Dual spectrometer

A method comprising:

• initiating illumination of a sample with a first portion of electromagnetic radiation in a first region of an electromagnetic spectrum;
• receiving an indication of at least one of a presence or an absence associated with a sample constituent of the sample determined by detecting the sample constituent of the sample by analyzing a characteristic of electromagnetic radiation obtained from the sample associated with the first portion of electromagnetic radiation in the first region of the electromagnetic spectrum;
• and
• initiating illumination of the sample with a second portion of electromagnetic radiation in a second region of the electromagnetic spectrum based upon the at least one of the presence or the absence of the sample constituent of the sample.

A system comprising:

• an infrared radiation source configured to illuminate a sample with a first portion of electromagnetic radiation in a first region of an electromagnetic spectrum;
• a laser source configured to illuminate a sample with a second portion of electromagnetic radiation in a second substantially monochromatic region of the electromagnetic spectrum;
• a detector module configured to detect a sample constituent of a sample by analyzing a characteristic of electromagnetic radiation reflected from the sample associated with the infrared radiation source and a characteristic of Raman electromagnetic radiation scattered by the sample and associated with the laser source;
• and
• a linear variable filter for dispersing light from a sample onto the detector module.