107 results about "Fibre optic sensors" patented technology

This invention provides a method for controlling production operations using fiber optic devices. An optical fiber carrying fiber-optic sensors is deployed downhole to provide information about downhole conditions. Parameters related to the chemicals being used for surface treatments are measured in real time and on-line, and these measured parameters are used to control the dosage of chemicals into the surface treatment system. The information is also used to control downhole devices that may be a packer, choke, sliding sleeve, perforating device, flow control valve, completion device, an anchor or any other device. Provision is also made for control of secondary recovery operations online using the downhole sensors to monitor the reservoir conditions. The present invention also provides a method of generating motive power in a wellbore utilizing optical energy. This can be done directly or indirectly, e.g., by first producing electrical energy that is then converted to another form of energy.

Refractive index modifications such as e.g. Fiber Bragg gratings in micro-structured Fiber are according to an aspect of the invention fabricated by first filling and / or purging the holes of the micro-structured fiber with inert gas or by evacuation and, optionally subsequently scaling the ends. Alternatively, the ends of the micro-structured fiber may be sealed without a preceding purging or evacuation of the holes. In this way hydrogen or deuterium present in the holes after photosensitizing loading will not react with atmospheric oxygen to form water. Water formed this way would otherwise seriously impair the grating formation process. Bragg gratings and other refractive index structures can thus be fabricated with high quality and predictable specifications in micro-structured fiber. Sealing the fiber ends also prevents in-diffusion of moisture. The invention may e.g. find application in connection with fiber optical sensors, high-power fiber lasers, etc.

The invention provides a phase generator carrier (PGC) digital demodulation method for an interferometric fiber optic sensor and a device thereof. The PGC digital demodulation method for the interferometric fiber optic sensor comprises the following steps: outputting interference light intensity signals including sensing signals phi(t), and carrier signals by adopting the PGC technique; performing discrete sampling on the interference light intensity signals in the whole observation time T to obtain time domain sequence signals of the interference light intensity signals; by taking a carrier fundamental frequency cycle Tc as a unit, dividing the T into a plurality of time slots, and performing discrete Fourier transformation (DFT) on the time domain sequence signals in all the slots Tc to obtain the frequency spectrums of the time domain sequence signals; performing inverse discrete Fourier transformation (IDFT) on the frequency spectrums to reconstruct corresponding time domain signals; and according to the relation between the harmonic amplitudes of the reconstructed signals and the harmonic amplitudes of continuous signals, calculating the in-phase components cosphi(t) and the quadrature components sinphi(t) of the sensing signals phi(t) in all carrier cycles Tc, and performing the calculation slot by slot until the cosphi(t), sinphi(t) and the sensing signals phi(t) in the whole observation time T are obtained, and signal PGC demodulation is realized by the digital technology. A mixing system is not adopted, a local oscillation signal is not needed, and the problems, such as carrier signal synchronization and the like do not exist, and the overall performance is better.

The invention relates to a mobile phone audio interface-based visible light close communication system and method. The system comprises a transmitting terminal of a mobile phone with an external LED (light emitting diode) module and an installed encoding module, and a receiving terminal with a light ray sensor, a decoding module and application software, wherein the LED module is connected to the audio interface of the smart mobile phone; the encoding module packages and encodes original data, modulates an audio signal by using the encoded data and transmits to the LED module, and the audio signal is changed into a visible light signal to be sent; the light ray sensor receives the visible light signal and transforms the visible light signal into an electric signal, and data packets are acquired by decoding via the decoding module; whether data in each data packet can pass CRC (cyclic redundancy check) or not is judged, and if so, the decoded data are transmitted to the application software to be processed. Transforming hardware of mobile equipment is not needed, visible light close communication can be realized by the external LED module, and the system and the method can be widely applied in near field communication application scenes such as mobile payment, equipment pairing and data exchange between mobile phone users.

