NIST staff develop microwave power standard for Singapore Standards Board. (News Briefs).NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. microwave power standards consist of microcalorimeters as primary reference standards and bolometric bo·lom·e·ter n. An instrument that measures radiant energy by correlating the radiation-induced change in electrical resistance of a blackened metal foil with the amount of radiation absorbed. detectors as secondary transfer standards. NIST builds and maintains both standards for its own use and also builds bolometric detectors for other standards laboratories. NIST staff members built a microcalorimeter for the Singapore Productivity and Standards Board (PSB PSB Pet Shop Boys (band) PSB Public Service Broadcasting (radio and television) PSB Public Service Board (Vermont) PSB Public Security Bureau (China) ) and delivered it to them in November 2000. It has a Type N coaxial connector and is used for frequencies from 50 MHz to 18 GHz. This connector type is popular among manufacturers and is used in our highest volume calibration services. The performance of the Singapore microcalorimeter was compared with an earlier microcalorimeter in use at NIST. Two NIST Type N bolometric detectors that were purchased by PSB several years ago were used as transport standards in this comparison. The effective efficiency of the two bolometer bolometer (bōlŏm`ətər, bə–), instrument for detecting and measuring radiation, e.g., visible light, infrared radiation, and ultraviolet radiation, in amounts as small as one millionth of an erg. mounts was measured in the PSB calorimeter calorimeter: see calorimetry. calorimeter Device for measuring heat produced during a mechanical, electrical, or chemical reaction and for calculating the heat capacity of materials. in Singapore in June and in the NIST calorimeter in July. The efficiencies agreed within 0.0015 at all 41 frequencies measured. The expanded uncertainty for the NIST measurement ranges from 0.0024 at low frequencies to 0.0045 at 18 GHz. CONTACT: Tom Crowley, (303) 497-4133; crowley@boulder.nist.gov. |
|
||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion