{"title":"在超高频和微波波段测量的绝对冷参考","authors":"M. Limon, C. Marchioni, G. Sironi","doi":"10.1088/0022-3735/22/11/014","DOIUrl":null,"url":null,"abstract":"The authors describe a cold source operating at liquid helium temperature, used for absolute calibrations during radioastronomical observations at 600 MHz and 2500 MHz. Made with commercial dummy loads and coaxial cables in a standard Dewar bottle, it operates both at liquid helium and liquid nitrogen temperatures. A procedure for measuring the effective noise temperature of the source is described.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"11 1","pages":"963-966"},"PeriodicalIF":0.0000,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":"{\"title\":\"An absolute cold reference for measurements at UHF and in the microwave band\",\"authors\":\"M. Limon, C. Marchioni, G. Sironi\",\"doi\":\"10.1088/0022-3735/22/11/014\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The authors describe a cold source operating at liquid helium temperature, used for absolute calibrations during radioastronomical observations at 600 MHz and 2500 MHz. Made with commercial dummy loads and coaxial cables in a standard Dewar bottle, it operates both at liquid helium and liquid nitrogen temperatures. A procedure for measuring the effective noise temperature of the source is described.\",\"PeriodicalId\":16791,\"journal\":{\"name\":\"Journal of Physics E: Scientific Instruments\",\"volume\":\"11 1\",\"pages\":\"963-966\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1989-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"7\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Physics E: Scientific Instruments\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1088/0022-3735/22/11/014\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics E: Scientific Instruments","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/0022-3735/22/11/014","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
An absolute cold reference for measurements at UHF and in the microwave band
The authors describe a cold source operating at liquid helium temperature, used for absolute calibrations during radioastronomical observations at 600 MHz and 2500 MHz. Made with commercial dummy loads and coaxial cables in a standard Dewar bottle, it operates both at liquid helium and liquid nitrogen temperatures. A procedure for measuring the effective noise temperature of the source is described.
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