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399 results about "Time-domain reflectometer" patented technology
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A time-domain reflectometer (TDR) is an electronic instrument used to determine the characteristics of electrical lines by observing reflected waveforms. It can be used to characterize and locate faults in metallic cables (for example, twisted pair wire or coaxial cable). It can also be used to locate discontinuities in a connector, printed circuit board, or any other electrical path.
Passive time domain reflectometer for HFC network
ActiveUS9414126B1High detection sensitivityHigh sensitivityTelevision systemsLine-transmission monitoring/testingTime-domain reflectometerCable transmission
Detecting a linear impairment in a cable under test by using a random signal transmitted down the cable. The impairment causes a reflected signal to be combined with the random signal. The combined signal extends over a plurality of sub-bands. A method and apparatus perform the steps of: (a) receiving the combined signal from a test point upstream from the impairment; (b) tuning to each sub-band and receiving a part of the combined signal within each sub-band; (c) determining an autocorrelation function of each part of the combined signal of each sub-band, to produce a plurality of autocorrelation functions; (d) combining the autocorrelation functions to form a combined function; (e) detecting the reflected signal from the combined function; and (f) determining, from the combined function, a time delay associated with the reflected signal and the distance from the test point to the impairment.
Owner:ARCOM DIGITAL
System and method for determining downhole conditions
ActiveUS20050274513A1Characteristic can be alteredSurveyConstructionsTime domainTime-domain reflectometer
The present invention provides a system for determining downhole conditions including a time domain reflectometer (172) that is operable to generate a transmission signal and receive a reflected signal. A tubular (192) is positioned downhole in a downhole medium (214, 216, 218, 220, 222) and a waveguide (186), which is in electrical communication with the time domain reflectometer (172), is operably contacting the downhole (214, 216, 218, 220, 222). The waveguide (186) is operable to propagate the transmission signal and operable to propagate the reflected signal that is generated responsive to an electromagnetic property of the downhole medium (214, 216, 218, 220, 222).
Owner:HALLIBURTON ENERGY SERVICES INC
Passive optical network (PON) in-band optical time domain reflectometer (OTDR)
ActiveUS20110013904A1Material analysis by optical meansTransmission monitoringSignal onNetwork Communication Protocols
An in-band OTDR uses a network's communication protocols to perform OTDR testing on a link. Because the OTDR signal (probe pulse) is handled like a data signal, the time required for OTDR testing is typically about the same as the time required for other global network events, and is not considered an interruption of service to users. A network equipment includes an optical time domain reflectometry (OTDR) transmitter and receiver, each operationally connected to a link to transmit and receive, respectively, an OTDR signal. When an OTDR is to be performed, a network device operationally connected to the link actuates the OTDR transmitter to transmit the OTDR signal on the link during a determined test time based on a communications protocol of the link, during which data signals are not transmitted to the network equipment. A processing system processes the OTDR signal to provide OTDR test results.
Owner:MICROSEMI ISRAEL STORAGE SOLUTIONS LTD
Method and apparatus for remotely changing signal characteristics of a signal generator
InactiveUS6160405AMinimal and even additional costElectrical testingSupervisory/monitoring/testing arrangementsTime-domain reflectometerTime domain
A detector and a variable signal generator are coupled so that one or more specific changes in the output of the detector will cause a change in the characteristics of the generated signal. This change in signal characteristics is non-transient, the change remaining in effect until such time that another change in the detector output causes another change in the signal characteristic. The system can provide remote-end positive wire identification with no additional instrumentation at the remote end. When this invention is embodied in an already existing piece of test equipment, such as a multimeter or time domain reflectometer, there need be no additional hardware instrumentation at either end.
Owner:JOHN FLUKE MFG CO INC
Method and apparatus for remotely changing signal characteristics of a signal generator
InactiveUS6323654B1Minimal and even additional costFault location by increasing destruction at faultFault location by pulse reflection methodsTime-domain reflectometerTime domain
Owner:JOHN FLUKE MFG CO INC
Time-domain reflectometer for testing terminated network cable
ActiveUS6856138B2Baseband system detailsResistance/reactance/impedenceTime-domain reflectometerTime domain
A time domain reflectometer having a first impedance when in a first test mode and a second impedance when in a second test mode. The first impedance is substantially the same as the nominal characteristic impedance of a network link cable not connected to a network and the second impedance is substantially different from the impedance of a network link cable that is terminated into a network. A method for measuring the length of a terminated network cable includes the steps of determining that the network cable is terminated at a network, selecting a test mode suitable for testing the terminated network cable, and performing time domain reflectometry testing on the terminated network cable.
