LV13552B - Method for determination of moisture content - Google Patents

Abstract

The present invention pertains to field of electric capacitance methods of nondestructive testing, and it can be used for quantitative evaluation of moisture content in inhomogeneous and structurally instable products from polymer porous materials. The objective of the invention is to increase the accuracy in testing of structurally instable polymer porous materials. The proposed method lies in measuring of electric capacitance C of testing material under the two frequencies f1 and f2 of external electric field and in determination of moisture content by the ratio of measured values of capacitances (C1 and C2), using calibration curves of material C ~ f. The operating frequencies are selected over the range from 20 Hz to 20 kHz, but their ratio is set to value over the range 300 - 400. A block diagram of device for determination of moisture content of material is presented in Fig.1 The device representing an example of device for implementation of the method consists of voltage generators (1) and (2) producing sinusoidal measuring signals hold on the frequencies f1 and f2 (f1 is not equal to f2), summer (3), instrument capacitor (4) with testing material (5) placed between the capacitor's plates, filters (6 and 7), measuring channels (8 and 9), computing device (10) and output indicator (11) of moisture content of material.

Description

LV 13552

CIIOCOE OIIPE ^ EJIEHHfl BJIA3CH0CTH MATERIALS BOOKMeMe H3o6pereHne OTHoenrea k aneKTpoeMKocTHtiM MeTonaM Hepa3pyinaMom Compass h MoaceT 6tm > Hcnom > 30BaHO nna KOJinHecTBeHHon onemcn conepacanna Bnarn b ΗβοηΗοροηΗΜΧ h HecTa6nnBHbix from CTpyicrype H3neJinax H3 nonHMepHBix πορηοτΒΐχ MaTepnanoB.

