摘要:
The present invention relates to an clinometric optical fiber sensor of the clinometric tube type and dedicated to the measurement of displacement of sloped soils, the sensor comprises a tube (3) made of plastic material and at least three optical fibers (53), said three optical fibers (53) being arranged along the longitudinal axis of the tube (3) in an equidistant arrangement with respect to the other, and it is characterized in that a fourth optical fiber (53) it is inserted into the wall of the tube (3) but it is installed so as not to transmit deformations and being responsible for the measurement of the temperature profile; and within the tube there is a series of biaxial digital slant (slope) sensors (30), said slant sensors being arranged at equidistant intervals on from the other, and said slant sensors being provided with an electronic compass. It is also the object of the present invention to provide a process for the making of the present clinometric sensor.
摘要:
A hub for an optical shape sensing reference includes a hub body (606) configured to receive an elongated flexible instrument (622) with a shape sensing system coupled to the flexible instrument within a path formed in the hub body. A profile (630) is formed in the hub body in the path to impart a hub template configured to distinguish a portion of the elongated flexible instrument within the hub in shape sensing data. An attachment mechanism (616) is formed on the hub body to detachably connect the hub body to a deployable instrument such that a change in a position of the hub body indicates a corresponding change in the deployable device.
摘要:
Es wird eine Einspannvorrichtung (300) für einen Lichtleiter (112) bereitgestellt. Die Einspannvorrichtung (300) beinhaltet eine Trägerstruktur, welche ein erstes Befestigungselement (301) zur Befestigung des Lichtleiters (112) an einer ersten Position (401) und ein von dem ersten Befestigungselement (301) beabstandetes zweites Befestigungselement (302) zur Befestigung des Lichtleiters (112) an einer zweiten Position (401) aufweist, wobei die ersten und zweiten Positionen (401, 402) einen ersten Abstand (403) in einer Längserstreckung des Lichtleiters (112) aufweisen. Ferner ist ein Zwischenträger (500) mit einer ersten Fläche (503), auf welchem die ersten und zweiten Befestigungselemente (301, 302) an jeweiligen Befestigungspositionen (501, 502) angebracht sind, und einer gegenüberliegenden zweiten Fläche (504) bereitgestellt, welche an einem Messobjekt anbringbar ist. Hierbei ist ein zweiter Abstand (505 ) der Befestigungspositionen (501, 502) der Befestigungselemente (301, 302) auf dem Zwischenträger (500) in einer Längsrichtung des Lichtleiters (112) größer ist als der erste Abstand (403).
摘要:
A sensor system (10) and method for monitoring a powertrain (20) having a drive shaft (1). The sensor system (10) comprises an optical fibre (2) with a strain sensitive element (3). According to one aspect, a connection structure (4) is configured to hold at least a part of the optical fibre (2) with the strain sensitive element (3) at a radial distance (R2-R1) remote from the drive shaft (1) for amplifying the strain (S2) on the strain sensitive element (3) with respect to the strain (S1) on the drive shaft (1). According to a further aspect, at least three respective lengths of one or more optical fibres follow parallel, e.g. helical, paths with respect to each other to distinguish different strain forces.
摘要:
Apparatus for measuring the distribution of strain and temperature along an optical fibre (34) by analysing the distribution of the Rayleigh scattering and stimulated Brillouin scattering wavelength shifts along the length of a sensing fibre (34) using a Wavelength-Scanning Optical Frequency-Domain Analysis (WS-BOFDA) technique in which a wavelength-swept laser (12) sources a Brillouin "pump" radiation and excites a Brillouin ring laser (14) that sources a Brillouin "stimulus" radiation with wavelength shifted with respect to the excitation of a tuneable quantity. One optical Mach Zehnder or Michelson interferometer (27) is excited by the "stimulus" radiation on both the measurement arm, that comprises the sensing fibre (34), and the reference arm (38) while the "pump" radiation is injected only in the measurement arm by a controllable inhibition system (57). The output of the interferometer (27) is analysed in the frequency domain differential detectors (73, 74) sweeping the wavelength of the pump laser (12) and of the wavelength shift of the Brillouin laser (14). The invented apparatus does not require electro-optical modulators, phase-locking, high power optical amplifiers or microwave electronics and overcomes the prior art issues on manufacturing cost, stability, spatial resolution and on separate measurement of strain and temperature on the same sensor.
