{"title":"Ball and cylinder interferometer","authors":"J. B. Saunders","doi":"10.6028/JRES.076C.002","DOIUrl":"https://doi.org/10.6028/JRES.076C.002","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1972-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116338735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thermal voltage converters and comparator for very accurate ac voltage measurements","authors":"E. S. Williams","doi":"10.6028/jres.075c.015","DOIUrl":"https://doi.org/10.6028/jres.075c.015","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131177616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S liding short me thods re prese nt a measure ment tool of substantial potenti a l fo r the meas ure me nt of s ma il losses s uc h as are assoc iated with wavegu ide connec tors or adaptors. Until rece ntly , howeve r, the use of these me thods has bee n inhibi ted by the unce rtainty of the e rror co ntribution due to non· idea l short be havior. A recent analys is by Alm assy has s hown that by the use of prope r techniques, the e rror contribu· ti on from thi s source is us ually negli gib le, provided tha t th e adaptor (or connec tor) is "we ll matched." It is the purpose of thi s paper to elimina te thi s latt e r res tri ction , de ve lop addition al meas ure ment me thods, and d esc ribe furthe r app lications.
{"title":"An extension to the sliding short method of connector and adaptor evaluation","authors":"G. Engen","doi":"10.6028/JRES.075C.018","DOIUrl":"https://doi.org/10.6028/JRES.075C.018","url":null,"abstract":"S liding short me thods re prese nt a measure ment tool of substantial potenti a l fo r the meas ure me nt of s ma il losses s uc h as are assoc iated with wavegu ide connec tors or adaptors. Until rece ntly , howeve r, the use of these me thods has bee n inhibi ted by the unce rtainty of the e rror co ntribution due to non· idea l short be havior. A recent analys is by Alm assy has s hown that by the use of prope r techniques, the e rror contribu· ti on from thi s source is us ually negli gib le, provided tha t th e adaptor (or connec tor) is \"we ll matched.\" It is the purpose of thi s paper to elimina te thi s latt e r res tri ction , de ve lop addition al meas ure ment me thods, and d esc ribe furthe r app lications.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"11 31","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113973647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A Burn e tt a ppa ratu s has been deve lu pe d for th e de te rmina ti un uf th e cumpress ibilit y fac tu r uf gases, includin g corrus ive ha loge ni c gases, to a n accurac y of 0.1 pe rce nt to 0.01 pe rcent at te mpera tures fro m 0 to 225 °C and for pressures up to 250 ba rs. T he a ppa l'a tus has bee n used throughout thi s te mpe ra ture and press ure range and a t te mpe ratures within 15 °C of the c riti ca l te mpe ra ture of the sa mpl e gas. T he a ppa ra tu s fea lures a rugged ye t highl y sens iti ve and re prod ucibl e null-Iype press ure transdu ce r to isula te the sa mple gas witho ut inlrud uc in g a pressure uncert a int y grea te r tha n th e prec ision of the press ure measureme nts, whic h is be tt e r th an 1 pa rt in 50 ,000. The press ure measure ment s a re acc ura te to at leas t I pa rt in 20 ,000. Th e reduction of the da ta is di scussed ex tens ive ly. Th e ca pa bility of th e a ppa ra tu s ha s been evalua ted in te rm s of the compress ibilit y fac tor represented by a finit e pressure or densit y vi rial expans ion a nd de rived from a rgo n da ta a t 25 °C a nd press ures up to 250 ba rs and in te r ms of the secund vi ri a l cue ffi cie nt of ca rbon diox ide based on data at 50 °C a nd pressures be low 35 ba rs. Th e va lu e ubt ain ed fur thi s secund viria l c~e fli c i e nl. 102 .2 ± O.2 cm"/ mol. com pa res fa vora bl y with th e va lue uf 102.5 c m"/ mol ob ta in ed fro m a rece nt correla ti on a nd is in s ubstanti a l di sagree ment with th e va lu e of 100.7 ± O.4 c m "/ mol de te rmin ed by Dad so n a nd cu· wo rk e rs fro m th e Burn e ll me thod and the pie zo me te r me thod .