EbBecTeH aneKTpoeMKOCTHon of1HOHacTOTHHH cnoco6 is a dentifrice BJiaaaocTH MaTepnanoB [1], ocHOBaHHBifi If npajcraraecKOM Hcnojn > IIpH npOBe ^ ehhh Bnaron3MepeHnn of H3BecxHOMy cnoco6y κοΗτροπηργβΜΗΗ MaTepnan pa3MemaioT Meacny o6Kjia ^ Kamhi (aneicrpo / iaMH) H3MepHTem > Horo KOHneHcaTopa, HaBonaT b Me "3JieKTpojiHOM npocTpaHCTBe nepeMeHHoe CHHyconnajn > Hoe ajieiopHHecKoe none c 3apaHee 3anaHm > uM ποοτοληηβιμ 3HaneHneM nacTora / n of H3MeHeHHio H3MepeHHoro 3HaqeHHa eMCocra C ayEyEyeNeNeNeNeN Bnaamocm MaTepnana. 3jieKipnqecKyio eMKOCTB C o6pa3na H3 K0HTpojrapyeMoro MaTepnana npn 3tom onpenenai οληημ H3 o6inen3BecTHi.ix ΜβτοηοΒ - pe30HaHCHHM, moctobbim, aMnepMeTpa-BOjn > TMeTpa np. [2], / LOOCTOHHCTBOM OflHOHaCTOTHOTO βΜΚΟΟΤΗΟΓΟ CHOCo6a BnaT0H3MepeHHH BBnāeTCa Difference BHCOKaa προΗ3Βοηητεηί > Ηθθτι > (3Kcnpecc-KOHTpojn > conepacaHHa Bnara). CymecTBeHHbiM ace HenocTaiKOM cnoco6a aBJiaeTca cpaBHHTentHO HH3What is the BJiaroH3MepeHHH, κοτοργιο oh MoaceT o6ecneHHTt. B oco6eHHOcra 3to npoaBJiaeTca npn Composed by BJiancHOCTH Heo / HoponHtDC h HecTa6njn.Htix from CTpyiaype nonHMepm.ix nopHCTBix MaTepnanoB. Kax noKajtiBaiOT ηοπβπβηηβ, Takor Pona Maiepnanbi nornomaiOT Bnary Bec & Ma HepaBHOMepHo of o6i > EMY, ητο πρηΒοηκτ κ cymecTBeHHOMy pa36pocy H3MepeHHBix 3HaHeHHH ajieKTpnnecKOH eMKocra, cooxBeTCTByiomHx oaHOMy n Tomy ace BJiaroconepacamiio. Hhbimh cnoeaMH, HecTa6nm.HOcrn > BHyTpeHHen òτργκτγρ & ι nopncToro MaTepnana οτ naprnn κ napran nrpaeT dot CBoeo6pa3Horo Meinaroinero φaκτopa, npHBonamero κ yBenHHeHmo norpenmocm Kompona (norpemHoen. KOJiH ^ ecTBeHHoro Compon BJiaroconepacaHna npeBtimaeT 30%). YCTpaHHTt Memaiomee BjiHflHne HeonHoponHOCTH οτργκτγρκ MaTepnana Ha tohhoctī. BjiaroH3MepeHHn πο3βοπηκ > τ MHoronacTOTHBie aneicrpoeMKOCTHtie MeronM, ocHOBaHHbie Ha H3MepeHHH aneieipnnecKOH eMKocra κοΗτροηκργεΜοτο BnaacHoro MaTepnana Ha pa3JiHHHbix aacTOTax n conocTaBneHHH pe3ym > TaTOB 3thx H3MepeHHn. Han6om > mee pacnpocTpaHeHne nonynnn nByxHacToinbiH aneiapoeMKOCTHOH cnoco6, πρΗ κοτοροΜ nncneHHbie 3HaHeHHH Nacra BHenraero aneinpHHecKoro nona BbiOnpaiOT b ym > Tpa3ByKOBOM, a (Hana30He cneiapa (οτ 0.1 100 MTN) H3Mep "OT aneKTpnaecKHe eMKocra MaTepnana npn neyx B & i6paHHtix 3HaaeHnax NACTIS n no cooTHomeHHio H3MepeHHtix 3HaHeHHH eMKoeren is a phenomenon BJiaacHOCTH. MaTepnana [3] (BtiOpaH b KaneciBe npoTorana).

