IS 13621: Determination of dielectric constant of wood under microwave frequencies- Method of test

10 Pages·1993·1.1 MB·English

by  Bureau of Indian Standards

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IS 13621 (1993): Determination of dielectric constant of
wood under microwave frequencies- Method of test [CED 9:
Timber and Timber Stores]
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Indian Standard
DETERMINhTIONOFDIELECTRICCONSTANT
OFWOODUNDERMICROWAVE
FREQUENCIES- METHODOFTEST
UDC 674.03 : 6-333-713-126

@ SIB 1993
BUREAU OF INDIAN STANDARDS
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February 1993 Price Group 2

.-
rebmiT lanoitceS ,eettimmoC CED 9
FOREWORD
sihT naidnI dradnatS was detpoda yb eht uaeruB fo naidnI Standards, retfa eht tfard dezilanif
yb eht rebmiT lanoitceS eettimmoC had neeb devorppa yb eht liviC gnireenignE noisiviD
.licnuoC
cirtceleiD seitreporp fo dodw reffo a laitnetop dohtem rof gninimreted erutsiom tnetnoc and
ytisned yb evitcurtsed-non lacirtcele ,tnemerusaem sediseb gnieb an tnatropmi ngised rotcaf
erehw doow is ot eb desu ni a erutcurts detcejbus ot citengamortcele .dleif tI is osla tnacifingis
ni gnidnatsrednu retaw-doow noitcaretni and ralucelom erutcurts fo .doow
evaworciM sehcneb rednu ,S J, X bands fo seicneuqerf era yltnadnuba elbaliava and edivorp an
ysae and etarucca dohtem rof gninimreted cirtceleid tnatsnoc fo doow ni nosirapmoc ot rehto
sdohtem at rewol egnar fo .seicneuqerf
nI gniraperp this standard, elbaredisnoc assistance has neeb deredner yb tseroF hcraeseR
,etutitsnI arheD Dun.
nI gnitroper eht stluser fo a tset ro sisylana edam ni ecnadrocca htiw this standard, fi eht lanif
,eulav devresbo ro ,detaluclac is ot eb dednuor ,ffo ti shall eb enod ni ecnadrocca htiw
SI 2 : 1960 seluR‘ rof gnidnuor ffo laciremun seulav ( .‘)desiver
SI 13621 : 1993
Indian Standard
DETERMINATION OF DIELECTRIC CONSTANT
OF WOOD UNDER MICROWAVE
FREQUENCIES - METHOD OF TEST
1 EPOCS 4.2 ehT apparatus stsisnoc fo a evaworcim
hcneb no hcihw eht stnemurtsni nevig ni
sihT standard srevoc dohtem fo gninimeted
4.2.1 ot 4.2.9 shall eb .dettif
cirtceleid tnatsnoc fo doow rednu evaworcim
.seicneuqerf 4.2.1
Klystron Power Supply
2 SECNEREFER tI sezigrene eht nortsylK sebut at suoirav
egatlov rof gnitareneg .evaworcim
naidnI dradnatS SI 707 : 1976 yrassolG‘ fo smret
elbacilppa ot rebmit ygolonhcet and noitazilitu 4.2.2
Klystron Tube ( Reflex Type )
( is yrassecen tcnujda ot this
secondrevision )’
standard. tT is a elgnis ytivac evaworcim ebut that sekam
esu fo eht elpicnirp fo yticolev .noitaludom
3 YGOLONIMRET
4.2.3
Isolator
3.1 roF eht esoprup fo this standard, eht -ifed
snoitin nevig ni SI 707 : 1976 and eht gniwollof It is a owt trap lacorpicer-non evaworcim
shall .ylppa tnenopmoc desu ot etalosi rotallicso morf .daol
3.2 cirtceleiD tnatsnoC 4.2.4 Variable Attenuator ( Rotary Wave
Attenuator )
ehT oitar fo ecnaticapac fo a lairetam and eht
ecnaticapac fo ria is denifed as cirtceleid tI stsisnoc fo eerht snoitces fo ralucric evaw
tnatsnoc ro eht lacirtcele ytivittimrep fo eht ediug htiw a evitsiser .mlif
.lairetam
4.2.5
Cavity Frequency Meter
4 SUTARAPPA
tI stsisnoc fo a lacirdnilyc elbanut ytivac
4.1 ehT apparatus is nwohs yllacitamehcs ni detnuom htiw its sixa ralucidneprep ot eht