摘要:
The present invention concerns a Brillouin optical distributed sensing method, comprising steps of (i) providing an optical pulsed pump wave (41) at a pump frequency, (ii) providing a first and a second optical probe wave (44, 45) respectively at a first and a second probe frequency, (iii) detecting a stimulated Brillouin scattering signal resulting from the respective interactions in a sensing optical fiber of the first and the second optical probe waves (44, 45) with the optical pulsed pump wave (41), wherein the first and the second optical probe wave (44, 45) are respectively spectrally located within the Stokes and the anti-Stokes Brillouin spectra (42, 43) of the optical pulsed pump wave (41), and the average probe frequency corresponding to an average value of the first and the second probe frequencies is different but close to within a half spectral width of the Stokes or the anti-Stokes Brillouin spectrum (42, 43) from the pump frequency. The present invention concerns also a device for implementing the method.
摘要:
An optical shape sensing system and method with at least two optical fibers (OSF1, OSF2) both comprising optical shape sensing elements. A processor (P) is arranged to register a coordinate system indicative of a position of one of the optical fibers (OSF1) in space, and to register a position (R2) of the other optical fiber (OSF2) in relation to this coordinate system. An optical console system (C, C1, C2) serves to interrogate the optical shape sensing elements in both optical fibers (OSF1, OSF2), and to accordingly determine a measure of a three-dimensional shape (I) of both optical fibers (OSF1, OSF2), based on the registered position (R2) of the second optical fiber (OSF2) in relation to the coordinate system. This provide the possibility of providing 3D optical shape sensing of the length of both optical fibers (OSF1, OSF2), thus allowing 3D shape reconstruction of e.g. long medical devices with lengths of several meters. More than two shape sensing optical fibers, e.g. incorporated in separate devices, can be registered in this manner in a hierarchical data structure, thus allowing shape sensing of very long instruments.
摘要:
A sensor assembly comprises a clamping ring for clamping engagement of a shaft or bearing and an optical fibre. The clamping ring has an inner surface for engagement with an outer surface of the shaft or bearing and a groove around a circumference of the inner surface. The optical fibre is retained within the groove and extends from the groove for connection to an interrogation unit. The optical fibre may be a fibre Bragg grating sensor.
摘要:
L'invention concerne un dispositif de mesure (100) de déformation le long d'au moins une première fibre optique (10). Un tel dispositif de mesure (100) comporte la première fibre optique (10) et un système optique (20) relié optiquement à la première fibre optique (10) et adapté pour faire une mesure selon le principe de la mesure Brillouin afin de déterminer la déformation le long de la première fibre optique (10). La première fibre optique (10) comporte un cœur de fibre avec une proportion molaire en alumine d'au moins 6%. L'invention concerne également l'utilisation d'une telle première fibre optique pour mesurer les déformations et un procédé de mesure de déformation.
摘要:
A calibration system for optical fiber shape sensing includes a temperature control fixture (140) including a plurality of segments(142), each segment being independently temperature controlled using one or more temperature control devices(144). A processor (114) and memory (116) coupled to the processor are included. An optical shape sensing module (115) is configured to interrogate and receive feedback from an optical shape sensing (OSS) instrument (104) wherein OSS data is collected by deploying the OSS instrument in or on the temperature control fixture to gather OSS data in accordance with a plurality of temperature conditions such that the OSS data is employed as calibration data for use during operation of the OSS instrument to reduce instability and jitter.