An optical detection system. The optical detection system includes a host node having (a) an optical source for generating optical signals, and (b) an optical receiver. The optical detection system also includes a plurality of fiber optic sensors for converting at least one of vibrational and acoustical energy to optical intensity information, each of the fiber optic sensors having: (1) at least one length of optical fiber configured to sense at least one of vibrational and acoustical energy; (2) a reflector at an end of the at least one length of optical fiber; and (3) a field node for receiving optical signals from the host node, the field node transmitting optical signals along the at least one length of optical fiber, receiving optical signals back from the at least one length of optical fiber, and transmitting optical signals to the optical receiver of the host node.

A personnel monitoring system. The personnel monitoring system includes a host node having an optical source for generating optical signals, and an optical receiver. The personnel monitoring system also includes a plurality of fiber optic sensors for converting at least one of vibrational and acoustical energy to optical intensity information, each of the fiber optic sensors having: (1) at least one length of optical fiber configured to sense at least one of vibrational and acoustical energy; (2) a reflector at an end of the at least one length of optical fiber; and (3) a field node for receiving optical signals from the host node, the field node transmitting optical signals along the at least one length of optical fiber, receiving optical signals back from the at least one length of optical fiber, and transmitting optical signals to the optical receiver of the host node.

A fiber optic transducer is provided. The fiber optic transducer includes a fixed portion configured to be secured to a body of interest, a moveable portion having a range of motion with respect to the fixed portion, a spring positioned between the fixed portion and the moveable portion, and a length of fiber wound between the fixed portion and the moveable portion. The length of fiber spans the spring. The fiber optic transducer also includes a mass engaged with the moveable portion. In one disclosed aspect of the transducer, the mass envelopes the moveable portion.

The disclosed invention discloses the use of a sensor read out system with at least one fiber optical sensor (50), which is connected via at least one signal line (51) to a processing unit (52) as part of an additive manufacturing setup, for in situ and real time quality control of a running additive manufacturing process, wherein acoustic emission is measured via the at least one fiber optical sensor (50) in form of fibers with Bragg grating, fibre interferometer or Fabry-Perot structure (500), followed by a signal transfer (51) and an analysis of the measured signals in the processing unit (52), estimation of the sintering or melting process quality due to correlation between sintering or melting quality and measured acoustic emission signals and subsequent adaption of ion and electron beams, microwave or laser sintering or melting parameters of a ion and electron beams, microwave or laser electronics (1) of the additive manufacturing setup in real times via a feedback loop (53) as aresult of the measured acoustic emission signals after interpretation with an algorithmic framework in the processing unit (52).

The invention relates to a method (200) for the functional testing of a fibre-optic sensor (110). The method (200) comprises receiving (220) optical sensor signals of the fibre-optic sensor (110) in an evaluation unit (124), determining (230) a first variable from the optical sensor signals, determining (240) whether the first variable lies within a pre-determined range, determining (250) a malfunction of the fibre-optic sensor (110) if the first variable lies outside the pre-determined range, and determining (260) a second variable from the optical sensor signals, which is different from thefirst variable, if it is determined that the first variable lies within the pre-determined range, the second variable declaring a parameter that is to be determined by the fibre-optic sensor (110).

The invention discloses a production line for printing paint on a metal sheet material. The production line comprises a metal plate unreeling mechanism (1), an ash wiping device, a left suction box (2), an automatic printing device (3), a right suction box (4), a traction mechanism, a paint drying device (5) and a finished product reeling mechanism (6), which are arranged in sequence from left to right; an optical fiber sensor (22) is mounted at the lower part of a screen mesh plate (21) and is located at the center of the screen mesh plate (21); the traction mechanism is composed of a rack (23), a fixed shaft (24), a rolling shaft (25) which is rotatably mounted in the rack (23) and a motor (26) connected with the rolling shaft (25); the fixed shaft (24) is arranged on the rack (23) and is arranged above the rolling shaft (25); and the paint drying device (5) is internally provided with a conveyor belt. The production line for printing the paint on the metal sheet material has the beneficial effects that continuous printing of the paint is realized, the paint can be accurately printed on a specified position of the metal sheet material, and the automation degree is high.

