Disclosed are a biosignal measurement device and a capacitively-coupled active electrode. The capacitively-coupled active electrode includes an electrode face configured to form capacitive coupling with a subject in a non-contact manner to detect a biosignal, and a pre-amplifier disposed on a rear side of the electrode face and embedded in a porous insulator.

Wearable technologies for personalized monitoring require sensors that track biomarkers often present at low levels. Cortisola key stress biomarkeris present in sweat at low nanomolar concentrations. Previous wearable sensing systems are limited to analytes in the micromolar-millimolar ranges. To overcome these and other limitations, the present embodiments include a flexible field-effect transistor (FET) biosensor array that exploits a new cortisol aptamer coupled to nanometer-thin-film In.sub.2O.sub.3 FETs. Cortisol levels were determined via molecular recognition by aptamers where binding was transduced to electrical signals on FETs. The physiological relevance of cortisol as a stress biomarker was demonstrated by tracking salivary cortisol levels in participants in a Trier Social Stress Test and establishing correlations between cortisol in diurnal saliva and sweat samples. These correlations motivated the development and on-body validation of an aptamer-FET array-based smartwatch equipped with a custom, multi-channel, self-referencing autonomous source measurement unit enabling seamless, real-time cortisol sweat sensing.

Wearable technologies for personalized monitoring require sensors that track biomarkers often present at low levels. Cortisola key stress biomarkeris present in sweat at low nanomolar concentrations. Previous wearable sensing systems are limited to analytes in the micromolar-millimolar ranges. To overcome these and other limitations, the present embodiments include a flexible field-effect transistor (FET) biosensor array that exploits a new cortisol aptamer coupled to nanometer-thin-film In.sub.2O.sub.3 FETs. Cortisol levels were determined via molecular recognition by aptamers where binding was transduced to electrical signals on FETs. The physiological relevance of cortisol as a stress biomarker was demonstrated by tracking salivary cortisol levels in participants in a Trier Social Stress Test and establishing correlations between cortisol in diurnal saliva and sweat samples. These correlations motivated the development and on-body validation of an aptamer-FET array-based smartwatch equipped with a custom, multi-channel, self-referencing autonomous source measurement unit enabling seamless, real-time cortisol sweat sensing.

Hat, helmet, and other headgear apparatus includes dry electrophysiological electrodes and, optionally, other physiological and/or environmental sensors to measure signals such as ECG from the head of a subject. Methods of use of such apparatus to provide fitness, health, or other measured or derived, estimated, or predicted metrics are also disclosed.

An electrode device provides non-invasive non-contact measurements of biological signals such as from the heart, muscles, or brain (ECG, EMG, EEG) from a subject. The exemplary electrode device is a non-contact sensor that does not make an ohmic/galvanic connection to the skin but rather acquires the signal by forming a capacitor with the skin at the sensing site. The exemplary electrode device is configured with a feedback path that is defined based on, or as a function, of proximity. Thus, in response to motion, unwanted currents are cancelled, and the gain does not change.

An electrode device provides non-invasive non-contact measurements of biological signals such as from the heart, muscles, or brain (ECG, EMG, EEG) from a subject. The exemplary electrode device is a non-contact sensor that does not make an ohmic/galvanic connection to the skin but rather acquires the signal by forming a capacitor with the skin at the sensing site. The exemplary electrode device is configured with a feedback path that is defined based on, or as a function, of proximity. Thus, in response to motion, unwanted currents are cancelled, and the gain does not change.

A biological information detection system includes a biosensor and a case that is capable of housing the biosensor. The biosensor includes a first storage unit and a first communication unit. The case includes a second communication unit, a third communication unit, and a case controller. The case controller is capable of performing an information reception process and an output process. The information reception process is a process of receiving biological information and sensor identification information by using the second communication unit. The output process is a process of transmitting, from the third communication unit to an external device, the biological information and the sensor identification information, which are received in the information reception process, in association with each other.

A biological information detection system includes a biosensor and a case that is capable of housing the biosensor. The biosensor includes a first storage unit and a first communication unit. The case includes a second communication unit, a third communication unit, and a case controller. The case controller is capable of performing an information reception process and an output process. The information reception process is a process of receiving biological information and sensor identification information by using the second communication unit. The output process is a process of transmitting, from the third communication unit to an external device, the biological information and the sensor identification information, which are received in the information reception process, in association with each other.

A wireless resistive analog passive (WRAP) sensor system using inductive coupling between two or more planar printed spiral coils (PSCs) configured to capture various physiological signals, such as, but not limited to, heart rate, respiration rate, pulse oxymeter, and core body temperature. The sensor system particularly useful for capturing physiological signals that require differential inputs, such as an ECG, EKG, EMG or EEG signals. Wireless induction coupling signals are transmitted over longer range using a fully-passive (i.e., battery-less) range extender circuit comprising a paired coil. The sensor system may include body-worn, fully-passive (battery-less) sensors.

A wireless resistive analog passive (WRAP) sensor system using inductive coupling between two or more planar printed spiral coils (PSCs) configured to capture various physiological signals, such as, but not limited to, heart rate, respiration rate, pulse oxymeter, and core body temperature. The sensor system particularly useful for capturing physiological signals that require differential inputs, such as an ECG, EKG, EMG or EEG signals. Wireless induction coupling signals are transmitted over longer range using a fully-passive (i.e., battery-less) range extender circuit comprising a paired coil. The sensor system may include body-worn, fully-passive (battery-less) sensors.