A method for measuring an optical sensor system comprising an array of intrinsic fiber optic sensors at an interrogator comprising an optical source and an optical detector, the method comprising the steps of: emitting an optical signal to the array of intrinsic fiber optic sensors; detecting optical responses to the emitted signal from the sensors; associating each detected optical response with an individual sensor by determining within which region among a plurality of detection regions assigned to the individual sensors the optical response is detected; wherein each detection region corresponds to a wavelength range in the bandwidth of the optical sensor system; and performing signal processing on each optical response to measure the value of the physical parameter detected by its associated sensor; wherein a calibration of the detection region assigned to each sensor is performed at predetermined intervals, wherein the minimum bandwidth of the detection region assigned to each sensor during calibration corresponds to the required dynamic signal range of the sensor, and wherein the calibration of the detection region assigned to each sensor comprises: determining if the spacing between the boundaries of two or more detection regions is less than a threshold value; and if it is determined that the spacing is less than the threshold value, proportionally reducing the bandwidth of all of the detection regions while retaining the required minimum bandwidth of each region until the spacing between the boundaries of the two or more detection regions exceeds the threshold value. emitting an optical signal to the array of intrinsic fiber optic sensors; detecting optical responses to the emitted signal from the sensors; associating each detected optical response with an individual sensor by determining within which region among a plurality of detection regions assigned to the individual sensors the optical response is detected; wherein each detection region corresponds to a wavelength range in the bandwidth of the optical sensor system; and performing signal processing on each optical response to measure the value of the physical parameter detected by its associated sensor; wherein a calibration of the detection region assigned to each sensor is performed at predetermined intervals, wherein the minimum bandwidth of the detection region assigned to each sensor during calibration corresponds to the required dynamic signal range of the sensor, and wherein the calibration of the detection region assigned to each sensor comprises: determining if the spacing between the boundaries of two or more detection regions is less than a threshold value; and if it is determined that the spacing is less than the threshold value, proportionally reducing the bandwidth of all of the detection regions while retaining the required minimum bandwidth of each region until the spacing between the boundaries of the two or more detection regions exceeds the threshold value. determining if the spacing between the boundaries of two or more detection regions is less than a threshold value; and if it is determined that the spacing is less than the threshold value, proportionally reducing the bandwidth of all of the detection regions while retaining the required minimum bandwidth of each region until the spacing between the boundaries of the two or more detection regions exceeds the threshold value.