Abstract: Devices and systems for controlling pressure during sensing are disclosed. Such sensors and/or systems may be embodied in a wearable user device. The wearable user device may include a cuff configured to apply a pressure to a portion of a user at a plurality of discrete pressure levels over a plurality of time periods; a biometric sensor configured to obtain a plurality of sensor measurements associated with a blood vessel of the user at corresponding ones of the plurality of discrete pressure levels during corresponding ones of the plurality of time periods; and a wearable structure including the cuff and the biometric sensor.

Abstract: Synchronized sensors and systems are disclosed. Techniques involving a synchronized sensor system for determining a physiological parameter of a user may include: obtaining one or more first measurements at a first location of the user via a first sensor; obtaining one or more second measurements at a second location of the user via a second sensor; and determining the physiological parameter of the user based on the one or more first measurements, the one or more second measurements, and a distance between the first location and the second location, the distance between the first location and the second location determined based on acoustic communication between the first sensor and the second sensor. In some implementations, acoustic communication may include ultrasound signals between the first sensor and the second sensor, which may be time synchronized by exchanging timestamps.

Abstract: An apparatus may include a platen, an electromagnetic interference (EMI)-reducing system including a first EMI-reducing layer, a light source system and a receiver system. The light source system may include a light-emitting component, light source system circuitry and a light guide system and may be configured to emit light through the first EMI-reducing layer to a first platen area via a light pipe between the first EMI-reducing layer and the platen. The light guide system may include a light-directing element for directing light from the first EMI-reducing layer to the light pipe. The receiver system may be configured to detect acoustic waves corresponding to a photoacoustic response of a target object in contact with the first platen area to light emitted by the light source system. The first EMI-reducing layer may reduce a level of EMI emitted by the light source system circuitry that is received by receiver system circuitry.

Abstract: An apparatus may include a platen, a light source system and an ultrasonic receiver system. The platen may be configured to separate one or more received arterial ultrasonic waves generated by blood in an artery, by an arterial wall, or by a combination thereof, from one or more other types of received ultrasonic waves. The platen may have an outer surface with an acoustic impedance that is configured to approximate the acoustic impedance of human skin. The outer surface of the platen may be configured to conform to a surface of the human skin. The apparatus may include a noise reduction system. The light source system may include at least one multi-junction laser diode. The apparatus may include a mirror layer residing between the ultrasonic receiver system and the platen.

Abstract: An apparatus may include a platen, a light source system and an ultrasonic receiver system. The platen may be configured to separate one or more received arterial ultrasonic waves generated by blood in an artery, by an arterial wall, or by a combination thereof, from one or more other types of received ultrasonic waves. The platen may have an outer surface with an acoustic impedance that is configured to approximate the acoustic impedance of human skin. The outer surface of the platen may be configured to conform to a surface of the human skin. The apparatus may include a noise reduction system. The light source system may include at least one multi-junction laser diode. The apparatus may include a mirror layer residing between the ultrasonic receiver system and the platen.

Abstract: An apparatus may include a platen, a light source system and an ultrasonic receiver system. The platen may be configured to separate one or more received arterial ultrasonic waves generated by blood in an artery, by an arterial wall, or by a combination thereof, from one or more other types of received ultrasonic waves. The platen may have an outer surface with an acoustic impedance that is configured to approximate the acoustic impedance of human skin. The outer surface of the platen may be configured to conform to a surface of the human skin. The apparatus may include a noise reduction system. The light source system may include at least one multi-junction laser diode. The apparatus may include a mirror layer residing between the ultrasonic receiver system and the platen.

Abstract: An apparatus may include a platen, a light source system and an ultrasonic receiver system. The platen may be configured to separate one or more received arterial ultrasonic waves generated by blood in an artery, by an arterial wall, or by a combination thereof, from one or more other types of received ultrasonic waves. The platen may have an outer surface with an acoustic impedance that is configured to approximate the acoustic impedance of human skin. The outer surface of the platen may be configured to conform to a surface of the human skin. The apparatus may include a noise reduction system. The light source system may include at least one multi-junction laser diode. The apparatus may include a mirror layer residing between the ultrasonic receiver system and the platen.

