Large spot size spectrometer

An optical device, comprising:

• an optical head comprising a plastic molded part, an aperture formed within the plastic molded part, a plurality of reflectors formed within the plastic molded part around the aperture, and a plurality of lamps, each lamp of the plurality of lamps being assembled within a respective one of the plurality of reflectors;
• an optical window positioned on the optical head, the optical window configured to receive a sample, to pass input light from the plurality of lamps to the sample, and to pass scattered light scattered from the sample towards the aperture, the aperture comprising a shape and a diameter configured to filter a first portion of the scattered light and to pass a second portion of the scattered light, the first portion of the scattered light containing unusable sample information;
• and
• a spectrometer configured to receive the second portion of the scattered light at an input thereof and to obtain a spectrum of the sample based on the second portion of the scattered light;
• wherein the unusable sample information comprises a direct current (DC) component of the scattered light, and the aperture is configured to limit a first spectrometer acceptance angle of the DC component of the scattered light and maintain a second spectrometer acceptance angle of an alternating current (AC) component of the scattered light.