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- Hummelgard, Christine, et al.
(författare)
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Low-cost NDIR based sensor platform for sub-ppm gas detection
- 2015
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Ingår i: Urban Climate. - : Elsevier. - 2212-0955. ; 14, s. 342-350
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Tidskriftsartikel (refereegranskat)abstract
- We report on a new low-cost non-dispersive infrared (NDIR) based sensor platform for sub-ppm gas detection. The aim of the sensor platform development was to create a cost-effective, mass-producible and highly accurate device. Due to its sensitivity, the platform is well suitable for measuring and detecting gases like carbon dioxide, methane, dinitrogen oxide, ammonia, ethanol vapour, refrigerants, etc. The sensor is based on the White-cell NDIR approach and realizes a path length of 1.28 m in a device with an external length of less than 10 cm. High mechanical accuracy of the optical system, temperature controlled optics, highly stable electronics and an optimized mirror surfaces allow a detection level as low as 0.007 ppm.
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| 2. |
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| 3. |
- Schröder, Stephan, et al.
(författare)
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A large-area single-filament infrared emitter and its application in a spectroscopic ethanol gas sensing system
- 2021
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Ingår i: Microsystems and Nanoengineering. - : Springer Nature. - 2055-7434. ; 7:1
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Tidskriftsartikel (refereegranskat)abstract
- Nondispersive infrared (NDIR) spectroscopy is an important technology for highly accurate and maintenance-free sensing of gases, such as ethanol and carbon dioxide. However, NDIR spectroscopy systems are currently too expensive, e.g., for consumer and automotive applications, as the infrared (IR) emitter is a critical but costly component of these systems. Here, we report on a low-cost large-area IR emitter featuring a broadband emission spectrum suitable for small NDIR gas spectroscopy systems. The infrared emitter utilizes Joule heating of a Kanthal (FeCrAl) filament that is integrated in the base substrate using an automated high-speed wire bonding process, enabling simple and rapid formation of a long meander-shaped filament. We describe the critical infrared emitter characteristics, including the effective infrared emission spectrum, thermal frequency response, and power consumption. Finally, we integrate the emitter into a handheld breath alcohol analyzer and show its operation in both laboratory and real-world settings, thereby demonstrating the potential of the emitter for future low-cost optical gas sensor applications. © 2021, The Author(s).
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