摘要:
A specific absorption rate measuring system (40), a method thereof, and a biological tissue equivalent phantom unit (1) are disclosed. The biological tissue equivalent phantom unit includes a biological tissue equivalent phantom for absorbing an electromagnetic wave; two or more electro-optical crystals (3) that are arranged at two or more measurement points in the phantom, the electro-optical crystals having a dielectric constant that is approximately equal to that of the phantom; and two or more optical fibers (10) laid in the biological tissue equivalent phantom for optically connecting each of the electro-optical crystals to an external destination. The specific absorption rate measuring system for evaluating absorption of the electromagnetic wave energy using the phantom unit includes a luminous source (4) for irradiating a light; a polarization regulator (7) for adjusting a polarization state of the light that is output by the luminous source; an optical-path switcher (9) for providing the polarization-adjusted light to each of the electro-optical crystals one by one; and a specific absorption rate measuring unit (44) for detecting the light reflected from the electro-optical crystal, and for measuring an absorption rate.
摘要:
An electric field sensor comprising an input optical, an incoming waveguide (5) formed on a substrate (4), two branched waveguides (6) branched from the waveguide (5) on the substrate (4) and having refractive indexes variable depending upon the intensity of the applied electric field; an output wave guide (7) joined with the waveguides (6) on the substrate (4); and a shield member (8) provided near the guides (6) to shield part of the waveguide (6) from electric fields. A reflecting mirror (16) may be formed on the substrate (4) so as to reflect light from the guides (6). The substrate (4) may be formed of a ferroelectric substance, in which the respective regions of the two waveguides (6) are polarized in opposite directions.
摘要:
An electric field sensor equipped with a sensor head (1), package (13) housing the head (1), and an antenna (14) attached to the package (13) and connected to the head (1). The head (1) is composed of a substrate (3) and an optical modulator (4) mounted on the substrate (3). The modulator (4) is provided with an input optical waveguide (5) formed on the substrate (3), two phase-shifting optical waveguides (6) branched from the waveguide (5) on the substrate (3) and having the refractive indexes variable depending upon the intensity of the applied electric field, an output waveguide (7) joined with the waveguides (6) on the substrate (3), and two modulating electrodes (8) formed on or in the vicinity of the waveguides (6). The antenna (14) has two rod antenna elements (17 and 18) which are extended in parallel with the waveguide (6) in the opposite directions from the central part of the package (13). It is possible to fix the antenna (14) to the side face (21) of the package (13) and constitute the antenna (14) of two antenna element film pieces (22 and 23) which are extended in parallel with the guides (6) in the opposite directions from the central part of the side face (21). The antenna element film pieces (17 and 18) can be fixed to the substrate (3). It is also possible to form a plurality of optical modulators on the substrate and connect the antennas, respectively, to the modulators.
摘要:
An optical electric field sensor is constituted of optical parts (2-4 and 11-13) including an optical crystal and it is used to measure the intensity of a naturally or forcibly generated electric field by utilizing such a phenomenon that the intensity, phase, or polarization direction of light changes when the light is passed through the electric field. The optical parts are arranged and enclosed in a package (7) formed of at least one kind of material selected from such a glass material as quartz, ceramics, such a plastic material as antistatic vinyl chloride. When the main surface section of the package (7) is satinized, a greater effect can be obtained. The optical crystal having an electrooptic effect is enclosed in an heat- insulating material. In addition, a conductive resin is applied to the entire surface of the substrate of the optical crystal and a silicon resin is applied between modulating electrodes.
摘要:
An electric field sensor comprising a sensor head (100) that varies the intensity of light transmitted therethrough depending upon the strength of the applied electric field; an optical fiber (8) which leads light from a light source (1) to the head (100); an optical fiber (9) which leads the light transmitted through the head (100) to a photoelectric converter (10); and a measuring instrument (11) which measures and displays electric signals from the converter (10). This sensor detects electromagnetic noise or electromagnetic leakage through changes in intensity of light without bringing the head (100) into contact with a source of electromagnetic noise or leakage, but by positioning the head (10) near the source.
摘要:
Le capteur comprend comme élément sensible un cristal à propriétés électro-optiques, traversé par un faisceau lumineux de directions de propagation et de polarisation déterminées, ce cristal étant taillé sous forme d'un ellipsoïde (14) et présentant une symétrie cristallographique soit uniaxiaLe 622, 422 ou 4 2m, soit cubique 4 3m ou 23, les trois axes perpendiculaires de l'ellipsoïde étant orientés selon trois axes cristallographiques trirectangles de symétrie la plus élevée du cristal. Ce capteur comporte au moins une voie de mesure qui comprend une source de lumière monochromatique (2) émettant un faisceau incident (4), un moyen (6) de polarisation du faisceau incident selon une première direction cristallographique du cristal, des moyens d'introduction (6, 8, 12) du faisceau incident polarisé dans le cristal selon une seconde direction cristallographique, un moyen d'analyse (30) du faisceau lumineux sortant du cristal et un moyen de détection (32) du signal lumineux analysé.
摘要:
In einem interferometrischen faseroptischen Sensor mit Homodyne-Detektion zum Messen elektrischer Felder oder Spannungen erfolgt die Kompensation des Messignals getrennt von der Arbeitspunktkontrolle. Das vom elektrischen Feld herrührende Messignal wird in einem piezoelektrischen Modulator (5) kompensiert, der aus Modulatorelementen besteht, die bezüglich Material, geometrischer Form und Kristallorientierung identisch mit dem mindestens einen Sensorelement (3) sind. Zur Arbeitspunktkontrolle sind zusätzliche, separate Mittel (4) mit einem hinreichend grossen Phasenhub vorgesehen. Modulatorelememt und Sensorelement (3) befinden sich im wesentlichen auf gleicher Temperatur, so dass die Temperaturabhängigkeit der Materialkonstanten des Sensorelements und die Temperaturabhängigkeit des Faserinterferometers eliminiert werden. Vorzugsweise arbeitet der Sensor nach dem Prinzip eines faseroptischen Zwei-Moden-Interferometers.