Owner:LINKRUNNER LLC
Adaptive pulse width time domain reflectometer
ActiveUS8222906B2Automatic exchangesFault location by pulse reflection methodsTime-domain reflectometerTime domain
Owner:VIAVI SOLUTIONS INC
Passive optical network optical time-domain reflectometry
InactiveUS20080031624A1Material analysis by optical meansTime-division multiplexTime-domain reflectometerOptical test
Optical Time-Domain Reflectometer (OTDR) troubleshooting of a passive optical network (PON) can be enhanced by deploying cascaded splitters, at least some of which have multiple inputs. That is, at least some of the splitters in the PON have not only a first input coupleable to the optical line terminator (OLT) or output of another splitter but also a second input directly coupleable to an Optical Time-Domain Reflectometer (OTDR). Optical time-delay reflectometry can be performed upon a selected portion or segment of the PON by selecting a splitter and transmitting an optical test signal from the OTDR directly to the input of the selected splitter and analyzing the reflected signal.
Owner:ALCATEL LUCENT SAS
Network Traffic-Compatible Time Domain Reflectometer
ActiveUS20170104522A1Interference on networkMaximize time resolutionTime-division optical multiplex systemsPilot signal allocationTime-domain reflectometerTime domain
A TDR for locating impairments in an HFC network is claimed. The network carries burst signals in an upstream band during burst intervals. The TDR comprises a transmitter, receiver, level detector, controller, accumulator, and probe detector. The transmitter transmits probe signals to the impairment, causing a reflection of the probe signals. Each probe signal is in the upstream band and has a bandwidth extending the width of the upstream band. The receiver receives the reflected probe signals during receiving intervals, and receives the burst signals during receiving intervals that overlap burst intervals. The level detector measures a level of the signals received during each receiving interval. The controller determines which of the receiving intervals are free of burst signals, based on the level measurement. The accumulator accumulates reflected probe signals received during intervals free of burst signals. The probe detector detects the impairment from the accumulated probe signals and estimates a time delay for the impairment. A distance to the impairment is estimated from the time delay.
Owner:ARCOM DIGITAL
BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof
InactiveCN101839698AAccurate measurementHigh measurement accuracyThermometers using physical/chemical changesThermometer testing/calibrationTime domainOptical power
Owner:NANJING UNIV
High performance time domain reflectometry
InactiveUS20120274338A1Easy alignmentProviding mechanical stabilityResistance/reactance/impedenceMeasurement leads/probesTime domainHigh bandwidth
Methods and systems for high-bandwidth time domain reflectometry include a printed circuit board (PCB) and a probe. The PCB includes at least one signal terminal connected to at least one signal via at least three guide terminals arranged around the at least one high-frequency signal terminal. At least one of the guide terminals is connected to at least one ground via. The probe includes at least one biased pin to contact the at least one signal terminal and at least three fixed guide pins arranged about the at least one biased pin to facilitate alignment of said at least one biased pin by first engaging at least one guide terminal area, such that the at least one mechanically biased pin is guided to the at least one contact point.
Owner:IBM CORP
Time-domain reflectometer
ActiveUS7977950B2Extension of timeRange of measured responsesResistance/reactance/impedenceFault location by pulse reflection methodsTime-domain reflectometerTime domain
The present invention provides a time domain reflectometer for testing an electrical cable. The time domain reflectometer includes a test signal generator, at least one line feed resistor, connected between the test signal generator and a pair of terminals, for connection to the ends of the electrical cable under test, and a signal processor, connected to the terminals, to receive a line signal including a reflection of a test signal transmitted into the cable under test. The signal processor is programmed to filter the line signal to enhance a portion of the signal indicative of any fault on the cable by balancing the signal according to the electrical characteristics of a normal cable of the same type as the cable under test by applying a filter function, and acquiring at least one estimate of the input admittance of the transmission line from known or estimated electrical characteristics of the cable under test.
