn of working parts permits thez7aocouples beiaag
merle from very thin graphite tubes and various thicknessees of tungsten
wire. Moreover, it very much simplifies mounting and the avoidance cf
damage. Xn view of the coneidarable .~ritt3.enesa of graphite we rocommend
oaYier9ng thin tubes from the appropriate factories, or making theffi fi~am
electrodes with a central core. The core is aisle of a material soften
than graphite, and so a hole up to k00 millimeters long can easily be
made by baud with a twist or pointed drill. W1aea the opening has bean
made, the gxgphits tube is machined on an ordinary lathe. ~'or this
purpose it is held in the lathe with a comproasible bmnze chuck eleevti
and brought to the required diameter by plain turning. To avoid fxecturee,
the tube should be machined in separate etsges 23 - 30 mi].limetere long.
66th an initial th~`ek,~esa of 10 - 12 millimeters, the cut ehoull twt
exceed 0.3 mi111metera. Experience has shown that a graphite tube with
an external diameter of 8 m;.111.metere axm a 2- to ~-mil].imater diameter
hole can easily be manufactured by this method.
Aftex calibraticaa, the tungaten~graphite thermocouple xae ?teeted by
using it to measure temperature in a layer of hot coke eub~ected to
forced draught.
To :.void oxidation of the tungsten and eafeguaxd the thermocouple
from mechanical damage due to the coke, it was paroteotsd by quartz
casings Q millimeters iL internal diameter and 2 millimeters thick. The
gape be~hroen the casing sad the graphite tube, and between the insert
sad the tungsten wiro were filled up with piaeteline. Daring the
ezpertmenta in burning solid fuel in an enlbrged laboratory iasta~lntioa,
the temperature ras measurod with five Lu::gstea-grngaite thermocouples
simultaneously.
Sumeroue esperimente shored that a thermoco~rcle of this deaiga cea
withata~ tarmperature of 1,200 - 1,700 degrees for mangy hours withou+.
damage. tie did not observe a single case of dsaege to the thermocouple
which was not preceded b7 fail.us~s of the quarti casing.+ Oa this basis,
tre con~.idsr that, given casings end inserts which are gee tight and have
s higher meltinFg point thsa quartz, and a loos f~ualble materiel for sealing
the contact spiral, the proposed design of thermocouple will be able to
make prolonged temperature measurements up to 2,000 de~gresr.
We therefore recomme~ that teats of our design oi' tungsten-graphite.
thermocouple ehoull be performed under other laboratory coalitions for
measuring high twmperaturos.
Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600231042-9