Laser absorption spectroscopy sensor for O2 in hot, SO2-, SO3-, and pm-laden gases
This advanced laser absorption spectroscopy sensor is designed for measuring O2 in high-temperature, SO2-, SO3-, and particulate-laden environments. Utilizing tunable lasers and sapphire optics, it promises accurate O2 readings with robust anti-fouling measures.
Overview
The proposed solution is a cutting-edge laser absorption spectroscopy sensor specifically designed to measure oxygen (O2) concentrations in environments with high temperatures and challenging gas compositions, such as those containing sulfur dioxide (SO2), sulfur trioxide (SO3), and significant particulate matter (PM). This sensor leverages tunable laser absorption spectroscopy, targeting an O2 absorption feature near 760 nm, and incorporates sapphire windows for reliable optical access. It is engineered to overcome optical fouling through several strategies, including laser amplification, in-situ window cleaning, and buffer gas purges, ensuring sustained performance and accuracy.
Technical specifications
Key features:
- Utilizes tunable lasers amplified to 1-3 W for strong signal detection in noisy environments.
- Incorporates wavelength-modulation spectroscopy and extended absorption paths (via multiple reflections or scattering) to enhance sensitivity.
- Sapphire windows provide robust optical access, handling temperatures up to 1000 °C.
- Designed for cost-effective production, with each unit priced under $4,000 in volumes of 10 or more.
- Includes strategies for managing weak O2 absorption and mitigating noise from practical exhaust gas conditions.
Technology readiness level
The sensor currently stands at Technology Readiness Level 5, having undergone relevant validation in similar applications. Future plans include addressing constraints such as chemical compatibility and particulate build-up rates, followed by design optimization, demonstration, and preparation for commercial production.
About University of Wisconsin, Madison
The University of Wisconsin–Madison is the state’s flagship public research university, a comprehensive institution with a large research enterprise and broad disciplinary breadth. Industry engages through shared instrumentation, pilot‑scale testbeds, and co-located core facilities that support prototyping and scale-up. An affiliated research and technology park hosts startups and corporate R&D, while integration with a major hospital system enables clinical translation; a statewide extension network connects campus advances to companies and communities across Wisconsin. Research is sustained by competitive federal funding from agencies such as NIH, NSF, DOE, USDA, and DoD, alongside state and industry partnerships. Dedicated commercialization support—through an affiliated foundation and campus offices—provides IP management, licensing, startup mentoring, and flexible, industry-friendly agreements.
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