Abstract: Optical-electronic device configured to generate a calibration factor for use in determining optical density. The device includes at least one emitter configured to emit light, a detector configured to receive light and transmit data representative of the received light and a processor coupled to the at least one emitter and the detector. The device further includes a non-transitory storage medium coupled to the processor and configured to store instruction to cause the device to perform the calibration method. Additionally, a calibration container includes a main body, upper lid, and a lower lid. The main body is configured to receive the device and an object having known optical properties.

Abstract: Provided herein are methods and devices operable to monitor the hydration of a user. The wearable device for hydration monitoring includes an emitting component operable to emit light having at least three different wavelengths, a sensor operable to receive a reflected portion of the emitted light, and a processor operable to receive signals from the sensor. At least one of the wavelengths is in the range from 900 nm to 1600 nm for optical detection of a level of water. The method for hydration monitoring includes emitting light from a light emitting component operable to emit light having at least three different wavelengths and detecting light with at least one photodetector. At least three distances between the light emitting component and the photodetector are known and the at least three distances allow monitoring of at least two different tissue beds with at least two different tissue depths.

Abstract: Device configured to non-invasively perform tissue monitoring. The device can include at least two light emitting components and at least one photodiode configured to receive reflected light generated from the at least two light emitting components. The at least one photodiode is spaced apart from the at least two light emitting components. The device can include an analog-to-digital converter component configured to generate a digitized detected light signal based on data received from the at least one photodiode. The device can further include a processor configured to execute instructions to process the digitized signals. The device can included an ambient light blocking component configured to surround the at least two light emitting components and the at least one photodiode to prevent external light from entering a region bounded by the ambient light blocking component. The device can also include at least one filter mounted over the at least one photodiode.

Abstract: Apparatus for optical tissue detection and discrimination between a tissue of a user and non-tissue materials and method of optical tissue detection and discrimination between a tissue of a user and non-tissue materials are provided. The apparatus for optical tissue detection includes one or more of light sources. The apparatus can further include at least one photodetector. A processor can be operable to determine whether the detected light is from a tissue of a user.

Abstract: A system for page-based optical data storage includes a sensor array positioned to track a data page when the data page is optically read from or recorded to a storage medium. A servo mechanism is used to position the sensor array. A plurality of alignment points are defined relative to the photodetector pixel array. An alignment arrangement is located at each alignment point. The sensor array further includes servo-feedback signal generation logic operative to drive the servo mechanism based on error signals from the alignment arrangements, thereby aligning the two-dimensional photodetector array with respect to the two-dimensional data page.

Abstract: A system for phase detection in page-based optical data storage involves a number of features that may be used individually or in combination to provide optimizations and to facilitate the heterodyne detection of the modulated readout signal beam. In one aspect, alignment sensors provide signals indicative of angular misalignment between the heterodyne reference beam and the signal beam, and a feedback control system aligns the reference beam with respect to the signal beam. In another aspect, a differential detection approach is utilized. In yet another aspect, a scanning approach is used wherein the reference beam is scanned over approximately a wavelength of phase difference to cause interference fringes to shift over the photodetector pixel array. Each pixel detects the signal at the phase value that cancels out localized variations of the wavefront, thus increasing the tolerance of the system to phase errors and to angular misalignments.