Owner:RADIODETECTION
Time domain reflectometer touch screen sensor
InactiveUS20110128257A1Input/output processes for data processingTime-domain reflectometerTime domain
TDR (time domain reflection) technology may be used in optical domain or in electrical domain. For electrical TDR, single layer ITO glass may form a transmission line as a base TDR touch sensor. When the touch sensor is paired, the existing internal metal line of the display device may be reused as a TDR sensor and the ITO glass may be removed. When touched, the TDR profile is changed dynamically from baseline to the particular profile due to its dynamic impedance profile change across the display screen. Likewise, for optical TDR touch sensing, 2 dimensional optical slab waveguide is used to carry OTDR signal. When touched, the profile is changed due to this perturbation mainly by evanescent field changes on that particular position.
Owner:KIM KIHONG JOSHUA
Chaotic optical time domain reflectometer method and apparatus
ActiveUS20100290035A1Avoid disadvantagesHigh resolutionAmplifier modifications to reduce noise influenceDigital computer detailsFiberFiber coupler
In a method and a corresponding apparatus for performing chaotic optical time domain reflectometer, the chaotic laser signal, generated by the chaotic laser transmitter, is split into probe signal I and reference signal II by a fiber coupler. Through an optical circulator, the probe signal I is launched into the test fiber and the echo light is converted into electrical signal by a photodetector and digitalized by an A / D converter. The reference signal II is converted into electrical signal by a photodetector and digitalized by another A / D converter. Two digital signals received from two A / D converters are correlated in a signal processing device to locate the exact position of faults in fibers. The result output is then displayed on a display device. This invention was developed to overcome the tradeoff between resolution and dynamic range of the pulse-based OTDR. This method can improve the dynamic range and spatial resolution significantly; enhance the anti-jamming capability and noise tolerance. Also it has merits of simple structure and lower cost.
Owner:TAIYUAN UNIV OF TECH
Reflectometry real time remote sensing for in situ hydrocarbon processing
ActiveUS20100223011A1Electric/magnetic detection for well-loggingSurveyTime-domain reflectometerElectrical conductor
A method and apparatus for sensing conditions in a subsurface geologic formation heated for the extraction of hydrocarbons is disclosed. A time domain reflectometer in conjunction with an open wire transmission line is employed in real time to determine impedance discontinuities in the geologic formation. These impedance discontinuities correspond to physical conditions in the geologic formation. The open wire transmission line can include pipes running into the subsurface geologic formation or other conductors, including a split tube well casing. The method may operate in the low frequency window for subsurface electromagnetic propagation.
Owner:HARRIS CORP
Method for simultaneously measuring distributed type temperatures and strain
ActiveCN103674084AReduce complexityReduce manufacturing costThermometers using physical/chemical changesUsing optical meansTime-domain reflectometerRayleigh scattering
The invention provides a method for simultaneously measuring distributed type temperatures and strain. A brillouin optical time domain reflectometer and a coherent light time domain reflectometer share the same optical path system and the same circuit system and serve as a sensing measurement system. The sensing measurement system works in a BOTDR mode and a COTDR mode in an alternate mode to measure a brillouin scattering spectrum and a Rayleigh scattering spectrum which are distributed along a single single-mode sensing optical fiber and detect the frequency shift of the brillouin scattering spectrum and the frequency shift of the Rayleigh scattering spectrum, a linear equation set in two unknowns about the temperature and the strain is set up according to the characteristic that the frequency shift of the two scattering spectra is in the linear relationship with the temperature and the strain, and the temperature and the strain of each position of the sensing optical fiber can be obtained by solving the equation set, and then the temperatures and the strain distributed along the whole sensing optical fiber can be obtained. According to the method, the complexity and the manufacturing cost of the system are greatly reduced, no special requirement for the brillouin frequency shift coefficient of the optical fiber exists, and the application range of the measurement system is enlarged.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Optical line terminal (OLT) optical module integrating optical time domain reflectometer (OTDR) monitoring function
ActiveCN102170309AElectromagnetic transceiversStar-type electromagnetic networksTime-domain reflectometerOptical line termination
The invention discloses an optical line terminal (OLT) optical module, which comprises an optical device, a passive optical network (PON) data signal driver, a PON data signal amplitude limiting amplifier and an optical time domain reflectometer (OTDR) data processing module, wherein the optical device comprises a wavelength division multiplexer (WDM). The OLT optical module can simplify a network wiring structure, and compared with the prior art, reduces OTDR equipment and the WDM as well as the wiring difficulties and network cost of a PON system.
