Abstract:
A caliper-arm-position sensor comprising a differential variable reluctance transducer (DVRT) and circuits to drive the DVRT with a substantially sinusoidal signal and to sample a signal at the DVRT once per drive-signal cycle at a predetermined position in the drive-signal cycle is disclosed.
Abstract:
Provided are devices for density measurement of an underground region or other region of interest, including: a Vanadium-48 (V-48) radioactive isotope-based gamma ray source, and a gamma ray detector. Further, a method for density measurement is provided, said method including: inserting a density measurement device having a V-48 radioactive isotope-based gamma ray source, and a gamma ray detector, into a well, pipe, casing, or other access accessing the region of interest; emitting gamma rays from the V-48 gamma ray source into the region; collecting density information for the region by detecting, at the gamma ray detector, gamma rays returning from the region back to the gamma ray detector; and using the collected information to provide density information of the region. Also provided are V-48-based gamma ray sources, for use in devices and methods for density measurement. Transport containers for transporting radioactive sources, and methods and uses thereof, are also provided.
Abstract:
A measurement device includes a probe having a first conductive surface, a second conductive surface, and an insulating layer. The second conductive surface is opposite the first conductive surface and fixed relative to the first conductive surface. The insulating layer is positioned between the first conductive surface and second conductive surface and electrically insulates the first conductive surface from the second conductive surface.
Abstract:
Die Erfindung betrifft eine Messvorrichtung (1) zum Messen der Geometrie eines hohlzylindrischen Objektes (2). Die Messvorrichtung (1) umfasst zumindest drei innenliegende Messtaster (7) mit außen angeordneten Abtastflächen (8) zum Anlegen an eine Innenwandfläche (3) des hohlzylindrischen Objektes (2) und zumindest drei außenliegende Messtaster (9) mit innen angeordneten Abtastflächen (10) zum Anlegen an eine Außenwandfläche (4) des hohlzylindrischen Objektes (2). Einem der innenliegenden Messtaster (7) ist jeweils einer der außenliegenden Messtaster (9) zugehörig.
Abstract:
Measuring assembly with a measuring apparatus and a recognition system, and recognition method to detect the correct positioning of a removable device such as a comparator to check the shape and / or dimensions of a mechanical part with respect to a stationary part that includes at least one mechanical reference for the removable device. The system comprises a field source disposed in the stationary part that generates a field and a matching element disposed on the removable device that is able to alter the propagation of this field if correctly positioned relative to the field source. A sensor fixed to the stationary part in an appropriate position detects or not the field and generates a resulting detection signal detection or non-detection signal. A processing unit receives the signal generated by the sensor and on the basis of this provides information about the correct or incorrect positioning of the removable device with respect to the stationary part. The recognition system can be of the magnetic or optical type.
Abstract:
Le capteur (23) est posé sur un plateau (22) descendu dans le creux de l'arbre (5) et guidé par des fils tendus (11) entre un dispositif d'accrochage inférieur et un enrouleur à moteur (12, 18) supérieur. Les déformations, responsables d'erreurs de mesure et dues soit à des déformations statiques, produites par le poids ou une mauvaise construction de l'appareillage, soit par des vibrations, sont dans une large mesure éliminées.
Abstract:
A downhole tool for measuring a diameter within a borehole includes a mandrel having a first end and a second end with an axis defined therethrough, A tapered surface is formed on an outside surface of the mandrel such that a first end of the tapered surface has a larger diameter than a second end of the tapered surface. The downhole tool further includes a collet disposed about the mandrel such that the collet is configured to move along the axis of the mandrel with respect to the mandrel in a direction from the first end of the mandrel to the second end of the mandrel. A method of measuring a diameter within, a borehole, using a downhole tool including a mandrel having a first end, a second end, and an axis defined therethrough; and a collet disposed about the mandrel, the method includes: disposing the downhole tool into the borehole such that the first end of the mandrel enters the borehole before the second end of the mandrel; and applying a force to the second end of the downhole tool, upon the downhole tool contacting an obstruction in the borehole. Based on the force applied to the downhole tool, the collet moves along the axis of the mandrel with respect to the mandrel such that an outer diameter of the downhole tool decreases. A method of manufacturing a downhole tool for measuring a diameter within a borehole includes providing a mandrel having a first end and a second end with an axis defined therethrough, forming a tapered surface on an outside surface of the mandrel such that a first end of the tapered surface has a larger diameter than a second end of the tapered surface; and disposing a collet about the mandrel such that the collet is configured to move along the axis of the mandrel with respect to the mandrel in a direction from the first end of the mandrel to the second end of the mandrel.