Provided is a micro electro-mechanical system (MEMS) sensor including a substrate including a first cavity, a first frame including a second cavity at least partially overlapping the first cavity, at least a portion of the first frame being spaced apart from the substrate, a plurality of resonators, each of the plurality of resonators including a first end connected to the first frame and a second end extending into the second cavity, and a second frame including a first region connected to the first frame and a second region spaced apart from the first frame and connected to the substrate.

Systems, methods, and apparatus for corona detection using audio data are provided. In one example embodiment, the method includes obtaining, by one or more computing devices, audio data indicative of audio associated with an electrical system for at least one time interval. The method includes partitioning, by the one or more computing devices, the audio data for the time interval into a plurality of time windows. The method includes determining, by the one or more computing devices, a signal indicative of a presence of corona based at least in part on audio data collected within an identified time window of the plurality of time windows relative to audio data collected for a remainder of the time interval.

A micro-electro mechanical device includes a casing, a vibration sensor, a vibration membrane assembly, and a micro-electro mechanical microphone. The casing has a sound-receiving hole, and the vibration sensor is disposed in the casing. The vibration membrane assembly is disposed in the casing and corresponds to the vibration sensor. The micro-electro mechanical microphone is disposed in the casing and corresponds to the sound-receiving hole, and a back cavity of the micro-electro mechanical microphone is formed in the casing. The back cavity at least partially overlaps with areas corresponding to a vertical projection of the vibration membrane assembly.

A micro-electro mechanical device includes a casing, a vibration sensor, a vibration membrane assembly, and a micro-electro mechanical microphone. The casing has a sound-receiving hole, and the vibration sensor is disposed in the casing. The vibration membrane assembly is disposed in the casing and corresponds to the vibration sensor. The micro-electro mechanical microphone is disposed in the casing and corresponds to the sound-receiving hole, and a back cavity of the micro-electro mechanical microphone is formed in the casing. The back cavity at least partially overlaps with areas corresponding to a vertical projection of the vibration membrane assembly.

A sonar device includes a support having negative buoyancy and a linear acoustic reception antenna comprising an elongated body that is elongated from a first end to a second end, the elongated body being connected by the first end at a connection point that is fixed relative to the support, the sonar device being able to be in a reception configuration, wherein the antenna body and the support are fully submerged and wherein the antenna body is able to be in a vertical orientation, wherein it extends substantially vertically from the first end to the second end toward the seabed, the sonar device comprising orientation adjustment means for adjusting, when the sonar device is in the reception configuration and the support is fixed relative to the terrestrial reference frame, an angle of elevation and an azimuth of the second end in the reference frame connected to the support centered on the connection point.

A contact vibration detection device 100 for detecting contact vibration due to contact between a rotational shaft 12 and a stationary part 13 includes: a rotation waveform determination unit 101 configured to determine a rotation waveform of the rotational shaft 12 based on displacement of the rotational shaft 12 during rotation; a parameter change detection unit 102 configured to detect a change in a parameter of at least one of an effective value of the rotation waveform or a phase angle of the rotation waveform; and a contact vibration determination unit 103 configured to determine whether the contact vibration occurs based on presence or absence of the change in the parameter.

A diagnostic device includes a reception unit and a determination unit. The reception unit is configured to receive context information and sensing information. The context information corresponds to a certain operation of a target item that constitutes a target device. The context information is a piece of a plurality of pieces of context information each describing an operation of the target item determined depending on a type of operation of the target device. The sensing information is on a physical quantity that varies in accordance with the operation of the target item. The determination unit is configured to determine a state of the target item based on the sensing information detected while the target item is performing the certain operation, and based on a model corresponding to the received context information. The model is a model of one or more models respectively defined for one or more pieces of the context information.

A diagnostic device includes a reception unit and a determination unit. The reception unit is configured to receive context information and sensing information. The context information corresponds to a certain operation of a target item that constitutes a target device. The context information is a piece of a plurality of pieces of context information each describing an operation of the target item determined depending on a type of operation of the target device. The sensing information is on a physical quantity that varies in accordance with the operation of the target item. The determination unit is configured to determine a state of the target item based on the sensing information detected while the target item is performing the certain operation, and based on a model corresponding to the received context information. The model is a model of one or more models respectively defined for one or more pieces of the context information.

The innovation disclosed and claimed herein, in at least one aspect thereof, comprises continuously charging a cell phone while the user utilizes the cellular phone for ordinary activities (e.g. posting to social media sites, texting, talking, etc.). The signals from routine cellular phone operations will send signals to a photocoupler or other dedicated sensor. The dedicated sensor will output current to drive a magnet mechanism which will in turn drive a fan that generates current to charge to a super/ultra-capacitor.

The innovation disclosed and claimed herein, in at least one aspect thereof, comprises continuously charging a cell phone while the user utilizes the cellular phone for ordinary activities (e.g. posting to social media sites, texting, talking, etc.). The signals from routine cellular phone operations will send signals to a photocoupler or other dedicated sensor. The dedicated sensor will output current to drive a magnet mechanism which will in turn drive a fan that generates current to charge to a super/ultra-capacitor.