Environmental sensor and method therefor

Details Environmental sensor and method therefor Environmental sensor and method therefor

1995-01-03

1996-02-06

Gonzalez, Frank

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356440, 422 8211, 385 12, 25022711, 250573, G01N 2100, G02B 600

Patent

active

054899885

ABSTRACT:
A sensor (10,30,40,50,70) for detecting chemicals and changes in the surrounding environment utilizes a sol-gel sensor element (14,16,17,54,56,57) containing a chemical indicator. Grooves (12,13,24,52,53) are formed in a substrate (11,51). The grooves are filled with a sol-gel material having a chemical indicator, and the sol-gel is cured to adhere to the substrate (11,51). The grooves (12,13,24,52,53) are formed to facilitate optically coupling a fiber optic cable (46) to the sol-gel sensor element. Light is coupled from the fiber optic cable (46) to the sol-gel sensor element (14,16,17,54,56,57).

REFERENCES:
patent: 3110816 (1963-11-01), Kaisler et al.
patent: 5300564 (1994-04-01), Avnir et al.
patent: 5314829 (1994-05-01), Coles
Ding et al., "Fibre Optic pH Sensors Prepared by Sol-Gel Immobilisation Technique" Electronic Letters, vol.27, No. 17, Aug. 15, 1991, pp. 1560-1562.
MacCraith eet al., "LED-Based Fiber Optic Oxygen Sensor Using Sol-Gel Coating", Electronics Letters, vol. 30, No. 11, May 26, 1994, pp. 888-889.

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