Cnoco6-npOTOTrai 3KcnepnMeHTam > H0 oipaOoTaH n npenHa3HaneH nna onpeneneHna Bnaamocra MaTepnanoB Zipporah orpaHHHeHHon HOMeHKnaTypw (3epHO, Han, Ηεφτι., NiepCTt, OvMaacHoe nonorao η n), P "κοτορΒίχ onTHManbHHe paOoane 3HaqeHna aacTOT Haxon" TCA b ym »Tpa3ByKOBon Nacra cneKrpa (οτ 0.1 to 100 MTn). rionbīTKa ace npnMeHeHna peKOMeHnaunn cnocoSa-npoTomna npn nByxnacTOTHOM KOHipone BJiaacHociH nonnMepHoro nopncToro MaTepnana He naeT oacnnaeMoro 3φφβκιη, whereby to o6ycnoBneHO npaKranecKon HHBapnaHTHOCTbio (b yntipa3ByKOBOM nacTOTHOM nnana30He npn / > 0.05 MTP) aneiapHHecKOH cmkocth τβκοτο MaTepnana κ H3MeHeHHio nacTOTH f οηεκτρηηεκοΓΟ nona H3MepnTem.Horo COFFEE Hcaropa. Ηηβιμη cnoBāMH 1 cooTHomeHHe H3MepeHHtix 3HaHeHHfi εΜκοετεδ b yjiBTpa3ByK0B0M flHana30He cneierpa OKa3BIBaeTCa MajI0tiyBCTBHT8HBHBIM K H3M8HeHHIO BJiaaOHOCTH (NPH JH060H BJia > KHOCTH OHO 6jth3ko ke ^ hhhi), whereby to CBH / ieTejiBCTByeT o hh3koh tohhocth cnoco6a-npoTOTnna NPH κοΗτροπε HecTa6Hjn > m.ix of CTpyKType ποηΗΜερΗΒΐχ nopHCTBix MaTepnajiOB. yKa3aHHBiH HeflociaTOK cnocoGa-npoToruna aBjiaeTca cymecTBchhbim, ποεκοπΒκγ o6jiacTi. npaKranecKoro HcnojiB30BaHHa nojiHMepm, ix πορκοτΗχ MaTepnaJioB b nocjieAHne γολβι ΗεγκηοΗΗο pacinupaeTca. B nacTHOCTH, MaTepnanti yica3aHHoro Tim, 6jiaronapn CBOE OTHOCHTejiBHofi JiencocTH h hh3koh τεπηοπροΒοηΗοετκ, BCE ιιπφε Hcnojn.3yeTca b Kanecnee Tenno3ainHTHOH h3ojihi1hh (T3H) jieTaTejn > HBix annapaTOB (BnaacHocTi) T3H χΒηηεταΐ οληημ h ee HaH6ojiee BaxcHBix 3KcnjiyaTaniīOHHBix noKa3aTejiež). IļejiBH) npejuiaraeMoro Η3θ6ρβτεΗΗΧ XBJiaeTca noBBiineHHehehhhthth BJiaroH3MepeHHH προ KOH KOHTTToj HecTa6HJiBHi > ix from CTpyKType nojiHMepH & ix πορποτΒΐχ MaiepnajiOB. IIocTaBneHHaa nejn. AOCTHraeTca τεΜ, ητο Η3Μερχκ > τ οπεκτριπεεκγιο cmkoctb KOHTpojmpyeMoro MaTepnajia πρκ nsyx 3HaneHnax nacTOTti BHeniHero ajieKipmecKoro glade h ^ onpe ejmioT BjiajKHocTb MaTepnana of cooTHomeHHio Η3ΜερεΗΗΒΐχ 3HaneHHH εΜκοοτεΗ. N6AntiCtHi H3MepemiSyj nf2 npn stom BBiOiPaiT b nHAN30He ot 20 Γη no 20 κΓη (οτηΗΗΗτεηΒΗΒπί npH3Hax), a hx cooTHomeHHe f2 / f ycTaHaBjiHBaiOT b npenenax ot 300 no 400 (οτιπΐΗΗτεηΒΗΒΐΗ πρΗ3Ηηκ). hnmocTpanHH saphta τεχΗηηεοκοΗ peanH3anHH npennaraeMoro cnocoOa npencTaBJieHH cnenyiontHe ι ^ φΗΗεεκκε MaTepnanti. If φητ. 1 H3o6paxceHa cipyiaypHan in Scheme ycTpoScīBa nna onpenenemui BnaacHOCiH Maiepnana (EXAMPLE peajiH3anHH cnoco6a) Ha φκΓ.2 - ΓρΒφκκ 33βηοημοοίη aneiapmecKOH eMKoera C H3 o6pa3na τηποβογο nojniMepHoro nopHCToro MaxepHana ot nacTOTBi f ηπεκτρΗτεοκοτο nona H3MepHTem.Horo KOHneHcaTopa Ha φκτ. 3 h 4 - τρ3φκκΗ 3aBHcHMOCTež KOjnreecTBa BJiarH m, conepiKaineftca b o6pa3H8 H3 KOHipojmpy8Moro ποηΗΜερΗΟΓΟ πορκετοτο MaTepnana ot ero οπεκτρΗπεεκοΗ εΜκοετκ C (nna pa3jniHHtix 3Η3ηεΗΗΗ nacroiBi f 3jieiopHHecKoro nona) Ha φκτ. 5, 6 h 7 - τρ3φκκΗ 3aBHcnM0CTCH KomraecTBa Bjiara m, conepacainenca b o6pa3ne H3 κoHτponHpyεMOΓo MaTepnana, and cooTHomeHHa C

