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Time-domain reflectometer for cable fault detection. A time-domain reflectometer ( TDR) is an electronic instrument used to determine the characteristics of electrical lines by observing reflected pulses . It can be used to characterize and locate faults in metallic cables (for example, twisted pair wire or coaxial cable ), [ 1] and to locate ...
Trustworthy Repositories Audit & Certification. Trustworthy Repositories Audit & Certification (TRAC) is a document describing the metrics of an OAIS -compliant digital repository that developed from work done by the OCLC / RLG Programs and National Archives and Records Administration (NARA) task force initiative. [1]
Spread-spectrum time-domain reflectometry ( SSTDR) is a measurement technique to identify faults, usually in electrical wires, by observing reflected spread spectrum signals. This type of time-domain reflectometry can be used in various high-noise and live environments. Additionally, SSTDR systems have the additional benefit of being able to ...
An OTDR. An optical time-domain reflectometer ( OTDR) is an optoelectronic instrument used to characterize an optical fiber. It is the optical equivalent of an electronic time domain reflectometer which measures the impedance of the cable or transmission line under test. An OTDR injects a series of optical pulses into the fiber under test and ...
A TDR moisture sensor employs time-domain reflectometry (TDR) to measure moisture content indirectly based on the correlation to electric and dielectric properties of materials, such as soil, agrarian products, snow, wood or concrete . Measurement usually involves inserting a sensor into the substance to be tested and then applying either ...
The Interstate TDR was an early unmanned combat aerial vehicle — referred to at the time as an "assault drone" — developed by the Interstate Aircraft and Engineering Corporation during the Second World War for use by the United States Navy. Capable of being armed with bombs or torpedoes, 2000 aircraft were ordered, but only around 200 were ...
Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. Technical standards exist to provide glossaries of ...
Willem Lambertus Vos (born August 30, 1964, Amstelveen) is a Dutch scientist.He is Professor of Physics at the University of Twente and former group leader at the Institute for Atomic and Molecular Physics "AMOLF" In 2004, with his group members, Peter Lodahl et al. they succeeded in controlling the pace of light emission, varying from a light drizzle to a rainstorm.