High dynamic range spatial heterodyne one-dimensional imaging spectroscopy based on a digital micromirror device.

Area of Science:

• Spectroscopy
• Optical Engineering
• Imaging Technology

Background:

• Spatial heterodyne one-dimensional imaging spectrometers (SHIS) acquire hyperspectral data from multiple fields of view (FOVs) simultaneously.
• The dynamic range of conventional SHIS is constrained by detector limitations, hindering the detection of both strong and weak signals concurrently.

Purpose of the Study:

• To develop a high dynamic range spatial heterodyne one-dimensional imaging spectroscopy (HD-SHIS) system.
• To overcome the dynamic range limitations of existing SHIS technology.

Main Methods:

• Implementation of a digital micromirror device (DMD) within the SHIS architecture.
• Utilizing the DMD to control individual FOV signal exposure times by adjusting micromirror flip times.
• Employing Hadamard modulation of interference data in the spectral dimension via the DMD for spectral detection.

Main Results:

• Demonstrated a significant improvement in dynamic range.
• Achieved a 48 dB dynamic range enhancement using an 8-bit display width DMD.
• Successfully performed simultaneous detection of strong and weak signals in different FOVs.

Conclusions:

• The developed HD-SHIS system effectively expands the dynamic range of hyperspectral imaging.
• The DMD-based approach offers a practical solution for simultaneous detection of diverse signal intensities.
• HD-SHIS shows promise for applications requiring wide dynamic range hyperspectral measurements.