An apparatus for measuring the thickness of graphene oxide coatings deposited on a support substrate are described. The apparatus includes a light source and a photodetector which can be placed directly into a coating line to provide continuous feedback on the thickness of a fabricated graphene oxide coating, enabling fabrication of controlled thickness coatings and real-time quality monitoring.

An accurate and stable displacement sensor that reads through coated metal substrates achieves better than one micron accuracy includes: an electromagnetic coil positioned in a first enclosure; (ii) means for generating a magnetic field from the electromagnetic coil; (iii) a second enclosure which is spaced apart from the first enclosure, wherein the second enclosure includes dual magnetic sensors, such as fluxgate sensors, that are configured to measure the magnetic field; and (iv) means for calculating the separation between the operative surfaces of the enclosures from magnetic field measurements. A permanent magnet can be used instead of the electromagnetic coil and associated driving energy source. A precise displacement measurement is given by a mathematical function (such as the ratio or difference) of the two magnetic sensors demodulated signals. The displacement sensor can be mounted on a maneuverable C-frame to monitor the caliper of anodes and cathodes produced for lithium ion batteries.

Non-contacting caliper measurements of free-standing sheets detect mid-IR interferometric fringes created by the reflection of light from the top and bottom surfaces of the sheet. The technique includes directing a laser beam at a selected angle of incidence onto a single spot on the exposed outer surface and scanning the laser beam through a selected wavelength range as the laser beam is directed onto the exposed outer surface and measuring the intensity of an interference pattern that forms from the superposition of radiation that is reflected from the exposed outer surface and from the inner surface. Alternatively, the intensity of an interference pattern formed from the superposition of radiation that is directly transmitted through the web and radiation that is transmitted through the web after internal reflections from the internal surfaces of the web. Thickness can be extracted from the fringe separation in the interference pattern.

A device is proposed for the contactless three-dimensional inspection of a blade (5) for a turbomachine, comprising: means for scanning the teeth, comprising at least one first pair of laser measurement modules (2A, 2B) and means for the rotational driving, about the main axis, of the blade relative to the modules along the main axis of the blade; means for the rebuilding of a three-dimensional virtual representation of the blade using data coming from said scanning means; means of dimensional inspection using the three-dimensional representation; each pair of modules comprising a first module (2A) oriented towards a first face of a tooth and a second module oriented towards a second face of a tooth;
the modules being oriented relative to the blade so that during a rotation of the blade about the main axis, the scanning means scan the first and second faces of the blade on the entire rim of said blade, and so that during a translation of the blade along the main axis, said scanning means scan the first and second faces of the blade throughout their height.

The detection unit includes a first contact member, which comes into contact with a first surface of a recording material and a second contact member, which comes into contact with a second surface of the recording material, the first contact member and the second contact member being disposed so as to oppose each other thus being capable of nipping the recording material, and the first contact member and the second contact member are movable in a direction in which the first contact member and the second contact member nip the recording material, and is rotatable about an axis line extending in a predetermined direction, the predetermined direction being orthogonal to the direction in which the first contact member and the second contact member are movable and being orthogonal to a conveyance direction of the recording material.

A method of non-contact measurement of a thickness (d) of an object of an electrically conductive material by means of a Pulsed Eddy Current, PEC, system including a transmitter coil and a receiver coil. The method includes, after having turned off a current in the transmitter coil, at the receiver coil, measuring a voltage induced by the decaying magnetic field at a first time point, a second time point, and a third time point. The method also includes calculating a total magnetic flux which is generated by the eddy currents in the object at the first time point and picked up by the receiver coil, by comparing the measured flux at the first time point with a predetermined total flux picked up by the receiver coil when no object is present. The method also includes normalizing measured magnetic flux resulting from the eddy currents and picked up by the receiver coil, using the calculated total magnetic flux as a normalization factor such that the normalized eddy current flux is independent of a distance between the object and the transmitter and receiver coils. The method also including, based on the measurements at the first, second and third time points, determining the thickness and the resistivity of the object.

The present subject matter at least provides an apparatus for characterization of a slab of a material. The apparatus comprises two or more frequency-domain optical-coherence tomography (FD-OCT) probes configured for irradiating the slab of material, and detecting radiation reflected from the slab of material or transmitted there-through. Further, a centralized actuation-mechanism is connected to the OCT probes for simultaneously actuating elements in each of the OCT probes to cause a synchronized detection of the radiation from the slab of material. A spectral-analysis module is provided for analyzing at least an interference pattern with respect to each of the OCT probes to thereby determine at least one of thickness and topography of the slab of the material. Further, in some embodiments, the slab of material may include a passivation layer. The apparatus may be configured to determine a thickness of the passivation layer.

An accurate and stable displacement sensor that reads through coated metal substrates achieves better than one micron accuracy includes: an electromagnetic coil positioned in a first enclosure; (ii) means for generating a magnetic field from the electromagnetic coil; (iii) a second enclosure which is spaced apart from the first enclosure, wherein the second enclosure includes dual magnetic sensors, such as fluxgate sensors, that are configured to measure the magnetic field; and (iv) means for calculating the separation between the operative surfaces of the enclosures from magnetic field measurements. A permanent magnet can be used instead of the electromagnetic coil and associated driving energy source. A precise displacement measurement is given by a mathematical function (such as the ratio or difference) of the two magnetic sensors demodulated signals. The displacement sensor can be mounted on a maneuverable C-frame to monitor the caliper of anodes and cathodes produced for lithium ion batteries.

A device is proposed for the contactless three-dimensional inspection of a blade (5) for a turbomachine, comprising: means for scanning the teeth, comprising at least one first pair of laser measurement modules (2A, 2B) and means for the rotational driving, about the main axis, of the blade relative to the modules along the main axis of the blade; means for the rebuilding of a three-dimensional virtual representation of the blade using data coming from said scanning means; means of dimensional inspection using the three-dimensional representation; each pair of modules comprising a first module (2A) oriented towards a first face of a tooth and a second module oriented towards a second face of a tooth;
the modules being oriented relative to the blade so that during a rotation of the blade about the main axis, the scanning means scan the first and second faces of the blade on the entire rim of said blade, and so that during a translation of the blade along the main axis, said scanning means scan the first and second faces of the blade throughout their height.

An inspection device for contactless three-dimensional inspection of a blade for a turbomachine. The device includes at least one first pair of laser measurement modules to scan the blade and a rotational drive to rotate, about the main axis, the blade relative to the modules along the main axis of the blade. The device then rebuilds a three-dimensional virtual representation of the blade using data coming from the scan and performs a dimensional inspection using the three-dimensional representation. Each pair of modules includes a first module oriented towards a first face of the blade and a second module oriented towards a second face of the blade. The modules are oriented relative to the blade so that during rotation, the modules scan the faces of the blade on the entire rim of the blade, and during translation of the blade along the main axis, the faces are scanned throughout their height.