.giP 1. main evaw .ediug

‘WAVE RATIO
r
1
KLYSTRON _ ISOLATOR _ VARIABLE CAVITY WAVE SLOTTED 1 WAVE GUIDE 1
TUBE ATTENUATOR- FREQUENCY - GUIDE SPECIMEN
METER HOLDER
,
I
FIG. 1 SCHBMATICD IAGRAM OF THEE QUIPMENTR EQUIREDF OR DETERMINATIOONF
DIELECTRICC ONSTANTO F WOOD
1
IS 13621 : 1993
4.2.6 Wave Guides ycneuqerf gnignar morf 1 ,HG ot 15 .zHG
,revewoH 10 zHG is dednemmocer ( 1 zHG =
esehT era noissimsnart senil hcihw era desu ot
10Q .)s/elcyc
refsnart ygrene at evaworcim seicneuqerf morf
eno tniop ot .rehtona
6.3 Record of the Shift in Minimum Position
4.2.7 Due to Specimen
Slotted Section of Bench with Probe
yletaruccA denihcam noitces fo a evaw ediug ehT eborp shall eb tpek at a aminim noitisop
gnivah a lanidutignol tols ni eht ertnec fo eht and eht gnidaer no eht hcneb shall eb .nekat
daorb wall fo eht .ediug ehT nemiceps shall won eb decalp ni eht evaw
ediug ni tcatnoc htiw eht trohs tiucric etalp
4.2.8 and eht noitisop fo eht wen decalpsid aminim
Voltage Standing Wave Ratio ( VSWR )
shall eb .dedrocer ehT ecnereffid ni eht owt
Meter
snoitisop fo eht aminim shall eb eht tfihs ( n )
tI is a retem-tlov ot erusaem eht egatlov fo eht eud ot eht noitresni fo eht .nemiceps
amixam and aminim fo eht standing EM
.sevaw
6.4 Determination of Moisture Content of the
Specimen
42.9 Specimen Holder
ehT nemiceps shall eb dehgiew yletaidemmi
tI stsisnoc fo a noitces fo a evaw ediag ni hcihw
retfa gnidrocer eht .tfihs ehT nemiceps shall
an elbatsujda wol ,ssol gnitcatnoc ekohc epyt
neht eb tpek ni detalitnev nevo at 103 f 2°C
trohs is .dettif
llit ti attains a tnatsnoc mass and nevo
deird mass fo eht nemiceps shall eb .dedrocer
5 TEST SPECIMEN
ehT erutsiom tnetnoc fo eht nemiceps at eht
ehT nemiceps shall evah eht ssorc noitces os as emit fo tset shall eb detaluclac yb eht alumrof
ot tif ylthgit ni eht evaw ediug and htgnel lauqe nevig :woleb
ot eht retrauq evaw htgnel edisni eht rebmit
at gnitarepo .ycneuqerf ehT snemiceps shall ME!!? - ”w
ow x 001
eb eerf morf stcefed and shall eb denoitidnoc
ot a tnatsnoc mass at 5G + 5 tnecrep HR and
M = erutsioM ,tnetnoc ;tnecrep
27 f 2°C ni a elbatius gninoitidnoc rebmahc
erofeb .tset Mass fo eht nemiceps ni g at eht
W =
emit fo ;tset and
6 PROCEDURE
nevO yrd mass fo eht nemiceps ni g.
W, =
6.1 Measurement of Guide Wave Length
gnidnatS evaw nrettap shall eb dehsilbatse yb 6.5 Calculation
gnizigrene nortsylk rewop ylppus and nortsylk The cirtceleid tnatsnoc shall eb detaluclac
.ebut ehT eborp shall eb devom gnola eht
using eht gniwollof :ealumrof

htgnel fo eht hcneb os as ot etacol eht noitisop
VSWR fo eht owt .retem evisseccus oT evah aminim eht etarucca detacidni ,gnidaer ni eht K - -- _!!K_ * nat C A(752 A+t) g 1... . )1( .*
eht gain ni VSWR retem yam eb dezigrene yb 27rt
snaem fo eht elbairav .retaunetta ehT ecnatsid X _ tan X
--- . . . . . )2(
neewteb evisseccus aminim shall eb deton and X
deilpitlum yb owt ot evig eht ediug evaw
1 + 2)tlf(/2)Xa(
htgnel ( hg .) = . . ..a. )3(
I + ( 2al hg ”)
6.2 Measurement of Frequency
yB gnipeek eht seulav fo hg, t and A ni eht
roF tnemerusaem fo ycneuqerf fo eht signal, tsrif ,alumrof K shall eb .detaluclac X shall eb
eborp shall eb devom ot eht amixam egatlov detaluclac morf eht dnoces alumrof yb using
tniop and eht noitisop fo eht regnulp fo eht
ytivac ycneuqerf retem shall eb os detsujda as tan X .selbat ehT cirtceleid tnatsnoc shall
ot evresbo eht pid ni eht VSWR .retem ehT x
neht eb detaluclac yb eht driht .alumrof
gnidaer fo eht retemorcim fo eht ycneuqerf
retem shall eb .deton sihT gnidaer shall eb
erehw
detsujda hguorht eht noitarbilac trahc fo eht
ycneuqerf retem and eht ycneuqerf fo eht =K noitagaporp tnatsnoc rof eht wol ssol
signal shall eb .dedrocer ehT cirtceleid eud ot cirtceleid muidem ni eht evaw
tnatsnoc nac eb denimreted at yna evaworcim ,ediug
2
IS 13621 : 1993
hg = evaW htgnel fo eht signal ni eht ria 7 REPORT’
dellif evaw ,ediug
ehT tset troper shah edulcni eht :gniwollof
n = tfihS ni eht aminim noitisop eud ot )a
seicepS fo ,rebmit
,nemiceps
)b niarG noitcerid ni eht nemiceps htiw
X = etaidemretnI ,noitcnuf
tcepser ot eht noitcerid fo eht cirtcele
t = nemicepS ,htgnel dleif fo eht evaw ,noitagaporp
erutsioM ,tnetnoc
a = Width fo eht evaw ediug ( htdiw fo ’c
eht nemiceps ,) and )d gnitarepO ,ycneuqerf and
cirtceleiD cirtceleiD .tnatsnoc
E = COnStant C>
Standard Mark
ehT esu fo eht dradnatS Mark is denrevog yb eht snoisivorp fo eht Bureau ojlndim
Standards Act, 2986 and eht seluR and snoitalugeR edam .rednuereht ehT dradnatS Mark
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decudorp ot ylpmoc htiw eht stnemeriuqer fo that standard rednu a llew denifed metsys
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Revision of Indian Standards
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:ecnerefer
Dot : No CED 9 ( 4839 )
Amendments Issued Since Publication
dnemA No. Date of eussI txeT detceffA
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