[A digital micromirror device-based Hadamard transform near infrared spectrometer]

Area of Science:

• Spectroscopy
• Optical Engineering
• Materials Science

Context:

• Traditional spectrometers often rely on mechanical components, limiting speed and stability.
• Near-infrared (NIR) spectroscopy is crucial for analyzing chemical compositions.
• Digital Micromirror Devices (DMDs) offer precise optical modulation capabilities.

Purpose:

• To develop and evaluate a Hadamard transform near-infrared spectrometer utilizing a DMD.
• To replace traditional mechanical Hadamard masks with a DMD for optical modulation.
• To assess the performance and suitability of the DMD-based spectrometer for specific applications.

Summary:

• A Hadamard transform near-infrared spectrometer was constructed using a digital micromirror device (DMD) for optical modulation instead of mechanical masks.
• The system employs fiber optics for signal collection, a grating for diffraction, and an InGaAs detector.
• Fast Hadamard transform algorithms were used to recover the original spectrum.
• Experimental results demonstrated high resolution, signal-to-noise ratio, stability, sensitivity, and rapid response.

Impact:

• The developed spectrometer exhibits significant advantages in performance metrics.
• Its high performance makes it highly suitable for demanding applications such as oil analysis and food safety testing.
• This technology offers a potential advancement in portable and rapid analytical instrumentation.