IlpenJiaraeM & hcnocoO6HapyxceH h cφopMyJIHpoBaH noBeTaM 3KcnepHMeHTJn & HBt nccjiaoBarom Ha ycTpo0CTBO, CTpyKiypHaa cxoMa κοτοροτο npencTaBneHa Ha φκτ. 1 ΥετροΗοίΒΟ οοηερχαίτ nsa roHopaīopa 1 h 2 CHHycoHnantHoro HanpaaceHHa, BLipaSaTtreaioiinDi H3MepHTejiBHBie cnrHajīBi Ha nacTOTax FHF {f \ Φ fi) cyMMaxop 3 Η3ΜερΗτεηΒΗΒΐΗ KOHneHcaTop 4 c paBMeinoHHtiM Me * ny ero o6icianKaMH KOHTponHpyeMHM MaTopnanoM 5 φκηΒτρΒΐ 6 h 7 nea Η3ΜερΗτεπι, ΗΒΐχ KaHajia 8 h 9, BBiHHcnHTejibHoe ycTpoMcTBo 10 η ΒΒΐχοηΗΟΗ HHnHKaTOp 11 BJiaacHocTH MaTepHana. Γ8HepaTOpBI 1 H 2 BBIaObTBIBai CHHyCOHnaJIBHBie 3JI0KTPHH0CKH0 CHTHaIBIB c pasjnīHHBiMH (ho 3paHoo 3anaHHBiMH) nacTOTaMH f Yi.fi. Ha cyMMarope 3 jrcajaHHBie canianLi cicnan i > Ibak) TCA, Nocni nero nojiyneHHBiH po3yjiBTHpyiOHīHH CHrHan, npoxona nep83 Η3ΜερΗτειπ > ΗΒΐΗ KOHneHcaTop 4 c KOHTponHpyeMBiM MaTepnanoM 5 nonaeTca Ha φπηΒτρΒΐ 6 h 7 ΦϋηΒτρ 6 BBinena8T H3 p83yjiBTnpyioinero cHrHaaa cocTaBJiaiouīyio c nacTOTOH f, a φκιΐΒτρ 7 - cocTaBjiaioni: yio c aacTOTOž fi. B εοοτΒβτετΒΗΗ c 3thm Η3ΜερΗτεηΒΗΒΐΗ Kaha 8 ρετΗετρκργετ 3ηεκτρΗτεεκγκ) 8mkoctb C \ κοΗτροηκργεΜΟΓΟ o6pa3na Ha aacTOTe / i, a h3M8pht8jibhbih Kahan 9 - 3ΒεκτρΗΗεεκγκ) 6Mkoctl C2 toto xce oOpajpa Ha HacTOTe f2. ΟτΜετΗΜ, ητο Η3ΜερΗτεηΒΗΒΐε KaHanBi Moryr 6βιτβ ποετροεκΒΐ 2 EN 13552 Π0 pa3JIHHBB Η3ΒβΟΤΗΒΙΜ ΠρΗΗΧΠΊΠΒΜ (pe30HaHCH0My, MOCTOBOMy, Η3ΜβρβΗΗΛ TOKOB H Hanpfl * eHHH Η, Ζφ.) [2],