燃烧e tt陆ppa对于年代一直在产品开发pe d th e de te rmina ti联合国佛罗里达大学th e cumpress ibilit y fac涂r佛罗里达大学气体,includin g corrus ive ha包厢倪c气体,0.1 n accurac y的pe远端控制设备nt 0.01 pe rcent在te mpera从0到225°c和介质温度压力250 ba rs。T他ppa l’A摘要有蜜蜂n thi s te迈普ra中使用真正的和媒体压力范围和T te迈普绝热分解温度在15°c c riti ca l te迈普ra真正sa mpl e的气体。该型压力传感器具有坚固耐用的结构，具有高灵敏度和高可靠性，可用于零压力传感器，可以在不含压力的情况下释放简单气体，从而提高了压力测量的精度，其精度在5万分之一以上。这一压力测量结果在20000年至少达到了1 / 2。对数据的约简进行了详细的讨论。Th e ca pa可靠性Th e ppa ra你公顷年代evalua泰德在te rm s的压缩ibilit y fac tor表示为一个有限扩散e压力或densit y vi里亚尔依斯攀离子和德扯下从rgo n da ta t 25°C和新闻保250 ba rs和te r女士只有一边的vi ri的l提示ffi cie nt的ca rbon diox ide基于数据50°C和压力很低35英航rs。陆Th e va e ubt ain ed毛皮thi s偏向一方的viria l C ~ e fli C e问。102 .2±O.2厘米" / mol. com pa res fa vora提单y th e va卢佛罗里达大学102.5 c m”/摩尔ob ta在ed从耐久性correla ti在年代ubstanti nd是l di sagree表示“状态”th e va陆e为100.7±O.4 c m”/摩尔德te rmin ed的爸爸所以n和铜·rk e m rs来回th e e燃烧诊断方法和派佐薇我te r诊断方法。
{"title":"A Burnett apparatus for the accurate determination of gas compressibility factors and second virial coefficients, and an evaluation of its capability based on some results for argon and carbon dioxide","authors":"M. Waxman, J. R. Hastings","doi":"10.6028/JRES.075C.017","DOIUrl":"https://doi.org/10.6028/JRES.075C.017","url":null,"abstract":"A Burn e tt a ppa ratu s has been deve lu pe d for th e de te rmina ti un uf th e cumpress ibilit y fac tu r uf gases, includin g corrus ive ha loge ni c gases, to a n accurac y of 0.1 pe rce nt to 0.01 pe rcent at te mpera tures fro m 0 to 225 °C and for pressures up to 250 ba rs. T he a ppa l'a tus has bee n used throughout thi s te mpe ra ture and press ure range and a t te mpe ratures within 15 °C of the c riti ca l te mpe ra ture of the sa mpl e gas. T he a ppa ra tu s fea lures a rugged ye t highl y sens iti ve and re prod ucibl e null-Iype press ure transdu ce r to isula te the sa mple gas witho ut inlrud uc in g a pressure uncert a int y grea te r tha n th e prec ision of the press ure measureme nts, whic h is be tt e r th an 1 pa rt in 50 ,000. The press ure measure ment s a re acc ura te to at leas t I pa rt in 20 ,000. Th e reduction of the da ta is di scussed ex tens ive ly. Th e ca pa bility of th e a ppa ra tu s ha s been evalua ted in te rm s of the compress ibilit y fac tor represented by a finit e pressure or densit y vi rial expans ion a nd de rived from a rgo n da ta a t 25 °C a nd press ures up to 250 ba rs and in te r ms of the secund vi ri a l cue ffi cie nt of ca rbon diox ide based on data at 50 °C a nd pressures be low 35 ba rs. Th e va lu e ubt ain ed fur thi s secund viria l c~e fli c i e nl. 102 .2 ± O.2 cm\"/ mol. com pa res fa vora bl y with th e va lue uf 102.5 c m\"/ mol ob ta in ed fro m a rece nt correla ti on a nd is in s ubstanti a l di sagree ment with th e va lu e of 100.7 ± O.4 c m \"/ mol de te rmin ed by Dad so n a nd cu· wo rk e rs fro m th e Burn e ll me thod and the pie zo me te r me thod .","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133467477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A fin ite·e le ment s truc tural analys is is described for a ppli ca tion to p roble ms in whi ch geu metry a nd loading a re axi symmetri c a nd mate ri al properti es are iso tropic e las ti c . An a tt em pt to minimize res tric ti ons imposed on the s ha pe a nd ori e ntatio n of the tri angula r finit.e·e le me nt s has been large ly s uccessful. This fac ilit a tes use of the ana lys is, with auto ma ti c finite·e leme nt mes h gene rati on , in pa ra me ter or optimizatio n studies. A se ri es of la borato ry tes ts to verify t.h e an a lys is a re desc ri bed in w hi ch the magnitude and di s tribution of bo unda ry load ing was known withi n na rrow limits.
