Methods and devices for standoff differential Raman spectroscopy with increased eye safety and decreased risk of explosion

US11300448B2 · kind B2 · utility

Assignee

• Pendar Technologies, LLC · US

Inventors

• Daryoosh Vakhshoori · Cambridge, US
• Romain Blanchard · Cambridge, US
• Peili Chen · Andover, US
• Masud Azimi · Nashua, US
• Tobias Mansuripur · Cambridge, US
• Kalyani Krishnamurthy · Lincoln, US
• Arran Bibby · Savannah, US
• Fred R. Huettig, III · Sudbury, US
• Gokhan Ulu · Newton, US
• Greg Vander Rhodes · Lexington, US

Key dates

• Filing date: Dec 22, 2020
• Grant date: Apr 12, 2022
• Expiry date: Dec 22, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/0071
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A compact, portable Raman spectrometer makes fast, sensitive standoff measurements at little to no risk of eye injury or igniting the materials being probed. This spectrometer uses differential Raman spectroscopy and ambient light measurements to measure point-and-shoot Raman signatures of dark or highly fluorescent materials at distances of 1 cm to 10 m or more. It scans the Raman pump beam(s) across the sample to reduce the risk of unduly heating or igniting the sample. Beam scanning also transforms the spectrometer into an instrument with a lower effective safety classification, reducing the risk of eye injury. The spectrometer's long standoff range automatic focusing make it easier to identify chemicals through clear and translucent obstacles, such as flow tubes, windows, and containers. And the spectrometer's components are light and small enough to be packaged in a handheld housing or housing suitable for a small robot to carry.