Spectrometry system with decreased light path
A spectrometer comprises a plurality of isolated optical channels comprising a plurality of isolated optical paths. The isolated optical paths decrease cross-talk among the optical paths and allow the spectrometer to have a decreased length with increased resolution. In many embodiments, the isolated optical paths comprise isolated parallel optical paths that allow the length of the device to be decreased substantially. In many embodiments, each isolated optical path extends from a filter of a filter array, through a lens of a lens array, through a channel of a support array, to a region of a sensor array. Each region of the sensor array comprises a plurality of sensor elements in which a location of the sensor element corresponds to the wavelength of light received based on an angle of light received at the location, the focal length of the lens and the central wavelength of the filter.
1. A system for spectrometric detection, comprising: an imaging detector; and a plurality of optical channels comprising a filter array, an aperture array, and a lens array, wherein the plurality of optical channels are localized to distinct regions of the imaging detector, wherein the plurality of optical channels are configured to direct light from a sample sequentially through the filter array, the aperture array, and the lens array to the imaging detector, wherein the filter array is configured to angularly encode the light, and wherein the lens array transforms the angularly encoded light into a spatially-encoded spectrum.
2. The system of claim 1 , further comprising a local processing unit configured to convert an image from the image detector into a raw spectrum.
3. The system of claim 2 , further comprising a remote processing unit configured to analyze the raw spectrum.
4. The system of claim 1 , wherein the imaging detector comprises a plurality of regions, each region of the plurality of regions comprising multiple sensors.
5. The system of claim 4 , wherein the system is configured to establish a parallel light path for each filter of the filter array, such that there are an equal number of non-intersecting light paths as there are filters in the filter array.
6. The system of claim 4 , wherein two regions of the plurality of regions of the imaging detector correspond to separate optical channels.
7. The system of claim 4 , wherein lenses of the lens array comprise substantially the same focal length such that the lens array and the sensor array are arranged in a substantially parallel configuration.
8. The system of claim 4 , wherein the imaging detector comprises a CCD or 2D CMOS.
9. The system of claim 1 , wherein an effective range of wavelengths passed by a filter of the filter array is greater than a bandwidth of the filter of the filter array.
10. The system of claim 1 , wherein the filter array comprises at least 4 filters.
11. The system of claim 1 , wherein a central wavelength of each filter of the filter array is at least 4 nm from the central wavelength of each other filter of the filter array.
12. The system of claim 1 , further comprising a diffuser, wherein the diffuser provides a substantially homogenous distribution of light energy among the filters of the filter array.
13. The system of claim 12 , further comprising a second diffuser located between the diffuser and the sample.
14. The system of claim 1 , wherein the plurality of optical channels is configured to establish an isolated light path from a single filter of the filter array to a single region of the imaging detector.
15. The system of claim 1 , wherein the lens array is positioned to be at a distance approximately equal to a focal length of the lens away from the imaging detector, such that light coming from each lens is substantially focused on the imaging detector.
16. The system of claim 1 , wherein the lens array, the filter array, and the detector are not centered on a common optical axis.
17. The system of claim 1 , wherein the light comprises scattered ambient light.
18. The system of claim 1 , wherein the spectral range received on the imaging detector extends from 10 nm to 1600 nm.
19. The system of claim 1 , wherein the spectral resolution of the system is less than 10 nm.