Sensor that detects a heart rate and/or a blood oxygen content, and method of operating a sensor

A sensor that detects a heart rate and/or a blood oxygen content. comprising a radiation source and a photodetector, wherein the radiation source comprises a light-emitting diode array, the light-emitting diode array comprises a plurality of emission regions, the emission regions each comprise a first light-emitting diode and a second light-emitting diode, the first light-emitting diode comprises a first wavelength, the second light-emitting diode comprises a second wavelength, and a distance between the first light-emitting diode and the second light-emitting diode within the emission regions is 100 micrometers or less.

A method of operating a sensor, wherein the sensor comprises a radiation source and a photodetector, the radiation source comprises a light-emitting diode array, the light-emitting diode array comprises a plurality of emission regions, the emission regions each comprise a first light-emitting diode and a second light-emitting diode, the first light-emitting diode comprises a source of green light, the second light-emitting diode comprises an infrared source, the distance between the first light-emitting diode and the second light-emitting diode within the emission regions is a maximum of 100 micrometers, the sensor comprises a controller, the controller is configured to operate the first light-emitting diodes and the second light-emitting diodes independently of one another, the first light-emitting diodes and the second light-emitting diodes are each operated with a variable voltage oscillating between zero volts and an operating voltage, the oscillating variable frequency of each light-emitting diode comprises a dedicated frequency, the signal of the photodetector is divided into individual components on the basis of the dedicated frequencies, and the individual components are assigned to the light-emitting diodes on the basis of the dedicated frequencies.