CllTHajIBI U \ H H BBĪXO U2, Hax H3MepHTeJIBHBIX KaHaJīOB 8 H 9 npOnopiīHOHajIbHBie eMKocTKM C \ h Ci npeo6pa3yioTCā c πομοπιβιο ββπηοπητ6.ιιβηογο ycTpo0CTBa 10 κ CHTHajiy BHjļa U \ IUI, nponopiiHOHajn > Homy oraorneHino eMKOCTeii CJCi. Orο Beyorame cnmajia Ul / Uj (hjih coarHomemni C iC2) is the subspecies of BJiaaKHOCTB MaTepnajia, npmeM OTcneT noKa3aHHfi ocymecTBJiaeica from npepBapHTJIHO 0TrpaayHp0BaHH0My b e, nHHHnax

BjiaacHOCTH HHjiHKaTopy 11.

OnTHMajiLH & IE 3HaqeHHs paSonroc nacTOT ^ l vjfi, οβecnenneaiomne HanBi icmyio tohhoctb BjiaroH3MepeHyri, onpenejieim b xoae callsHMeHTJiBHOH OTpaSoTKH npone, aypBi npeanaraeMoro cnocoSa. B Ka ^ ecrBe oOneKTa ye ndn 3tom ncnojiB30Bajica Ha6op ορηοτηπηβιχ o6pa3poB (pa3MepaMH 200 x 200 x 14 mm), H3rotobJieHHbix H3 MaTepHaoa Teruio3aiHHTHOH h3oji3hhh (T3H) iteTaTejiBHoro give it. MaTepnaji T3H othochtcx k rnny nojiHMepHtix nopHCTBK, jum κοτορΒίχ xapafcrepHa BBicoKaa cTENHB HeoflHOponHOCTH BHyrpeHHefi CTpyioypBi.

If φκτ. 2 npeacTaBjieHBi nojryHeHHBie 3KcnepHMeHTajiBHO ΓρΒφΗΚΗ 3aBHCHMOcrefi ycpeflHeHHoro (from pe3yjn > tatami aecara ηοπβγπιηηη) 3HaneHHx θμκοοτη Cm o6pa3na T3H ot ^ f acTOTBi 3JieiapHHecKoro nojia H3MepHT6JiBHoro KOHaeHcaTopa (npn pa3JnrqHOM coaepacaHHH Bjiara m o6pa3ne b). AHaoro πρΗΒβηβΗΗΒΐχ Γρ3φηκοΒ noica3BiBaeT, ητο c ροοτοΜ nacTOT f 3jieiopHqecKaa eMKOCTB Cm KompojiHpyeMoro Marepnana mohotohho yMeHBmaeTcx. ΠριηιβΜ, HanGojibinHS ΗΗκρβΜβΗΤ (ckopoctb) yMeHB measure eMKOcrn HaSjnoAaeTca b 3ByxoBOM pineappleHe cneicipa (/ = 20 Γη - 20 κΓη) n cocraBJineT b cpeOTeM 3,1-1 θ'4 πΦ / Γρ (πρκ BJiarocopep ^ caHHH m = 0,5 r ) h 31,5-10 ^ πΦ / Γη (πρκ BjiarocoaepacaHHH m = 10 r). 3a npepenaMH 3ByKOBoro anana30Ha cneiopa BejiHHHHa cmkocth Cm paccMaīpHBaeMoro Maiepnajia οτβηοβητοχ npaicraHecKH HHBapHaHraofi κ H3MeHeHHK) naCTOTBI f, HTO SKBHBaJieHTHO 6jIH3KOH K HyjHO HyBCTBHTejIBHOCTH KOHTpOJM BJiaacHocTH of m ^ opMaTHBHOMy napaMexpy C \ IC2. Taion o6pa30M, AByxtiacxoTHBifi BapnaHT is the main source of BJiaacHOCTH MaTepnaj, HcnojiB3yioimiS b Kaneciee m ^ opMaHBHOHaMeTpaCoHomeHHe C C2, npaKronecKM mainH3yeM eggbko b cjiynae BBi6p6 nONepenx pnana30Ha? B stom npHHPHnHaJIBHOe OTJIHHHe nOJIHMepH & Di ΠΟρΚΟΤΒΙΧ MaTepnaJIOB OT 6ojIBUIHHCTBa apyΓΗΧ HeMeTajnmneciaEi MaTepnajioB, pjih κοτορΒίχ onTHMajīBH & IMH xbjwiotcb paOonne nacTOTBi b npenejiax yjn.ipa3ByK0B0H Nacra cneiopa (0.1 to 100 MFN) [3]