Abstract: An apparatus may include a platen, a light source system and an ultrasonic receiver system. The platen may be configured to separate one or more received arterial ultrasonic waves generated by blood in an artery, by an arterial wall, or by a combination thereof, from one or more other types of received ultrasonic waves. The platen may have an outer surface with an acoustic impedance that is configured to approximate the acoustic impedance of human skin. The outer surface of the platen may be configured to conform to a surface of the human skin. The apparatus may include a noise reduction system. The light source system may include at least one multi-junction laser diode. The apparatus may include a mirror layer residing between the ultrasonic receiver system and the platen.

Abstract: Some disclosed devices include a light source system, a target detection system; and a control system configured to communicate with the light source system and the target detection system. The control system may be further configured to receive target detection data from the target detection system, to estimate the presence or absence of a biological target based, at least in part, on the target detection data and to enable or disable the light source system based, at least in part, on an estimation of the presence or absence of the biological target. For example, if the biological target is detected, the control system may enable the light source system.

Abstract: Aspects of the present disclosure relate to systems and methods for determining one or more depths. An example system includes a time-of-flight receiver configured to sense pulses from reflections of light from a structured light transmitter. An example method includes sensing, by a time-of-flight receiver, pulses from reflections of light from a structured light transmitter.

Abstract: Aspects of the present disclosure relate to active depth sensing. An example device may include a memory and a processor coupled to the memory. The processor may be configured to determine an amount of ambient light for a scene to be captured by a structured light receiver and adjust an exposure time for frame capture of a sensor of the structured light receiver based on the determined amount of ambient light. The exposure time of the sensor of the structured light receiver is inversely related to the determined amount of ambient light. The processor further may be configured to receive a plurality of captured frames from the structured light receiver based on the adjusted exposure time and generate an aggregated frame, including aggregating values across the plurality of captured frames.

Abstract: Aspects of the present disclosure relate to active depth sensing. An example device may include a memory and a processor coupled to the memory. The processor may be configured to determine an amount of ambient light for a scene to be captured by a structured light receiver and adjust an exposure time for frame capture of a sensor of the structured light receiver based on the determined amount of ambient light. The exposure time of the sensor of the structured light receiver is inversely related to the determined amount of ambient light. The processor further may be configured to receive a plurality of captured frames from the structured light receiver based on the adjusted exposure time and generate an aggregated frame, including aggregating values across the plurality of captured frames.

Abstract: Aspects of the present disclosure relate to systems and methods for determining one or more depths. An example system includes a time-of-flight receiver configured to sense pulses from reflections of light from a structured light transmitter. An example method includes sensing, by a time-of-flight receiver, pulses from reflections of light from a structured light transmitter.

Abstract: Methods, systems, and apparatuses are provided to compensate for a misalignment of optical devices within an imaging system. For example, the methods receive image data captured by a first optical device having a first optical axis and a second optical device having a second optical axis. The methods also receive sensor data indicative of a deflection of a substrate that supports the first and second optical devices. The deflection can result from a misalignment of the first optical axis relative to the second optical axis. The methods generate a depth value based on the captured image data and the sensor data. The depth value can reflect a compensation for the misalignment of the first optical axis relative to the second optical axis.

Abstract: Methods, systems, and apparatuses are provided to compensate for a misalignment of optical devices within an imaging system. For example, the methods receive image data captured by a first optical device having a first optical axis and a second optical device having a second optical axis. The methods also receive sensor data indicative of a deflection of a substrate that supports the first and second optical devices. The deflection can result from a misalignment of the first optical axis relative to the second optical axis. The methods generate a depth value based on the captured image data and the sensor data. The depth value can reflect a compensation for the misalignment of the first optical axis relative to the second optical axis.

Abstract: An aspect of this disclosure is an apparatus for capturing images. The apparatus comprises a first image sensor, a second image sensor, and at least one controller coupled to the first image sensor and the second image sensor. The controller is configured to determine a first exposure time of the first image sensor and a second exposure time of the second image sensor. The controller is further configured to control an exposure of the first image sensor according to the first exposure time and control an exposure of the second image sensor according to the second exposure time. The controller also determines a difference between the first and second exposure times and generates a signal for synchronizing image capture by the first and second image sensors based on the determined difference between the first and second exposure times.