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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 optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power in fiber optic systems. Other general purpose light power measuring devices are usually called radiometers , photometers , laser power meters (can be photodiode sensors or thermopile laser ...
There are two basic principles of measurement for distributed sensing technology, OTDR (optical time-domain reflectometry) and OFDR (optical frequency-domain reflectometry). For distributed temperature sensing often a code correlation technology [ 2 ] [ 3 ] [ 4 ] is employed which carries elements from both principles.
The equivalent device for optical fiber is an optical time-domain reflectometer. Time-domain transmissometry (TDT) is an analogous technique that measures the transmitted (rather than reflected) impulse. Together, they provide a powerful means of analysing electrical or optical transmission media such as coaxial cable and optical fiber.
One application is the use of a tympanometer (a specialised acoustic reflectometer) to diagnose medical conditions of the ear. [1] Ultrasonic reflectometry: A transducer generates acoustic waves at ultrasonic frequency which propagate until they reaches the interface between the propagation medium and the sample. The wave is partially reflected ...
OTDR – optical time domain reflectometry; OTIP – operational testing implementation plan; OTL – operations team leader; OTP – operational test procedure; OTR – order to remit; OTSG – one-time through steam generator; OWC – oil-water contact; OUT – outpost, Lahee classification; OUT – oil up to; OVCH – oversize charts
In general, a photo-reflectometer consists of an intensity modulated "pump" light beam used to modulate the reflectivity of the sample, a second "probe" light beam used to measure the reflectance of the sample, an optical system for directing the pump and probe beams to the sample, and for directing the reflected probe light onto a ...
Some scientific instruments commonly designated reflectometer are: . Vector network analyser (VNA); Optical time domain reflectometer; Reflectometer (electronics): In electronics, a directional coupler containing matched calibrated detectors in both arms of the auxiliary line, or a pair of single-detector couplers oriented so as to measure the electrical power flowing in both directions in the ...
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