A passive carbon nanotube transducer is provided. The passive carbon nanotube transducer includes shells as protective walls for the top and bottom housing of the transducer with carbon nanotube sheets affixed between the shells. The shells act as acoustic windows that match the surrounding acoustic medium. A gasket encloses the shells and carbon nanotube sheets of the transducer. Each carbon nanotube sheet has an electrode at both ends. Multiple carbon nanotube sheets are capable of sensing sound induced environment temperature deviations and converting electric voltage or current for passive acoustic detection.

One embodiment includes an optical microphone system. The system includes a laser configured to emit an optical beam at a linear polarization and an optical cavity system comprising a membranous mirror that is configured to reflect the optical beam and to vibrate in response to an acoustic input signal. The optical cavity system includes at least one photodetector configured to receive at least a portion of the optical beam to generate a microphone signal that is indicative of the vibration of the membranous mirror resulting from the acoustic input signal based on the reflection of the optical beam. The system further includes an acoustic processor configured to process the microphone signal to calculate a frequency of the acoustic input signal.

A display panel and manufacturing method thereof, and a display device and health monitoring method thereof. The display panel includes a base substrate and a sonic sensor disposed on the base substrate. The sonic sensor is configured to monitor a sonic wave.

A display apparatus includes a display, a loudspeaker and a controller. The controller is configured to: perform, based on one or both of (i) image information of an image that is displayed on the display, and (ii) sound information of sound that is output from the loudspeaker, electric current control processing that controls a sum of an electric current to be supplied to the display and an electric current to be supplied to the loudspeaker.

A display apparatus includes a display, a loudspeaker and a controller. The controller is configured to: perform, based on one or both of (i) image information of an image that is displayed on the display, and (ii) sound information of sound that is output from the loudspeaker, electric current control processing that controls a sum of an electric current to be supplied to the display and an electric current to be supplied to the loudspeaker.

Recording, manipulating, distributing and creating sound pressure waves in one or more media by employing an apparatus that transfers the energy between photons and particles of the media is disclosed. An exemplary apparatus comprises one or more lasers and an isotropic or anisotropic medium for photon processing and distribution. An exemplary method comprises determining the target locations for sound pressure wave recording, manipulating or creation; transmitting photons to the target locations; transferring photon energy to media particles to create or manipulate a sound pressure wave; or transferring energy of media particles to photons for recording or manipulating a sound pressure wave.

A personnel monitoring system. The personnel monitoring system includes a host node having an optical source for generating optical signals, and an optical receiver. The personnel monitoring system also includes a plurality of fiber optic sensors for converting at least one of vibrational and acoustical energy to optical intensity information, each of the fiber optic sensors having: (1) at least one length of optical fiber configured to sense at least one of vibrational and acoustical energy; (2) a reflector at an end of the at least one length of optical fiber; and (3) a field node for receiving optical signals from the host node, the field node transmitting optical signals along the at least one length of optical fiber, receiving optical signals back from the at least one length of optical fiber, and transmitting optical signals to the optical receiver of the host node.

According to an embodiment, a microfabricated structure includes a cavity disposed in a substrate, a first clamping layer overlying the substrate, a deflectable membrane overlying the first clamping layer, and a second clamping layer overlying the deflectable membrane. A portion of the second clamping layer overlaps the cavity.

According to an embodiment, a microfabricated structure includes a cavity disposed in a substrate, a first clamping layer overlying the substrate, a deflectable membrane overlying the first clamping layer, and a second clamping layer overlying the deflectable membrane. A portion of the second clamping layer overlaps the cavity.

A microphone array for detecting acoustic emissions generated by equipment. The array includes at least one grid having a plurality of sensors each including a compact arrangement of optical fiber having first and second optical fiber ends wherein the first optical fiber end of a first sensor is terminated. The array also includes an optoelectronic device coupled to a second optical fiber end of a second sensor, wherein the optoelectronic device generates laser light that is transmitted through the plurality of sensors in the grid and is reflected back to the optoelectronic device to enable detection of acoustic emissions.