{"title":"Formulation and experimental verification of an axisymmetric finite-element structural analysis","authors":"R. A. Mitchell, R. M. Woolley, C. Fisher","doi":"10.6028/JRES.075C.016","DOIUrl":"https://doi.org/10.6028/JRES.075C.016","url":null,"abstract":"A fin ite·e le ment s truc tural analys is is described for a ppli ca tion to p roble ms in whi ch geu metry a nd loading a re axi symmetri c a nd mate ri al properti es are iso tropic e las ti c . An a tt em pt to minimize res tric ti ons imposed on the s ha pe a nd ori e ntatio n of the tri angula r finit.e·e le me nt s has been large ly s uccessful. This fac ilit a tes use of the ana lys is, with auto ma ti c finite·e leme nt mes h gene rati on , in pa ra me ter or optimizatio n studies. A se ri es of la borato ry tes ts to verify t.h e an a lys is a re desc ri bed in w hi ch the magnitude and di s tribution of bo unda ry load ing was known withi n na rrow limits.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121596857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of directional couple rs 10 e xte nd the ra nge o f low-le ve l power mete rs is a we ll eS la bli shed technique. Calibration of bolome te r-couple r unil s up 1020 dB is routin e a l N BS a nd olh e r labora lories and allows powe r measure me n I 10 the I W le ve l. For hi g her couplin g ra lios , howeve r, Ihe proble ms in calibration us ing conve ntiona l lechniqu es becomes mo re diffi c ult. Thi s pape r describes a cascade method whi ch a llows ca libra lion of low powe r me ter-couple r co mbin a l ions for meas ure me nl up 10 th e mega wa lt ra nge. Th e technique is based upo n s ys le m lin ea ril Y a nd th e unce rt a inty limil s are s how n 10 be 1 pe rcenl to 1.5 pe rcenl us ing NBS low powe r sla nda rd s . By using the N BS ca libra li on se rvices and co mm e rc ia ll y ava il a bl e equipme nt , th e above power le ve ls ca n be me asured with un ce rtainty limil s less Ih a n 2.7 pe rce n!. The me thod ca n a lso be adapted to measure me nl of la rge couplin g ra lios (2080 dB). Res ult s are given for power (200 wa il S in WR90 waveguide) a nd co upling ra lio (40 dB coax ia l coupl e r) meas ure me nts.
使用方向辅助rs 10 e xte和ra nge of low-le power mete rs a我们将在la bli上添加技术。1020 Calibration bolome te r-couple r unil s up的分贝是日常e a l N b a和olh e r labora lories和allows粉r所拘束了我10《我的N W le l . g For嗨她couplin g ra lios,不过r, Ihe女士的问题在美国Calibration ing conve ntiona l lechniqu re机会c奥创冰变成了莫。我最喜欢的是低成本的狮子这电子技术是基于upo n s s m m m m m m m m m m m m m m m m m m m m由李用的N可以ca天秤座on se rvices和co毫米e rc他ll艾娃il y a bl e equipme nt, th e动力le头顶有一个ca是N我asured一起un ce rtainty limil s少一点a N 2。7 pe rce N !我想说的是，我愿意用la rge couplin g ra lios (2080 dB)来定义我。Res ult提供电力(WR90 waveguide中的200条线路)，我们提供电力(40条dB cows，这是最新的情报)。
{"title":"Accurate microwave high power measurements using a cascaded coupler method","authors":"Kenneth E. Bramall","doi":"10.6028/JRES.075C.019","DOIUrl":"https://doi.org/10.6028/JRES.075C.019","url":null,"abstract":"The use of directional couple rs 10 e xte nd the ra nge o f low-le ve l power mete rs is a we ll eS la bli shed technique. Calibration of bolome te r-couple r unil s up 1020 dB is routin e a l N BS a nd olh e r labora lories and allows powe r measure me n I 10 the I W le ve l. For hi g her couplin g ra lios , howeve r, Ihe proble ms in calibration us ing conve ntiona l lechniqu es becomes mo re diffi c ult. Thi s pape r describes a cascade method whi ch a llows ca libra lion of low powe r me ter-couple r co mbin a l ions for meas ure me nl up 10 th e mega wa lt ra nge. Th e technique is based upo n s ys le m lin ea ril Y a nd th e unce rt a inty limil s are s how n 10 be 1 pe rcenl to 1.5 pe rcenl us ing NBS low powe r sla nda rd s . By using the N BS ca libra li on se rvices and co mm e rc ia ll y ava il a bl e equipme nt , th e above power le ve ls ca n be me asured with un ce rtainty limil s less Ih a n 2.7 pe rce n!. The me thod ca n a lso be adapted to measure me nl of la rge couplin g ra lios (2080 dB). Res ult s are given for power (200 wa il S in WR90 waveguide) a nd co upling ra lio (40 dB coax ia l coupl e r) meas ure me nts.