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Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation最新文献

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Sensitivity of a correlation radiometer 相关辐射计的灵敏度
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/JRES.071C.016
J. Faris
{"title":"Sensitivity of a correlation radiometer","authors":"J. Faris","doi":"10.6028/JRES.071C.016","DOIUrl":"https://doi.org/10.6028/JRES.071C.016","url":null,"abstract":"The corre lation radiometer is analyzed to determine the sensitivity that can be obtained under various o perating conditions. The rad iometer using a s ine wave comparison signal is analyzed and compared with the usual radiometer that e mploys a random noise for the comparison s ignal. Tt is found that the radiometer e mploying the s in e wave comparison s ignal is the more sf' ns itive of the two circuits , particularly in the case that the effect ive tem perature of the input noi se signal is greater than the effec tive input temperature of the amplifiers . It is s hown that if nonidentical ampl ifiers are used in the corre lation circuit, the properties of the rad iometer are determined by the portion of the amplifie r respon se fun ctions in the frequency interval that the two response functions ove rl ap. Th .. effect of amplifier ga in flu c tu ations are consid e red. and although the corre lat ion scheme red uces the e ffec t of ga in flu c tuations, it is s hown th at th ey st ill do contribute to the output Au c tu ations of the radiometer. Calc ula tions a re included showing that the e ffec t of a diffe rential phase s hift betwee n the two c han· nel s is a reduction in radiometer se nsi tivity . Th e same co nc lusion is reached concerning the effect of a diffe rential t ime de lay. Fina lly. it is sho wn th at if the co mparison s ignal and the input s ignal have the same statistical properties, the requireme nt s o n the multiplier ar .. less stringe nt th a n if the two s ignals have different s tati s ti cal properties.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133480380","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}
引用次数: 19
A 2:1 ratio inductive voltage divider with less than 0.1 ppm error to 1 MHz 2:1比例电感分压器，对1mhz误差小于0.1 ppm
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/JRES.071C.012
C. Hoer, W. L. Smith
{"title":"A 2:1 ratio inductive voltage divider with less than 0.1 ppm error to 1 MHz","authors":"C. Hoer, W. L. Smith","doi":"10.6028/JRES.071C.012","DOIUrl":"https://doi.org/10.6028/JRES.071C.012","url":null,"abstract":"A s impl e rati o tr a ns forme r ha ving a 2 :] ra tio of inpul vollage 10 uUlput vo lt a ge c an bc made wil h a ratio e rror less Ih a n 0.1 pp m from 1 kH z 10 a bo ve ] MH z. Applica tion s and sources uf e rror are disc ussed . Experim ent al res ults leadin g to an optimulll tra nsform er des i{! 11 arc ~ i ve n . A bri dge 10 measure the ra ti o e rror to 0 .025 ppm fro m 1 kHz to 1 MHz is al so desc rib ed .","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128226587","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}
引用次数: 7
Determination and smoothing of Fourier coefficients representing piecewise continuous functions 表示分段连续函数的傅里叶系数的确定和平滑
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/jres.071c.011
B. Peavy
{"title":"Determination and smoothing of Fourier coefficients representing piecewise continuous functions","authors":"B. Peavy","doi":"10.6028/jres.071c.011","DOIUrl":"https://doi.org/10.6028/jres.071c.011","url":null,"abstract":"This pape r present s a method of solving for Fourier coe ffi c ien ts where the dependent variable ca n be e xpressed as a piece wise continuou s fun c tion , whe n various conditions of continuity and s moothing are ass umed. An e xample is inc luded 10 show th e e ffec t of s moothing in the region of a di scontinuity for a sys tem co mposed of Iwo ma le rial s tha t e xhibit a d iscontinuilY a t Ihe ir interface a nd surro unded by a third materia l whic h does nOI have a di sco ntinuit y. An advanlage to be ga ine d from s nlOothin g is a n inc rease in the conve rge nce of a finit e Fourier se ri es re prese nt a tion of a piecewi se co ntinu ous fun c tion in the region of the di scontinuities.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128195641","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}
引用次数: 0
Reproducibility of germanium resistance thermometers at 4.2 °K 锗电阻温度计在4.2°K下的再现性
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-10-01 DOI: 10.6028/JRES.070C.023
M. H. Edlow, H. Plumb
{"title":"Reproducibility of germanium resistance thermometers at 4.2 °K","authors":"M. H. Edlow, H. Plumb","doi":"10.6028/JRES.070C.023","DOIUrl":"https://doi.org/10.6028/JRES.070C.023","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132850588","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}
引用次数: 12
Notes on the use of propagation of error formulas 关于误差传播公式使用的注意事项
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-10-01 DOI: 10.6028/JRES.070C.025
H. H. Ku
{"title":"Notes on the use of propagation of error formulas","authors":"H. H. Ku","doi":"10.6028/JRES.070C.025","DOIUrl":"https://doi.org/10.6028/JRES.070C.025","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125450953","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}
引用次数: 362
The apparent thermal radiation properties of an isothermal V-groove with specularly reflecting walls 具有镜面反射壁的等温v型槽的视热辐射特性
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-10-01 DOI: 10.6028/JRES.070C.026
R. B. Zipin