Owner:SOURCE PHOTONICS CHENGDU
System and method for determining downhole conditions
The present invention provides a system for determining downhole conditions including a time domain reflectometer (172) that is operable to generate a transmission signal and receive a reflected signal. A tubular (192) is positioned downhole in a downhole medium (214, 216, 218, 220, 222) and a waveguide (186), which is in electrical communication with the time domain reflectometer (172), is operably contacting the downhole (214, 216, 218, 220, 222). The waveguide (186) is operable to propagate the transmission signal and operable to propagate the reflected signal that is generated responsive to an electromagnetic property of the downhole medium (214, 216, 218, 220, 222).
Owner:HALLIBURTON ENERGY SERVICES INC
Optical Transceiver Integrated with Optical Time Domain Reflectometer Monitoring
ActiveUS20120243863A1Improve protectionGuaranteed successTransmission monitoringTransmission monitoring/testing/fault-measurement systemsTime-domain reflectometerTime domain
An optical transceiver having an integrated optical time domain reflectometer monitoring unit and methods for using the same are disclosed. The disclosure relates to an optical transceiver comprising an optical device comprising a wavelength division multiplexing system (WDM), a data signal driver, a data signal limiting amplifier, and an optical time domain reflectometer (OTDR) data processing module. Furthermore, the optical transceiver is particularly advantageous in an optical line terminal (OLT) and / or a passive optical network (PON). The integrated OTDR data processing module can protect the optical transceiver, ensure successful monitoring data, simplify network wiring and decrease system and network costs by decreasing the number of OTDR modules and WDM units.
Owner:SOURCE PHOTONICS
Apparatus for and method of cable diagnostics utilizing time domain reflectometry
ActiveUS7245129B2Improve accuracyEliminate needResistance/reactance/impedenceFault location by pulse reflection methodsTime domainTime-domain reflectometer
Owner:TEXAS INSTR INC
Spontaneous Brillouin scattering optical time domain reflectometer based on superconductive nanowire single-proton detector
InactiveCN102506904AHigh sensitivityShorten Jitter TimeMitigation of undesired influencesTime-domain reflectometerRayleigh scattering
The invention discloses a spontaneous Brillouin scattering optical time domain reflectometer (BOTDR) based on a superconductive nanowire single-proton detector, which is characterized in that an optical pulse emitted by an optical pulse generating unit is coupled to a sensing optical fiber through a circulator, backward scattered light scattered from the sensing optical fiber is subjected to filtration of rayleigh scattering light through an optical filter unit to obtain Brillouin scattering light, a back scattering light signal is detected by the superconductive nanowire single-proton detector, an electric signal output from the superconductive nanowire single-proton detector is acquired and processed by a data acquiring and processing unit, and finally, a result is obtained through a certain demodulation relation. Compared with the traditional BOTDR, the BOTDR provided by the invention is used for carrying out data acquisition and processing by adopting the noise equivalent power (NEP) low / no-bandwidth-limit superconductive nanowire single-proton detector as a detection unit and adopting a single-proton counting technology.
Owner:NANJING UNIV
Method and device for generating broadband chaotic signal similar to white noise
ActiveCN103368653AEliminate periodicityWide and flat spectrumElectromagnetic transmittersTime-domain reflectometerFrequency spectrum
A method for generating a broadband chaotic signal similar to white noise comprises the steps that beat frequency is carried out on two paths of chaotic lasers through an optical fiber coupler, the two paths of chaotic lasers are divided into two paths with the equal intensity, balanced detection is carried out on the two paths of optical signals, and a difference value signal is extracted and converted into a corresponding electric signal. A device for generating the broadband chaotic signal similar to the white noise comprises two chaotic laser emission devices, the optical fiber coupler and a balance detector. The optical frequencies of the chaotic laser emission devices are not equal, and an optical frequency difference is the spectral line width of the chaotic lasers. The chaotic signal generated through the method has the wide and flat frequency spectrum similar to that of the white noise, no rectilinear oscillation exists on the frequency spectrum, and periodicity caused when the chaotic lasers are generated through a time delay system can be thoroughly eliminated; the security of chaotic communication, the measurement accuracy of a radar and an optical time domain reflector, and the randomness of physical random numbers are improved. The method and device can be applied to the fields of communication, remote sensing, sensing and the like.