A method for measuring a response from an optical fiber providing distributed back reflections using a system comprising an optical source comprising a laser, an optical receiver and a processing unit is disclosed. The method comprises establishing initial parameters of a distributed back-reflection processing. The method also comprises generating an interrogation signal and an optical local oscillator using the optical source, the interrogation signal being represented by an interrogation phasor and the optical local oscillator being represented by a local oscillator phasor; transmitting the interrogation signal into the optical fiber; and mixing the optical local oscillator with reflected light from the optical fiber and detecting a mixing product with the optical receiver to achieve a receiver output signal. The method further comprises performing a measurement that characterizes the interrogation phasor; updating the parameters of the distributed back-reflection processing based on the measurement result such that an effect of fluctuations in the interrogation phasor on the measured response from the fiber is reduced; and applying distributed back-reflection processing to the receiver output signal. Finally, the method comprises extracting the response from the optical fiber from the distributed back-reflection processing output. A system for measuring a response from an optical fiber providing distributed back reflections is also disclosed.

A fiber optic sensor employs at least two flexural discs that are spaced apart from one another along a central axis. A fiber optic coil is affixed to at least one of the flexural discs. A proof mass is disposed between the flexural discs. A first stop member is disposed between the proof mass and one flexural disc. A second stop member is disposed between the proof mass and the other flexural disc. The first and second stop members are sized to provide space between the proof mass and the corresponding flexural disc to allow for normal motion of the flexural discs, while interfering with movement of the flexural discs to prohibit unwanted extreme motion. The fiber optic sensor can be used for OTDR measurements of acceleration for real-time oilfield monitoring applications as well as other fiber-based interferometric measurement applications. A coupling structure preferably couples the outer edges of the flexible disks, the mass being attached to the coupling structure.

Fiber optic sensors employ a high brightness light source such as a fiber optic supercontinuum source, multiplexed superluminescent light emitting diodes, or a broadband tunable laser diode. Light is delivered to the measurement location via fiber optics and sensor optics directs infrared radiation onto material the being monitored that is located in a hostile environment. A disperse element is positioned in the detection beam path in order to separate the wavelengths and to perform spectral analysis. A spectral analysis of the radiation that emerges from the sheet yields information on a plurality of parameters for the material. For papermaking applications, the moisture level, temperature and cellulose content in the paper can be obtained.

The invention provides an underwater pipeline detection device based on a fiber laser. The underwater pipeline detection device comprises a body and a control system, flanges are symmetrically arranged on the two sides of the body, and through holes are formed in the flanges. A storage box is fixedly installed at the bottom of the body, a fiber optic receiver and a fiber optic emitter are symmetrically installed on the two sides of the top of the storage box, a fiber optic sensor is fixedly installed on one side of the fiber optic receiver, and a fiber optic is fixedly installed between the fiber optic emitter and the fiber optic receiver. According to the underwater pipeline detection device based on the fiber laser, the service life of a small engine is prolonged, data detected for multiple times are compared, whether oil and gas leakage happening to a certain segment of a pipeline or not can be determined, the operation is simple and convenient, the positioning is accurate, and through the fiber optic sensor outside the body, the situation that the pipeline is damaged due to reduced soil on the periphery of the pipeline and the environment is polluted due to the oil and gas leakage is prevented.

The invention relates to a device and a method for detecting distribution image of each substance in fluid. The existing device has complex structure and low precision. The invention comprises a detection ring and eight sensing units, wherein, a detection stand on the outer side wall of the detection ring can rotate opposite to the detection ring; eight groups of placing slots are distributed on the upper end surface of the detection stand, and each group contains seven placing slots; each sensing unit comprises seven collimators, the middle collimator is connected with the single port of a Y-shaped shunt, and double ports are respectively connected with a laser and a detector; and three adjacent collimators on two sides are respectively connected with three lasers and three detectors. When being detected, the detection ring is installed on a pipeline to be detected; fluid to be detected flows through the detection ring, and a data acquisition card collects to obtain 32 electrical signals; the detection stand rotates for 45 degrees, then the electrical signals are collected again, and the distribution image is obtained by processing. The invention adopts a rotary scanning method to use fewer fiber optic sensor units to obtain higher image reconstruction resolution by independently designing pixels and planar optical circuit structure.