Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1992-11-06
1994-05-17
Tokar, Michael J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
73 6143, 324683, 324682, G01R 2726
Patent
active
053131681
ABSTRACT:
In a fuel dielectric constant detecting apparatus, a high frequency signal is applied to an element for subjecting the high frequency voltage signal to resonance corresponding to the dielectric constant of the fuel. A DC voltage is applied to the subjecting element so that the duty of the high frequency signal be 50%, and the high frequency signals are so controlled that the phase shift between the signals provided at both ends of the resistor be a predetermined value. Alternatively, in the apparatus, the high frequency signal applying member includes a high frequency signal applying section and a reference high frequency signal applying section. The frequencies to the subjecting element are so controlled that the phase shift between the high frequency signal at the connecting point of the resistor and the subjecting element and the reference high frequency signal be equal to a phase shift between the high frequency signal applied to the subjecting element through the resistor and the reference high frequency signal, and those frequencies thus controlled or amounts of control for determining the latter are utilized to detect the dielectric constant of the fuel.
REFERENCES:
patent: 3443218 (1969-05-01), Jaggers et al.
patent: 4228393 (1980-10-01), Pile
patent: 4272718 (1981-06-01), Kashinchi
patent: 4470300 (1984-09-01), Kobayashi
patent: 4629914 (1986-12-01), Okanobu
patent: 4675596 (1987-06-01), Smith
patent: 5014011 (1991-05-01), Colvin
patent: 5099202 (1992-03-01), Claydon et al.
patent: 5122678 (1992-06-01), Takeyama
Mitsubishi Denki & Kabushiki Kaisha
Regan Maura
Tokar Michael J.
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