Hyperspectral sensing system
A hyperspectral sensing device may include an optical collector configured to collect light and to transfer the collected light to a sensor having spectral resolution sufficient for sensing hyperspectral data. In some examples, the sensor comprises a compact spectrometer. The device further comprises a power supply, an electronics module, and an input/output hub enabling the device to transmit acquired data (e.g., to a remote server). In some examples, a plurality of hyperspectral sensing devices are deployed as a network to acquire data over a relatively large area.
1. A method of assessing water quality, the method comprising:
receiving ambient light through a first aperture of a housing of an optical device disposed adjacent a surface of a body of water, the first aperture being directed at the surface of the body of water, wherein the light received through the first aperture includes light reflected from the surface and light passing through the surface from underneath;
receiving ambient light through a second aperture of the housing, the second aperture being directed at the sky, wherein the light received through the second aperture includes light coming from the sky;
receiving the light received through the first and second apertures at a sensing assembly disposed within the housing;
sensing, using the sensing assembly, data corresponding to a spectrum of the light received at the sensing assembly; and
determining, based on the sensed data, a spectrum of light originating underneath the surface of the body of water.
2. The method of claim 1 , wherein the sensing assembly comprises a first spectrometer and a second spectrometer, and receiving the light received through the first and second apertures at the sensing assembly includes receiving the light received through the first aperture at the first spectrometer and receiving the light received through the second aperture at the second spectrometer.
3. The method of claim 1 , wherein the sensing assembly comprises a spectrometer, and receiving the light received through the first and second apertures at the sensing assembly includes receiving the light received through the first and second apertures at the spectrometer.
4. The method of claim 3 , wherein the light received through the first aperture and the light received through the second aperture are received at the spectrometer simultaneously.
5. The method of claim 3 , further comprising modulating at least one of the light received through the first aperture and the light received through the second aperture.
6. The method of claim 5 , wherein the modulating comprises wavelength-modulating.
7. The method of claim 1 , wherein determining the spectrum of light originating underneath the surface of the body of water includes using a bidirectional reflectance distribution function.
8. The method of claim 1 , wherein the sensing assembly has a spectral domain of 300 nm to 900 nm.
9. The method of claim 1 , further comprising receiving, through at least one of the first and second apertures, light reflected from a reference plaque disposed above the surface of the body of water.
10. The method of claim 1 , wherein the first and second apertures are disposed on a first portion of the housing, the sensing assembly is disposed within a second portion of the housing, and the first portion of the housing is removably attached to the second portion of the housing.
11. The method of claim 1 , wherein receiving the light received through the first and second apertures at the sensing assembly includes directing at least one of the light received through the first aperture and the light received through the second aperture into the sensing assembly, using at least one optical element.
12. A method of assessing water quality, the method comprising:
receiving ambient light through a first aperture of an optical device disposed adjacent a surface of a body of water, the first aperture being directed at the surface of the body of water, such that the light received through the first aperture includes light reflected from the surface and light passing through the surface from underneath;
receiving ambient light through a second aperture of the optical device, the second aperture being directed away from the surface, such that the light received through the second aperture includes light downwelling from the sky;
receiving the light received through the first and second apertures at a sensing assembly disposed within a housing of the optical device;
sensing, using the sensing assembly, spectral data corresponding to the light received through the first and second apertures; and
determining, based on the sensed spectral data, information about light emerging from beneath the surface of the body of water.
13. The method of claim 12 , wherein at least one of the first and second apertures comprises an aperture of an optical collector removably attached to the housing of the optical device.
14. The method of claim 12 , wherein determining information about light emerging from beneath the surface of the body of water includes determining a spectrum of the light emerging from beneath the surface of the body of water.
15. The method of claim 12 , wherein the sensing assembly comprises a first spectrometer and a second spectrometer, receiving the light received through the first and second apertures at the sensing assembly includes receiving the light received through the first aperture at the first spectrometer and receiving the light received through the second aperture at the second spectrometer, and sensing spectral data corresponding to the light received through the first and second apertures includes sensing a first spectrum using the first spectrometer and sensing a second spectrum using the second spectrometer.
16. The method of claim 12 , wherein the sensing assembly comprises a spectrometer, and receiving the light received through the first and second apertures at the sensing assembly includes receiving the light received through the first and second apertures at the spectrometer.
17. The method of claim 16 , wherein sensing spectral data corresponding to the light received through the first and second apertures includes sensing a first spectrum of light received through the first aperture and sensing a second spectrum of light received through the second aperture.
18. The method of claim 16 , wherein the light received through the first aperture and the light received through the second aperture are received at the spectrometer simultaneously, and wherein sensing spectral data corresponding to the light received through the first and second apertures includes sensing a spectrum of combined light received through the first aperture and light received through the second aperture.
19. The method of claim 12 , wherein receiving the light received through the first and second apertures at the sensing assembly includes directing at least one of the light received through the first aperture and the light received through the second aperture into the sensing assembly, using at least one optical element.