# High-Resolution Snapshot Multispectral Imaging System for Hazardous Gas Classification and Dispersion Quantification

## TL;DR

A new imaging system captures detailed spatial and spectral data to monitor and identify hazardous gas emissions in real time.

## Contribution

The HRSMIS system enables simultaneous high-resolution spatial and multispectral imaging for rapid gas classification and dispersion analysis.

## Key findings

- The HRSMIS system can detect up to 25 gas species in a single snapshot using a dual-path optical configuration.
- The system achieves MTF values of 0.40 in the high-resolution channel and 0.29 in the multispectral channel.
- Monte Carlo tolerance analysis confirms the system's stability for real-time gas plume visualization and concentration quantification.

## Abstract

Real-time monitoring of hazardous gas emissions in open environments remains a critical challenge. Conventional spectrometers and filter wheel systems acquire spectral and spatial information sequentially, which limits their ability to capture multiple gas species and dynamic dispersion patterns rapidly. A High-Resolution Snapshot Multispectral Imaging System (HRSMIS) is proposed to integrate high spatial fidelity with multispectral capability for near real-time plume visualization, gas species identification, and concentration retrieval. Operating across the 7–14 μm spectral range, the system employs a dual-path optical configuration in which a high-resolution imaging path and a multispectral snapshot path share a common telescope, allowing for the simultaneous acquisition of fine two-dimensional spatial morphology and comprehensive spectral fingerprint information. Within the multispectral path, two 5×5 microlens arrays (MLAs) combined with a corresponding narrowband filter array generate 25 distinct spectral channels, allowing concurrent detection of up to 25 gas species in a single snapshot. The high-resolution imaging path provides detailed spatial information, facilitating spatio-spectral super-resolution fusion for multispectral data without complex image registration. The HRSMIS demonstrates modulation transfer function (MTF) values of at least 0.40 in the high-resolution channel and 0.29 in the multispectral channel. Monte Carlo tolerance analysis confirms imaging stability, enabling the real-time visualization of gas plumes and the accurate quantification of dispersion dynamics and temporal concentration variations.