Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-04-18
2006-04-18
Benson, Walter (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S694000
Reexamination Certificate
active
07030630
ABSTRACT:
In a method of determining air humidity, a capacitive moisture measuring element (2) used in a moisture sensor for calculation operations is modelled by a parallel circuit of an ideal capacitor (C) and an ohmic resistance (Rp). Charging and/or discharging of the capacitive moisture measuring element (2) by way of a first measuring resistor (R1;RA) provides for ascertaining a first time constant or a first period duration of the charging and/or discharging operation, and charging and/or discharging of the moisture measuring element (2) by way of a second measuring resistor (R2;RA//R) provides for ascertaining a second one. The capacitance (C) of the moisture measuring element (2) is then calculated from the two time constants or the two period durations, a value for the moisture level finally being ascertained from the capacitance. This method achieves a higher level of measuring accuracy on the part of the moisture sensor.
REFERENCES:
patent: 4945863 (1990-08-01), Schmitz et al.
patent: 5027077 (1991-06-01), Yanagisawa et al.
patent: 5792938 (1998-08-01), Gokhfeld
patent: 5844138 (1998-12-01), Cota
patent: 5922939 (1999-07-01), Cota
patent: 6724612 (2004-04-01), Davis et al.
patent: 2005/0212532 (2005-09-01), Bernhard
patent: 0 377 782 (1989-07-01), None
patent: 2 284 676 (1995-06-01), None
Chen, Zhi, Mao-Chang Jin and Chao Zhen, “Humidity Sensors With Reactively Evaporated Al2O3Films as Porous Dielectrics,” 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. 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).
Chen, Zhi, Mao-Chang Jin and Chao Zhen, “Humidity Sensors With Reactively Evaporated Al2O3Films as Porous Dielectrics, ” 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 ofApplied Physics, Jun. 15, 2000, (5 pages).
Denton Denice D., Maha A. Sa. Jaafar, Andrew R. K. Ralston, Choon Ngiap Ho, and I li Sen-gang, “The Long Term Reliability of a Switched-Capacitor Relative Humidity Sensor Systems, ” University of Wisconsin-Madison, (4 pages).
Haas Christoph
Lüthi Yves
Benson Walter
Maginot Moore & Beck
Siemens Building Technologies AG
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