Moisture sensor with capacitive moisture measuring element...

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C073S335040

Reexamination Certificate

active

07049829

ABSTRACT:
In a method of determining air humidity, a corrected moisture signal is calculated for a moisture signal (Hi) ascertained from electrical properties of a capacitive moisture measuring element. In a measuring phase (30) with rising relative air humidity (RH), the corrected moisture signal is the current moisture signal (Hi) increased by a correction value, whereas in a measuring phase (31) with falling relative air humidity (RH) the corrected moisture signal is the current moisture signal (Hi) reduced by a correction value. Depending on the respective properties of the moisture measuring element and the required degree of measuring accuracy, the correction value is constant or is taken into consideration in dependence on the relative air humidity RH. This method provides a higher level of measuring accuracy with a moisture sensor equipped with the moisture measuring element.

REFERENCES:
patent: 4945863 (1990-08-01), Schmitz et al.
patent: 5027077 (1991-06-01), Yanagisawa et al.
patent: 5485747 (1996-01-01), Antikainen et al.
patent: 5792938 (1998-08-01), Gokhfeld
patent: 5844138 (1998-12-01), Cota
patent: 5922939 (1999-07-01), Cota
patent: 6073480 (2000-06-01), Gokhfeld
patent: 6450026 (2002-09-01), Desarnaud
patent: 6724612 (2004-04-01), Davis et al.
patent: 6882165 (2005-04-01), Ogura
patent: 0 377 782 (1989-07-01), None
patent: 2 284 676 (1995-06-01), None
Lee et al, MEMS-based Humidity Sensors with Integrated Temperature Sensors for Signal Drift Compensation Sensors, 2003, Proceedings of IEEE, vol. 1, Oct. 22-24, 2003, pp. 384-388 vol. 1.
Chen, Zhi, Mao-Chang Jin and Chao Zhen, “Humidity Sensors With Reactively Evaporated Al2O3Films as Porous Dielelectrics,” Sensors and Actuators B Chemical, Aug. 1990, (5 pages).
Li, G. Q., P. T. Lai, M. Q. Huang, S. H. Zeng, B. Li and Y. C. Cheng, “A Humidity-Sensing Model for Metal-Insulator-Semiconductor Capacitors with Porous Ceramic Film,” Journal of Applied Physics, Jun. 15, 2000, (5 pages).
Denton, Denice D., Maha A. S. Jaafar, Andrew R. K. Ralston, Choon Ngiap Ho, and I Li Sen-gang, “The Long Term Reliability of a Switched-Capacitor Relative Humidity Sensor System,” University of Wisconsin-Madison, (4 pages).
Dokmeci, Mehmet and Khalil Najafi, “A High-Sensitivity Polyimide Capacitive Relative Humidity Sensor for Monitoring Anodically Bonded Hermetic Micropackages,” Journal of Microelectromechanical Systems, vol. 10, No. 2, Jun. 2, 2001, (8 pages).
Visscher, G. J. W. and J. G. Kornet, “Long-Term Tests of Capacitive Humidity Sensors,” Measurement Science & Technology, Oct. 1994, (9 pages).
Anchisini R., G. Faglia, M. C. Gallazzi, G. Sberveglieri, and G. Zerbi, “Polyphosphazene Membrane as a Very Sensitive Resistive and Capacitive Humidity Sensor,” Sensors and Actuators B Chemical, 1996 (4 pages).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Moisture sensor with capacitive moisture measuring element... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Moisture sensor with capacitive moisture measuring element..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Moisture sensor with capacitive moisture measuring element... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3616011

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.