SPR sensors, SPR response for liquid and gas, Portable SPR sensor, 3D printer sensor
Abstract
The demand for sensors based on surface plasmon resonance (SPR) in field applications, with capabilities to operate with analysis of liquid and gaseous substances, has grown follow the evolution of optical-electronic instruments. The operation with both types of substances demands a wide angular range of optical components for resonance excitation, generally obtained by incorporating mobile components into the sensor, which eventually mitigates its portability. In response to this challenge, a portable RPS sensor was projected, with a design based on the use of general-purpose components, ensuring a rotation system with simple instrumentation. It has a modular mechanical structure, that can be manufactured using a 3D printer. A computational prototype was developed showing the capabilities of portability, movement (range of 35° to 75°), use of multiple prisms, and parts holding to excite the phenomenon. The proposed combination of materials presented sensitivity values of 150 ± 40 °/UIR for liquids and 60 ± 5 °/UIR for gases, demonstrating the feasibility of the proposed arrangement.