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132849551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Description of a refractory metal thermocouple research program, directed towards establishing the parameters that are necessary to achieve reliable, long term, high temperature thermocouple performance. A description of special apparatus for exposing bare-wire thermoelements to high temperatures in vacuum and in high purity gaseous environments is given, and the design and performance of an ultra-high-vacuum, high-temperature furnace system are described. Bare-wire W-3 per cent Re and W-25 per cent Re thermoelements were exposed at 2400 K in argon, hydrogen, or vacuum, and experienced a shift in their emf-temperature relationship upon initial exposure. After the initial shift, the thermoelements exposed in the gaseous environments experienced no significant further change in their emf-temperature relationship for periods up to 1000 hrs. The thermoelements exposed in vacuum continually drifted in their emf-temperature relationship as a result of the preferential loss of Re by evaporation.
{"title":"A program in refractory metal thermocouple research.","authors":"G. W. Burns, W. Hurst","doi":"10.6028/JRES.075C.013","DOIUrl":"https://doi.org/10.6028/JRES.075C.013","url":null,"abstract":"Description of a refractory metal thermocouple research program, directed towards establishing the parameters that are necessary to achieve reliable, long term, high temperature thermocouple performance. A description of special apparatus for exposing bare-wire thermoelements to high temperatures in vacuum and in high purity gaseous environments is given, and the design and performance of an ultra-high-vacuum, high-temperature furnace system are described. Bare-wire W-3 per cent Re and W-25 per cent Re thermoelements were exposed at 2400 K in argon, hydrogen, or vacuum, and experienced a shift in their emf-temperature relationship upon initial exposure. After the initial shift, the thermoelements exposed in the gaseous environments experienced no significant further change in their emf-temperature relationship for periods up to 1000 hrs. The thermoelements exposed in vacuum continually drifted in their emf-temperature relationship as a result of the preferential loss of Re by evaporation.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133671705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A rotating wavelength-independent optical attenuator is described that generates four radiance steps. Radiance ratios between the steps can be continuously varied. Experiments are performed to assess the operational characteri sti cs of the attenuator. Radiance is determined from measurements with a high-speed photoelec tric pyrometer. Recording of signals is made with a high-speed digital data acquisition system. The combined measuring and recording systems have a full-scale signal resolution of approximately one part in 8000 and a time r esolution of 0.4 ms. The results of several experiments on radi ance ratio measurements are found to be in agreement within one part in 1000.
