Microwave densitometer

Details Microwave densitometer Microwave densitometer

1995-09-06

1996-12-03

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324639, 324640, 73 6144, 73 6141, 7386108, G01R 2704, G01R 2732

Patent

active

055811914

ABSTRACT:
A microwave densitometer comprises a phase difference detecting section for detecting a phase difference between a microwave generated from a microwave generator and a microwave received by a microwave receiver, a rotation number updating section for varying a value of number of rotations "n", a correcting section for obtaining a difference value .DELTA..THETA. indicating a difference between a true phase difference .THETA..sub.2 and a reference phase difference .THETA..sub.1 ' a signal converter for converting the difference value .DELTA..THETA. to a concentration signal an operation mode setter for setting a operation mode, and a holding circuit for holding the number of rotations "n" and the apparent phase difference .THETA..sub.2 ' when a concentration measuring operation of the fluid to be measured is switched to a non-measuring operation in response to a change of the operation mode set to the operation mode setter.

REFERENCES:
patent: 3813924 (1974-06-01), Agar
patent: 5001067 (1991-03-01), Coleman et al.
patent: 5006785 (1991-04-01), Revus
patent: 5101163 (1992-03-01), Agar
patent: 5313168 (1994-05-01), Ogawa
patent: 5383353 (1995-01-01), Marrielli et al.
patent: 5502393 (1996-03-01), Yamaguchi et al.

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