Patent ID: 9046418
Filing Date: 2015-06-02
Classification: G01J,G02B

Abstract:
1. A solid state spectrometer, the solid state spectrometer comprising: a single differential linear Fresnel grating defining one of an optical axis and an optical axis plane, wherein the grating receives incident light and causes Fresnel diffraction that disperses the incident light according to the wavelength of the incident light onto the optical axis or the optical axis plane; a detector having a dispersion area and a sensing area coinciding with the optical axis or the optical axis plane, the detector detecting a distribution of dispersed light on the sensing area and measuring at least a selected one of light intensity and light wavelength of the dispersed light; the detector is configured to measure the wavelength or intensity of one or more distinct wavelengths without having any moving parts; and the single differential linear Fresnel grating element is in a perpendicular configuration with the detector; wherein the single differential linear Fresnel grating is configured to provide the dispersion area of the detector with a minimal optical path volume for the dispersed light, such that the dispersion area defines the smallest area capable of detecting all dispersions for a wavelength range.