If φκτ. 3 h 4 npepcTaBJieHBi rpapynpOBOnHBie KpHBBie jum onHonacToraoro aneKipoeMKOcraoro Meīopa BJiaroH3MepemīH [1] ycTaHaBJiHBaioinero B3aHMOCBX3B Mexcpy KOJinnecTBOM BJiara m, conepacainenca b MaTepnane T3H h 3jieKrpHHecKOH eMKOCTBio C o6pa3pa (jum ķbyx pasjītmHBK 3HaneHHH nacTOTBi f ajieiopKnecKoro πoim H3MepHTejiBHoro KOHpeHcaTOpa). CnnonmoH jraHHefi Ha ΓpaφHκax o6o3HaHeHa ycpepHeHHaa rpaayHpoBonHax KpHBaa, nocTpoeHHaa of pe3yjitTaTaM ycpepHeHHX 3aMepoB H 10 o6pa3pax, a nyHKrapoM - rparamBi nona pa36poca H3MepeHHBix 3HaHeHHH eMKocra C (nojie pa36poca 3amTpHXOBaHo). Kax cjiepyeT H3 npHBepeHHBK ΓρηφΗΗεοκΗΧ MaTepHanoB, OTHOcHTejiBHaa norpeniHOCTB BJiaroH3MepeHHfi γ πρκ oaHonacTOTHOM sjieiapoeMKOCTHOM KOHTpone HeponycTHMO Bejimca: γ = 60 - 100% πρκ Bjiarocopepx < ahhh m = 0.5 to 5 r η γ = 30-50% NPH BJiarocopepxiaHHH m = 5-10 r. TaKaa HH3Kax tohhoctb H3MepeHHH He yaoBJieTBopae ποτρβδΗοοτΒΜ npaKTHKH, hto 3 «BjiaeTca apryMeHTOM b nojib3y nepexo, aa κ npeAJiaraeMOMy flByxHacTOTHOMy cnoco6y BJiaroH3MepeHHH.

Ha φΗΓ. 5, 6 h 7 npeacTaBJieHH rpaityHpoBOHHMe KpHBbie pjvt BByxHacTOTHoro cnocoGa BJiaroH3MepeHHH, OTpaacaioimīe B3aHM0CBB3b KojnraecTBa Bjiara m, co ^ epacameMca b Maiepnane T3H, c cooTHoraeHHeM eMKOCTeft C \ LCI o6pa3noB, H3MepeHHBix Ha pa3jnrqffl.ix HacTOTaxf h f2 (b npeAejiax flHanasoHa οτ 20 of Γη 20 κΓη). CEC η paHee, οπηοιπημμη λκηηβμη Ha Γρβφκκβχ o6o3HaHeHw ycpe, zmeHHbie rpajjyHpOBOHHBie KpHBbie, nocTpoeHHbie of pe3yju > tatami ycpeflHemis 3aMepoB Ha aecara o6pa3nax, a njnncmpoM - rparombi nona pa36poca H3Mepemn > ix 3HaneHHH napaMerpa C \ IC% (Camo nojie pa36poca 3aiiiTpHXOBaHo).

