Multi-substrate passive colorimetric sensors for detecting toxic industrial chemicals and chemical warfare agents
US11255794B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 22, 2019 |
| Grant date | Feb 22, 2022 |
| Priority date | — |
| Expiry date | Sep 23, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/7759
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed are systems and methods for the robust passive detection of airborne toxins using a colorimetric sensor coating onto a optically transparent substrate. In certain embodiments, the substrate is affixed to an adhesive material (tape). In certain embodiments, the sensor and substrate are transparent. In various embodiments, multiple sensors are coated onto selected substrate for the simultaneous detection of multiple toxins. In various embodiments, the sensed or detected toxins include a number of chemical warfare agents and toxic industrial chemicals. In various implementations, the tape is affixed to a remote surface, which may be visually monitored by a camera directly by focusing the camera on the tape or may be affixed to a camera lens by an adhesive backing, such that colorimetric sensor changes may be observed through the lens itself. Sensor claddings consist of optical grade polymers immobilized with colorimetric and/or fluorescent indicators that undergo optical changes upon exposure to their target analyte. Typical substrate cross-linked polymers are urethane acrylate polymer based, co-polymerized with silicone backbone such as dimethyl siloxane, which in general i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.