Owner:TAIYUAN UNIV OF TECH
Multifrequency probe light time division multiplexing coherent light time domain reflectometer method and apparatus thereof
InactiveCN102412894AReduce fading noiseImprove dynamic rangeElectromagnetic transmissionTime-domain reflectometerPhysics
The invention provides a method of a multifrequency probe light time division multiplexing coherent light time domain reflectometer. The method is characterized in that: a detection light pulse being injected into a fiber being detected is multifrequency detection light pulse which generates time division multiplexing by utilizing sequential electric signal synchronization control phase modulator and light pulse modulator modulation; local oscillator light is single-frequency light, and power spectrum of the multifrequency detection light pulse is bilaterally symmetrical relative to local oscillator light frequency; 0 order frequency of the multifrequency detection light pulse is same with the local oscillator light frequency; modulation depth of the phase modulator is larger than 1; a backward scattering and / or reflection signal which the multifrequency light pulse of time division multiplexing is in mixes with the local oscillator light in a coherent detection module, both side are coherent and an intermediate frequency signal of time division multiplexing is output by a photoelectric detector; an intermediate frequency signal processing module amplifies an intermediate frequency signal of time division multiplexing detected by coherent detection, according to a characteristic of the intermediate frequency signal, a needed band pass filter is selected, the intermediate frequency signal is filtered, a subsequent circuit carries out real-time processing on a plurality of paths of intermediate frequency signals, and information of the fiber being detected is displayed.
Owner:NANJING UNIV
Method for producing probe pulse and coherent light time-domain reflector
ActiveCN102142892ADoes not cause spectrum broadeningHigh resolutionElectromagnetic transmissionReflectometers detecting back-scattered light in time-domainContinuous lightTime-domain reflectometer
The invention relates to the field of communication transmission, in particular to a method for producing a probe pulse and a coherent light time-domain reflector. The coherent light time-domain reflector comprises a control unit, a drive unit, a continuous light laser and a detection pulse generating unit, wherein the control unit is used for generating a first pulse signal and a second pulse signal with same period T, the second pulse signal is lag behind the first pulse signal, the period T of the first pulse signal and the second pulse signal is not less than t+2L / C; the drive unit is used for generating a frequency change drive signal according to the first pulse signal; the continuous light laser is used for generating continuous light with unchangeable frequency change spectrum width under the drive of the frequency change drive signal; and the detection pulse generating unit is used for modulating the continuous light according to the second pulse signal to generate a detection pulse. The coherent light time-domain reflector provided by the embodiment of the invention has higher optical fiber failure resolution ratio and positioning accuracy.
Owner:HUAWEI TECH CO LTD
Optical fiber characterization measurement systems and methods
ActiveUS10411796B1Multiplex system selection arrangementsReflectometers using simulated back-scatterOptical amplifierElectrical and Electronics engineering
Systems and methods for characterizing an optical fiber performed in part by an optical node in an optical line system include performing one or more measurements to characterize the optical fiber with one or more components at the optical node, wherein the one or more components perform functions during operation of the optical node and are reconfigured to perform the one or measurements independent of the functions; and configuring the optical node for communication over the optical fiber based on the one or more measurements. The one or more components can include any of an Optical Service Channel (OSC), an Optical Time Domain Reflectometer (OTDR), and an optical amplifier. The configuring can include setting a launch power into the optical fiber based on the one or more measurements.
Owner:CIENA
System for testing wiring characteristics
InactiveUS20070001683A1High currentRule out the possibilityFault location by pulse reflection methodsTime domainTime-domain reflectometer
The invention comprises, inter alia, a portable and easy to use tester for troubleshooting and determining the location of wiring intermittence shorts and wiring intermittence opens. The tester can also check the wire ability to carry a load and detect corrosion and bad contacts. Finally, the invention provides a method to apply the characteristics and qualities of a coaxial cable, to a regular, discrete, multi-wire harness. This method will improve the functionality of a conventional Time-Domain Reflectometer (TDR) system that typically can test only two wires at a time, connected to its input. By providing regular wires the characteristics and qualities of a coaxial cable this method will allow the creation of an expansion box that can interface to a conventional TDR system, and increase the number of wires it can test.