ConocTaBHTejiBHMH aHajiH3 nojiyHeHHs ix ΓρΒφΗΗεοκΗΧ NiaTepnanoB noKaTiBaT, hto nocpejicTBOM nepexo.na ot ojiHOHacTOTHoro drives, MKoeiHoro Computers κ flByxHacTOiHOMy μοχοηο cymecTBeHHo yMeHwnHTi > norpenmocTb BjiaroH3MepeHHH. ΠρΗ 3tom HanGojiee omyxnMoe cHHacemie norpeinHOCTH γ HaGjnojiaeTca πρκ ίβκομ BbiGope HHCJieHHBK 3HaHeHHH HacTOT f \ isf2 (b iīpeflejiax flHana30Ha ot 20 Γη ro 20 κΓη) hto6h hx cooTHomeHHe 6tuio paBHtiM fjf = 300 - 400 HanaeHHOMy onxHMajibHOMy cooTHomeHHio nacTor ^ //! cooTBeTcrayeT φκτ. 5, nocrpoeHHaa npaf = 50 Γη h f2 = 18 κΓη (fl / f = 360). norpHHOCTB BJiaroH3MepeHHH b 3tom cjiynae cocraBJiaeT γ = = 12 - 15% npn BJiaroco-epacaHHH 7W = 0.5-5rHy = 8-12% πρκ BJiarocoaepacaHHH m = 5 -10 r, hto Bnojme yjīOBJieTBopaeT ποτρεδΗοοτχΜ npaKTHKH. Πρκ HeonTHMajīBHOM BbiGope pa6oHHx nacTOT f h f2 (Kora hx cooTHomeHHe He ynoBJieTBopaeT ycjiOBmo fjf = 300 - 400) norpemHOCTb κοΗτροπ »pe3KO B03pacTaeT. 3to Brushes ^ HO HJirnocTpHpyeTca h noflTBepacaaeTca ιρΒφιηεοκΗΜΗ MarepHajiaMH, npHBeiceHHBiMH Ha φκΓ.6 (/ 1 = 20 Γη, f2 = 2000 Tix, f2 (f = 100) η φκτ. 7 f2lf = 500) B nepBOM cjn iaia (πρκ fjf = 100) norpemHOCTb BJiar0H3McpeHHH B03pacTaeT ηο γ = 45 - 50%, bo btopom CHynae (npaf / f = 500) - ro y = 35 - 40% norpemnocra HaGjnonajioch η πρκ apyrHX 3HaHeHHax HacTOT_ / l is.fi, not yflOBJieTBopHionņix ycnowaofjf = 300-400.

TaKHM 06pa30M, pe3yjIiTaTBI ΒΒΙΠΟΠΗβΗΗΒΙΧ 3KCnepHMeHTaJH > HBIX HCCJieAOBaHHH noKa3biBaiOT, whereby to rjīsi noBtnneHHa tohhocth flByxHacTOTHoro cnocoGa onpenejiemiH coaepacaHHH BJiara b nomīMepm > ix πορηοπ.ιχ MarepHanax paGonne nacTOTti κοΗτροΜ, / Ι h fi cjieayeT BBi6npaTi > b npe, aeJiax 3ByxoBoro HHana30Ha cneicrpa (/ = 20 Γη - 20 κΓη), ycTaHOBHB npn stom hx cooTHomeHHe paBHHM f2 / f = 300 - 400. KoHTpojrapyeMi > iH MaTepnaa 5 (cm. Φκτ. 1) pa3MemaiOT Meacay o6icaaAKaMH H3Mepirrejii, Horo KOH ^ eHcaTopa 4 ^ acTOTti f \ isf2 CHHyconnajitHMx 3JieicīpnqecKHX cnrHajiOB, BBipa6aTE > iBaeMbix reHepaTOpaMH 1 n 2 Bw6HpaioT b npeaejiax 3ByKOBoro flnana30Ha cneicrpa β οοοτβογογβηη c ycnoBHeM f2 / f = 300 - 400 H3MepHTejiBHBiM KHHajiOM 8 perHCTpHpyioT ajieicipHHecKHH cnraaji U \, nponopiiHOHajībHMH eMKOCTH C \ o6pa3na Ha nacTOTe / J, a Η3ΜβρΗτεπΒΗΒΐΜ κβηββομ 9 -3JieKTpnHeCKHfi cHTHaji U2, nponopiļHOHajīBHtiH eMKOCiH C2 Ha nacTOTe f2. Πο COOTHOineHHK) CHTHaiIOB UJU2, cφopMHpOBaHHOMy C ΠΟΜΟΙΗΒΙΟ BblHHCJniTeJIBHOrO ycipoHCTBa 10, onpOrT BJiaacHocrb KOHTpojrapyeMoro Marepnajia, Hcnonb3yB npe «BapHTejibHO OTrpaflyHpoBaHHbiS b e ^ HHini; ax BjiaacHocra rrammcaTop 11. 4

Claims (1)

The method for determining the moisture content of materials, based on measuring the electrical capacity of a controlled material at two frequency values of the external electric field and determining the moisture content by the ratio of measured capacities, differs in that ₂ selects between 20 Hz and 20 Hz