On-line compensation of instrumental response drift in miniaturized spectrometers

A spectrometer, comprising:

• a light modulator optically coupled to receive input light and to produce modulated light based on the input light;
• a detector optically coupled to detect the modulated light in presence of a sample and to produce an output based on the modulated light;
• a sensor configured to obtain a value of a condition contributing to instrumental drifts in the spectrometer;
• a memory configured to store a correction matrix associating a plurality of sets of correction parameters with sensor values;
• and
• a processor coupled to the detector and configured to extract a set of correction parameters of the plurality of sets of correction parameters from the correction matrix based on the value, the processor further configured to calculate a drift percentage resulting from the instrumental drifts from the set of correction parameters and to divide the output of the detector by the calculated drift percentage to correct the instrumental drifts across all components of the spectrometer including the detector and the light modulator to produce a corrected spectrum of the sample.