An apparatus, product monitoring system, and a method of measuring an amount of product on a roller are provided. The method includes receiving a first position distance between a position sensor and an exterior edge of the roller. The method also includes comparing the first position distance with a predetermined position distance. The predetermined position distance defines the distance between the position sensor and the exterior edge of the roller at a specific amount of product left on the roller. The method further includes determining the amount of product left on the roller based on the comparison of the first position distance and the predetermined position distance. The method still further includes causing the transmission of a signal relating to the amount of product left on the roller.

A deployment module according to the present application enables both compact stowage of a sensor array and expansion of the sensor array into a three-dimensional volumetric array shape that enables improved directionality of the sensors during operation. The deployment module includes a support shell that is configured to retain a cable of the sensor array separately from sensors of the sensor array and an expandable deployment body formed of a superelastic shape memory alloy that uses superelasticity and stored energy for deployment of the sensor array. During deployment, the deployment body is removed from the support shell and the sensors are subsequently pulled out of the support shell. The deployment body then expands and holds the cable to retain the three-dimensional volumetric shape of the deployed array.

According to examples, systems, devices, and methods for detecting rapid eye movement (REM) are described. The device may include an array of ultrasound sensors oriented to emit transmit ultrasounds signals in an eyeward direction, wherein the ultrasound sensors are to receive a return signal of the transmit signal reflecting off of a target, and wherein the ultrasound sensors are to output a distance signal representative of a distance to a target, the distance signal generated based on the return signal, and a transceiver to receive the distance signals, wherein the transceiver is to transmit the distance signals from the array of ultrasound sensors to a remote device.

According to examples, systems, devices, and methods for detecting rapid eye movement (REM) are described. The device may include an array of ultrasound sensors oriented to emit transmit ultrasounds signals in an eyeward direction, wherein the ultrasound sensors are to receive a return signal of the transmit signal reflecting off of a target, and wherein the ultrasound sensors are to output a distance signal representative of a distance to a target, the distance signal generated based on the return signal, and a transceiver to receive the distance signals, wherein the transceiver is to transmit the distance signals from the array of ultrasound sensors to a remote device.

A sensor arrangement for a vehicle includes a holding device holding a sensor and a connection arrangement connecting a holding device to a vehicle component. The connection arrangement moves the holding device between an operating position and at least one protecting position. The connection arrangement includes at least one lever arrangement that moves the holding device from the operating position to the at least one protecting position in response to an application of a collision force against the vehicle such that the holding device moves in at least one spatial direction including a first spatial direction, which corresponds to a first force component of the collision force. The connection arrangement includes at least one restoring arrangement that generates a restoring force applied against the at least one lever arrangement to move the holding device from the protecting position back to the operating position.

There is provided an ultrasonic sensor including: a closed-bottom tubular case including a bottom portion and a tubular portion; and a piezoelectric element joined to an inner bottom surface of the closed-bottom tubular case. A porous elastic body is in close contact with the inner bottom surface to include a portion at which an amplitude is maximum in the inner bottom surface when transmitting or receiving an ultrasonic wave in the inner bottom surface. An elastic body having a density higher than a density of the porous elastic body is in close contact to an opening side of the closed-bottom tubular case to include a portion at which vibration is transmitted from the inner bottom surface to the tubular portion of the closed-bottom tubular case.

A sonar aquatic imaging system is provided for obtaining information on aquatic disturbances by imaging the thermal interface in large bodies of water. The imaging system comprises an imager, the imager comprising: a sonar wave emitter configured to emit a sonar wave signal; a reflected wave detector configured to receive a reflected wave signal; a vector network analyzer which includes a Global Navigation Satellite System and an at least one timer, the vector network analyzer in electrical communication with the sonar wave emitter via a first wire and the reflected wave detector via a second wire; and a sonar software programme in electronic communication with the vector network analyzer. The imaging system is provided as part of an aquatic installation.

A sonar aquatic imaging system is provided for obtaining information on aquatic disturbances by imaging the thermal interface in large bodies of water. The imaging system comprises an imager, the imager comprising: a sonar wave emitter configured to emit a sonar wave signal; a reflected wave detector configured to receive a reflected wave signal; a vector network analyzer which includes a Global Navigation Satellite System and an at least one timer, the vector network analyzer in electrical communication with the sonar wave emitter via a first wire and the reflected wave detector via a second wire; and a sonar software programme in electronic communication with the vector network analyzer. The imaging system is provided as part of an aquatic installation.

An acoustic wave device includes a substrate, a multilayer film on the substrate, an LT layer configured by a single crystal of LiTaO.sub.3 on the multilayer film, and an IDT electrode on the LT layer. The thickness of the LT layer is 0.3λ or less where λ is two times a pitch p of electrode fingers in the IDT electrode. Euler angles of the LT layer are (0°±20°, −5° to 65°, 0°±10°), (−120°±20°, −5° to 65°, 0°±10°), or (120°±20°, −5° to 65°, 0°±10°). The multilayer film configured by alternately stacking at least one first layer and at least one second layer. The first layer is comprised of SiO.sub.2. The second layer is comprised of any one of Ta.sub.2O.sub.5, HfO.sub.2, ZrO.sub.2, TiO.sub.2, and MgO.

An acoustic wave device includes a substrate, a multilayer film on the substrate, an LT layer configured by a single crystal of LiTaO.sub.3 on the multilayer film, and an IDT electrode on the LT layer. The thickness of the LT layer is 0.3λ or less where λ is two times a pitch p of electrode fingers in the IDT electrode. Euler angles of the LT layer are (0°±20°, −5° to 65°, 0°±10°), (−120°±20°, −5° to 65°, 0°±10°), or (120°±20°, −5° to 65°, 0°±10°). The multilayer film configured by alternately stacking at least one first layer and at least one second layer. The first layer is comprised of SiO.sub.2. The second layer is comprised of any one of Ta.sub.2O.sub.5, HfO.sub.2, ZrO.sub.2, TiO.sub.2, and MgO.