Patent ID: 8108173
Filing Date: 2012-01-31
Classification: A61B,G01N

Abstract:
1. A sensor configured to determine information related to one or more gaseous analytes in a body of fluid, the sensor comprising: an emitter configured to emit electromagnetic radiation such that the intensity of the emitted electromagnetic radiation oscillates in a periodic manner; a luminescable medium in operative communication with the body of fluid and arranged to receive electromagnetic radiation from the emitter, wherein the luminescable medium emits luminescent radiation in response to the electromagnetic radiation received from the emitter; a radiation sensor arranged to receive the luminescent radiation, the radiation sensor generating an output signal that conveys information related to an intensity of the received luminescent radiation; and a processor configured to sample the output signal generated by the radiation sensor at two or more predetermined periodic points over the oscillation of the intensity of the electromagnetic radiation emitted by the emitter, and wherein the processor determines information, based on the samples of the output signal, related to a phase difference between the oscillation of the intensity of the electromagnetic radiation emitted by the emitter and oscillation of the intensity of the luminescent radiation received by the radiation sensor, wherein the processor is further configured to determine, based on the samples of the output signal, an amplitude of the oscillation of the intensity of the luminescent radiation received by the radiation sensor.