Apparatus and methods for hyperspectral imaging with on-chip digital time delay and integration
An apparatus and corresponding method for line-scan imaging can include a 2D array of light-sensitive detector elements that detect light from a target scene. The 2D array can be divided into a plurality of sub-arrays and supported by an analog amplification and signal conditioning module portion of a read-out integrated circuit (ROIC), the analog module having one or more replicated amplification and signal conditioning circuits in communication with the 2D array detector elements. An analog-to-digital (A/D) conversion electrical circuit module and one or more digital time-delay and integration (TDI) modules can be situated in a portion of the ROIC not supporting the 2D array. The TDI modules can perform TDI of the detector sub-arrays. Embodiments enable hyperspectral images to be obtained with greater imaging range and higher signal-to-noise ratios.
1. An apparatus for line-scan imaging, the apparatus comprising:
a 2D array of light-sensitive detector elements configured to detect light from a target scene to be imaged, the 2D array divided into a plurality of sub-arrays and supported by an analog amplification and signal conditioning module portion of a read-out integrated circuit (ROIC), the analog amplification and signal conditioning module comprising one or more replicated amplification and signal conditioning circuits in individual electrical communication with the detector elements of the 2D array;
an analog-to-digital (A/D) conversion electrical circuit module disposed in a portion of the ROIC not supporting the 2D array; and
one or more digital time-delay and integration (TDI) modules in the portion of the ROIC not supporting the 2D array, the one or more TDI modules configured to perform TDI of individual sub-arrays of the detector elements.
2. The apparatus of claim 1 , wherein each of the plurality of sub-arrays includes one row of the 2D array.
3. The apparatus of claim 1 , wherein each sub-array of the 2D array includes a plurality of rows of the 2D array.
4. The apparatus of claim 1 , wherein the 2D array of light-sensitive detector elements are sensitive to infrared light.
5. The apparatus of claim 1 , wherein the 2D array of light-sensitive detector elements are sensitive to one of long wavelength infrared (LWIR) light, mid wavelength infrared (MWIR) light, or short wavelength infrared (SWIR) light.
6. The apparatus of claim 1 , wherein the 2D array of light-sensitive detector elements are sensitive to visible light.