A compact optical ethylene monitoring system

J. Wöllenstein; S. Hartwig; J. Hildenbrand; Andre Eberhardt; M. Moreno; J. Santander; R. Rubio; J. Fonollosa; L. Fonseca

doi:10.1117/12.721822

15 May 2007 A compact optical ethylene monitoring system

J. Wöllenstein, S. Hartwig, J. Hildenbrand, Andre Eberhardt, M. Moreno, J. Santander, R. Rubio, J. Fonollosa, L. Fonseca

Author Affiliations +

Proceedings Volume 6589, Smart Sensors, Actuators, and MEMS III; 658907 (2007) https://doi.org/10.1117/12.721822
Event: Microtechnologies for the New Millennium, 2007, Maspalomas, Gran Canaria, Spain

Abstract

In various fruit storage applications precise and continuous ethylene detection is needed. The aim of this work is the development of a miniaturised mid-infrared filter spectrometer for ethylene detection at 10.6 &mgr;m wavelength. For this reason optical components and signal processing electronics were developed, tested and integrated in a compact measurement system. The present article describes the optical components, the integration of the optical system, electronics and results of gas measurements. Next to a Silicon-based macroporous IR-emitter, a miniaturised absorption cell and a detector module for the simultaneous measurement at four channels for ethylene, two interfering gases and the reference signal were integrated in the optical system. Optical filters were attached to fourfold thermopile-arrays by flip-chip- technology. Silicon-based Fresnel multilenses were processed and attached to the cap of the detector housing. Because of the high reflection losses at the silicon-air surface the Fresnel lenses were coated with Antireflection layers made of Zinc sulphide. For the signal processing electronics a preamplification stage and a Lock-in-board has been developed. First ethylene measurements with the optical system with miniaturised gas cell, Silicon-based IR-emitter, a commercial thermopile detector and the self-developed system electronics showed a detection limit of smaller than 20ppm.

Citation Download Citation

J. Wöllenstein, S. Hartwig, J. Hildenbrand, Andre Eberhardt, M. Moreno, J. Santander, R. Rubio, J. Fonollosa, and L. Fonseca "A compact optical ethylene monitoring system", Proc. SPIE 6589, Smart Sensors, Actuators, and MEMS III, 658907 (15 May 2007); https://doi.org/10.1117/12.721822

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