An optomechanical device for modulating an optical signal for reducing thermal noise and tracking mechanical resonance of a proof mass assembly comprises a circuit configured to receive, from a light-emitting device, the optical signal and modulate the optical signal to remove thermal noise and to drive a mechanical response frequency to the mechanical resonance of the proof mass assembly using a cooling feedback signal and a mechanical resonance feedback signal. The circuit is further configured to generate, using the modulated optical signal, the cooling feedback signal to correspond to a thermal noise signal of the modulated optical signal with a total loop gain of zero and a phase difference of 180 degrees and generate, using the modulated optical signal, the mechanical resonance feedback signal to drive the mechanical response frequency of the modulated optical signal to the mechanical resonance.

Microelectronic structure comprising a mobile mass mechanically linked to a first and to a second mechanical element by first and second mechanical linking device respectively, a polarisation source for the second mechanical linking device. The second mechanical linking means comprises two linking elements and a thermal reservoir placed between the linking elements, where at least one of the linking elements is made of piezoresistive material, where at least one of the first and second linking elements exhibit thermoelasticity properties. The thermal reservoir exhibits a thermal capacity which is different from those of the linking elements. The second linking device and the mobile mass are arranged relative to each other such that displacement of the mobile mass applies a mechanical stress to the second linking means.

According to one embodiment, an apparatus comprising a portable monitoring device to be affixed to a user. The portable monitoring device including: 1) a set of one or more sensors to generate sensor data indicative of physical activity of a user when the portable monitoring device is affixed to the user; and 2) processing circuitry coupled with the set of sensors, to detect that the user has been sedentary for a period of time, and cause the portable monitoring device to alert the user responsive to the detection to encourage the user to move.

A finger-mounted device may include finger-mounted units. The finger-mounted units may each have a body that serves as a support structure for components such as force sensors, accelerometers, and other sensors and for haptic output devices. The body may have sidewall portions coupled by a portion that rests adjacent to a user's fingernail. The body may be formed from deformable material such as metal or may be formed from adjustable structures such as sliding body portions that are coupled to each other using magnetic attraction, springs, or other structures. The body of each finger-mounted unit may have a U-shaped cross-sectional profile that leaves the finger pad of each finger exposed when the body is coupled to a fingertip of a user's finger. Control circuitry may gather finger press input, lateral finger movement input, and finger tap input using the sensors and may provide haptic output using the haptic output device.

In one aspect, a system for detecting plugging of an agricultural implement may a disc rotatably coupled to a frame member, with the disc configured to rotate relative to soil within a field as the implement is moved across the field. The system may also include a disc scraper coupled to the frame member, with the disc scraper configured to remove the soil from the disc as the disc rotates relative to the soil. Furthermore, the system may include a sensor configured to detect a parameter indicative of an acceleration of the disc scraper relative to frame member. Additionally, a controller of the system may be configured to monitor the acceleration of the disc scraper relative to the frame member based on data received from the sensor. Moreover, the controller may be further configured to determine when the disc is plugged based on the monitored acceleration.

An optomechanical device for modulating an optical signal for reducing thermal noise and tracking mechanical resonance of a proof mass assembly comprises a circuit configured to receive, from a light-emitting device, the optical signal and modulate the optical signal to remove thermal noise and to drive a mechanical response frequency to the mechanical resonance of the proof mass assembly using a cooling feedback signal and a mechanical resonance feedback signal. The circuit is further configured to generate, using the modulated optical signal, the cooling feedback signal to correspond to a thermal noise signal of the modulated optical signal with a total loop gain of zero and a phase difference of 180 degrees and generate, using the modulated optical signal, the mechanical resonance feedback signal to drive the mechanical response frequency of the modulated optical signal to the mechanical resonance.

In order to avoid erroneous count of the number of steps in a case where a user is using a traveling means other than walking, a step counting section (13) switches between acceleration value change period ranges for counting the number of steps, depending on whether a traveling means determining section (11) determines that the user is walking or that the user is using a traveling means other than walking.

An optomechanical device comprising a circuit configured to generate an optical signal using a tuning signal and modulate the optical signal at a frequency corresponding to one quarter of a Full Width at Half Maximum (FWHM) of an optical resonance of the proof mass assembly to generate a partially modulated optical signal. The circuit being further configured to filter the partially modulated optical signal to remove a central carrier from the partially modulated optical signal to generate a filtered optical signal, modulate the filtered optical signal to generate a modulated optical signal driven to the mechanical resonance of the proof mass assembly, and generate the tuning signal using a difference between a DC intensity level of a first optical frequency component in the modulated optical signal and a DC intensity level of a second optical frequency component in the modulated optical signal.

An electronic device, system, and method for sending and receiving a communication relating to a beverage bottle to and from an electronic device, in which the electronic device may include a receiving portion including an aperture configured to receive a neck of a beverage container; a processor; memory; wireless communication circuitry; at least one actuator; and at least one indicator. The electronic device may be configured to attach to the neck of the beverage container via the receiving portion. The wireless communication circuitry may be configured to receive a wireless communication. The processor may be configured to activate the at least one indicator in response to the communication.

Systems, methods, and non-transitory computer readable media may be configured to calibrate sensor measurements based on detection of brake light. Acceleration information of a first vehicle may be obtained. The acceleration information may define an acceleration probability distribution of the first vehicle. Image information may be obtained. The image information may define an image of the first vehicle. Whether a brake light of the first vehicle is on or off may be determined based on the image of the first vehicle. Based on a determination that the brake light of the first vehicle is on, a calibrated acceleration probability distribution of the first vehicle may be generated based on the acceleration probability distribution of the first vehicle and a braking-calibration curve.