Owner:KRIGEL HENRICK YOUVAL
Dual wavelenth optical time domain reflectometer systems and methods embedded in a WDM system
ActiveUS20170294959A1Multiplex system selection arrangementsWavelength-division multiplex systemsFiberTime domain
A dual wavelength Optical Time Domain Reflectometer (OTDR) system, embedded in a network element, includes a first OTDR source for wavelength λ1; a second OTDR source for wavelength λ2; an OTDR measurement subsystem adapted to measure backscatter signals λ1_BACK, λ2_BACK associated with the wavelength λ1 and the wavelength λ2; and one or more ports connecting the first OTDR source, the second OTDR source, and the OTDR measurement subsystem to one or more fiber pairs; wherein wavelength λ1 and wavelength λ2 are each outside of one or more signal bands with traffic-bearing channels, thereby enabling operation in-service with the traffic-bearing channels.
Owner:CIENA
Method for detecting cracks in carbon fiber bicycle frame using embedded optical fiber
InactiveUS7574074B1Improve efficiencyOptical light guidesCycle framesTime-domain reflectometerTime domain
A method for detecting cracks in a carbon fiber bicycle frame using an embedded optical fiber is provided. Optical time-domain reflectometry is employed to detect cracks in a bicycle frame made of carbon fibers intertwining with a single-mode optical fiber. The single-mode optical fiber is thus embedded into the bicycle frame and consolidated with the carbon fibers during a manufacturing process of the bicycle frame. Integration of the single-mode optical fiber, which has a small diameter, low cost and lightweight, into the bicycle frame adds little to a production cost and weight of the bicycle frame. The optical fiber consolidated within the bicycle frame can be connected with an optical time-domain reflectometer for efficiently detecting twists or cracks of the carbon fibers in the bicycle frame, both as a quality check in the manufacturing process and as a safety check after the bicycle frame has been used for some time.
Owner:HUANG AN BIN
Compact optical time domain reflectometer having enhanced accuracy
InactiveUS6594004B1Material analysis by optical meansReflectometers detecting back-scattered light in time-domainTime-domain reflectometerTime domain
A light branching section applies a light pulse emitted in synchronism with a drive pulse (DP), to an optical fiber line path, and receives the light returning from the line path. An A / D converter performs equivalent sampling on the optical signal contained in the returning light, in synchronism with the sampling pulse (SP) of period T0. A measuring control circuit (MCC) generates DP a number (M) of times. The circuit generates N number of SPs every time it outputs DP. It outputs the SPs, at a time delayed by DELTAT that corresponds to 1 / M of the period T0. A clock signal generation circuit outputs to the MCC a first clock signal of a period T1 and a second clock signal of a period T2 different by DELTAt from the period T1. The MCC imparts a delay DELTAT to the SPs, on the basis of the DELTAt.
Owner:ANRITSU CORP
Bi-directional multi-pulsewidth optical time-domain reflectometer
ActiveUS20140198311A1High resolutionWell representedMaterial analysis by optical meansReflectometers detecting back-scattered light in time-domainImage resolutionOptical time-domain reflectometer
There is provided a bi-directional optical reflectometric method for characterizing an optical fiber link. The method comprises: performing a plurality of forward-direction light acquisitions from one end of the optical fiber link and performing a plurality of backward-direction light acquisitions from the opposite end, wherein each light acquisition is performed by propagating at least one test light signal corresponding to given spatial resolution and detecting corresponding return light so as to obtain a reflectometric trace representing backscattered and reflected light as a function of a distance on the optical fiber link, and wherein said plurality of forward-direction light acquisitions and said plurality of backward-direction light acquisitions are each performed with mutually different spatial resolutions; and deriving a value of at least one parameter characterizing an event along said optical fiber link at least using a forward-direction light acquisition and a backward-direction light acquisition performed with mutually different spatial resolutions.
Owner:EXFO
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