{"title":"The apparent thermal radiation properties of an isothermal V-groove with specularly reflecting walls","authors":"R. B. Zipin","doi":"10.6028/JRES.070C.026","DOIUrl":"https://doi.org/10.6028/JRES.070C.026","url":null,"abstract":"Rece ntl y the re has been a great deal 0(' work reo ported in the literature on the problem of predicting the appare nt thermal radiation properti es of cavities and rough surfaces when the properties of ideally smooth surfaces of the same material are known. An interesting problem that has not been previously treated very completely is reRection by an iso thermal V -groove, whose walls are specularly reRecting. Sparrow and Lin [3]1 have reported some results for the effec tive absorptance of suc h a groove. Their method of analysis is followed here using a simpler procedure, extended somewh at, and results are given for effec tive directional re Rectance. The main limitation on the results reported here is due to the assumption tha t the V -groove has spec ular walls. This assumption is valid when the wavelength of the incident radiation is much less than the characteristic dime nsions of the groove, and at the same time much greater than the characteristic dimensions of the roughness of the groove walls. Experimental results re ported by the author [4] have shown this to be true.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130355491","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}
引用次数: 16
Some techniques for measuring small mutual inductances 测量小互感的一些技术
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-10-01 DOI: 10.6028/JRES.070C.021
D. Homan
{"title":"Some techniques for measuring small mutual inductances","authors":"D. Homan","doi":"10.6028/JRES.070C.021","DOIUrl":"https://doi.org/10.6028/JRES.070C.021","url":null,"abstract":"A recent theore tical s tud y by Page [1] t suggests the desirability of making accurate measurements of mutual induc tance a t the 0.1 /LH level and of stepping up to larger values. An experimental bridge has been cons tructed for the purpose of inves tigating some techniques whic h seemed appropriate in this range. Some of those techniques which appear to be particularly useful are described in this paper. The bridge is a transformer-ratio-arm bridge, having a ratio of 10 to 1, a nd has been designed to compare mutual inductors through five orders of magnitude, from 0.1 /LH to 1 mH at a frequency of 1592 Hz. Sensitivity of a part in 107 is achieved at the O.I/LH to I/LH level provided the inductors carry 3A in their primary windings.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125383503","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}
引用次数: 2
Deflection of centrally loaded thin circular elastic plates on equally spaced point supports 在等间距的点支撑物上中心载荷的薄圆形弹性板的挠度
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-10-01 DOI: 10.6028/JRES.070C.022
A. F. Kirstein, W. Pell, R. M. Woolley, L. J. Davis
{"title":"Deflection of centrally loaded thin circular elastic plates on equally spaced point supports","authors":"A. F. Kirstein, W. Pell, R. M. Woolley, L. J. Davis","doi":"10.6028/JRES.070C.022","DOIUrl":"https://doi.org/10.6028/JRES.070C.022","url":null,"abstract":"Bassali 's general theory for the fl exure of the thin c irc ular elast ic pl a te supported at a n a rbitrary numbe r of points and subjec ted to transverse load ove r an ecce ntri c circle is specialized to the case of a centrally loaded plate s upporte d at points equally s paced on a c ircle concentric with th e ce nte r. Simplified me thods for approximating the results predicted by the more complicated theore tical ex· pressions for defl ec tion are presented along with the expe rim ental result s from 138 tes ts . Both the ex perimental results a nd the simplified equations a re co mpa red with the th eory and agreement is fo und to be good.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124324386","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}
引用次数: 10
Calibration of vibrating-sample magnetometers 校正振动样品磁强计
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-10-01 DOI: 10.6028/JRES.070C.024
W. Case, R. D. Harrington
{"title":"Calibration of vibrating-sample magnetometers","authors":"W. Case, R. D. Harrington","doi":"10.6028/JRES.070C.024","DOIUrl":"https://doi.org/10.6028/JRES.070C.024","url":null,"abstract":"An evaluation of two of the most widely accepted methods for calibrating vibrating-sample magneto mete rs is gi ven. The comparison method uses a mate rial of known magnetization such as pure ni ckel. In the slope me thod, the magnetometer is calibrated from the low field linear slope of the magnetization c urve of a sa mple of high permeability. ' The primary source of error in the comparison method arises from an uncertainty in the absolute magnetization of nickel and its dependence on environmental conditions. The s tudy indicated that better accuracy can be expected from the slope method. T he use of pure iron in thi s method was found prefe rable to high permeability ferrites.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450905","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}
引用次数: 14
Magnetic transformation and the influence of plastic strain on the shear modulus of Fe-Cr-Ni alloys 磁转变及塑性应变对Fe-Cr-Ni合金剪切模量的影响
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-07-01 DOI: 10.6028/JRES.070C.020
R. Mikesell, R. Reed
{"title":"Magnetic transformation and the influence of plastic strain on the shear modulus of Fe-Cr-Ni alloys","authors":"R. Mikesell, R. Reed","doi":"10.6028/JRES.070C.020","DOIUrl":"https://doi.org/10.6028/JRES.070C.020","url":null,"abstract":"The Fe18C r-9Ni a nd F'e19C r-9N i a ll uys ex hi b it a dec rease in s hea r modulu s be tween 76 a nd 20 °K_ S usce ptibi li t y meas ure me nt s cu nfirm th a t a pa ra magne ti c to a ntife rromagn e ti c tra ns iti un occ urs a t about 40 OK in th ese a ll uys . Th e s hea r mudu lus fo r th e Fe-25C r-21 N i a ll oy d id no t d ec rease be tween 76 and 20 OK whi c h was c un s is te nt with th e fa c t th a t th e a ll oy rema ine d pantma\"ne ti c to 4 oK. Th e effec t of co ld-wo rk o n th e s he ar modulu s a buve and be low th e Nee lt e mpe ra ture is di~c usse d.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123044558","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}
引用次数: 1
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