Use of traceable micro-electro-mechanical systems (“MEMS”) in subterranean formations. A method may comprise introducing a treatment fluid comprising a traceable micro-electro-mechanical system into a wellbore, wherein the traceable micro-electro-mechanical system comprises a micro-electro-mechanical system and a tagging material.

There is provided an untethered, single-bodied pig for inspecting a tubular object. The pig comprises: a plurality of transducer casings (3), each transducer casing (3) including an electrical terminal (13); a plurality of transducers for detecting a condition of the tubular object, each transducer mounted on or in a respective one of the plurality of transducer casings (3); a transducer body defining a plurality of receptacles (12), each transducer casing (3) removably received in a respective one of the plurality of receptacles (12); and a plurality of compressible electrical connectors (14), each compressible electrical connector (14) at least partially arranged inside a respective one of the plurality of receptables (12), wherein each compressible electrical connector (14) is configured to be in electrical contact with the electrical terminal (13) of the transducer casing (3) received in the corresponding receptacle (12).

The present invention provides a wireless temperature and humidity sensor and system, and measurement method. The wireless temperature and humidity sensor comprises a substrate, a feeding network, an antenna and surface acoustic wave resonators, wherein the surface acoustic wave resonators are fed by said feeding network through said antenna. Said surface acoustic wave resonator comprises a reference resonator and measuring resonators. The resonant frequency difference between said reference resonator and said measuring resonators is used to modulate the temperature and/or humidity to be measured. Said system can monitor both temperature and humidity simultaneously, or monitor humidity or temperature selectively. Furthermore, frequency drift caused by aging of the sensor material and the connector is effectively suppressed by the differential modulation, thereby improving long-term stability of measurement and avoiding recalibration.

A method for automatic diagnosis of a mechanical system of a group of mechanical systems sharing mechanical characteristics includes obtaining data relating to a vibration. The vibration-related data is acquired by a portable communications device configured to communicate with a remote processor. The processor automatically diagnoses the mechanical system by applying a relationship to the obtained vibration-related data. The relationship is based on sets of vibration-related data previously obtained from the mechanical systems. Each set of vibration-related data relates to vibrations of a mechanical system. The relationship is further based on sets of operation data previously obtained for mechanical systems of the group. Each set of operation data indicates a previous state of operation of a mechanical system. Each of the previous states of operation is associated with at least one of the previously obtained sets of vibration-related data.

A compressed fluid source assembly may comprise: a pressure cylinder configured to receive a compressed fluid source therein; and a surface acoustic wave (SAW) sensor coupled to an external surface of the pressure cylinder.

An arrangement is provided for detecting a damage of a filter fabric (8) of a disc filter (1) at a disc filter unit comprising disc filters. The arrangement includes a measurement bar (20) that includes two or more microphones (21), a store (45) including stored sound samples, at least one alarming means and a processing arrangement (43) for analyzing online sound or sound samples captured by the microphones (21). The processing arrangement (43) is connected to the microphones (21), the store (45) and the at least one alarming means. A method is also disclosed for detecting a damage of a filter fabric (8) of a disc filter (1) at a disc filter unit.

The invention concerns a system for monitoring physical and/or analogue parameters relative to the parts of an engine, said system comprising at least one electronic control unit (30.sub.a) configured to call up data, via at least one antenna (20a), from a surface acoustic wave sensor located on one of said parts, characterised by the fact that:—the engine (M) is compartmentalized, each compartment (Ma, . . . , Mf) comprising a plurality of mobile or fixed parts of which the physical and/or analogue parameters need to be monitored, —each of these parts to be monitored is provided with a surface acoustic wave sensor (101a, 102a, 103a, . . . , 101f, 102f, 103f), each of said sensors having a distinct resonance frequency specific to it,—an antenna (20a, . . . , 20f) is installed inside each of the compartments (Ma, . . . , Mf), each of said antenna being connected, alone or in pairs, to an electronic control unit (30a, . . . , 30f, 30ab, . . . , 30ef),—each antenna (20a, . . . , 20f) is controlled by the electronic control unit (30a, . . . , 30f, 30ab, . . . , 30ef) to which it is connected, to simultaneously emit a plurality of distinct frequencies close to the resonance frequencies of the sensors (101a, 102a, 103a, . . . , 101f, 102f, 103f) which are located in the engine compartment (Ma, . . . , Mf) of said antenna, so as to simultaneously communicate with all of these sensors (101a, 102a, 103a, . . . , 101f, 102f, 103f).

A gas sensor utilizing carbon nanotubes (CNTs) is disclosed. The sensor can include a patch antenna, a feed line, and a stub line. The stub line can include a carbon nanotube (CNT) thin-film layer for gas detection. The CNTs can be functionalized to detect one or more analytes with specificity designed to detect, for example, environmental air contaminants, hazardous gases, or explosives. The sensor can provide extremely sensitive gas detection by monitoring the shift in resonant frequency of the sensor circuit resulting from the adsorption of the analyte by the CNT thin-film layer. The sensor can be manufactured using inkjet printing technologies to reduce costs. The integration of an efficient antenna on the same substrate as the sensor enables wireless applications of the sensor without additional components, for wireless standoff chemical sensing applications including, for example, defense, industrial monitoring, environmental sensing, automobile exhaust analysis, and healthcare applications.

Non-limiting examples of the present disclosure relate to devices, systems and methods for conducting non-destructive evaluation (NDE) of a wooden specimen, where structural integrity of the wooden specimen is assessed without being compromised. A non-limiting example of a wooden specimen is a wooden utility pole. One or more NDE devices, attached to the wooden specimen, are configured to transmit and/or receive ultrasonic signals to execute NDE of the wooden specimen. An exemplary NDE device may be controlled by another computing device via a data transmission connection. Examples described herein pertain to a variety of coverages that comprise but are not limited to: coverage for a single NDE device; coverage for a system of two or more NDE devices that are utilized to conduct NDE of the wooden specimen; and coverage where one or more NDE devices interface with one or more computing devices to conduct NDE of the wooden specimen.

A self-powered sensor node includes a printed wiring board connected to a patch. The printed wiring board includes a microcontroller, a transceiver, an antenna, and a power management module connected to supply electric power to the microcontroller. The patch comprises a metamaterial substrate and a piezoelectric element adhered to the metamaterial substrate. The piezoelectric element is connected to the power management module and to the microcontroller. The power management module is configured to store electric power received from the piezoelectric element. The microcontroller is configured to selectively convert electrical signals received from the piezoelectric element into sensor data and then command the transceiver to transmit the sensor data via the antenna. The metamaterial substrate has an auxetic kirigami honeycomb structure.