Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-12-28
1998-07-21
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2505594, 7333501, G01N 1506
Patent
active
057838364
ABSTRACT:
An optical sensor apparatus for detecting a vapor of an organic solvent is characterized by a simple structure which allows easy manufacture, high reliability, low cost, compactness in size, and portability. The optical sensor apparatus has a light source unit which emits light for irradiating a polymer thin film formed on a flat reflecting substrate of a sensing element. Light reflected by the sensing element is detected by a light detecting unit. The light source unit, the sensing element, and the light detecting unit are integrally supported by a housing. The polymer thin film which comes into contact with a vapor of an organic solvent causes a change in the thickness and a reflective index thereof. This change is utilized to detect the existence and/or concentration of a vapor of an organic solvent.
REFERENCES:
patent: 5124172 (1992-06-01), Burrell et al.
patent: 5268145 (1993-12-01), Namba et al.
patent: 5308771 (1994-05-01), Zhou et al.
Sensors and Actuators, vol. B17, No. 3, Feb. 1, 1994, pp. 203-209 entitled "Development of a Prototype Gas Sensor using Surface Plasmon Resonance on Gratings", by M.J. Jory.
GIT Fachz. vol. 34, No. 7, pp. 889-893 entitled "Dunne Polymerfilme Als Sensoren Fur Kohlenwasserstoffe", by W. Nahm et al., Jan. 1990.
Arai Masayuki
Liu Yuan
Motosugi Kenji
Roth Christoph
Simmrock Hans-Ulrich
Hoechst Aktiengesellschaft
Le Que
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