Spectrometer

Abstract

A spectrometer including a light input element, a collimator, a grating, a focusing module, an optical sensor and a plano-convex lens is provided. The light input element has an effective slit height and is used to receiving a light to be measured. The collimator is used to receive and collimate the light to be measured, and to limit the light to be measured at a longitudinal angle. The grating is used to receive and split the collimated light to be measured. A first longitudinal dioptric power of the focusing module is smaller than a first horizontal dioptric power of the focusing module, so that the light to be measured is emitted at a first longitudinal focusing angle. The optical sensor is arranged on the horizontal imaging plane of the focusing module and has a sensing height which is smaller than the effective slit height. The plano-convex lens has a second longitudinal dioptric power of a positive value, so that the light to be measured is emitted to the optical sensor at a second longitudinal focusing angle. The ratio of the longitudinal angle to the second longitudinal focusing angle is less than or equal to the ratio of the sensing height to the effective slit height.

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