Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-06-22
1996-01-09
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
331 65, 324685, G01R 2726
Patent
active
054831725
ABSTRACT:
A device is provided for measuring dielectric constant and conductance of a material such as massecuite, the device including a pair of electrodes which are switchably connected to a tank circuit which includes a variable frequency oscillator operating at radio frequencies, and two reference frequencies are measured with the electrodes disconnected from the oscillator and two measurement frequencies with the electrodes coupled to the oscillator tank circuit, the differences between the reference and measurement frequencies being used to compute the inductance and dielectric constant or composition of the material. The frequency is modified by not more than about 10 MHz and may be achieved either by switchably introducing additional inductance or capacitance into the tank circuit to modify its frequency or by having the electrodes switchable between a pair or oscillators operating at known radio frequencies.
REFERENCES:
patent: 3636470 (1972-01-01), Oliver et al.
patent: 4053849 (1977-10-01), Bower et al.
patent: 4426616 (1984-01-01), Maier
patent: 5034722 (1991-07-01), Premack
patent: 5119671 (1992-06-01), Kopera
patent: 5130672 (1992-07-01), Watkiss et al.
patent: 5198777 (1993-03-01), Masuda et al.
patent: 5261270 (1993-11-01), Gonze et al.
patent: 5291534 (1994-03-01), Sakurai et al.
By P. Neelakantaswamy et al., "Miniature-electrode probe for conductivity measurements on electrolytic solutions or colloidal sols of small sample sizes", 1983, vol. 16, No. 12, pp. 1189-1193, Great Britain.
LandOfFree
Radio frequency measuring apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radio frequency measuring apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio frequency measuring apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1304872