{"title":"Rotating adjustable transmission optical step attenuator","authors":"A. Cezairliyan","doi":"10.6028/JRES.075C.010","DOIUrl":"https://doi.org/10.6028/JRES.075C.010","url":null,"abstract":"A rotating wavelength-independent optical attenuator is described that generates four radiance steps. Radiance ratios between the steps can be continuously varied. Experiments are performed to assess the operational characteri sti cs of the attenuator. Radiance is determined from measurements with a high-speed photoelec tric pyrometer. Recording of signals is made with a high-speed digital data acquisition system. The combined measuring and recording systems have a full-scale signal resolution of approximately one part in 8000 and a time r esolution of 0.4 ms. The results of several experiments on radi ance ratio measurements are found to be in agreement within one part in 1000.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115688868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Apparatus for impact-fatigue testing","authors":"R. E. Schramm, R. Durcholz, R. Reed","doi":"10.6028/JRES.075C.012","DOIUrl":"https://doi.org/10.6028/JRES.075C.012","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128426874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
POLARIZATION MEASUREMENTS OF STEEL PIPE SPECIMENS EXPOSED TO THE SOIL AT FOUR DAM SITES WERE MADE BY THE CORPS OF ENGINEERS (LOWER MISSISSIPPI VALLEY DIVISION) AND RELATED TO THE CORROSION OF STEEL PILING (UNDERGROUND) AT THE SITES. AS THE POLARIZATION MEASUREMENTS WERE MADE PERIODICALLY ON WEIGHED SPECIMENS FOR PERIODS AS LONG AS SEVEN YEARS, THE DATA OFFERED AN EXCELLENT OPPORTUNITY FOR EVALUATING THE ACCURACY AND PRACTICABILITY OF A POLARIZATION TECHNIQUE FOR MEASURING CORROSION RATES. REASONABLE AGREEMENT BETWEEN CALCULATED AND ACTUAL CORROSION ON THE SPECIMENS MADE IT POSSIBLE TO ESTIMATE MAXIMUM ANTICIPATED CORROSION ON THE PILING AFTER 50 YEARS OF EXPOSURE. INSTANTANEOUS CORROSION RATES WERE ALSO MEASURED ON TWO DRIVEN PIPE PILES, 72 FT (22 M) AND 19 FT (5.8 M) IN LENGTH, BOTH OF WHICH HAD BEEN EXPOSED FOR 12 YEARS. ONE MONTH LATER, THE SHORT PILE WAS EXTRACTED AND EXAMINED. RELATIVELY LOW CORROSION RATES, CALCULATED FROM THE POLARIZATION DATA, WERE VERIFIED BY THE APPEARANCE OF THE PILE AND BY THE LIMITED EXTENT OF THE PITTING. /AUTHOR/
{"title":"POLARIZATION MEASUREMENTS AS RELATED TO CORROSION OF UNDERGROUND STEEL PILING","authors":"W. Schwerdtfeger","doi":"10.6028/JRES.075C.014","DOIUrl":"https://doi.org/10.6028/JRES.075C.014","url":null,"abstract":"POLARIZATION MEASUREMENTS OF STEEL PIPE SPECIMENS EXPOSED TO THE SOIL AT FOUR DAM SITES WERE MADE BY THE CORPS OF ENGINEERS (LOWER MISSISSIPPI VALLEY DIVISION) AND RELATED TO THE CORROSION OF STEEL PILING (UNDERGROUND) AT THE SITES. AS THE POLARIZATION MEASUREMENTS WERE MADE PERIODICALLY ON WEIGHED SPECIMENS FOR PERIODS AS LONG AS SEVEN YEARS, THE DATA OFFERED AN EXCELLENT OPPORTUNITY FOR EVALUATING THE ACCURACY AND PRACTICABILITY OF A POLARIZATION TECHNIQUE FOR MEASURING CORROSION RATES. REASONABLE AGREEMENT BETWEEN CALCULATED AND ACTUAL CORROSION ON THE SPECIMENS MADE IT POSSIBLE TO ESTIMATE MAXIMUM ANTICIPATED CORROSION ON THE PILING AFTER 50 YEARS OF EXPOSURE. INSTANTANEOUS CORROSION RATES WERE ALSO MEASURED ON TWO DRIVEN PIPE PILES, 72 FT (22 M) AND 19 FT (5.8 M) IN LENGTH, BOTH OF WHICH HAD BEEN EXPOSED FOR 12 YEARS. ONE MONTH LATER, THE SHORT PILE WAS EXTRACTED AND EXAMINED. RELATIVELY LOW CORROSION RATES, CALCULATED FROM THE POLARIZATION DATA, WERE VERIFIED BY THE APPEARANCE OF THE PILE AND BY THE LIMITED EXTENT OF THE PITTING. /AUTHOR/","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125070192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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